'use strict';
var FLIPBOOK = FLIPBOOK || {};
FLIPBOOK.version = '4.10.4';

// eslint-disable-next-line no-shadow-restricted-names
(function init(window, document, undefined) {
    if (typeof jQuery != 'undefined') {
        jQuery.fn.flipBook = function (options) {
            return new FLIPBOOK.Main(options, this);
        };

        jQuery.fn.swipeBook = function (options) {
            options.viewMode = 'swipe';
            return new FLIPBOOK.Main(options, this);
        };
    }

    window.FlipBook = function (el, options) {
        return new FLIPBOOK.Main(options, el);
    };
})(window, document);

FLIPBOOK.Main = class {
    static defaultOptions = {
        name: '',
        pages: [],
        tableOfContent: [],
        tableOfContentCloseOnClick: true,
        thumbsCloseOnClick: true,
        thumbsStyle: 'overlay', //overlay, side
        deeplinkingEnabled: false,
        deeplinkingPrefix: '',
        assets: {
            preloader: 'assets/images/preloader.jpg',
            flipMp3: 'assets/mp3/turnPage.mp3',
            spinner: 'assets/images/spinner.gif',
            backgroundMp3: 'assets/mp3/background.mp3',
        },
        pdfUrl: null,
        rangeChunkSize: 64,
        disableRange: false,
        disableStream: true,
        disableAutoFetch: true,
        pdfAutoLinks: false,
        htmlLayer: true,
        rightToLeft: false,
        startPage: 0,
        sound: true,
        backgroundColor: 'rgb(81, 85, 88)',
        backgroundImage: '',
        backgroundPattern: '',
        backgroundTransparent: false,
        thumbSize: 150,
        loadAllPages: false,
        loadPagesF: 2,
        loadPagesB: 1,
        autoplayOnStart: false,
        autoplayInterval: 3000,
        autoplayLoop: true,
        skin: '', // dark, light, gradient
        menuOverBook: false,
        menuFloating: false,
        menuBackground: '',
        menuShadow: '',
        menuMargin: 0,
        menuPadding: 0,
        menuTransparent: false,
        menu2OverBook: true,
        menu2Floating: false,
        menu2Background: '',
        menu2Shadow: '',
        menu2Margin: 0,
        menu2Padding: 0,
        menu2Transparent: true,
        accentColor: '#3b82f6',
        skinColor: '#222',
        skinColorHover: '#111',
        skinBackground: '#FFF',
        floatingBtnColor: '#FFF',
        floatingBtnBackground: '#00000055',
        btnColor: '',
        btnBackground: 'none',
        btnSize: 18,
        btnRadius: 2,
        btnMargin: 2,
        btnPaddingV: 10,
        btnPaddingH: 10,
        btnShadow: '',
        btnTextShadow: '',
        btnBorder: '',
        btnColorHover: '',
        btnBackgroundHover: '',
        arrowColor: '#FFF',
        arrowColorHover: '#FFF',
        arrowBackground: 'rgba(0, 0, 0, 0)',
        arrowBackgroundHover: 'rgba(0, 0, 0, .15)',
        arrowSize: 40,
        arrowRadius: 4,
        arrowMargin: 4,
        arrowPadding: 10,
        arrowTextShadow: '0px 0px 1px rgba(0, 0, 0, 1)',
        arrowBorder: '',
        floatingBtnColorHover: '',
        floatingBtnBackgroundHover: '',
        floatingBtnSize: null,
        floatingBtnRadius: null,
        floatingBtnMargin: null,
        floatingBtnPadding: null,
        floatingBtnShadow: '',
        floatingBtnTextShadow: '',
        floatingBtnBorder: '',
        btnOrder: [
            'currentPage',
            'progressBar',
            'btnFirst',
            'btnPrev',
            'btnNext',
            'btnLast',
            'btnZoomOut',
            'btnZoomIn',
            'btnThumbs',
            'btnToc',
            'btnShare',
            'btnPrint',
            'btnDownloadPdf',
            'btnSound',
            'btnTools',
            'btnSingle',
            'btnExpand',
            'btnClose',
        ],
        currentPage: {
            enabled: true,
            title: 'Current page',
            vAlign: 'top',
            hAlign: 'left',
            marginH: 0,
            marginV: 0,
            color: '',
            background: '',
        },
        progressBar: {
            enabled: true,
            // title: '',
            vAlign: 'bottom',
            // hAlign: 'left',
            // marginH: 0,
            // marginV: 0,
            height: 5,
            color: '',
            background: '',
        },
        search: {
            enabled: false,
        },
        btnFirst: {
            enabled: false,
            title: 'First page',
            svg: 'last',
            iconReverse: true,
        },
        btnPrev: {
            enabled: true,
            title: 'Previous page',
            svg: 'next',
            iconReverse: true,
        },
        btnNext: {
            enabled: true,
            title: 'Next page',
        },
        btnLast: {
            enabled: false,
            title: 'Last page',
        },
        btnZoomIn: {
            enabled: true,
            title: 'Zoom in',
            svg: 'plus',
        },
        btnZoomOut: {
            enabled: true,
            title: 'Zoom out',
            svg: 'minus',
        },
        btnRotateLeft: {
            enabled: false,
            title: 'Rotate left',
        },
        btnRotateRight: {
            enabled: false,
            title: 'Rotate right',
        },
        btnAutoplay: {
            enabled: true,
            title: 'Autoplay',
            svg: 'play',
            svgAlt: 'pause',
        },
        btnSearch: {
            enabled: false,
            title: 'Search',
        },
        btnBookmark: {
            enabled: true,
            title: 'Bookmarks',
        },
        btnNotes: {
            enabled: false,
            title: 'Notes',
        },
        btnToc: {
            enabled: true,
            title: 'Table of Contents',
            svg: 'list',
        },
        btnThumbs: {
            enabled: true,
            title: 'Pages',
        },
        btnShare: {
            enabled: true,
            title: 'Share',
        },
        btnPrint: {
            enabled: true,
            title: 'Print',
            toolsMenu: true,
        },
        btnDownloadPages: {
            enabled: true,
            title: 'Download',
            url: '',
            name: '',
            svg: 'download',
            toolsMenu: true,
        },
        btnDownloadPdf: {
            enabled: true,
            title: 'Download PDF',
            url: null,
            svg: 'pdf',
            toolsMenu: true,
        },
        btnSound: {
            enabled: true,
            title: 'Sound',
            svgAlt: 'mute',
            toolsMenu: true,
        },
        btnTools: {
            enabled: true,
            title: 'Tools',
        },
        btnExpand: {
            enabled: true,
            title: 'Toggle fullscreen',
            svgAlt: 'compress',
        },
        btnSingle: {
            enabled: true,
            title: 'Toggle single page',
            svgAlt: 'double',
            toolsMenu: true,
        },
        btnClose: {
            title: 'Close',
            hAlign: 'right',
            vAlign: 'top',
            size: 20,
        },
        sideNavigationButtons: true,
        hideMenu: false,
        shareUrl: null,
        shareTitle: null,
        shareImage: null,
        whatsapp: {
            enabled: true,
            title: 'WhatsApp',
        },
        twitter: {
            enabled: true,
            title: 'X (Twitter)',
        },
        facebook: {
            enabled: true,
            title: 'Facebook',
        },
        pinterest: {
            enabled: true,
            title: 'Pinterest',
        },
        email: {
            enabled: true,
            title: 'Email',
        },
        linkedin: {
            enabled: true,
            title: 'LinkedIn',
        },
        digg: {
            enabled: false,
            title: 'Digg',
        },
        reddit: {
            enabled: false,
            title: 'Reddit',
        },
        copyLink: {
            enabled: true,
        },
        pdf: {
            annotationLayer: false,
        },
        pageTextureSize: 3000,
        pageTextureSizeSmall: 1500,
        thumbTextureSize: 300,
        pageTextureSizeMobile: 1500,
        pageTextureSizeMobileSmall: 1000,
        pagesInMemory: 20,
        viewMode: 'webgl',
        singlePageMode: false,
        singlePageModeIfMobile: false,
        bookMargin: 20,
        zoomMin: 0.95,
        zoomMin2: 0.15,
        zoomMax2: null,
        zoomSize: null,
        zoomStep: 1.5,
        zoomTime: 300,
        zoomReset: false,
        zoomResetTime: 300,
        wheelDisabledNotFullscreen: false,
        arrowsDisabledNotFullscreen: false,
        arrowsAlwaysEnabledForNavigation: true,
        responsiveView: true,
        responsiveViewRatio: 1,
        responsiveViewTreshold: 768,
        minimalView: true,
        responsiveViewRatio: 1,
        minimalViewTreshold: 600,
        responsiveContainer: true,
        minPixelRatio: 1,
        pageFlipDuration: 1,
        contentOnStart: false,
        thumbnailsOnStart: false,
        searchOnStart: false,
        sideMenuOverBook: true,
        sideMenuOverMenu: false,
        sideMenuOverMenu2: true,
        sideMenuPosition: 'left',
        lightBox: false,
        lightBoxOpened: false,
        lightBoxFullscreen: false,
        lightboxResetOnOpen: true,
        lightboxBackground: null,
        lightboxBackgroundColor: null,
        lightboxBackgroundPattern: null,
        lightboxBackgroundImage: null,
        lightboxStartPage: null,
        lightboxMarginV: '0',
        lightboxMarginH: '0',
        lightboxCSS: '',
        lightboxPreload: false,
        lightboxShowMenu: false,
        lightboxCloseOnBack: true,
        lightboxFromStart: true,
        disableImageResize: true,
        pan: 0,
        panMax: 10,
        panMax2: 2,
        panMin: -10,
        panMin2: -2,
        tilt: 0,
        tiltMax: 0,
        tiltMax2: 0,
        tiltMin: 0,
        tiltMin2: -5,
        rotateCameraOnMouseMove: false,
        rotateCameraOnMouseDrag: true,
        lights: true,
        lightColor: 0xffffff,
        lightPositionX: 0,
        lightPositionY: 150,
        lightPositionZ: 1400,
        lightIntensity: 0.6,
        shadows: true,
        shadowMapSize: 1024,
        shadowOpacity: 0.3,
        pageRoughness: 1,
        pageMetalness: 0,
        pageHardness: 2,
        coverHardness: 2,
        pageSegmentsW: 10,
        pageSegmentsH: 1,
        pageMiddleShadowSize: 4,
        pageMiddleShadowColorL: '#7E7E7E',
        pageMiddleShadowColorR: '#AAAAAA',
        antialias: false,
        bitmapResizeHeight: null,
        bitmapResizeQuality: 'medium',
        preloaderText: '',
        fillPreloader: {
            enabled: false,
            imgEmpty: 'images/logo_light.png',
            imgFull: 'images/logo_dark.png',
        },
        logoImg: '',
        logoUrl: '',
        logoCSS: 'position:absolute;',
        logoHideOnMobile: false,
        printMenu: true,
        downloadMenu: true,
        cover: true,
        backCover: true,
        pdfTextLayer: true,
        textSelect: true,
        annotationLayer: true,
        googleAnalyticsTrackingCode: null,
        linkColor: 'rgba(0, 0, 0, 0)',
        linkColorHover: 'rgba(255, 255, 0, 1)',
        linkOpacity: 0.4,
        linkTarget: '_blank',
        rightClickEnabled: true,
        pageNumberOffset: 0,
        flipSound: true,
        backgroundMusic: false,
        doubleClickZoomDisabled: false,
        pageDragDisabled: false,
        pageClickAreaWdith: '10%',
        noteTypes: [
            { id: 1, title: 'User', color: 'green', enabled: true },
            { id: 2, title: 'Group', color: 'yellow', enabled: true },
            { id: 3, title: 'Admin', color: 'blue', enabled: true },
        ],
        pageRangeStart: null,
        pageRangeEnd: null,
        previewMode: {},
        strings: {
            print: 'Print',
            printLeftPage: 'Print left page',
            printRightPage: 'Print right page',
            printCurrentPage: 'Print current page',
            printAllPages: 'Print all pages',
            download: 'Download',
            downloadLeftPage: 'Download left page',
            downloadRightPage: 'Download right page',
            downloadCurrentPage: 'Download current page',
            downloadAllPages: 'Download all pages',
            bookmarks: 'Bookmarks',
            bookmarkLeftPage: 'Bookmark left page',
            bookmarkRightPage: 'Bookmark right page',
            bookmarkCurrentPage: 'Bookmark current page',
            search: 'Search',
            findInDocument: 'Find in document',
            pagesFoundContaining: 'pages found containing',
            noMatches: 'No matches',
            matchesFound: 'matches found',
            page: 'Page',
            matches: 'matches',
            match: 'match',
            thumbnails: 'Thumbnails',
            tableOfContent: 'Table of Contents',
            share: 'Share',
            notes: 'Notes',
            pressEscToClose: 'Press ESC to close',
            password: 'Password',
            addNote: 'Add note',
            typeInYourNote: 'Type in your note...',
            copyLink: 'Copy link',
            copied: 'Copied',
        },
        mobile: {
            shadows: false,
            pageSegmentsW: 5,
            btnAutoplay: { toolsMenu: true },
            btnBookmark: { toolsMenu: true },
            btnZoomIn: { enabled: false },
            btnZoomOut: { enabled: false },
            btnFirst: { enabled: false },
            btnLast: { enabled: false },
            currentPage: { enabled: false },
            pagesInMemory: 6,
            minimalViewTreshold: 360,
        },
    };
    static icons = {
        plus: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 448 512"><path d="M256 80c0-17.7-14.3-32-32-32s-32 14.3-32 32V224H48c-17.7 0-32 14.3-32 32s14.3 32 32 32H192V432c0 17.7 14.3 32 32 32s32-14.3 32-32V288H400c17.7 0 32-14.3 32-32s-14.3-32-32-32H256V80z"/></svg>',
        minus: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 448 512"><path d="M432 256c0 17.7-14.3 32-32 32L48 288c-17.7 0-32-14.3-32-32s14.3-32 32-32l352 0c17.7 0 32 14.3 32 32z"/></svg>',
        close: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 384 512"><path d="M342.6 150.6c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0L192 210.7 86.6 105.4c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3L146.7 256 41.4 361.4c-12.5 12.5-12.5 32.8 0 45.3s32.8 12.5 45.3 0L192 301.3 297.4 406.6c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3L237.3 256 342.6 150.6z"/></svg>',
        next: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 320 512"><path d="M278.6 233.4c12.5 12.5 12.5 32.8 0 45.3l-160 160c-12.5 12.5-32.8 12.5-45.3 0s-12.5-32.8 0-45.3L210.7 256 73.4 118.6c-12.5-12.5-12.5-32.8 0-45.3s32.8-12.5 45.3 0l160 160z"/></svg>',
        expand: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 448 512"><path d="M32 32C14.3 32 0 46.3 0 64v96c0 17.7 14.3 32 32 32s32-14.3 32-32V96h64c17.7 0 32-14.3 32-32s-14.3-32-32-32H32zM64 352c0-17.7-14.3-32-32-32s-32 14.3-32 32v96c0 17.7 14.3 32 32 32h96c17.7 0 32-14.3 32-32s-14.3-32-32-32H64V352zM320 32c-17.7 0-32 14.3-32 32s14.3 32 32 32h64v64c0 17.7 14.3 32 32 32s32-14.3 32-32V64c0-17.7-14.3-32-32-32H320zM448 352c0-17.7-14.3-32-32-32s-32 14.3-32 32v64H320c-17.7 0-32 14.3-32 32s14.3 32 32 32h96c17.7 0 32-14.3 32-32V352z"/></svg>',
        compress:
            '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 448 512"><path d="M160 64c0-17.7-14.3-32-32-32s-32 14.3-32 32v64H32c-17.7 0-32 14.3-32 32s14.3 32 32 32h96c17.7 0 32-14.3 32-32V64zM32 320c-17.7 0-32 14.3-32 32s14.3 32 32 32H96v64c0 17.7 14.3 32 32 32s32-14.3 32-32V352c0-17.7-14.3-32-32-32H32zM352 64c0-17.7-14.3-32-32-32s-32 14.3-32 32v96c0 17.7 14.3 32 32 32h96c17.7 0 32-14.3 32-32s-14.3-32-32-32H352V64zM320 320c-17.7 0-32 14.3-32 32v96c0 17.7 14.3 32 32 32s32-14.3 32-32V384h64c17.7 0 32-14.3 32-32s-14.3-32-32-32H320z"/></svg>',
        thumbs: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M448 96V224H288V96H448zm0 192V416H288V288H448zM224 224H64V96H224V224zM64 288H224V416H64V288zM64 32C28.7 32 0 60.7 0 96V416c0 35.3 28.7 64 64 64H448c35.3 0 64-28.7 64-64V96c0-35.3-28.7-64-64-64H64z"/></svg>',
        print: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M128 0C92.7 0 64 28.7 64 64v96h64V64H354.7L384 93.3V160h64V93.3c0-17-6.7-33.3-18.7-45.3L400 18.7C388 6.7 371.7 0 354.7 0H128zM384 352v32 64H128V384 368 352H384zm64 32h32c17.7 0 32-14.3 32-32V256c0-35.3-28.7-64-64-64H64c-35.3 0-64 28.7-64 64v96c0 17.7 14.3 32 32 32H64v64c0 35.3 28.7 64 64 64H384c35.3 0 64-28.7 64-64V384zM432 248a24 24 0 1 1 0 48 24 24 0 1 1 0-48z"/></svg>',
        sound: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 640 512"><path d="M533.6 32.5C598.5 85.3 640 165.8 640 256s-41.5 170.8-106.4 223.5c-10.3 8.4-25.4 6.8-33.8-3.5s-6.8-25.4 3.5-33.8C557.5 398.2 592 331.2 592 256s-34.5-142.2-88.7-186.3c-10.3-8.4-11.8-23.5-3.5-33.8s23.5-11.8 33.8-3.5zM473.1 107c43.2 35.2 70.9 88.9 70.9 149s-27.7 113.8-70.9 149c-10.3 8.4-25.4 6.8-33.8-3.5s-6.8-25.4 3.5-33.8C475.3 341.3 496 301.1 496 256s-20.7-85.3-53.2-111.8c-10.3-8.4-11.8-23.5-3.5-33.8s23.5-11.8 33.8-3.5zm-60.5 74.5C434.1 199.1 448 225.9 448 256s-13.9 56.9-35.4 74.5c-10.3 8.4-25.4 6.8-33.8-3.5s-6.8-25.4 3.5-33.8C393.1 284.4 400 271 400 256s-6.9-28.4-17.7-37.3c-10.3-8.4-11.8-23.5-3.5-33.8s23.5-11.8 33.8-3.5zM301.1 34.8C312.6 40 320 51.4 320 64V448c0 12.6-7.4 24-18.9 29.2s-25 3.1-34.4-5.3L131.8 352H64c-35.3 0-64-28.7-64-64V224c0-35.3 28.7-64 64-64h67.8L266.7 40.1c9.4-8.4 22.9-10.4 34.4-5.3z"/></svg>',
        mute: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 576 512"><path d="M301.1 34.8C312.6 40 320 51.4 320 64V448c0 12.6-7.4 24-18.9 29.2s-25 3.1-34.4-5.3L131.8 352H64c-35.3 0-64-28.7-64-64V224c0-35.3 28.7-64 64-64h67.8L266.7 40.1c9.4-8.4 22.9-10.4 34.4-5.3zM425 167l55 55 55-55c9.4-9.4 24.6-9.4 33.9 0s9.4 24.6 0 33.9l-55 55 55 55c9.4 9.4 9.4 24.6 0 33.9s-24.6 9.4-33.9 0l-55-55-55 55c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l55-55-55-55c-9.4-9.4-9.4-24.6 0-33.9s24.6-9.4 33.9 0z"/></svg>',
        share: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 448 512"><path d="M352 224c53 0 96-43 96-96s-43-96-96-96s-96 43-96 96c0 4 .2 8 .7 11.9l-94.1 47C145.4 170.2 121.9 160 96 160c-53 0-96 43-96 96s43 96 96 96c25.9 0 49.4-10.2 66.6-26.9l94.1 47c-.5 3.9-.7 7.8-.7 11.9c0 53 43 96 96 96s96-43 96-96s-43-96-96-96c-25.9 0-49.4 10.2-66.6 26.9l-94.1-47c.5-3.9 .7-7.8 .7-11.9s-.2-8-.7-11.9l94.1-47C302.6 213.8 326.1 224 352 224z"/></svg>',
        facebook:
            '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 320 512"><path d="M279.14 288l14.22-92.66h-88.91v-60.13c0-25.35 12.42-50.06 52.24-50.06h40.42V6.26S260.43 0 225.36 0c-73.22 0-121.08 44.38-121.08 124.72v70.62H22.89V288h81.39v224h100.17V288z"/></svg>',
        twitter:
            '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z"/></svg>',
        list: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M24 56c0-13.3 10.7-24 24-24H80c13.3 0 24 10.7 24 24V176h16c13.3 0 24 10.7 24 24s-10.7 24-24 24H40c-13.3 0-24-10.7-24-24s10.7-24 24-24H56V80H48C34.7 80 24 69.3 24 56zM86.7 341.2c-6.5-7.4-18.3-6.9-24 1.2L51.5 357.9c-7.7 10.8-22.7 13.3-33.5 5.6s-13.3-22.7-5.6-33.5l11.1-15.6c23.7-33.2 72.3-35.6 99.2-4.9c21.3 24.4 20.8 60.9-1.1 84.7L86.8 432H120c13.3 0 24 10.7 24 24s-10.7 24-24 24H32c-9.5 0-18.2-5.6-22-14.4s-2.1-18.9 4.3-25.9l72-78c5.3-5.8 5.4-14.6 .3-20.5zM224 64H480c17.7 0 32 14.3 32 32s-14.3 32-32 32H224c-17.7 0-32-14.3-32-32s14.3-32 32-32zm0 160H480c17.7 0 32 14.3 32 32s-14.3 32-32 32H224c-17.7 0-32-14.3-32-32s14.3-32 32-32zm0 160H480c17.7 0 32 14.3 32 32s-14.3 32-32 32H224c-17.7 0-32-14.3-32-32s14.3-32 32-32z"/></svg>',
        pdf: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M64 464l48 0 0 48-48 0c-35.3 0-64-28.7-64-64L0 64C0 28.7 28.7 0 64 0L229.5 0c17 0 33.3 6.7 45.3 18.7l90.5 90.5c12 12 18.7 28.3 18.7 45.3L384 304l-48 0 0-144-80 0c-17.7 0-32-14.3-32-32l0-80L64 48c-8.8 0-16 7.2-16 16l0 384c0 8.8 7.2 16 16 16zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z"/></svg>',
        tools: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 128 512"><path d="M64 360a56 56 0 1 0 0 112 56 56 0 1 0 0-112zm0-160a56 56 0 1 0 0 112 56 56 0 1 0 0-112zM120 96A56 56 0 1 0 8 96a56 56 0 1 0 112 0z"/></svg>',
        linkedin:
            '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 448 512"><path d="M100.28 448H7.4V148.9h92.88zM53.79 108.1C24.09 108.1 0 83.5 0 53.8a53.79 53.79 0 0 1 107.58 0c0 29.7-24.1 54.3-53.79 54.3zM447.9 448h-92.68V302.4c0-34.7-.7-79.2-48.29-79.2-48.29 0-55.69 37.7-55.69 76.7V448h-92.78V148.9h89.08v40.8h1.3c12.4-23.5 42.69-48.3 87.88-48.3 94 0 111.28 61.9 111.28 142.3V448z"/></svg>',
        whatsapp:
            '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 448 512"><path d="M380.9 97.1C339 55.1 283.2 32 223.9 32c-122.4 0-222 99.6-222 222 0 39.1 10.2 77.3 29.6 111L0 480l117.7-30.9c32.4 17.7 68.9 27 106.1 27h.1c122.3 0 224.1-99.6 224.1-222 0-59.3-25.2-115-67.1-157zm-157 341.6c-33.2 0-65.7-8.9-94-25.7l-6.7-4-69.8 18.3L72 359.2l-4.4-7c-18.5-29.4-28.2-63.3-28.2-98.2 0-101.7 82.8-184.5 184.6-184.5 49.3 0 95.6 19.2 130.4 54.1 34.8 34.9 56.2 81.2 56.1 130.5 0 101.8-84.9 184.6-186.6 184.6zm101.2-138.2c-5.5-2.8-32.8-16.2-37.9-18-5.1-1.9-8.8-2.8-12.5 2.8-3.7 5.6-14.3 18-17.6 21.8-3.2 3.7-6.5 4.2-12 1.4-32.6-16.3-54-29.1-75.5-66-5.7-9.8 5.7-9.1 16.3-30.3 1.8-3.7.9-6.9-.5-9.7-1.4-2.8-12.5-30.1-17.1-41.2-4.5-10.8-9.1-9.3-12.5-9.5-3.2-.2-6.9-.2-10.6-.2-3.7 0-9.7 1.4-14.8 6.9-5.1 5.6-19.4 19-19.4 46.3 0 27.3 19.9 53.7 22.6 57.4 2.8 3.7 39.1 59.7 94.8 83.8 35.2 15.2 49 16.5 66.6 13.9 10.7-1.6 32.8-13.4 37.4-26.4 4.6-13 4.6-24.1 3.2-26.4-1.3-2.5-5-3.9-10.5-6.6z"/></svg>',
        pinterest:
            '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 384 512"><path d="M204 6.5C101.4 6.5 0 74.9 0 185.6 0 256 39.6 296 63.6 296c9.9 0 15.6-27.6 15.6-35.4 0-9.3-23.7-29.1-23.7-67.8 0-80.4 61.2-137.4 140.4-137.4 68.1 0 118.5 38.7 118.5 109.8 0 53.1-21.3 152.7-90.3 152.7-24.9 0-46.2-18-46.2-43.8 0-37.8 26.4-74.4 26.4-113.4 0-66.2-93.9-54.2-93.9 25.8 0 16.8 2.1 35.4 9.6 50.7-13.8 59.4-42 147.9-42 209.1 0 18.9 2.7 37.5 4.5 56.4 3.4 3.8 1.7 3.4 6.9 1.5 50.4-69 48.6-82.5 71.4-172.8 12.3 23.4 44.1 36 69.3 36 106.2 0 153.9-103.5 153.9-196.8C384 71.3 298.2 6.5 204 6.5z"/></svg>',
        email: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M64 112c-8.8 0-16 7.2-16 16v22.1L220.5 291.7c20.7 17 50.4 17 71.1 0L464 150.1V128c0-8.8-7.2-16-16-16H64zM48 212.2V384c0 8.8 7.2 16 16 16H448c8.8 0 16-7.2 16-16V212.2L322 328.8c-38.4 31.5-93.7 31.5-132 0L48 212.2zM0 128C0 92.7 28.7 64 64 64H448c35.3 0 64 28.7 64 64V384c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V128z"/></svg>',
        digg: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M81.7 172.3H0v174.4h132.7V96h-51v76.3zm0 133.4H50.9v-92.3h30.8v92.3zm297.2-133.4v174.4h81.8v28.5h-81.8V416H512V172.3H378.9zm81.8 133.4h-30.8v-92.3h30.8v92.3zm-235.6 41h82.1v28.5h-82.1V416h133.3V172.3H225.1v174.4zm51.2-133.3h30.8v92.3h-30.8v-92.3zM153.3 96h51.3v51h-51.3V96zm0 76.3h51.3v174.4h-51.3V172.3z"/></svg>',
        reddit: '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 512 512"><path d="M440.3 203.5c-15 0-28.2 6.2-37.9 15.9-35.7-24.7-83.8-40.6-137.1-42.3L293 52.3l88.2 19.8c0 21.6 17.6 39.2 39.2 39.2 22 0 39.7-18.1 39.7-39.7s-17.6-39.7-39.7-39.7c-15.4 0-28.7 9.3-35.3 22l-97.4-21.6c-4.9-1.3-9.7 2.2-11 7.1L246.3 177c-52.9 2.2-100.5 18.1-136.3 42.8-9.7-10.1-23.4-16.3-38.4-16.3-55.6 0-73.8 74.6-22.9 100.1-1.8 7.9-2.6 16.3-2.6 24.7 0 83.8 94.4 151.7 210.3 151.7 116.4 0 210.8-67.9 210.8-151.7 0-8.4-.9-17.2-3.1-25.1 49.9-25.6 31.5-99.7-23.8-99.7zM129.4 308.9c0-22 17.6-39.7 39.7-39.7 21.6 0 39.2 17.6 39.2 39.7 0 21.6-17.6 39.2-39.2 39.2-22 .1-39.7-17.6-39.7-39.2zm214.3 93.5c-36.4 36.4-139.1 36.4-175.5 0-4-3.5-4-9.7 0-13.7 3.5-3.5 9.7-3.5 13.2 0 27.8 28.5 120 29 149 0 3.5-3.5 9.7-3.5 13.2 0 4.1 4 4.1 10.2.1 13.7zm-.8-54.2c-21.6 0-39.2-17.6-39.2-39.2 0-22 17.6-39.7 39.2-39.7 22 0 39.7 17.6 39.7 39.7-.1 21.5-17.7 39.2-39.7 39.2z"/></svg>',
        copyLink:
            '<svg xmlns="http://www.w3.org/2000/svg" height="1em" viewBox="0 0 640 512"><path d="M579.8 267.7c56.5-56.5 56.5-148 0-204.5c-50-50-128.8-56.5-186.3-15.4l-1.6 1.1c-14.4 10.3-17.7 30.3-7.4 44.6s30.3 17.7 44.6 7.4l1.6-1.1c32.1-22.9 76-19.3 103.8 8.6c31.5 31.5 31.5 82.5 0 114L422.3 334.8c-31.5 31.5-82.5 31.5-114 0c-27.9-27.9-31.5-71.8-8.6-103.8l1.1-1.6c10.3-14.4 6.9-34.4-7.4-44.6s-34.4-6.9-44.6 7.4l-1.1 1.6C206.5 251.2 213 330 263 380c56.5 56.5 148 56.5 204.5 0L579.8 267.7zM60.2 244.3c-56.5 56.5-56.5 148 0 204.5c50 50 128.8 56.5 186.3 15.4l1.6-1.1c14.4-10.3 17.7-30.3 7.4-44.6s-30.3-17.7-44.6-7.4l-1.6 1.1c-32.1 22.9-76 19.3-103.8-8.6C74 372 74 321 105.5 289.5L217.7 177.2c31.5-31.5 82.5-31.5 114 0c27.9 27.9 31.5 71.8 8.6 103.9l-1.1 1.6c-10.3 14.4-6.9 34.4 7.4 44.6s34.4 6.9 44.6-7.4l1.1-1.6C433.5 260.8 427 182 377 132c-56.5-56.5-148-56.5-204.5 0L60.2 244.3z"/></svg>',
    };
    constructor(options, elem) {
        if (elem.length) {
            this.elem = elem[0];
            this.elements = Array.from(elem);
        } else {
            this.elem = elem;
            this.elements = [elem];
        }

        function webgl_detect() {
            const canvas = document.createElement('canvas');
            const gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
            return gl instanceof WebGLRenderingContext;
        }

        if (typeof FLIPBOOK.hasWebGl == 'undefined') {
            FLIPBOOK.hasWebGl = webgl_detect();
        }

        this.hasWebGl = FLIPBOOK.hasWebGl;

        this.thumbsShowing = false;
        this.bookmarkShowing = false;
        this.searchingString = false;
        this.tocShowing = false;
        this.menuShowing = true;
        this.fullscreenActive = false;

        const layouts = {
            2: {
                currentPage: { vAlign: 'bottom', hAlign: 'center' },
                btnAutoplay: { hAlign: 'right', vAlign: 'top' },
                btnSound: { hAlign: 'right', vAlign: 'top' },
                btnSingle: { hAlign: 'right', vAlign: 'top' },
                btnExpand: { hAlign: 'right', vAlign: 'top' },
                btnSearch: { hAlign: 'left', vAlign: 'top' },
                btnBookmark: { hAlign: 'left', vAlign: 'top' },
                btnToc: { hAlign: 'left', vAlign: 'top' },
                btnThumbs: { hAlign: 'left', vAlign: 'top' },
                btnShare: { hAlign: 'right', vAlign: 'top' },
                btnPrint: { hAlign: 'right', vAlign: 'top' },
                btnDownloadPages: { hAlign: 'right', vAlign: 'top' },
                btnDownloadPdf: { hAlign: 'right', vAlign: 'top' },
                btnTools: { hAlign: 'right', vAlign: 'top' },
                menuTransparent: true,
            },
            3: {
                menuTransparent: true,
                menu2Transparent: false,
                menu2OverBook: false,
                menu2Padding: 5,
                btnMargin: 5,
                currentPage: { vAlign: 'top', hAlign: 'center' },
                btnPrint: { vAlign: 'top', hAlign: 'right' },
                btnDownloadPdf: { vAlign: 'top', hAlign: 'right' },
                btnDownloadPages: { vAlign: 'top', hAlign: 'right' },
                btnThumbs: { vAlign: 'top', hAlign: 'left' },
                btnToc: { vAlign: 'top', hAlign: 'left' },
                btnBookmark: { vAlign: 'top', hAlign: 'left' },
                btnSearch: { vAlign: 'top', hAlign: 'left' },
                btnShare: { vAlign: 'top', hAlign: 'right' },
                btnAutoplay: { vAlign: 'top', hAlign: 'right' },
                btnSingle: { vAlign: 'top', hAlign: 'right' },
                btnExpand: { vAlign: 'top', hAlign: 'right' },
                btnZoomIn: { hAlign: 'right' },
                btnZoomOut: { hAlign: 'right' },
                btnSound: { vAlign: 'top', hAlign: 'right' },
                btnTools: { vAlign: 'top', hAlign: 'right' },
                menuPadding: 5,
            },
            4: {
                menu2Transparent: false,
                menu2OverBook: false,
                sideMenuOverMenu2: false,
                currentPage: { vAlign: 'top', hAlign: 'center' },
                btnAutoplay: { vAlign: 'top', hAlign: 'left' },
                btnSound: { vAlign: 'top', hAlign: 'left' },
                btnSingle: { vAlign: 'top', hAlign: 'right' },
                btnExpand: { vAlign: 'top', hAlign: 'right' },
                btnZoomIn: { vAlign: 'top' },
                btnZoomOut: { vAlign: 'top' },
                btnSearch: { vAlign: 'top', hAlign: 'left' },
                btnBookmark: { vAlign: 'top', hAlign: 'left' },
                btnToc: { vAlign: 'top', hAlign: 'left' },
                btnThumbs: { vAlign: 'top', hAlign: 'left' },
                btnShare: { vAlign: 'top', hAlign: 'right' },
                btnPrint: { vAlign: 'top', hAlign: 'right' },
                btnDownloadPages: { vAlign: 'top', hAlign: 'right' },
                btnDownloadPdf: { vAlign: 'top', hAlign: 'right' },
                btnTools: { vAlign: 'top', hAlign: 'right' },
            },
        };

        const skins = {
            dark: {
                skinColor: '#EEE',
                btnColorHover: '#FFF',
                skinBackground: '#313538',
            },
            gradient: {
                skinColor: '#EEE',
                btnColor: '#EEE',
                btnColorHover: '#FFF',
                skinBackground: 'rgba(0,0,0,.7)',
                menuOverBook: true,
                menu2OverBook: true,
                sideMenuOverMenu: true,
                sideMenuOverMenu2: true,
                menuBackground: 'linear-gradient(to top, rgba(0, 0, 0, 0.65) 0%, transparent 100%)',
                menu2Background: 'linear-gradient(to bottom, rgba(0, 0, 0, 0.65) 0%, transparent 100%)',
            },
        };

        if (options.skin && skins[options.skin]) {
            options = FLIPBOOK.extend(true, {}, options, skins[options.skin]);
        }
        if (options.layout && layouts[options.layout]) {
            options = FLIPBOOK.extend(true, {}, options, layouts[options.layout]);
        }

        this.options = FLIPBOOK.extend(true, {}, FLIPBOOK.Main.defaultOptions, options);

        FLIPBOOK.count = FLIPBOOK.count || 0;
        FLIPBOOK.count++;

        this.uniqueID = FLIPBOOK.count;

        this.options.isMobile =
            /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ||
            (navigator.maxTouchPoints && navigator.maxTouchPoints > 2 && /MacIntel/.test(navigator.platform));

        if (this.options.isMobile) {
            FLIPBOOK.extend(true, this.options, this.options.mobile);
        }

        this.initOptions(this.options);
    }

    initOptions(o) {
        const self = this;
        this.strings = o.strings;
        o.pageShininess = o.pageShininess / 2;
        this.s = 0;

        // o.i = w !== parent;

        if (o.isMobile) {
            o.singlePageMode = o.singlePageModeIfMobile ? true : o.singlePageMode;

            if (o.viewModeMobile) {
                o.viewMode = o.viewModeMobile;
            }

            if (o.pageTextureSizeMobile) {
                o.pageTextureSize = o.pageTextureSizeMobile;
            }

            if (o.pageTextureSizeMobileSmall) {
                o.pageTextureSizeSmall = o.pageTextureSizeMobileSmall;
            }
        }

        
        var c = { a: 5, b: 7, c: 2 };
            o.pageTextureSize = Math.pow(c.a * c.b + c.c, c.c);
            o.pageTextureSizeSmall = Math.pow(c.a * c.b + c.c, c.c);
            o.zoomSize = Math.pow(c.b * c.a + c.c, c.c);
            

        if (o.viewMode == '3dSinglePage') {
            o.singlePageMode = true;
        }
        if (o.viewMode == '2dSinglePage') {
            o.singlePageMode = true;
            o.viewMode = '2d';
        }

        if (o.singlePageMode) {
            if (o.viewMode != '2d' && o.viewMode != 'swipe') {
                o.viewMode = '3d';
            }

            if (o.rightToLeft) {
                o.viewMode = 'swipe';
            }

            o.cover = true;
        }

        if (o.singlePageMode && o.viewMode == '3d') {
            o.rightToLeft = false;
        }

        if (o.viewMode == 'simple') {
            o.viewMode = '3d';
            o.instantFlip = true;
        }

        if (!o.cover) {
            o.responsiveView = false;
        }

        if (o.webgl) {
            var c = { a: 5, b: 6, c: 2 };
            o.pageTextureSize = Math.pow(c.a * c.b - c.c, c.c);
            o.pageTextureSizeSmall = Math.pow(c.a * c.b - c.c, c.c);
            o.zoomSize = Math.pow(c.b * c.a + c.a, c.c);
        }

        Object.assign(o, { e: 'toString', f: 'padStart', g: 'decodeURIComponent', h: 97, i: 16 });

        o.sideMenuPosition = o.rightToLeft ? 'right' : 'left';

        if (o.viewMode == 'webgl') {
            if (!this.hasWebGl) {
                o.viewMode = '3d';
            }
        }

        if (o.viewMode == 'webgl' || o.viewMode == 'scroll' || o.viewMode == 'swipe' || o.rightToLeft)
            o.btnSingle.enabled = false;

        this.webgl = o.viewMode == 'webgl';

        if (o.menuFloating) {
            o.menuOverBook = true;
            o.sideMenuOverMenu = true;
        }

        if (o.menu2Floating) {
            o.menu2OverBook = true;
            o.sideMenuOverMenu2 = true;
        }

        if (o.menuTransparent) {
            o.menuOverBook = true;
            o.sideMenuOverMenu = true;
            o.menuBackground = 'none';
        }

        if (o.menu2Transparent) {
            o.menu2OverBook = true;
            o.sideMenuOverMenu2 = true;
            o.menu2Background = 'none';
        } else {
            o.sideMenuOverMenu2 = false;
        }

        if (o.menuOverBook) {
            o.sideMenuOverMenu = true;
        }

        if (o.menu2OverBook) {
            o.sideMenuOverMenu2 = true;
        }

        o.pdfMode = Boolean(o.pdfUrl || o.pdfBase64);

        if (o.backgroundTransparent) {
            o.backgroundColor = 'none';
        }

        function parseAspectRatio(ratio) {
            if (ratio === undefined) {
                return;
            }
            if (typeof ratio === 'number') {
                return ratio;
            }

            ratio = String(ratio).trim().replace('/', ':');
            if (ratio.includes(':')) {
                const parts = ratio.split(':');
                const width = parseFloat(parts[0]);
                const height = parseFloat(parts[1]);
                return width / height;
            }

            return parseFloat(ratio);
        }

        this.options.containerRatio = parseAspectRatio(this.options.containerRatio);

        this.wrapper = document.createElement('div');
        this.wrapper.classList.add('flipbook-main-wrapper');

        let themes = {
            light: {
                color: '#222',
                bg: '#fff',
            },
            dark: {
                color: 'rgba(255, 255, 255, 0.75)',
                bg: 'rgb(49, 53, 56)',
            },
            gradient: {
                color: '#eee',
                bg: 'rgba(30,30,30,.8)',
            },
            twilight: {
                color: '#feffd3',
                bg: '#141414',
            },
            darkGrey: {
                color: '#9e9e9e',
                bg: '#212121',
            },
            lightGrey: {
                color: '#757575',
                bg: '#e0e0e0',
            },
        };
        let colors = {};
        if (o.skinColor) colors.color = o.skinColor;
        if (o.skinBackground) colors.bg = o.skinBackground;

        if (o.skin) Object.assign(colors, themes[o.skin]);

        this.wrapper.style.setProperty('--flipbook-bg', colors.bg);
        this.wrapper.style.setProperty('--flipbook-color', colors.color);
        this.wrapper.style.setProperty('--flipbook-accent-color', o.accentColor);

        this.tooltip2 = new FLIPBOOK.Tooltip2(this.wrapper);

        if (o.backgroundColor !== '') {
            this.wrapper.style.background = o.backgroundColor;
        }

        if (o.backgroundPattern !== '') {
            this.wrapper.style.background = `url(${o.backgroundPattern}) repeat`;
        }

        if (o.backgroundImage !== '') {
            this.wrapper.style.background = `url(${o.backgroundImage}) no-repeat`;
            this.wrapper.style.backgroundSize = 'cover';
            this.wrapper.style.backgroundPosition = 'center center';
        }

        this.bookLayer = document.createElement('div');
        this.bookLayer.classList.add('flipbook-bookLayer');
        this.wrapper.appendChild(this.bookLayer);
        if (o.pageDragDisabled) this.bookLayer.style.cursor = 'auto';

        if (o.linkTarget === 'spotlight') {
            this.bookLayer.addEventListener('click', (e) => {
                if (e.target.tagName.toLowerCase() === 'a') {
                    e.preventDefault();
                    this.spotlight(e.target.href);
                }
            });
        }

        if (!o.rightClickEnabled) {
            this.bookLayer.addEventListener('contextmenu', function (e) {
                e.preventDefault();
            });
        }

        if (o.hideMenu) {
            this.bookLayer.style.bottom = '0';
            o.menuOverBook = true;
        }

        o.pagesOriginal = JSON.parse(JSON.stringify(o.pages));

        this.book = document.createElement('div');
        this.book.classList.add('book');
        this.bookLayer.appendChild(this.book);

        if (o.preloader && typeof jQuery != 'undefined') {
            this.preloader = jQuery(o.preloader);
        } else {
            this.preloader = document.createElement('div');
            this.preloader.classList.add('flipbook-preloader', 'cssload-container');

            var speedingWheel = document.createElement('div');
            speedingWheel.classList.add('cssload-speeding-wheel');
            this.preloader.appendChild(speedingWheel);

            var loadingText = document.createElement('div');
            loadingText.classList.add('flipbook-loading-text');
            loadingText.textContent = o.preloaderText;
            this.preloader.appendChild(loadingText);

            var loadingBg = document.createElement('div');
            loadingBg.classList.add('flipbook-loading-bg');
            this.preloader.appendChild(loadingBg);
        }

        this.setLoadingProgress(0);

        async function preload() {
            if (o.pdfMode) {
                await self.loadScript(FLIPBOOK.pdfjsSrc, 'pdfjsLib');
                await self.loadScript(FLIPBOOK.pdfServiceSrc, 'FLIPBOOK.PdfService');

                if (o.btnSearch.enabled || o.btnNotes.enabled || o.search.enabled) {
                    await self.loadScript(FLIPBOOK.markSrc, 'Mark');
                }
            }
            if (o.viewMode == 'webgl') {
                await self.loadScript(FLIPBOOK.threejsSrc, 'THREE');
            } else {
                await self.loadScript(FLIPBOOK.iscrollSrc, 'IScroll');
            }
        }

        this.dispose = function () {
            this.disposed = true;
        };

        o.main = this;

        this._events = {};

        this.on = function (type, fn) {
            if (!this._events[type]) {
                this._events[type] = [];
            }

            this._events[type].push(fn);
        };

        this.off = function (type, fn) {
            if (!this._events[type]) {
                return;
            }

            var index = this._events[type].indexOf(fn);

            if (index > -1) {
                this._events[type].splice(index, 1);
            }
        };

        this.trigger = function (type) {
            if (!this._events[type]) {
                return;
            }

            var i = 0;
            var l = this._events[type].length;

            if (!l) {
                return;
            }

            for (; i < l; i++) {
                this._events[type][i].apply(this, [].slice.call(arguments, 1));
            }
        };

        this.on('textlayerrendered', function (_) {
            if (self.searchingString) {
                self.mark(self.searchingString);
            }
        });

        this.on('showpagehtml', function () {
            this.deselectText();
            if (self.searchingString) {
                self.mark(self.searchingString);
            }
        });

        this.addPageNotes = function (page) {
            if (this.noteService) {
                this.noteService.initPageNotes(page);
            }
        };

        this.on('pdfinit', async function () {
            o.tableOfContent = self.pdfService.outline || o.tableOfContent;
            o.doublePage = self.pdfService.double;
            if (o.scaleCover) {
                o.doublePage = true;
                o.responsiveView = false;
            }
            o.backCover = self.pdfService.backCover;

            self.viewportOriginal = self.pdfService.viewports[0];

            o.firstPage = {
                width: self.pdfService.viewports[0].width,
                height: self.pdfService.viewports[0].height,
                ratio: self.pdfService.viewports[0].width / self.pdfService.viewports[0].height,
            };

            if (self.pdfService.numPages > 1) {
                o.secondPage = {
                    width: self.pdfService.viewports[1].width,
                    height: self.pdfService.viewports[1].height,
                    ratio: self.pdfService.viewports[1].width / self.pdfService.viewports[1].height,
                };
            }

            o.numPages = self.pdfService.numPages;

            if (o.previewPages && o.numPages > o.previewPages) {
                o.numPages = o.previewPages;
                if (o.doublePage) o.backCover = false;
            }

            var pages = [];
            var pageSize = o.pageTextureSize;

            for (var i = 0; i < o.numPages; i++) {
                var p = {
                    canvas: {},
                };

                if (o.pages && o.pages[i]) {
                    FLIPBOOK.extend(p, o.pages[i]);
                }
                pages[i] = p;
            }

            o.pages = pages;
            o.pageWidth = parseInt((pageSize * self.viewportOriginal.width) / self.viewportOriginal.height);
            o.pageHeight = pageSize;
            o.pw = o.pageWidth;
            o.ph = o.pageHeight;
            // o.zoomSize = o.zoomSize || o.pageTextureSize;

            var tocArray = o.tableOfContent;
            if (o.btnToc.enabled && (!tocArray || !tocArray.length)) {
                var outline = await self.pdfService.loadOutline();
                if (outline) {
                    o.tableOfContent = outline;
                } else {
                    o.btnToc.enabled = false;
                }
            }

            if (o.doublePage || o.numPages % 2 == 1) o.cover = true;

            self.start();
        });

        function getFlipbookSrc() {
            var scripts = document.getElementsByTagName('script');
            for (var i = 0; i < scripts.length; i++) {
                var src = String(scripts[i].src);
                if (src.match('flipbook\\.js') || src.match('flipbook\\.min\\.js')) {
                    return src;
                } else if (src.match('flipbook\\.lite\\.js') || src.match('flipbook\\.lite\\.min\\.js')) {
                    return src.replace('.lite', '');
                }
            }
            return '';
        }

        FLIPBOOK.flipbookSrc = FLIPBOOK.flipbookSrc || this.options.flipbookSrc || getFlipbookSrc();

        const isMinified = FLIPBOOK.flipbookSrc.includes('flipbook.min.js');
        const replaceStr = isMinified ? 'flipbook.min.js' : 'flipbook.js';
        const suffix = isMinified ? '.min' : '';

        const sources = [
            { key: 'iscrollSrc', value: 'libs/iscroll' },
            { key: 'threejsSrc', value: 'libs/three' },
            { key: 'flipbookWebGlSrc', value: 'flipbook.webgl' },
            { key: 'flipbookBook3Src', value: 'flipbook.book3' },
            { key: 'flipBookSwipeSrc', value: 'flipbook.swipe' },
            { key: 'flipBookScrollSrc', value: 'flipbook.scroll' },
            { key: 'pdfjsSrc', value: 'libs/pdf' },
            { key: 'pdfServiceSrc', value: 'flipbook.pdfservice' },
            { key: 'pdfjsworkerSrc', value: 'libs/pdf.worker' },
            { key: 'markSrc', value: 'libs/mark' },
        ];

        sources.forEach((source) => {
            FLIPBOOK[source.key] = FLIPBOOK.flipbookSrc.replace(replaceStr, source.value + suffix + '.js');
        });

        if (!o.deeplinkingPrefix && o.deeplinking && o.deeplinking.prefix) {
            o.deeplinkingPrefix = o.deeplinking.prefix;
        }

        o.deeplinkingEnabled = o.deeplinkingPrefix || o.deeplinkingEnabled || (o.deeplinking && o.deeplinking.enabled);

        if (o.deeplinkingEnabled) {
            this.checkHash();
            window.addEventListener('hashchange', this.checkHash.bind(this));
        }

        o.l = ['load', 'front', 'rgb', 'length'];

        if (o.lightBox) {
            o.btnClose.enabled = true;

            this.lightbox = new FLIPBOOK.Lightbox(this, this.wrapper, o);
            this.lightboxStartedTimes = 0;
            this.wrapper.style.background = 'none';
            this.bookLayer.style.background = 'none';
            this.book.style.background = 'none';

            this.lightbox.overlay.appendChild(this.preloader);
            this.preloader.style.position = 'fixed';

            this.elements.forEach(function (el) {
                el.style.cursor = 'pointer';
                el.addEventListener('click', async function (e) {
                    if (!self.disposed) {
                        e.preventDefault();
                        self.lightboxStartPage = this.dataset.page;

                        if (self.started) {
                            await self.lightboxStart();

                            if (o.lightBoxFullscreen) {
                                setTimeout(async function () {
                                    self.toggleExpand();
                                }, 0);
                            }

                            self.lightbox.openLightbox();
                        } else {
                            self.init();
                            self.lightbox.openLightbox();

                            if (o.lightBoxFullscreen) {
                                setTimeout(async function () {
                                    self.toggleExpand();
                                }, 100);
                            }
                        }
                    }
                });
            });

            if (o.lightBoxOpened) {
                this.init();
                if (typeof jQuery != 'undefined') jQuery(window).trigger('r3d-lightboxloadingstarted');
            } else if (o.lightboxPreload) {
                preload();
            }

            // this.fullscreenElement = document.documentElement;
            this.fullscreenElement = document.body;
        } else {
            o.btnClose.enabled = false;
            this.wrapper.appendChild(this.preloader);
            this.elem.appendChild(this.wrapper);
            this.elem.style.background = this.wrapper.style.background;
            this.fullscreenElement = this.elem;

            const observer = new IntersectionObserver((entries) => {
                const isVisible = entries[0].isIntersecting;
                if (isVisible) {
                    if (!self.Book) {
                        self.init();
                    } else {
                        self.Book.enable();
                    }
                } else if (self.Book) {
                    self.Book.disable();
                }
            });
            observer.observe(this.wrapper);
        }
    }

    async start() {
        var o = this.options;

        if (o.pages.length == 1) {
            o.numPages = 1;
            o.doublePage = false;
            o.btnNext.enabled = false;
            o.btnPrev.enabled = false;
            o.btnFirst.enabled = false;
            o.btnLast.enabled = false;
            o.sideNavigationButtons = false;
            o.btnAutoplay.enabled = false;
            o.singlePageMode = true;
            o.viewMode = '3d'; //swipe not woring with 1 page
            o.rightToLeft = false;
            o.btnThumbs.enabled = false;
            o.btnToc.enabled = false;
            o.btnBookmark.enabled = false;
        }

        if (o.dp) {
            o.doublePage = true;
        }

        if (this.started) {
            return;
        }

        const pageAspect = this.options.pageWidth / this.options.pageHeight;

        if (pageAspect > 1) {
            this.options.pageTextureSize /= pageAspect;
            this.options.pageTextureSizeSmall /= pageAspect;
            this.options.pageWidth /= pageAspect;
            this.options.pageHeight /= pageAspect;
        }
        this.options.zoomSize = this.options.zoomSize || this.options.pageTextureSize;

        this.pageW = this.options.pageWidth;
        this.bookW = 2 * this.options.pageWidth;
        if (this.options.singlePageMode) {
            this.bookW /= 2;
        }
        this.pageH = this.options.pageHeight;
        this.bookH = this.options.pageHeight;

        if (this.options.numPages % 2 == 0) {
            this.options.numSheets = (this.options.numPages + 2) / 2;
        } else {
            this.options.numSheets = (this.options.numPages + 1) / 2;
        }

        this.started = true;

        if (this.options.lightBox) {
            this.lightbox.openLightbox();
            await this.lightboxStart();
        }

        const pageClickAreaWdith = this.options.pageClickAreaWdith;
        const numPages = this.options.pages.length;
        const doublePage = this.options.doublePage;
        const singlePageMode = this.options.singlePageMode;
        const scrollMode = this.options.viewMode == 'scroll';

        const htmlWidth = (this.options.pageWidth * 1000) / this.options.pageHeight;
        const xPos = htmlWidth - 50;
        const xPosDouble = 2 * htmlWidth - 50;

        this.options.pages.hasHtmlContent = this.options.pages
            ? this.options.pages.some((page) => !!page.htmlContent)
            : false;

        var rtl = this.options.rightToLeft;
        var self = this;

        if (pageClickAreaWdith && !scrollMode) {
            this.options.pages.forEach(function (page, index) {
                page.htmlContent = page.htmlContent || '';
                if (singlePageMode) {
                    if (index > 0) {
                        rtl ? addBtnPrev(page) : addBtnNext(page);
                    }
                    if (index < numPages - 1) {
                        rtl ? addBtnNext(page) : addBtnPrev(page);
                    }
                } else {
                    if (doublePage) {
                        if (self.options.cover && index == 0) {
                            rtl ? addBtnPrev(page) : addBtnNext(page);
                        } else if (self.options.backCover && index == self.options.pages.length - 1) {
                            rtl ? addBtnPrev(page) : addBtnNext(page);
                        } else {
                            addBtnPrev(page);
                            addBtnNext(page, true);
                        }
                    } else {
                        if (index % 2 == 0) {
                            rtl ? addBtnPrev(page) : addBtnNext(page);
                        } else {
                            rtl ? addBtnNext(page) : addBtnPrev(page);
                        }
                    }
                }
            });
        }

        function addBtnPrev(page) {
            page.htmlContent +=
                '<a href="#" draggable="false" class="internalLink pageClickArea pageClickAreaLeft" data-page="prev"></a>';
        }

        function addBtnNext(page, double) {
            const left = double ? xPosDouble : xPos;
            page.htmlContent +=
                '<a href="#" draggable="false" class="internalLink pageClickArea pageClickAreaRight" data-page="next" style="left:' +
                left +
                'px;"></a>';
        }

        await this.createBook();
        this.createTooltip();
        if (this.options.btnNotes.enabled) {
            this.initNotes();
        }
    }

    async checkHash() {
        if (this.disposed) {
            return;
        }
        const o = this.options;

        var fullHash = window.location.hash;

        var targetPage = this.getPageFromHash();
        if (!o.cover) {
            targetPage++;
        }
        var startPage = targetPage;
        if (targetPage < 1) {
            targetPage = 1;
        } else if (this.numPages && targetPage > this.numPages) {
            targetPage = this.numPages;
        }
        if (targetPage) {
            if (!this.started) {
                o.startPage = startPage;

                if (o.lightBox) {
                    this.init();

                    if (o.lightBoxFullscreen) {
                        setTimeout(() => {
                            this.toggleExpand();
                        }, 100);
                    }
                }
            } else if (this.Book) {
                if (this.lightbox && !this.lightbox.lightboxOpened) {
                    this.lightbox.openLightbox();
                    await this.lightboxStart();
                }
                this.goToPage(targetPage, fullHash.indexOf('flip') == -1);
            }
        }
    }

    async init() {
        if (this.initStarted) {
            return;
        }
        this.initStarted = true;
        const o = this.options;

        const loadImage = (src) => {
            return new Promise((resolve, reject) => {
                const img = new Image();
                img.src = src;
                img.onload = () => resolve(img);
                img.onerror = reject;
            });
        };

        if (o.fillPreloader.enabled) {
            const fillPreloader = document.createElement('div');
            fillPreloader.classList.add('flipbook-fillPreloader');

            try {
                const empty = await loadImage(o.fillPreloader.imgEmpty);
                const full = await loadImage(o.fillPreloader.imgFull);

                fillPreloader.appendChild(empty);
                fillPreloader.appendChild(full);

                this.$fillPreloader = fillPreloader;
                this.$fillPreloaderImg = full;

                this.wrapper.appendChild(fillPreloader);
            } catch (error) {
                console.error('Error loading preloader images', error);
            }
        }

        if (this.initialized) {
            return;
        }

        this.define = window.define;
        window.define = null;

        this.id = this.uniqueID;

        this.addPageItems();
        if (o.pageCaptions) this.addPageCaptions();

        if (o.pdfMode) {
            this.initPdf();
        } else {
            this.initJpg();
        }

        this.setLoadingProgress(0.1);

        this.initialized = true;
    }

    bodyHasVerticalScrollbar() {
        return document.body.scrollHeight > window.innerHeight;
    }

    isIframe() {
        try {
            return window.self !== window.top;
        } catch (e) {
            return true;
        }
    }

    isZoomed() {
        return this.zoom > 1;
    }

    async lightboxStart() {
        var self = this,
            o = this.options;
        if (!this.started) {
            await this.start();
        }

        if (typeof this.Book == 'undefined') {
            setTimeout(function () {
                self.lightboxStart();
            }, 100);
            return;
        }

        this.Book.enable();

        this.playBgMusic();

        this.lightboxStartedTimes++;

        this.sendGAEvent({
            event: 'flipbook_lightbox_open',
            book_name: this.options.name,
            nonInteraction: true,
        });

        this.updateCurrentPage();
        this.lightbox.openLightbox();
        this.resize();

        var targetPage;
        if (!window.location.hash) {
            targetPage = this.lightboxStartPage || this.options.lightboxStartPage;
        }

        if (targetPage) {
            this.goToPage(targetPage, true);
        }
    }

    setHash(page) {
        if (page < 1) {
            page = 1;
        }

        if ('#' + this.options.deeplinkingPrefix + page == window.location.hash) {
            return;
        }

        if (this.options.deeplinkingEnabled && this.Book.enabled && this.hash != page) {
            window.location.hash = '#' + this.options.deeplinkingPrefix + String(page);
            this.historyStateChange();
            this.hash = page;
        }
    }

    historyStateChange(changes) {
        this.historyStateChanges = this.historyStateChanges || 0;
        if (typeof changes != 'undefined') this.historyStateChanges = changes;
        else this.historyStateChanges++;
    }

    clearHash() {
        }

    getPageFromHash() {
        var page;
        return page;
    }

    async sendGAEvent(params) {
        }

    lightboxEnd() {
        if (document.fullscreenElement) {
            this.toggleExpand();
            this.toggleIcon(this.btnExpand, true);
        }

        if (window.location.hash) {
            this.clearHash();
        }

        if (this.historyStateChanges) {
            // history.go(-this.historyStateChanges);
            this.historyStateChange(0);
        }

        this.setLoadingProgress(1);

        if (this.Book) {
            this.Book.zoomTo(this.options.zoomMin);
            this.Book.disable();
        }

        this.pauseMediaPlayback();

        if (this.backgroundMusic) {
            this.backgroundMusic.pause();
        }
    }

    pauseMediaPlayback() {
        if (this.mediaElements)
            this.mediaElements.forEach((media) => {
                if (media.tagName.toLowerCase() === 'video' || media.tagName.toLowerCase() === 'audio') {
                    media.pause();
                } else if (media.tagName.toLowerCase() === 'iframe') {
                    const src = media.src || media.getAttribute('src') || '';
                    if (
                        (src.includes('youtube.com/embed') || src.includes('youtube-nocookie.com/embed')) &&
                        media.contentWindow
                    ) {
                        try {
                            media.contentWindow.postMessage(
                                JSON.stringify({
                                    event: 'command',
                                    func: 'pauseVideo',
                                    args: [],
                                }),
                                '*'
                            );
                        } catch (e) {}
                    }
                }
            });
        if (this.pageAudioPlayer) {
            this.pageAudioPlayer.pause();
        }
        if (this.youtubes) {
            this.youtubes.forEach((ytWrapper) => {
                const player = ytWrapper.player;
                ytWrapper.dataset.ytCurrentTime = player.getCurrentTime();
                ytWrapper.dataset.ytMuted = player.isMuted();
                player.pauseVideo();
            });
        }
    }

    turnPageStart() {
        this.pauseMediaPlayback();
        this.resumeGlobalSound();
        this.playFlipSound();
    }

    turnPageComplete() {
        this.animating = false;
        this.updateCurrentPage();

        var rightIndex = this.Book.rightIndex || 0;

        if (this.options.rightToLeft) {
            rightIndex = this.options.pages.length - rightIndex;
        }

        this.trigger('turnpagecomplete', { rightIndex: rightIndex });

        if (this.options.zoomReset) {
            this.Book.zoomTo(this.options.zoomMin);
        }
    }

    updateCurrentPage() {
        var rtl = this.options.rightToLeft;
        var total = this.options.numPages;
        var totalDisplay = total - this.options.pageNumberOffset;
        var rightIndex = this.Book.rightIndex || 0;
        var s;

        if (rightIndex % 2 == 1) {
            rightIndex++;
        }

        if (rtl) {
            rightIndex = this.Book.numSheets * 2 - rightIndex;
        }

        let ri = this.options.cover ? rightIndex : rightIndex - 1;

        if (this.options.singlePageMode || this.Book.singlePage || this.Book.view == 1) {
            if (this.Book.getCurrentPageNumber) {
                s = this.Book.getCurrentPageNumber();
            } else {
                if (rtl) {
                    rightIndex--;
                }

                s = rightIndex + 1;
            }

            this.setHash(s);
            this.cPage = [s - 1];
        } else {
            if (ri > total || (ri == total && total % 2 == 0)) {
                s = total;
                this.cPage = [total - 1];
            } else if (ri < 1) {
                s = 1;
                this.cPage = [0];
            } else {
                s = String(ri) + '-' + String(ri + 1);
                this.cPage = [ri - 1, ri];
            }

            this.setHash(ri);
        }

        this.enableNext(this.Book.canFlipNext());
        this.enablePrev(this.Book.canFlipPrev());

        if (this.cPage.length === 2) {
            this.wrapper.querySelectorAll('.c-l-p').forEach(function (element) {
                element.classList.remove('flipbook-hidden');
            });
            this.wrapper.querySelectorAll('.c-r-p').forEach(function (element) {
                element.classList.remove('flipbook-hidden');
            });

            this.wrapper.querySelectorAll('.c-p').forEach(function (element) {
                element.classList.add('flipbook-hidden');
            });
        } else {
            this.wrapper.querySelectorAll('.c-l-p').forEach(function (element) {
                element.classList.add('flipbook-hidden');
            });
            this.wrapper.querySelectorAll('.c-r-p').forEach(function (element) {
                element.classList.add('flipbook-hidden');
            });

            this.wrapper.querySelectorAll('.c-p').forEach(function (element) {
                element.classList.remove('flipbook-hidden');
            });
        }

        if (typeof this.currentPage === 'undefined') {
            return;
        }

        this.s && this.options.pdfPageScale > 0 && this.goToPage(0);

        if (s != this.currentPageValue) {
            this.currentPageValue = String(s);

            var first = Number(String(s).split('-')[0]);
            var second = Number(String(s).split('-')[1]);

            if (first && this.options.pages[Number(first - 1)] && this.options.pages[Number(first - 1)].name) {
                first = this.options.pages[Number(first - 1)].name;
            }

            if (second && this.options.pages[Number(second - 1)] && this.options.pages[Number(second - 1)].name) {
                second = this.options.pages[Number(second - 1)].name;
            }

            if (first && second) {
                s = first + '-' + second;
            } else if (first) {
                s = first;
            } else if (second) {
                s = second;
            } else {
                s = 1;
            }

            this.currentPageString = s;
            this.currentPageInput.dispatchEvent(new Event('blur', { bubbles: true, cancelable: true }));

            this.currentPage.textContent = ' / ' + String(totalDisplay);

            const span = document.createElement('span');
            span.style.visibility = 'hidden';
            span.style.position = 'absolute';
            span.style.whiteSpace = 'pre';
            span.className = 'flipbook-currentPageInput';
            document.body.appendChild(span);
            span.textContent = s;

            this.currentPageInput.style.width = `${span.offsetWidth + 2}px`;

            document.body.removeChild(span);

            this.resize();

            if (typeof jQuery != 'undefined') {
                jQuery(this).trigger({
                    type: 'pagechange',
                    page: this.currentPageValue,
                    name: this.options.name,
                });

                jQuery(window).trigger({
                    type: 'r3d-pagechange',
                    page: this.currentPageValue,
                    name: this.options.name,
                });
            } else {
                var r3dPageChangeEvent = new CustomEvent('r3d-pagechange', {
                    detail: {
                        page: this.currentPageValue,
                        name: this.options.name,
                    },
                });
                window.dispatchEvent(r3dPageChangeEvent);
            }

            this.trigger('pagechange');

            this.sendGAEvent({
                event: 'flipbook_page_view',
                book_name: this.options.name,
                page_number: this.currentPageValue,
                nonInteraction: true,
            });

            this.flippingPage = false;
        }
    }

    async initJpg() {
        const o = this.options;
        let pages = o.pages || [];

        if (o.previewPages) pages = pages.slice(0, o.previewPages);
        if (o.pageRangeStart || o.pageRangeEnd) {
            const start = Math.max((o.pageRangeStart || 1) - 1, 0);
            const end = Math.min(o.pageRangeEnd || pages.length, pages.length);
            pages = pages.slice(start, end);
        }
        o.pages = pages;
        const count = pages.length;

        const loadPage = (idx) => new Promise((resolve) => this.loadPage(idx, o.pageTextureSize, resolve));

        if (!o.hasHtmlContent && !pages.some((p) => p.json)) o.btnSearch.enabled = false;
        if (!o.tableOfContent.length && !pages.some((p) => p.title)) o.btnToc.enabled = false;

        const getDims = ({ width, height, img }) => [width || img.width, height || img.height];

        this.setLoadingProgress(0.5);
        await loadPage(0);
        const [pw, ph] = getDims(pages[0]);
        Object.assign(o, {
            pw,
            ph,
            pageWidth: pw,
            pageHeight: ph,
            zoomSize: o.zoomSize || ph,
        });
        if (count === 1) return this.start();

        await loadPage(1);
        const [pw2, ph2] = getDims(pages[1]);
        Object.assign(o, { pageWidth2: pw2, pageHeight2: ph2 });
        const ratio = pw / ph;
        o.doublePage = o.scaleCover || pw2 / ph2 / ratio > 1.5;
        if (!o.doublePage) o.backCover = count % 2 === 0;

        if (count > 2 && o.doublePage) {
            await loadPage(count - 1);
            const [pwL, phL] = getDims(pages[count - 1]);
            o.backCover = pw2 / ph2 / (pwL / phL) > 1.5;
        }

        if (o.doublePage || count % 2 == 1) o.cover = true;

        this.start();
    }

    async initPdf() {
        if (this.started) {
            return;
        }

        this.setLoadingProgress(0.2);

        await this.loadScript(FLIPBOOK.pdfjsSrc, 'pdfjsLib');
        await this.loadScript(FLIPBOOK.pdfServiceSrc, 'FLIPBOOK.PdfService');

        if (window.CanvasPixelArray) {
            window.CanvasPixelArray.prototype.set = function (arr) {
                var l = this.length;
                var i = 0;

                for (; i < l; i++) {
                    this[i] = arr[i];
                }
            };
        }

        pdfjsLib.GlobalWorkerOptions.workerSrc = this.options.pdfjsworkerSrc || FLIPBOOK.pdfjsworkerSrc;

        this.pdfService = new FLIPBOOK.PdfService(this, this.options);
    }

    initPageHTML(index) {
        const page = this.options.pages[index];
        if (page.htmlInitialized) {
            return;
        }

        this.addPageLinks(page);
        this.addPageNotes(page);
        this.addMediaListeners(page);

        page.htmlInitialized = true;
    }

    addMediaListeners(page) {
        if (page.htmlContent && page.htmlContent instanceof Element) {
            const mediaElementsOnThisPage = page.htmlContent.querySelectorAll('video, audio, iframe');
            this.mediaElements = this.mediaElements || [];
            this.mediaElements.push(...mediaElementsOnThisPage);
        }
    }

    addPageLinks(page) {
        }

    pauseGlobalSound() {
        this.toggleSound(false);
        this.soundPaused = true;
    }

    resumeGlobalSound() {
        if (this.soundPaused) this.toggleSound(true);
    }

    addPageNames() {
        const offset = this.options.pageNumberOffset;

        function convertToRoman(num) {
            const romanMap = [
                { value: 1000, numeral: 'M' },
                { value: 900, numeral: 'CM' },
                { value: 500, numeral: 'D' },
                { value: 400, numeral: 'CD' },
                { value: 100, numeral: 'C' },
                { value: 90, numeral: 'XC' },
                { value: 50, numeral: 'L' },
                { value: 40, numeral: 'XL' },
                { value: 10, numeral: 'X' },
                { value: 9, numeral: 'IX' },
                { value: 5, numeral: 'V' },
                { value: 4, numeral: 'IV' },
                { value: 1, numeral: 'I' },
            ];

            let romanNumeral = '';

            romanMap.forEach(function (mapEntry) {
                while (num >= mapEntry.value) {
                    romanNumeral += mapEntry.numeral;
                    num -= mapEntry.value;
                }
            });

            return romanNumeral;
        }

        this.options.pages.forEach(function (page, index) {
            if (typeof page.name == 'undefined') {
                page.name = index - offset + 1;
                if (page.name < 1) {
                    page.name = convertToRoman(index + 1);
                }
            }
        });
    }

    async loadPageHTML(index, callback) {
        var self = this;
        var options = this.options;

        if (index < 0) {
            callback.call(this, {});
            return;
        }

        if (options.pdfMode) {
            if (!options.pages[index]) {
                callback.call(this, {});
            } else {
                self.initPageHTML(index);
                    callback.call(self, options.pages[index].htmlContent, index);
                    }
        }
        else {
            this.initPageHTML(index);

            callback.call(this, options.pages[index].htmlContent, index);
        }
    }

    async fetchAndCacheImage(url) {
        // Initialize cache as Map for better performance over object
        this.imageCache ??= new Map();

        // Early return for cached image
        let cached = this.imageCache.get(url);
        if (cached) return cached;

        try {
            // Create and cache promise immediately to prevent duplicate fetches
            const imagePromise = (async () => {
                const response = await fetch(url, { cache: 'force-cache' });
                if (!response.ok) throw new Error(`Fetch failed: ${response.status}`);

                const blob = await response.blob();
                const { bitmapResizeHeight, bitmapResizeQuality } = this.options ?? {};

                // Only create params object if needed
                const params = {};
                if (bitmapResizeHeight) params.resizeHeight = bitmapResizeHeight;
                if (bitmapResizeQuality) params.resizeQuality = bitmapResizeQuality;

                return createImageBitmap(blob, Object.keys(params).length ? params : undefined);
            })();

            this.imageCache.set(url, imagePromise);
            return await imagePromise;
        } catch (error) {
            // Remove failed promise from cache to allow retry
            this.imageCache.delete(url);
            throw error;
        }
    }

    loadPage(index, size, callback) {
        var self = this;
        var pageSrc = this.options.pages && this.options.pages[index] && this.options.pages[index].src;
        var page = this.options.pages[index];

        if (!page) {
            callback.call(this);
            return;
        }

        if (this.options.pdfMode && !pageSrc) {
            this.loadPageFromPdf(index, size, callback);
        } else {
            if (size == this.options.thumbTextureSize && page.thumb) {
                if (!page.thumbImg && page.thumb) {
                    page.thumbImg = new Image();
                    page.thumbImg.decoding = 'async';
                    page.thumbImg.setAttribute('data-id', index);

                    page.thumbImg.onload = function () {
                        page.thumbLoaded = true;

                        self.pageLoaded(
                            {
                                index: index,
                                size: size,
                                image: page.thumbImg,
                            },
                            callback
                        );
                    };

                    if (this.options.viewMode == 'webgl') {
                        page.thumbImg.crossOrigin = 'Anonymous';
                    }

                    if (self.options.matchProtocol !== false) {
                        const currentProtocol = location.protocol;
                        if (!page.thumb.startsWith(currentProtocol)) {
                            page.thumb = page.thumb.replace(/^https?:/, currentProtocol);
                        }
                    }
                    page.thumbImg.src = page.thumb;
                } else if (page.thumbLoaded) {
                    self.pageLoaded({ index: index, size: size, image: page.thumb }, callback);
                } else {
                    setTimeout(function () {
                        self.loadPage(index, size, callback);
                    }, 300);
                }
            } else {
                if (!page.img && page.src) {
                    if (self.options.matchProtocol !== false) {
                        const currentProtocol = location.protocol;
                        if (!page.src.startsWith(currentProtocol)) {
                            page.src = page.src.replace(/^https?:/, currentProtocol);
                        }
                    }

                    if (self.options.viewMode == 'webgl') {
                        self.fetchAndCacheImage(page.src).then((imageBitmap) => {
                            page.imgLoaded = true;
                            page.width = imageBitmap.width;
                            page.height = imageBitmap.height;
                            self.pageLoaded(
                                {
                                    index: index,
                                    size: size,
                                    imageBitmap: imageBitmap,
                                },
                                callback
                            );
                        });
                    } else {
                        page.img = new Image();
                        page.img.decoding = 'async';
                        page.img.setAttribute('data-id', index);

                        page.img.onload = function () {
                            page.imgLoaded = true;
                            self.pageLoaded(
                                {
                                    index: index,
                                    size: size,
                                    image: page.img,
                                },
                                callback
                            );
                        };
                        page.img.src = page.src;
                    }
                } else if (page.imgLoaded) {
                    self.pageLoaded({ index: index, size: size, image: page.img }, callback);
                } else {
                    setTimeout(function () {
                        self.loadPage(index, size, callback);
                    }, 300);
                }
            }
        }
    }

    pageLoaded(page, callback) {
        callback.call(this, page, callback);

        if (this.options.loadAllPages && page.index < this.options.numPages - 1) {
            this.loadPage(page.index + 1, page.size, function () {});
        }

        if (this.searchingString) {
            this.mark(this.searchingString, true);
        }
    }

    loadPageFromPdf(pageIndex, size, callback) {
        size = size || this.options.pageTextureSize;
        // console.log(this.Book.getPageHeight());
        this.pdfService.renderBookPage(pageIndex, size, callback);
    }

    getString(name) {
        return this.options.strings[name];
    }

    async mark(str) {
        await this.loadScript(FLIPBOOK.markSrc, 'Mark');

        this.markedStr = str;
        var textLayer = this.wrapper.querySelectorAll('.textLayer');

        var nodesToMark = Array.from(textLayer).filter(function (node) {
            var markedData = node.getAttribute('data-marked');
            return !(markedData && markedData.split(',').includes(str));
        });

        if (nodesToMark.length) {
            var instance = new Mark(nodesToMark);
            instance.nodes = nodesToMark;

            this.markInstances = this.markInstances || [];
            this.markInstances.push(instance);

            instance.unmark({
                className: 'mark-search',
                done: function () {
                    instance.mark(str, {
                        acrossElements: true,
                        separateWordSearch: false,
                        className: 'mark-blue mark-search',
                        done: function () {
                            nodesToMark.forEach(function (node) {
                                var markedData = node.getAttribute('data-marked') || '';
                                var markedArray = markedData ? markedData.split(',') : [];
                                if (!markedArray.includes(str)) {
                                    markedArray.push(str);
                                    node.setAttribute('data-marked', markedArray.join(','));
                                }
                            });
                        },
                    });
                },
            });
        }
    }

    unmark() {
        this.searchingString = null;
        this.markedStr = null;

        this.markInstances = this.markInstances || [];

        if (this.markInstances.length) {
            this.markInstances.forEach(function (instance) {
                instance.unmark({
                    className: 'mark-search',
                    done: function () {
                        instance.nodes.forEach(function (node) {
                            node.removeAttribute('data-marked');
                        });
                    },
                });
            });

            this.markInstances = [];
        }
    }

    toggleSound(value) {
        var o = this.options;
        if (typeof value != 'undefined') o.sound = value;
        else o.sound = !o.sound;
        if (this.backgroundMusic) {
            o.sound ? this.backgroundMusic.play() : this.backgroundMusic.pause();
        }
        this.toggleIcon(this.btnSound, o.sound);
    }

    toggleIcon(btn, val) {
        if (!btn) return;
        if (btn.$iconAlt) {
            if (val) {
                btn.$iconAlt.classList.add('flipbook-hidden');
                btn.$icon.classList.remove('flipbook-hidden');
            } else {
                btn.$iconAlt.classList.remove('flipbook-hidden');
                btn.$icon.classList.add('flipbook-hidden');
            }
        } else {
            var prev = val ? btn.iconAlt : btn.icon;
            var curr = val ? btn.icon : btn.iconAlt;

            btn.find('.' + prev)
                .removeClass(prev)
                .addClass(curr);
        }
    }

    scrollPageIntoView(obj) {
        let targetPage = obj.pageNumber;

        if (this.options.doublePage) {
            targetPage = 2 * targetPage - 1;
        }

        this.goToPage(targetPage);
    }

    loadScript(src, globalVariable) {
        if (src.indexOf('?ver') === -1) src += `?ver=${FLIPBOOK.version}`;

        FLIPBOOK.scripts = FLIPBOOK.scripts || {};

        const isGlobalVariableDefined = (name) => {
            return name.split('.').reduce((acc, part) => acc && acc[part], window) !== undefined;
        };

        return new Promise((resolve, reject) => {
            if (globalVariable && isGlobalVariableDefined(globalVariable)) return resolve();

            const scriptData = FLIPBOOK.scripts[src];
            if (scriptData) {
                if (scriptData.loaded) {
                    return resolve();
                } else {
                    scriptData.promises.push({ resolve, reject });
                    return;
                }
            }

            FLIPBOOK.scripts[src] = { loaded: false, promises: [{ resolve, reject }] };

            let script = document.createElement('script');
            script.async = true;
            script.src = src;

            script.onload = script.onreadystatechange = function (_, isAbort) {
                if (!isAbort && (!script.readyState || /loaded|complete/.test(script.readyState))) {
                    script.onload = script.onreadystatechange = null;
                    FLIPBOOK.scripts[src].loaded = true;
                    FLIPBOOK.scripts[src].promises.forEach((p) => p.resolve());
                }
            };

            script.onerror = (error) => {
                FLIPBOOK.scripts[src].promises.forEach((p) => p.reject(error));
                FLIPBOOK.scripts[src] = undefined;
            };

            document.head.appendChild(script);
        });
    }

    async initGoogleAnalytics() {
        if (!document.querySelector(`script[src="https://www.googletagmanager.com/gtag/js?id=${this.gaCode}"]`)) {
            return new Promise((resolve, reject) => {
                var script = document.createElement('script');
                script.setAttribute('src', 'https://www.googletagmanager.com/gtag/js?id=' + this.gaCode);
                const self = this;
                script.async = 1;
                script.onload = function () {
                    window.dataLayer = window.dataLayer || [];
                    function gtag() {
                        dataLayer.push(arguments);
                    }
                    gtag('js', new Date());
                    gtag('config', self.gaCode);
                    resolve();
                };
                script.onerror = function () {
                    reject(new Error('Google Analytics script failed to load'));
                };
                document.body.appendChild(script);
            });
        } else {
            return Promise.resolve();
        }
    }

    async createBook() {
        var self = this;
        var options = this.options;

        if (this.options.searchOnStart) {
            this.options.btnSearch.enabled = true;
        }

        this.setLoadingProgress(0.9);

        if (this.options.viewMode === 'webgl') {
            await this.loadScript(FLIPBOOK.threejsSrc, 'THREE');
            await this.loadScript(FLIPBOOK.flipbookWebGlSrc, 'FLIPBOOK.BookWebGL');
        } else if (this.options.viewMode === 'swipe') {
            await this.loadScript(FLIPBOOK.iscrollSrc, 'IScroll');
            await this.loadScript(FLIPBOOK.flipBookSwipeSrc, 'FLIPBOOK.BookSwipe');
        } else if (this.options.viewMode === 'scroll') {
            await this.loadScript(FLIPBOOK.iscrollSrc, 'IScroll');
            await this.loadScript(FLIPBOOK.flipBookScrollSrc, 'FLIPBOOK.BookScroll');
        } else {
            await this.loadScript(FLIPBOOK.iscrollSrc, 'IScroll');
            await this.loadScript(FLIPBOOK.flipbookBook3Src, 'FLIPBOOK.Book3');
        }

        window.define = this.define;

        this.setLoadingProgress(1);

        this.options.pagesOriginal = this.options.pages;

        if (this.options.doublePage && this.options.pages.length > 2) {
            var p = this.options.pages[0];
            var left;
            var right;
            p.title = 1;
            var newArr = [p];

            var numPages = this.options.pages.length;
            if (this.options.previewPages) numPages = numPages / 2;

            for (var i = 1; i <= numPages - 2; i++) {
                p = this.options.pages[i];
                left = {
                    src: p.src,
                    thumb: p.thumb,
                    title: 2 * i,
                    htmlContent: p.htmlContent,
                    json: p.json,
                    side: 'left',
                };
                right = {
                    src: p.src,
                    thumb: p.thumb,
                    title: 2 * i + 1,
                    htmlContent: p.htmlContent,
                    json: p.json,
                    side: 'right',
                };
                newArr.push(left);
                newArr.push(right);
            }

            p = this.options.pages[this.options.pages.length - 1];
            p.title = this.options.pages.length;

            if (this.options.backCover) {
                newArr.push(p);
            } else {
                left = {
                    src: p.src,
                    thumb: p.thumb,
                    title: 2 * i,
                    htmlContent: p.htmlContent,
                    json: p.json,
                    side: 'left',
                };
                right = {
                    src: p.src,
                    thumb: p.thumb,
                    title: 2 * i + 1,
                    htmlContent: p.htmlContent,
                    json: p.json,
                    side: 'right',
                };
                newArr.push(left);
                newArr.push(right);
            }
            this.options.pages = newArr;
        }

        this.addPageNames();

        this.options.numPages = this.options.pages.length;
        if (this.options.numPages % 2 != 0 && !this.options.singlePageMode) {
            this.options.backCover = false;
        }
        if (!this.options.cover) {
            this.options.backCover = !this.options.backCover;
        }

        this.options.pages.forEach((page) => {
            const content = page.htmlContent || '';
            const container = document.createElement('div');
            container.className = 'flipbook-page-html';

            const innerDiv = document.createElement('div');
            innerDiv.className = 'htmlContent';
            innerDiv.innerHTML = content;

            container.appendChild(innerDiv);

            page.htmlContent = container;
        });

        if (this.options.viewMode == 'webgl') {
            var bookOptions = this.options;
            bookOptions.scroll = this.scroll;
            bookOptions.parent = this;
            this.Book = new FLIPBOOK.BookWebGL(this.book, this, bookOptions);
            this.webglMode = true;

            this.initSound();
        } else if (this.options.viewMode == 'swipe') {
            this.Book = new FLIPBOOK.BookSwipe(this.book, this.bookLayer, this, options);
        } else if (this.options.viewMode == 'scroll') {
            this.options.singlePageMode = true;
            this.Book = new FLIPBOOK.BookScroll(this.book, this.bookLayer, this, options);
        } else {
            if (this.options.viewMode != '2d') {
                this.options.viewMode = '3d';
            }

            this.Book = new FLIPBOOK.Book3(this.book, this, options);

            this.webglMode = false;
            this.initSound();
        }
        this.initSwipe();

        this.initListeners();

        this.resize();

        this.Book.enable();
        this.book.classList.remove('flipbook-hidden');

        if (!options.cover && options.startPage < 2) options.startPage = 2;

        this.tocCreated = false;

        if (!this.options.pdfMode) {
        }

        this.createMenu();

        if (!this.options.sound) this.toggleSound(false);

        this.onZoom(this.options.zoomMin);

        if (this.options.pages.length == 1) {
            this.rightToLeft = false;
        }

        FLIPBOOK.books = FLIPBOOK.books || {};
        FLIPBOOK.books[self.id] = self.Book;

        this.createLogo();
        this.onBookCreated();
    }

    async destroy() {
        if (this.pdfService) {
            if (this.pdfService.pages) {
                this.pdfService.pages.forEach(function (page) {
                    if (page.renderingTasks) {
                        page.renderingTasks.forEach(function (task) {
                            task.cancel();
                        });
                    }
                });
            }

            if (this.pdfService.pdfDocument) {
                this.pdfService.pdfDocument.cleanup();
                await this.pdfService.pdfDocument.destroy();
                this.pdfService.pdfDocument = null;
                this.pdfService = null;
            }
        }

        if (!this.bookCreated) {
            setTimeout(this.destroy.bind(this), 100);
            return;
        }

        this.Book.destroy();

        if (this.autoplayTimer) clearInterval(this.autoplayTimer);
        this.setBookmarkedPages([]);

        delete FLIPBOOK.books[this.id];
        this.Book = null;
        this.initPdf = null;
        this.createMenu = null;
        this.createBook = null;
        this.options = null;
        this.resizeObserver.disconnect();
        this.resizeObserver.disconnect();
        this.removeEventListeners();
    }

    initNotes() {
        this.noteService = new FLIPBOOK.Notes(this);
        const self = this;
        window.addEventListener('r3d-update-note-visibility', function (e) {
            self.options.noteTypes.forEach(function (noteType) {
                if (e.detail.id == noteType.id) {
                    noteType.enabled = e.detail.enabled;
                }
            });
            self.noteService.updateNoteVisibility();
        });
    }

    createTooltip() {
        this.tooltip = new FLIPBOOK.Tooltip();
        this.wrapper.appendChild(this.tooltip.domElement);
    }

    showTooltip(params) {
        this.tooltip.show(params);
    }

    hideTooltip() {
        this.tooltip.hide();
    }

    addPageItems() {
        }

    addPageCaptions() {
        const pages = this.options.pages;
        for (let key in pages) {
            let page = pages[key];
            page.htmlContent = page.htmlContent || '';

            if (typeof page.caption == 'string' && page.caption != '') {
                const icon = this.createSVGIcon('camera');
                page.htmlContent += '<div class="flipbook-page-caption-btn">';
                page.htmlContent += icon.outerHTML;
                page.htmlContent += '</div>';

                const caption = '<div class="flipbook-page-caption">' + page.caption + '</div>';
                page.htmlContent += caption;
            }
        }
    }

    spotlight(url, title, description) {
        }

    showMenu() {
        this.menuTop.classList.remove('flipbook-hidden');
        this.menuBottom.classList.remove('flipbook-hidden');
    }

    hideMenu() {
        this.menuTop.classList.add('flipbook-hidden');
        this.menuBottom.classList.add('flipbook-hidden');
    }

    showCenterExpandButton() {
        if (!this.centerButtonExpand) {
            const btn = document.createElement('div');
            btn.className = 'flipbook-center-btn-expand';
            const icon = this.createSVGIcon('expand');
            btn.appendChild(icon);
            btn.addEventListener('click', () => {
                this.toggleExpand();
            });
            this.wrapper.appendChild(btn);
            this.centerButtonExpand = btn;
        }
        this.centerButtonExpand.classList.remove('flipbook-hidden');
    }

    hideCenterExpandButton() {
        if (this.centerButtonExpand) this.centerButtonExpand.classList.add('flipbook-hidden');
    }

    toggleMinimalView() {
        if (this.wrapperW < this.options.minimalViewTreshold && !this.lightbox) {
            if (!this.minimalViewActive) {
                this.hideMenu();
                this.showCenterExpandButton();
                this.minimalViewActive = true;
                this.goToPage(1, true);
            }
        } else if (this.minimalViewActive) {
            this.showMenu();
            this.hideCenterExpandButton();
            this.minimalViewActive = false;
        }
    }

    resizeContainer() {
        if (this.options.minimalView) this.toggleMinimalView();
        if (!this.lightbox && !this.options.fullscreen && !this.elemStatic) {
            var pageRatio = this.pageW / this.pageH;
            var bookRatio = 2 * pageRatio;
            let width = this.elem.getBoundingClientRect().width;
            let ratio;

            if (this.options.isMobile && width < this.options.responsiveViewTreshold) {
                ratio = pageRatio;
            } else {
                ratio = bookRatio;
            }

            var newHeight = width / (this.options.containerRatio || ratio);

            newHeight += this.wrapper.clientHeight - this.bookLayer.clientHeight;

            this.elem.style.height = newHeight + 'px';
        }
        this.resize();
    }

    addEventListeners() {
        this.handleResize = () => this.resizeContainer();
        this.handleKeydown = (e) => {
            if (!this.Book.enabled) {
                return;
            }

            if (!this.options.lightBox && document.body.classList.contains('flipbook-overflow-hidden')) {
                return;
            }

            if (!this.fullscreenActive && document.body.classList.contains('flipbook-fullscreen')) {
                return;
            }

            if (
                !(this.options.arrowsAlwaysEnabledForNavigation && (e.keyCode == 37 || e.keyCode == 39)) &&
                (this.options.lightBox ||
                    this.fullscreenActive ||
                    (!this.options.arrowsDisabledNotFullscreen && !this.bodyHasVerticalScrollbar()))
            ) {
                return;
            }

            switch (e.keyCode) {
                case 37:
                    this.zoom > 1 ? this.moveBook('left') : this.prevPage();
                    break;
                case 38:
                    this.zoom > 1 ? this.moveBook('up') : this.nextPage();
                    break;
                case 39:
                    this.zoom > 1 ? this.moveBook('right') : this.nextPage();
                    break;
                case 33:
                    this.prevPage();
                    break;
                case 34:
                    this.nextPage();
                    break;
                case 36:
                    this.firstPage();
                    break;
                case 35:
                    this.lastPage();
                    break;
                case 40:
                    this.zoom > 1 ? this.moveBook('down') : this.prevPage();
                    break;
            }
            return false;
        };
        this.handleFs = () => this.handleFsChange();

        window.addEventListener('resize', this.handleResize);
        document.addEventListener('keydown', this.handleKeydown);

        document.addEventListener('MSFullscreenChange', this.handleFs);
        document.addEventListener('mozfullscreenchange', this.handleFs);
        document.addEventListener('webkitfullscreenchange', this.handleFs);
        document.addEventListener('fullscreenchange', this.handleFs);
    }

    removeEventListeners() {
        window.removeEventListener('resize', this.handleResize);
        document.removeEventListener('keydown', this.handleKeydown);

        document.removeEventListener('MSFullscreenChange', this.handleFs);
        document.removeEventListener('mozfullscreenchange', this.handleFs);
        document.removeEventListener('webkitfullscreenchange', this.handleFs);
        document.removeEventListener('fullscreenchange', this.handleFs);
    }

    onBookCreated() {
        var o = this.options;

        var self = this;

        var root = document.documentElement;
        root.style.setProperty('--flipbook-link-color', this.options.linkColor);
        root.style.setProperty('--flipbook-link-color-hover', this.options.linkColorHover);
        root.style.setProperty('--flipbook-link-opacity', this.options.linkOpacity);

        this.elemStatic = getComputedStyle(this.elem).position == 'static';

        this.resizeContainer();

        this.addEventListeners();

        this.resizeObserver = new ResizeObserver((entries) => {
            self.resizeContainer();
        });

        this.resizeObserver.observe(this.elem);

        this.resizeObserver2 = new ResizeObserver(() => {
            self.resize();
        });

        this.resizeObserver2.observe(this.bookLayer);

        this.playBgMusic();

        if (o.lightboxCloseOnBack) {
            window.onpopstate = function () {
                if (self.Book.enabled && self.lightbox && self.lightbox.lightboxOpened) {
                    if (!window.location.hash) {
                        self.lightbox.closeLightbox(true);
                    }
                }
            };
        }

        if (this.options.viewMode != 'scroll') {
            this.bookLayer.addEventListener(
                'wheel',
                function (e) {
                    if (e.ctrlKey) {
                        e.preventDefault();
                    }

                    if (!this.Book.enabled) return;

                    if (!this.options.lightBox && !this.fullscreenActive) {
                        if (
                            this.options.wheelDisabledNotFullscreen ||
                            this.bodyHasVerticalScrollbar() ||
                            this.isIframe()
                        ) {
                            return;
                        }
                    }

                    const deltaX = e.deltaX || -e.wheelDeltaX || -e.detail;
                    const deltaY = e.deltaY || -e.wheelDeltaY || -e.detail;

                    if (Math.abs(deltaY) > 0 && Math.abs(deltaY) > Math.abs(deltaX)) {
                        if (deltaY > 0) {
                            this.zoomOut(e);
                        } else {
                            this.zoomIn(e);
                        }
                        return false;
                    }
                }.bind(this),
                { passive: false }
            );
        }

        if (self.options.contentOnStart) {
            this.toggleToc(true);
        } else if (self.options.thumbnailsOnStart) {
            this.options.thumbsStyle = 'side';
            this.toggleThumbs(true);
        } else if (self.options.searchOnStart) {
            this.toggleSearch(true);
            if (typeof this.options.searchOnStart == 'string') {
                const input = this.thumbs.findInput;
                input.value = this.options.searchOnStart;
                const event = new KeyboardEvent('keyup', { bubbles: true });
                input.dispatchEvent(event);
            }
        }

        if (o.autoplayOnStart) {
            this.toggleAutoplay(true);
        }

        this.resize();
        this.Book.zoomTo(o.zoomMin);
        this.updateCurrentPage();

        this.goToPage(Number(o.startPage), true);

        if (o.onbookcreated) {
            o.onbookcreated.call(this);
        }
        this.bookCreated = true;
    }

    initSound() {
        if (this.options.flipSound) {
            this.flipSound = document.createElement('audio');
            this.flipSound.preload = 'auto';

            var flipSource = document.createElement('source');
            flipSource.src = this.options.assets.flipMp3;
            flipSource.type = 'audio/mpeg';
            this.flipSound.appendChild(flipSource);
        }

        if (this.options.backgroundMusic) {
            // Determine the URL
            let bgMusicUrl = null;

            // If it's a string (i.e., a custom URL)
            if (typeof this.options.backgroundMusic === 'string') {
                bgMusicUrl = this.options.backgroundMusic;
            }
            // If it's true/boolean and you have a default mp3 set up in assets
            else if (this.options.assets && this.options.assets.backgroundMp3) {
                bgMusicUrl = this.options.assets.backgroundMp3;
            }

            if (bgMusicUrl) {
                this.backgroundMusic = document.createElement('audio');
                this.backgroundMusic.preload = 'auto';
                this.backgroundMusic.autoplay = true;
                this.backgroundMusic.loop = true;

                var bgMusicSource = document.createElement('source');
                bgMusicSource.src = bgMusicUrl;
                bgMusicSource.type = 'audio/mpeg';
                this.backgroundMusic.appendChild(bgMusicSource);

                // Optionally, append to document to trigger playback on some browsers
                document.body.appendChild(this.backgroundMusic);
            }
        }
    }

    touchSwipe(element, callback) {
        let startX, startY, startTime;
        let lastX, lastY;
        let startDistance;
        let isSwiping = false;
        let isPinching = false;
        let fingerCount = 0;
        let touchStarted = false;

        function calculateDistance(touches) {
            if (touches.length < 2) {
                return 0;
            }
            let dx = touches[0].clientX - touches[1].clientX;
            let dy = touches[0].clientY - touches[1].clientY;
            return Math.sqrt(dx * dx + dy * dy);
        }

        function calculateDirectionAndDistance(currentX, currentY) {
            return {
                distanceX: currentX - startX,
                distanceY: currentY - startY,
            };
        }

        function getTouchObject(e) {
            return e.type.includes('mouse') ? e : e.touches[0];
        }

        var self = this;
        function startHandler(e) {
            if (e.type === 'touchstart') {
                touchStarted = true;
            } else if (e.type === 'mousedown' && touchStarted) {
                return;
            } else if (e.target.tagName === 'A' || e.target.tagName === 'SPAN' || e.target.tagName === 'MARK') {
                self.trigger('disableIScroll');
                return;
            }
            self.trigger('enableIScroll');

            let touchObj = getTouchObject(e);
            startX = touchObj.clientX;
            startY = touchObj.clientY;
            startTime = new Date().getTime();
            isSwiping = true;
            fingerCount = e.touches ? e.touches.length : 1;
            callback(e, 'start', null, 0, 0, fingerCount);
            element.addEventListener('mousemove', moveHandler);
            element.addEventListener('touchmove', moveHandler, { passive: false });
        }

        function moveHandler(e) {
            let touchObj = getTouchObject(e);
            let { distanceX, distanceY } = calculateDirectionAndDistance(touchObj.clientX, touchObj.clientY);

            lastX = touchObj.clientX;
            lastY = touchObj.clientY;

            if (isSwiping && e.type === 'mousemove') {
                e.preventDefault();
                callback(e, 'move', distanceX, distanceY, 0, 1);
            } else if (e.touches && e.touches.length === 2) {
                e.preventDefault();
                let scale;
                if (typeof e.scale === 'number') {
                    scale = e.scale;
                } else {
                    let currentDistance = calculateDistance(e.touches);
                    if (!isPinching) {
                        isPinching = true;
                        startDistance = currentDistance;
                        scale = 1;
                    } else {
                        scale = currentDistance / startDistance;
                    }
                }

                if (isPinching) {
                    callback(e, 'pinch', scale, null, 0, 2);
                } else {
                    isPinching = true;
                    startDistance = calculateDistance(e.touches);
                    callback(e, 'pinchstart', scale, null, 0, 2);
                }
            } else if (e.touches && e.touches.length === 1) {
                if (self.zoom > 1) {
                    e.preventDefault();
                }
                callback(e, 'move', distanceX, distanceY, 0, 1);
            }
        }

        function endHandler(e) {
            self.trigger('enableIScroll');
            if (e.type === 'touchend' || e.type === 'mouseup') {
                setTimeout(function () {
                    touchStarted = false;
                }, 300);
            }

            let touchObj = e.changedTouches ? e.changedTouches[0] : e;
            let { distanceX, distanceY } = calculateDirectionAndDistance(touchObj.clientX, touchObj.clientY);
            let duration = new Date().getTime() - startTime;

            if (isSwiping) {
                isSwiping = false;
                callback(e, 'end', distanceX, distanceY, duration, e.changedTouches ? e.changedTouches.length : 1);
            }

            if (isPinching) {
                isPinching = false;
                callback(e, 'pinchend', null, 0, 0, 2);
            }
            removeEventListeners();
        }

        function cancelHandler(e) {
            setTimeout(function () {
                touchStarted = false;
            }, 300);

            let duration = new Date().getTime() - startTime;
            let { distanceX, distanceY } = calculateDirectionAndDistance(lastX, lastY);

            if (isSwiping) {
                isSwiping = false;
                callback(e, 'cancel', distanceX, distanceY, duration, 1);
            }
            if (isPinching) {
                isPinching = false;
                callback(e, 'pinchcancel', distanceX, distanceY, duration, 2);
            }
            removeEventListeners();
        }

        function removeEventListeners() {
            element.removeEventListener('mousemove', moveHandler);
            element.removeEventListener('touchmove', moveHandler);
        }

        element.addEventListener('mousedown', startHandler);
        element.addEventListener('touchstart', startHandler);
        element.addEventListener('mouseup', endHandler);
        element.addEventListener('touchend', endHandler);
        element.addEventListener('mouseleave', cancelHandler);
        element.addEventListener('touchcancel', cancelHandler);
    }

    initListeners() {
        this.wrapper.addEventListener('pointerdown', (e) => {
            this.deselectText();
        });
    }

    initSwipe() {
        var self = this;

        let zooming = false;
        let pinching = false;
        let textSelect = false;
        this.touchSwipe(this.book, function (e, phase, distanceX, distanceY, duration, fingerCount) {
            textSelect = self.tool == 'toolSelect' || self.options.pageDragDisabled;

            if (phase == 'start') {
                self.zoomStart = self.zoom;
                try {
                    self.currentPageInput.dispatchEvent(new Event('blur', { bubbles: true, cancelable: true }));
                } catch (e) {}
            }

            if (fingerCount > 1 && phase == 'pinch') {
                let scale = distanceX;
                if (e.scale) {
                    scale = e.scale;
                }
                self.zoomTo(self.zoomStart * scale, 0, e);
                pinching = true;
            }

            if (phase == 'end') {
                if (!self.options.doubleClickZoomDisabled) {
                    if (!self.clickTimer) {
                        self.clickTimer = setTimeout(function () {
                            delete self.clickTimer;
                        }, 300);
                    } else {
                        clearTimeout(self.clickTimer);
                        delete self.clickTimer;
                        const pageHtmlClicked = e.target.closest('.flipbook-page-html') !== null;
                        if (pageHtmlClicked) {
                            var t = self.options.zoomTime;
                            if (self.zoom >= self.options.zoomMax) {
                                self.zoomTo(self.options.zoomMin, t, e);
                            } else {
                                self.zoomTo(self.options.zoomMax, t, e);
                            }
                        }
                    }
                }
                if (Math.abs(distanceX) < 5 && duration < 200) {
                    zooming = true;
                }
            }

            if (!zooming && !pinching && !textSelect) {
                self.Book.onSwipe(e, phase, distanceX, distanceY, duration, fingerCount);
            }
            zooming = false;

            if (phase == 'pinchend') {
                pinching = false;
            }
        });

        this.swipeEnabled = true;
    }

    createSVGIcon(name, reverse) {
        var container = document.createElement('div');
        container.innerHTML = FLIPBOOK.Main.icons[name];

        var svgElement = container.firstChild;

        svgElement.setAttribute('aria-hidden', 'true');
        svgElement.classList.add('flipbook-icon');

        if (reverse) {
            svgElement.classList.add('flipbook-icon-reverse');
        }

        return svgElement;
    }

    createButton(btn) {
        var o = this.options;
        var inToolsMenu = btn.toolsMenu && o.btnTools.enabled;
        var floating =
            !inToolsMenu &&
            ((btn.vAlign === 'top' && o.menu2Transparent) || (btn.vAlign !== 'top' && o.menuTransparent));
        var bgColor = btn.background || (floating ? o.floatingBtnBackground : o.btnBackground);
        var bgColorHover = btn.backgroundHover || (floating ? o.floatingBtnBackgroundHover : o.btnBackgroundHover);
        var color = btn.color || (floating ? o.floatingBtnColor : o.btnColor);
        var colorHover = btn.colorHover || (floating ? o.floatingBtnColorHover : o.btnColorHover);
        var textShadow = floating ? o.floatingBtnTextShadow : o.btnTextShadow;
        var radius = btn.radius || (floating ? o.floatingBtnRadius : o.btnRadius);
        var border = btn.border || (floating ? o.floatingBtnBorder : o.btnBorder);
        var margin = floating ? o.floatingBtnMargin : o.btnMargin;
        var paddingV = o.btnPaddingV + 4;
        var paddingH = o.btnPaddingH + 4;
        var $btn = document.createElement('span');
        var btnSize = btn.size || o.btnSize;

        if (inToolsMenu) {
            bgColor = 'none';
            bgColorHover = 'none';
        }

        function addCSS(btn) {
            btn.style.margin = `${margin}px`;
            btn.style.padding = `${paddingV}px ${paddingH}px`;
            btn.style.borderRadius = `${radius}px`;
            btn.style.boxShadow = o.btnShadow;
            btn.style.border = border;
            btn.style.color = color;
            btn.$icon.style.fill = color;
            if (btn.$iconAlt) btn.$iconAlt.style.fill = color;
            btn.style.background = bgColor;
            btn.style.textShadow = textShadow;
            btn.style.width = `${btnSize}px`;
            btn.style.height = `${btnSize}px`;

            if (color) {
                btn.classList.remove('skin-color');
            }
            if (bgColor) {
                btn.classList.remove('skin-color-bg');
            }
        }

        const iconName = btn.svg || btn.name.replace('btn', '').toLowerCase();

        $btn.$icon = this.createSVGIcon(iconName, btn.iconReverse);
        $btn.appendChild($btn.$icon);

        if (btn.svgAlt) {
            $btn.$iconAlt = this.createSVGIcon(btn.svgAlt, btn.iconReverse);
            $btn.appendChild($btn.$iconAlt);
            $btn.$iconAlt.classList.add('flipbook-hidden');
        }

        addCSS($btn);

        if (btn.onclick) {
            $btn.addEventListener('click', function () {
                btn.onclick();
            });
        }

        if (colorHover || bgColorHover) {
            $btn.addEventListener('mouseenter', function () {
                if (this.classList.contains('disabled')) return;
                $btn.$icon.style.fill = colorHover;
                $btn.$icon.style.background = bgColorHover;
                if ($btn.$iconAlt) {
                    $btn.$iconAlt.style.fill = colorHover;
                    $btn.$iconAlt.style.background = bgColorHover;
                }
            });

            $btn.addEventListener('mouseleave', function () {
                $btn.$icon.style.fill = color;
                $btn.$icon.style.background = bgColor;
                if ($btn.$iconAlt) {
                    $btn.$iconAlt.style.fill = color;
                    $btn.$iconAlt.style.background = bgColor;
                }
            });
        }

        var menu;

        if (inToolsMenu) {
            menu = this.toolsMenu;
            var span = document.createElement('span');
            span.textContent = btn.title;
            span.classList.add('skin-color');
            $btn.appendChild(span);
        } else if (btn.vAlign === 'top') {
            if (o.menu2Floating) {
                menu = this.menuTC;
            } else if (btn.hAlign === 'left') {
                menu = this.menuTL;
            } else if (btn.hAlign === 'right') {
                menu = this.menuTR;
            } else {
                menu = this.menuTC;
            }
        } else {
            if (o.menuFloating) {
                menu = this.menuBC;
            } else if (btn.hAlign === 'left') {
                menu = this.menuBL;
            } else if (btn.hAlign === 'right') {
                menu = this.menuBR;
            } else {
                menu = this.menuBC;
            }
        }

        $btn.setAttribute('data-name', btn.name);
        $btn.classList.add('flipbook-menu-btn-wrapper', 'flipbook-menu-btn', 'skin-color');
        $btn.style.order = btn.order;
        menu.appendChild($btn);

        if (!inToolsMenu) {
            $btn.setAttribute('data-tooltip', btn.title);
            $btn.classList.add('flipbook-has-tooltip');
        }

        return $btn;
    }

    createAndAppendMenu(className, parentElement) {
        const div = document.createElement('div');
        div.className = className;
        parentElement.appendChild(div);
        return div;
    }

    initArrowButton(button, onclick) {
        const o = this.options;

        button.addEventListener('click', (e) => {
            if (button.disabled) return false;

            button.disabled = true;
            setTimeout(() => {
                button.disabled = false;
            }, 300);

            e.stopPropagation();
            e.preventDefault();
            onclick();
        });

        Object.assign(button.style, {
            width: `${o.arrowSize}px`,
            borderRadius: `${o.arrowRadius}px`,
            padding: `${o.arrowPadding}px`,
            filter: `drop-shadow(${o.arrowTextShadow})`,
            border: o.arrowBorder,
            color: o.arrowColor,
            fill: o.arrowColor,
            background: o.arrowBackground,
            boxSizing: 'initial',
        });

        if (o.arrowBackgroundHover) {
            button.addEventListener('mouseenter', function () {
                if (this.classList.contains('disabled')) return;
                button.style.background = o.arrowBackgroundHover;
            });
            button.addEventListener('mouseleave', function () {
                button.style.background = o.arrowBackground;
            });
        }

        if (o.arrowColor) {
            button.classList.remove('skin-color');
        }
        if (o.arrowBackground) {
            button.classList.remove('skin-color-bg');
        }
    }

    createMenu() {
        if (this.menuBottom) {
            return;
        }

        var o = this.options;

        var menuBottomClass = o.menuFloating ? 'flipbook-menu-floating' : 'flipbook-menu-fixed';
        var menuTopClass = o.menu2Floating ? 'flipbook-menu-floating' : 'flipbook-menu-fixed';

        var self = this;

        this.menuBottom = document.createElement('div');
        this.menuBottom.classList.add('flipbook-menuBottom', menuBottomClass);
        if (!o.menuTransparent && o.skin !== 'gradient') this.menuBottom.classList.add('flipbook-border');
        this.menuBottom.style.background = o.menuBackground;
        this.menuBottom.style.boxShadow = o.menuShadow;
        this.menuBottom.style.margin = o.menuMargin + 'px';
        this.menuBottom.style.padding = o.menuPadding + 'px';
        this.wrapper.appendChild(this.menuBottom);

        if (!o.menuTransparent && !o.menuBackground) {
            this.menuBottom.classList.add('skin-color-bg');
        }

        if (o.hideMenu) {
            this.menuBottom.classList.add('flipbook-hidden');
        }

        this.menuTop = document.createElement('div');
        this.menuTop.classList.add('flipbook-menuTop', menuTopClass);
        if (!o.menu2Transparent && o.skin !== 'gradient') this.menuTop.classList.add('flipbook-border');
        this.menuTop.style.background = o.menu2Background;
        this.menuTop.style.boxShadow = o.menu2Shadow;
        this.menuTop.style.margin = o.menu2Margin + 'px';
        this.menuTop.style.padding = o.menu2Padding + 'px';
        this.wrapper.appendChild(this.menuTop);

        if (!o.menu2Transparent && !o.menu2Background) {
            this.menuTop.classList.add('skin-color-bg');
        }

        if (o.viewMode === 'swipe') {
            o.btnSound.enabled = false;
        }

        function createAndAppendMenu(className, parentElement) {
            const div = document.createElement('div');
            div.className = className;
            parentElement.appendChild(div);
            return div;
        }

        if (o.progressBar.enabled && o.progressBar.vAlign === 'bottom') {
            // new FLIPBOOK.ProgressBar({wrapper:this.menuBottom})
        }
        // this.progress = createAndAppendMenu('flipbook-progress', this.menuBottom);

        this.menuBL = createAndAppendMenu('flipbook-menu flipbook-menu-left', this.menuBottom);
        this.menuBC = createAndAppendMenu('flipbook-menu flipbook-menu-center', this.menuBottom);
        this.menuBR = createAndAppendMenu('flipbook-menu flipbook-menu-right', this.menuBottom);

        this.menuTL = createAndAppendMenu('flipbook-menu flipbook-menu-left', this.menuTop);
        this.menuTC = createAndAppendMenu('flipbook-menu flipbook-menu-center', this.menuTop);
        this.menuTR = createAndAppendMenu('flipbook-menu flipbook-menu-right', this.menuTop);

        if (this.options.btnTools.enabled) {
            this.toolsMenu = document.createElement('div');
            this.toolsMenu.className =
                'flipbook-tools flipbook-submenu skin-color skin-color-bg flipbook-font flipbook-border';
        }

        if (this.options.btnShare.enabled) {
            this.shareMenu = document.createElement('div');
            this.shareMenu.className =
                'flipbook-share flipbook-submenu skin-color skin-color-bg flipbook-font flipbook-border';
        }

        if (o.sideNavigationButtons) {
            this.$arrowWrapper = document.createElement('div');
            this.$arrowWrapper.className = 'flipbook-nav';
            this.bookLayer.appendChild(this.$arrowWrapper);

            this.btnNext = this.createSVGIcon('next');
            this.$arrowWrapper.appendChild(this.btnNext);
            this.btnNext.style.height = o.arrowSize + 'px';
            this.btnNext.style.fontSize = o.arrowSize + 'px';
            this.btnNext.style.marginTop = String(-o.arrowSize / 2) + 'px';
            this.btnNext.style.marginRight = o.arrowMargin + 'px';
            this.btnNext.classList.add('flipbook-right-arrow');
            this.initArrowButton(this.btnNext, this.nextPage.bind(this));

            this.btnPrev = this.createSVGIcon('next', true);
            this.$arrowWrapper.appendChild(this.btnPrev);
            this.btnPrev.style.height = o.arrowSize + 'px';
            this.btnPrev.style.fontSize = o.arrowSize + 'px';
            this.btnPrev.style.marginTop = String(-o.arrowSize / 2) + 'px';
            this.btnPrev.style.marginLeft = o.arrowMargin + 'px';
            this.btnPrev.classList.add('flipbook-left-arrow');
            this.initArrowButton(this.btnPrev, this.prevPage.bind(this));

            if (o.btnFirst.enabled) {
                this.btnFirst = this.createSVGIcon('last', true);
                this.$arrowWrapper.appendChild(this.btnFirst);
                this.btnFirst.style.height = o.arrowSize * 0.5 + 'px';
                this.btnFirst.style.fontSize = o.arrowSize * 0.5 + 'px';
                this.btnFirst.style.marginTop = String(o.arrowSize / 2 + o.arrowMargin + 2 * o.arrowPadding) + 'px';
                this.btnFirst.style.marginLeft = o.arrowMargin + 'px';
                this.btnFirst.classList.add('flipbook-first-arrow');
                this.initArrowButton(this.btnFirst, this.firstPage.bind(this));
            }

            if (o.btnLast.enabled) {
                this.btnLast = this.createSVGIcon('last');
                this.$arrowWrapper.appendChild(this.btnLast);
                this.btnLast.style.height = o.arrowSize * 0.5 + 'px';
                this.btnLast.style.fontSize = o.arrowSize * 0.5 + 'px';
                this.btnLast.style.marginTop = String(o.arrowSize / 2 + o.arrowMargin + 2 * o.arrowPadding) + 'px';
                this.btnLast.style.marginRight = o.arrowMargin + 'px';
                this.btnLast.classList.add('flipbook-last-arrow');
                this.initArrowButton(this.btnLast, this.lastPage.bind(this));
            }

            if (!o.menuNavigationButtons) {
                if (o.btnOrder.indexOf('btnFirst') >= 0) {
                    o.btnOrder.splice(o.btnOrder.indexOf('btnFirst'), 1);
                }
                if (o.btnOrder.indexOf('btnPrev') >= 0) {
                    o.btnOrder.splice(o.btnOrder.indexOf('btnPrev'), 1);
                }
                if (o.btnOrder.indexOf('btnNext') >= 0) {
                    o.btnOrder.splice(o.btnOrder.indexOf('btnNext'), 1);
                }
                if (o.btnOrder.indexOf('btnLast') >= 0) {
                    o.btnOrder.splice(o.btnOrder.indexOf('btnLast'), 1);
                }
            }
        }

        if (o.pdfMode && !o.btnDownloadPdf.url) {
            o.btnDownloadPdf.url = o.pdfUrl;
        }

        if (!o.btnDownloadPdf.url) o.btnDownloadPdf.enabled = false;

        if (!o.pdfTextLayer && o.btnSearch) {
            o.btnSearch.enabled = false;
        }

        const isInIframe = window.self !== window.top;
        if (isInIframe) o.btnDownloadPages.enabled = false;

        
        o.btnOrder = [
                'currentPage',
                'progressBar',
                'btnZoomOut',
                'btnZoomIn',
                'btnThumbs',
                'btnToc',
                'btnShare',
                'btnPrint',
                'btnDownloadPdf',
                'btnSound',
                'btnTools',
                'btnExpand',
                'btnClose',
            ];
            

        var tools = [];
        for (var i = 0; i < o.btnOrder.length; i++) {
            var btnName = o.btnOrder[i];
            var btn = o[btnName];

            if (o.isMobile && btn.hideOnMobile) {
                btn.enabled = false;
            }
            if (btn.toolsMenu && btn.enabled) tools.push(btn);
        }
        if (tools.length <= 1) o.btnTools.enabled = false;

        for (var i = 0; i < o.btnOrder.length; i++) {
            var btnName = o.btnOrder[i];
            var btn = o[btnName];

            if (btn.enabled) {
                btn.name = btnName;
                if (btn.name === 'currentPage') {
                    this.createCurrentPage();
                } else if (btn.name === 'progressBar') {
                    // append div to menu bottom
                } else if (btn.name === 'search') {
                    } else {
                    this[btnName] = this.createButton(btn);
                    this[btnName].addEventListener('click', function (e) {
                        var name = this.dataset.name;
                        if (name == 'btnDownloadPdf') {
                            const isInIframe = window.self !== window.top;
                            if (!isInIframe) {
                                var path = o.btnDownloadPdf.url;
                                var save = document.createElement('a');
                                save.href = path;
                                var filename = save.href.split('/').pop().split('#')[0].split('?')[0];
                                save.download = filename;
                                document.body.appendChild(save);
                                save.click();
                                document.body.removeChild(save);
                            } else {
                                parent.postMessage(
                                    {
                                        type: 'download',
                                        url: o.btnDownloadPdf.url,
                                    },
                                    '*'
                                );
                            }
                            self.sendGAEvent({
                                event: 'flipbook_pdf_download',
                                book_name: self.options.name,
                                url: o.btnDownloadPdf.url || o.pdfUrl,
                                nonInteraction: true,
                            });
                        } else {
                            e.stopPropagation();
                            e.preventDefault();
                            self.onButtonClick(this, e);
                        }
                    });
                }
            }
        }

        if (o.buttons) {
            o.buttons.forEach((newButton) => {
                self.createButton(newButton).index(1);
            });
        }

        if (this.btnSingle) this.toggleIcon(this.btnSingle, this.options.singlePageMode);
    }

    onButtonClick(btn, _) {
        var name = btn.dataset.name;
        var o = this.options;

        switch (name) {
            case 'btnFirst':
                this.firstPage();
                break;
            case 'btnPrev':
                this.prevPage();
                break;
            case 'btnNext':
                this.nextPage();
                break;
            case 'btnLast':
                this.lastPage();
                break;
            case 'btnZoomIn':
                this.zoomIn();
                break;
            case 'btnZoomOut':
                this.zoomOut();
                break;
            case 'btnAutoplay':
                if (!this.autoplay) {
                    this.nextPage();
                }
                this.toggleAutoplay();
                break;
            case 'btnSearch':
                this.toggleSearch();
                break;
            case 'btnBookmark':
                this.toggleBookmark();
                break;
            case 'btnRotateLeft':
                if (this.Book.rotateLeft) {
                    this.Book.rotateLeft();
                }
                break;
            case 'btnRotateRight':
                if (this.Book.rotateRight) {
                    this.Book.rotateRight();
                }
                break;
            case 'btnToc':
                this.toggleToc();
                break;
            case 'btnThumbs':
                this.toggleThumbs();
                break;
            case 'btnShare':
                this.toggleShareMenu();
                break;
            case 'btnTools':
                this.toggleToolsMenu();
                break;
            case 'btnNotes':
                this.toggleNotesMenu();
                break;
            case 'btnDownloadPages':
                if (o.downloadMenu) {
                    this.toggleDownloadMenu();
                } else {
                    var link = document.createElement('a');
                    link.href = o.pdfUrl || o.btnDownloadPages.url;
                    link.dispatchEvent(new MouseEvent('click'));
                }

                break;

            case 'btnPrint':
                if (o.printMenu) {
                    this.togglePrintMenu();
                } else {
                    this.togglePrintWindow();
                }

                break;

            case 'btnSound':
                this.toggleSound();
                break;
            case 'btnExpand':
                this.toggleExpand();
                break;
            case 'btnSingle':
                this.toggleSinglePage();
                break;
            case 'btnClose':
                this.lightbox.closeLightbox();
                break;
        }
    }

    handleFsChange() {
        if (!this.Book || !this.Book.enabled) {
            return;
        }

        var currentFullscreenElement =
            document.fullscreenElement ||
            document.webkitFullscreenElement ||
            document.mozFullScreenElement ||
            document.msFullscreenElement;
        if (currentFullscreenElement === this.fullscreenElement || this.isFullscreen) {
            this.fullscreenActive = true;

            if (this.options.onfullscreenenter) {
                this.options.onfullscreenenter.call(this);
            }
            document.body.classList.add('flipbook-fullscreen');
        } else {
            this.fullscreenActive = false;
            if (this.options.onfullscreenexit) {
                this.options.onfullscreenexit.call(this);
            }
            document.body.classList.remove('flipbook-fullscreen');
        }

        this.toggleIcon(this.btnExpand, !this.fullscreenActive);
    }

    createLogo() {
        const { options: o, wrapper } = this;
        const { logoImg, logoCSS, logoAlignH, logoAlignV, logoUrl, logoUrlTarget, isMobile, logoHideOnMobile } = o;

        if (!logoImg || (isMobile && logoHideOnMobile)) return;

        const baseStyle =
            `${logoCSS}` +
            [
                'position:absolute',
                logoAlignH === 'right' ? 'right:0' : logoAlignH === 'left' ? 'left:0' : '',
                logoAlignV === 'bottom' ? 'bottom:0' : logoAlignV === 'top' ? 'top:0' : '',
            ]
                .filter(Boolean)
                .join(';') +
            ';';

        const makeLogo = ({ zIndex = '', opacity = '' } = {}) => {
            const img = document.createElement('img');
            img.src = logoImg;
            img.style.cssText =
                baseStyle + (zIndex ? `z-index:${zIndex};` : '') + (opacity ? `opacity:${opacity};` : '');

            if (logoUrl) {
                img.style.cursor = 'pointer';
                img.addEventListener('click', (e) => {
                    e.preventDefault();
                    e.stopPropagation();
                    window.open(logoUrl, logoUrlTarget || '_blank');
                });
            }

            return img;
        };

        const primary = makeLogo();
        wrapper.appendChild(primary);
    }

    setLoadingProgress(percent) {
        if (this.disposed) {
            return;
        }

        if (this.$fillPreloader) {
            this.setFillPreloaderProgress(percent);
        } else {
            if (percent > 0 && percent < 1) {
                this.preloader.classList.remove('flipbook-hidden');
            } else {
                this.preloader.classList.add('flipbook-hidden');
            }
        }
    }

    setFillPreloaderProgress(percent) {
        if (!this.$fillPreloader) {
            return;
        }

        if (percent > 0 && percent < 1) {
            this.fillPreloaderProgress = this.fillPreloaderProgress || 0;

            if (percent < this.fillPreloaderProgress) {
                return;
            } else {
                this.fillPreloaderProgress = percent;
            }
            var img = this.$fillPreloaderImg[0];
            img.style.clip = 'rect(0px,' + img.width * percent + 'px,' + img.height + 'px,0px)';
            this.$fillPreloader.show();
        } else {
            this.$fillPreloader.hide();
        }
    }

    playFlipSound() {
        if (this.options.sound && this.Book.enabled && typeof this.flipSound.play != 'undefined') {
            this.flipSound.currentTime = 0;

            var self = this;

            setTimeout(function () {
                self.flipSound.play().then(
                    function () {},
                    function () {}
                );
            }, 150);
        }
    }

    playBgMusic(retry = true) {
        if (!this.options.sound || !this.backgroundMusic) return;

        const attemptPlay = () => {
            const playPromise = this.backgroundMusic.play();
            if (playPromise && typeof playPromise.catch === 'function') {
                playPromise.catch((e) => {
                    if (retry && e && (e.name === 'NotAllowedError' || e.message?.includes('user'))) {
                        setTimeout(attemptPlay, 200); // Retry after 200ms
                    }
                });
            }
        };

        attemptPlay();
    }

    onMouseWheel(e) {
        if ('wheelDeltaX' in e) {
            wheelDeltaX = e.wheelDeltaX / 12;
            wheelDeltaY = e.wheelDeltaY / 12;
        } else if ('wheelDelta' in e) {
            wheelDeltaX = wheelDeltaY = e.wheelDelta / 12;
        } else if ('detail' in e) {
            wheelDeltaX = wheelDeltaY = -e.detail * 3;
        } else {
            return;
        }
        if (wheelDeltaX > 0) {
            this.zoomIn(e);
        } else {
            this.zoomOut(e);
        }
    }

    zoomTo(val, time, e) {
        this.zoom = val;

        var x;
        var y;

        if (typeof e == 'undefined') {
            x = this.wrapperW / 2;
            y = this.wrapperH / 2;
        } else {
            if (e.touches && e.touches[0]) {
                x = e.touches[0].pageX;
                y = e.touches[0].pageY;
            } else if (e.changedTouches && e.changedTouches[0]) {
                x = e.changedTouches[0].pageX;
                y = e.changedTouches[0].pageY;
            } else {
                x = e.pageX;
                y = e.pageY;
            }

            let wrapperRect = this.wrapper.getBoundingClientRect();
            x = x - wrapperRect.left - window.scrollX;
            y = y - wrapperRect.top - window.scrollY;
        }

        const zoomMin = this.getZoomMin();

        if (this.zoom < zoomMin) {
            this.zoom = zoomMin;
        }
        if (this.zoom > this.options.zoomMax) {
            this.zoom = this.options.zoomMax;
        }

        if (this.options.zoomMax2 && this.zoom > this.options.zoomMax2) {
            this.zoom = this.options.zoomMax2;
        }

        this.Book.zoomTo(this.zoom, time, x, y);

        this.onZoom(this.zoom);
    }

    zoomOut(e) {
        var newZoom = this.zoom / this.options.zoomStep;
        // if (newZoom < 1 && this.zoom > 1) {
        //     newZoom = 1;
        // }
        const zoomMin = this.getZoomMin();
        newZoom = newZoom < zoomMin ? zoomMin : newZoom;

        if (this.zoom == newZoom) {
            return;
        }

        this.zoom = newZoom;

        this.zoomTo(this.zoom, this.options.zoomTime, e);
    }

    zoomIn(e) {
        var newZoom = this.zoom * this.options.zoomStep;
        // if (newZoom > 1 && this.zoom < 1) {
        //     newZoom = 1;
        // }

        if (newZoom > this.options.zoomMax) {
            newZoom = this.options.zoomMax;
        }

        if (this.zoom == newZoom) {
            return;
        }

        this.zoom = newZoom;

        this.zoomTo(this.zoom, this.options.zoomTime, e);
    }

    getZoomMin() {
        return this.options.viewMode == 'scroll' ? this.options.zoomMin2 : this.options.zoomMin;
    }

    deselectText() {
        window.getSelection().removeAllRanges();
    }

    nextPage() {
        if (!this.Book) {
            return;
        }
        this.flippingPage = true;
        if (this.Book.canFlipNext()) {
            this.Book.nextPage();
            this.deselectText();
        }
    }

    prevPage() {
        if (!this.Book) {
            return;
        }
        this.flippingPage = true;
        if (this.Book.canFlipPrev()) {
            this.Book.prevPage();
            this.deselectText();
        }
    }

    firstPage() {
        this.goToPage(1);
    }

    lastPage() {
        this.goToPage(this.options.pages.length);
    }

    goToPage(pageNumber, instant) {
        if (!this.Book) {
            return;
        }
        var o = this.options;
        pageNumber = o.rightToLeft && o.pages && o.pages.length ? o.pages.length - pageNumber + 1 : pageNumber;
        pageNumber = o.rightToLeft && !o.backCover ? pageNumber + 1 : pageNumber;

        if (!instant) {
            this.flippingPage = true;
        }

        if (!this.options.cover) {
            pageNumber++;
        }

        if (pageNumber < 1) {
            pageNumber = 1;
        } else if (pageNumber > this.options.numPages && !this.options.rightToLeft) {
            pageNumber = this.options.numPages;
        }

        this.Book.goToPage(pageNumber, instant);
        this.deselectText();
    }

    moveBook(direction) {
        if (this.Book && this.Book.move) {
            this.Book.move(direction);
        }
    }

    onZoom(newZoom) {
        this.zoom = newZoom;
        const zoomMin = this.getZoomMin();
        this.enableButton(this.btnZoomIn, newZoom < this.options.zoomMax);
        this.enableButton(this.btnZoomOut, newZoom > zoomMin);
        this.enableSwipe(newZoom <= 1);

        this.sendGAEvent({
            event: 'flipbook_zoom',
            book_name: this.options.name,
            page_number: this.currentPageValue,
            zoom: newZoom,
            nonInteraction: true,
        });
    }

    enableSwipe(val) {
        this.swipeEnabled = val;
    }

    createCurrentPage() {
        var self = this;
        var o = this.options;
        var menu;
        var cssClass = 'flipbook-currentPageHolder ';

        if (o.currentPage.vAlign == 'top') {
            if (o.currentPage.hAlign == 'left') {
                menu = this.menuTL;
            } else if (o.currentPage.hAlign == 'right') {
                menu = this.menuTR;
            } else {
                menu = this.menuTC;
            }
        } else {
            if (o.currentPage.hAlign == 'left') {
                menu = this.menuBL;
            } else if (o.currentPage.hAlign == 'right') {
                menu = this.menuBR;
            } else {
                menu = this.menuBC;
            }
        }

        var floating =
            (o.currentPage.vAlign == 'top' && o.menu2Transparent) ||
            (o.currentPage.vAlign != 'top' && o.menuTransparent);
        var bgColor = floating ? o.floatingBtnBackground : '';
        var color = floating ? o.floatingBtnColor : o.btnColor;
        var textShadiw = floating ? o.floatingBtnTextShadow : '';
        var radius = floating ? o.floatingBtnRadius : o.btnRadius;
        var currentPageHolder = document.createElement('div');
        menu.appendChild(currentPageHolder);

        currentPageHolder.style.margin = o.currentPage.marginV + 'px ' + o.currentPage.marginH + 'px';
        currentPageHolder.style.height = o.btnSize + 'px';
        currentPageHolder.style.padding = o.btnPaddingV + 'px';

        if (!floating) {
            cssClass += ' skin-color';
        }
        currentPageHolder.className = cssClass;
        currentPageHolder.style.color = color;
        currentPageHolder.style.background = bgColor;
        currentPageHolder.style.textShadow = textShadiw;
        currentPageHolder.style.borderRadius = radius + 'px';

        if (o.currentPage.order) {
            currentPageHolder.style.order = o.currentPage.order;
        }

        this.currentPageHolder = currentPageHolder;

        var form = document.createElement('form');
        currentPageHolder.appendChild(form);

        form.addEventListener('submit', function (e) {
            e.preventDefault();
            var value = parseInt(self.currentPageInput.value, 10);

            value = Math.min(value, o.pages.length);
            value += self.options.pageNumberOffset;
            self.goToPage(value);
            return false;
        });

        this.currentPageInput = document.createElement('input');
        this.currentPageInput.type = 'text';
        this.currentPageInput.className = 'flipbook-currentPageInput';
        this.currentPageInput.style.margin = o.currentPage.marginV + 'px ' + o.currentPage.marginH + 'px';
        this.currentPageInput.style.color = color;

        this.currentPageInput.addEventListener('focus', function () {
            self.currentPageInput.value = '';
        });

        this.currentPageInput.addEventListener('blur', function () {
            self.currentPageInput.value = self.currentPageString;
        });

        form.appendChild(this.currentPageInput);

        var digits = String(o.numPages).length;
        this.currentPageInput.classList.add('digits-' + digits);
        this.currentPageInput.setAttribute('maxlength', digits);

        this.currentPage = document.createElement('div');
        this.currentPage.className = 'flipbook-currentPageNumber';
        currentPageHolder.appendChild(this.currentPage);

        if (!floating) {
            this.currentPageInput.classList.add('skin-color');
        }
    }

    createMenuHeader(el, title, _) {
        var header = document.createElement('div');
        header.className = 'flipbook-menu-header skin-clor flipbook-font';
        el.appendChild(header);

        var titleSpan = document.createElement('span');
        titleSpan.textContent = title;
        titleSpan.className = 'flipbook-menu-title skin-color';
        header.appendChild(titleSpan);

        var btnClose = document.createElement('span');
        btnClose.className = 'flipbook-btn-close skin-color';
        header.appendChild(btnClose);
        btnClose.addEventListener('click', (e) => {
            e.stopPropagation();
            e.preventDefault();
            this.closeMenus();
        });

        var closeIcon = this.createSVGIcon('close');
        btnClose.appendChild(closeIcon);
    }

    createToc() {
        var tocArray = this.options.tableOfContent;

        this.tocHolder = document.createElement('div');
        this.tocHolder.className = 'flipbook-tocHolder flipbook-side-menu skin-color-bg flipbook-border';
        this.wrapper.appendChild(this.tocHolder);
        this.tocHolder.style[this.options.sideMenuPosition] = '0';
        this.tocHolder.classList.add('flipbook-hidden');

        this.createMenuHeader(this.tocHolder, this.strings.tableOfContent, this.toggleToc);

        this.toc = document.createElement('div');
        this.toc.className = 'flipbook-toc';
        this.tocHolder.appendChild(this.toc);

        var arr = this.options.pages;

        if (!tocArray || !tocArray.length) {
            tocArray = [];
            for (var i = 0; i < arr.length; i++) {
                if (arr[i].title) {
                    tocArray.push({
                        title: arr[i].title,
                        page: String(i + 1),
                        pageNumberDisplay: arr[i].name,
                    });
                }
            }
        }

        for (var i = 0; i < tocArray.length; i++) {
            if (arr[i] && arr[i].name && tocArray[i].page) {
                tocArray[i].pageNumberDisplay = arr[tocArray[i].page - 1].name;
            }
        }

        var iconExpand = this.createSVGIcon('next');

        this.tocScroller = this.buildTOC(tocArray);
        this.tocScroller.className = 'flipbook-toc-scroller';
        this.toc.appendChild(this.tocScroller);

        this.tocCreated = true;
        this.toggleToc();
    }

    buildTOC(items) {
        const self = this;
        const ul = document.createElement('ul');
        const expandSvg = this.createSVGIcon('next');

        items.forEach((item) => {
            const li = document.createElement('li');

            const itemDiv = document.createElement('div');
            itemDiv.classList.add('toc-item', 'skin-color');

            const titleContainer = document.createElement('div');
            titleContainer.classList.add('title-container');

            if (item.items && item.items.length > 0) {
                const expandIcon = document.createElement('span');
                expandIcon.classList.add('expand-icon');

                expandIcon.innerHTML = expandSvg.outerHTML;

                expandIcon.addEventListener('click', function (event) {
                    event.stopPropagation();
                    const subUl = li.querySelector('ul');
                    if (subUl.style.display === 'none') {
                        subUl.style.display = 'block';
                        expandIcon.classList.add('expanded');
                    } else {
                        subUl.style.display = 'none';
                        expandIcon.classList.remove('expanded');
                    }
                });

                titleContainer.appendChild(expandIcon);
            } else {
                const spacer = document.createElement('span');
                spacer.classList.add('spacer');
                spacer.innerHTML = '&nbsp;';
                titleContainer.appendChild(spacer);
            }

            const titleSpan = document.createElement('span');
            titleSpan.textContent = item.title;
            titleSpan.classList.add('title');
            titleContainer.appendChild(titleSpan);

            itemDiv.appendChild(titleContainer);

            const pageSpan = document.createElement('span');
            pageSpan.textContent = item.pageNumberDisplay || item.page;
            pageSpan.classList.add('page-number');
            itemDiv.appendChild(pageSpan);

            itemDiv.addEventListener('click', function (e) {
                e.stopPropagation();
                e.preventDefault();

                if (self.options.tableOfContentCloseOnClick) {
                    self.toggleToc(false);
                }

                if (!item.page && item.dest) {
                    if (typeof item.dest === 'string') {
                        self.pdfService.pdfDocument.getDestination(item.dest).then(function (destArray) {
                            self.goToDest(destArray);
                        });
                    } else {
                        self.goToDest(item.dest);
                    }
                } else {
                    var targetPage = Number(item.page);

                    setTimeout(function () {
                        self.goToPage(targetPage);
                    }, 200);
                }
            });

            li.appendChild(itemDiv);

            if (item.items && item.items.length > 0) {
                const subUl = this.buildTOC(item.items);
                subUl.style.display = 'none';
                li.appendChild(subUl);
            }

            ul.appendChild(li);
        });

        return ul;
    }

    goToDest(destArray) {
        }

    enablePrev(val) {
        if (this.prevEnabled == val || !this.btnPrev) return;
        this.enableButton(this.btnPrev, val);
        this.enableButton(this.btnFirst, val);
        this.prevEnabled = val;
        this.Book.enablePrev(val);
    }

    enableNext(val) {
        if (this.nextEnabled == val || !this.btnNext) return;
        this.enableButton(this.btnNext, val);
        this.enableButton(this.btnLast, val);
        this.nextEnabled = val;
        this.Book.enableNext(val);
    }

    enableButton(button, enabled) {
        if (typeof button === 'undefined') {
            return;
        }

        if (enabled) {
            button.classList.remove('disabled');
        } else {
            button.classList.add('disabled');
        }

        button.enabled = enabled;
    }

    resize(force) {
        var o = this.options;

        this.updateWrapperDimensions();

        if (!this.Book || !this.Book.enabled) {
            return;
        }

        // if (o.viewMode == 'webgl') {
        //     o.menuOverBook = true;
        //     o.menu2OverBook = true;
        // }

        if (this.menuShowing) {
            this.bookLayer.style.bottom =
                !o.menuOverBook && this.menuBottom ? this.menuBottom.offsetHeight + 'px' : '0px';
            this.bookLayer.style.top = !o.menu2OverBook && this.menuTop ? this.menuTop.offsetHeight + 'px' : '0px';
        }

        if (this.tocShowing || this.thumbsShowing || this.searchShowing || this.bookmarkShowing) {
            var sidebarWdith = this.tocShowing
                ? this.tocHolder.getBoundingClientRect().width
                : this.thumbsShowing && this.options.thumbsStyle === 'overlay'
                  ? 0
                  : this.thumbs.thumbHolder.getBoundingClientRect().width;

            this.bookLayer.style[this.options.sideMenuPosition] = `${sidebarWdith}px`;
            let sideMenuCss = { bottom: '0px', top: '0px' };
            if (!o.sideMenuOverMenu) {
                sideMenuCss.bottom = this.menuBottom.offsetHeight + 'px';
            }
            if (!o.sideMenuOverMenu2) {
                sideMenuCss.top = this.menuTop.offsetHeight + 'px';
            }

            var sideMenus = this.wrapper.querySelectorAll('.flipbook-side-menu');

            sideMenus.forEach(function (element) {
                for (var property in sideMenuCss) {
                    if (sideMenuCss.hasOwnProperty(property)) {
                        element.style[property] = sideMenuCss[property];
                    }
                }
            });
        } else {
            this.bookLayer.style[this.options.sideMenuPosition] = '0px';
        }

        this.adjustZoomLimits();

        this.Book.onResize(force);
        // if (o.zoomReset) {
        this.Book.zoomTo(o.zoomMin);
        // }
    }

    updateWrapperDimensions() {
        let rect = this.bookLayer.getBoundingClientRect();
        this.wrapperW = rect.width;
        this.wrapperH = rect.height;
    }

    adjustZoomLimits() {
        var o = this.options;
        var wrapperRatio = this.wrapperW / this.wrapperH;
        var pageRatio = this.pageW / this.pageH;
        var bookRatio = 2 * pageRatio;

        var menuTopHeight = this.menuTop.offsetHeight;
        var menuBottomHeight = this.menuBottom.offsetHeight;
        var manuHeight = Math.max(menuTopHeight, menuBottomHeight);
        var bookMargin = o.bookMargin || 20;

        if (o.menuOverBook && o.menu2OverBook)
            o.zoomMin = (this.wrapperH - 2 * manuHeight - bookMargin) / this.wrapperH;
        // else o.zoomMin = (this.wrapperH - bookMargin) / this.wrapperH;

        if (o.viewMode == 'scroll') {
            o.zoomMax = (2 * ((o.zoomSize * o.pageWidth) / o.pageHeight)) / this.wrapperW;
        } else if (
            o.responsiveView &&
            this.wrapperW <= o.responsiveViewTreshold &&
            wrapperRatio < bookRatio &&
            wrapperRatio < o.responsiveViewRatio
        ) {
            o.zoomMax = (o.zoomSize / this.wrapperH) * (wrapperRatio > pageRatio ? 1 : pageRatio / wrapperRatio);
        } else {
            o.zoomMax = (o.zoomSize / this.wrapperH) * (wrapperRatio > bookRatio ? 1 : bookRatio / wrapperRatio);
        }

        o.zoomMax = Math.max(o.zoomMax, o.zoomMin);
    }

    pdfResize() {
        var self = this;
        self.Book.onZoom();
    }

    createThumbs() {
        this.thumbs = new FLIPBOOK.Thumbnails(this);
    }

    toggleThumbs(value) {
        if (!this.thumbs) {
            this.createThumbs();
        }

        if (typeof value != 'undefined') {
            this.thumbsShowing = !value;
        }

        if (!this.thumbsShowing) {
            this.closeMenus();
            this.thumbs.show();
            this.thumbsShowing = true;
        } else {
            this.thumbs.hide();
            this.thumbsShowing = false;
        }

        this.resize();
    }

    toggleToc(value) {
        if (!this.tocCreated) {
            this.createToc();
            return;
        }

        if (!this.tocShowing || value) {
            this.closeMenus();
            this.tocShowing = true;
            this.tocHolder.classList.remove('flipbook-hidden');
        } else {
            this.tocHolder.classList.add('flipbook-hidden');
            this.tocShowing = false;
        }

        this.resize();
    }

    toggleSearch(value) {
        }

    toggleBookmark(value) {
        }

    closeMenus() {
        if (this.thumbsShowing) {
            this.toggleThumbs();
        }
        if (this.tocShowing) {
            this.toggleToc();
        }
        if (this.searchShowing) {
            this.toggleSearch();
        }
        if (this.bookmarkShowing) {
            this.toggleBookmark();
        }

        if (this.printMenuShowing) {
            this.togglePrintMenu();
        }
        if (this.dlMenuShowing) {
            this.toggleDownloadMenu();
        }
        if (this.shareMenuShowing) {
            this.toggleShareMenu();
        }
        if (this.toolsMenuShowing) {
            this.toggleToolsMenu();
        }
        if (this.notesMenuShowing) {
            this.toggleNotesMenu();
        }
        if (this.passwordMenuShowing) {
            this.togglePasswordMenu();
        }
        this.tooltip2.hideTooltip();
    }

    toggleToolsMenu() {
        var self = this;

        if (!this.toolsMenu.parentNode) {
            this.btnTools.appendChild(this.toolsMenu);

            this.toolsMenu.addEventListener('click', function (event) {
                event.stopPropagation();
            });

            document.addEventListener('click', function (event) {
                if (self.toolsMenuShowing) {
                    self.toggleToolsMenu();
                }
                if (self.shareMenuShowing) {
                    self.toggleShareMenu();
                }
            });
        }

        if (!this.toolsMenuShowing) {
            this.closeMenus();
            this.toolsMenu.classList.remove('flipbook-hidden');
            this.toolsMenuShowing = true;
            this.btnTools.classList.add('flipbook-btn-active');
            this.btnTools.classList.remove('flipbook-has-tooltip');
        } else {
            this.toolsMenu.classList.add('flipbook-hidden');
            this.toolsMenuShowing = false;
            this.btnTools.classList.remove('flipbook-btn-active');
            this.btnTools.classList.add('flipbook-has-tooltip');
        }
    }

    togglePrintMenu() {
        var self = this;

        if (!this.printMenu) {
            this.printMenu = document.createElement('div');
            this.printMenu.className = 'flipbook-sub-menu flipbook-font flipbook-border';
            this.wrapper.appendChild(this.printMenu);

            var center = document.createElement('div');
            center.className = 'flipbook-sub-menu-center';
            this.printMenu.appendChild(center);

            var content = document.createElement('div');
            content.className = 'flipbook-sub-menu-content skin-color-bg';
            center.appendChild(content);

            this.createMenuHeader(content, this.strings.print, this.togglePrintMenu.bind(this));

            var currentPageButton = document.createElement('a');
            currentPageButton.innerHTML =
                '<div class="c-p skin-color flipbook-btn">' + this.strings.printCurrentPage + '</div>';
            content.appendChild(currentPageButton);
            currentPageButton.addEventListener('click', function () {
                self.printPage(self.cPage[0], this);
            });

            var leftPageButton = document.createElement('a');
            leftPageButton.innerHTML =
                '<div class="c-l-p skin-color flipbook-btn">' + this.strings.printLeftPage + '</div>';
            content.appendChild(leftPageButton);
            leftPageButton.addEventListener('click', function () {
                self.printPage(self.cPage[0], this);
            });

            var rightPageButton = document.createElement('a');
            rightPageButton.innerHTML =
                '<div class="c-r-p skin-color flipbook-btn">' + this.strings.printRightPage + '</div>';
            content.appendChild(rightPageButton);
            rightPageButton.addEventListener('click', function () {
                self.printPage(self.cPage[1], this);
            });

            var allPagesButton = document.createElement('a');
            allPagesButton.innerHTML = '<div class="skin-color flipbook-btn">' + this.strings.printAllPages + '</div>';
            content.appendChild(allPagesButton);
            allPagesButton.addEventListener('click', function () {
                self.togglePrintWindow();
            });

            this.closeMenus();
            this.printMenuShowing = true;
            this.updateCurrentPage();
        } else if (!this.printMenuShowing) {
            this.closeMenus();
            this.printMenu.style.display = 'block';
            this.printMenuShowing = true;
            this.updateCurrentPage();
        } else {
            this.printMenu.style.display = 'none';
            this.printMenuShowing = false;
        }
    }

    toggleDownloadMenu() {
        }

    toggleShareMenu() {
        var self = this;
        if (!this.shareMenu.parentNode) {
            this.btnShare.appendChild(this.shareMenu);

            this.shareMenu.addEventListener('click', function (event) {
                event.stopPropagation();
            });

            document.addEventListener('click', function (event) {
                if (self.toolsMenuShowing) {
                    self.toggleToolsMenu();
                }
                if (self.shareMenuShowing) {
                    self.toggleShareMenu();
                }
            });

            var o = this.options;
            var networks = [
                'facebook',
                'twitter',
                'pinterest',
                'linkedin',
                'whatsapp',
                'digg',
                'reddit',
                'email',
                'copyLink',
            ];

            var left = window.screen.width / 2 - 300;
            var top = window.screen.height / 2 - 300;

            networks.forEach(function (network) {
                if (o[network].enabled) {
                    var btn = document.createElement('span');
                    btn.className = 'flipbook-menu-btn-wrapper flipbook-has-tooltip';
                    btn.setAttribute('data-network', network);
                    btn.setAttribute('data-tooltip', o[network].title || o.strings[network]);

                    btn.style.width = `${o.btnSize}px`;
                    btn.style.height = `${o.btnSize}px`;

                    let svg = self.createSVGIcon(network);
                    btn.appendChild(svg);

                    self.shareMenu.appendChild(btn);

                    btn.addEventListener('click', function (e) {
                        e.preventDefault();
                        e.stopPropagation();

                        var network = this.dataset.network;

                        if (network == 'copyLink') {
                            var currentUrl = o.shareUrl || window.location.href;
                            try {
                                currentUrl = decodeURIComponent(currentUrl);
                            } catch (e) {}

                            function fallbackCopyTextToClipboard(text) {
                                const textArea = document.createElement('textarea');
                                textArea.value = text;
                                textArea.style.position = 'fixed'; // Avoid scrolling to bottom of page
                                document.body.appendChild(textArea);
                                textArea.focus({ preventScroll: true });
                                textArea.select();
                                try {
                                    document.execCommand('copy');
                                    btn.setAttribute('data-tooltip', o.strings.copied);
                                    setTimeout(() => {
                                        btn.setAttribute('data-tooltip', o.strings.copyLink);
                                    }, 2000);
                                } catch (err) {
                                    console.error('Fallback: Unable to copy text', err);
                                }
                                document.body.removeChild(textArea);
                            }

                            if (navigator.clipboard && navigator.clipboard.writeText) {
                                navigator.clipboard
                                    .writeText(currentUrl)
                                    .then(() => {
                                        btn.setAttribute('data-tooltip', o.strings.copied);
                                        setTimeout(() => {
                                            btn.setAttribute('data-tooltip', o.strings.copyLink);
                                        }, 2000);
                                    })
                                    .catch((err) => {
                                        console.error('Failed to copy the link: ', err);
                                    });
                            } else {
                                fallbackCopyTextToClipboard(currentUrl);
                            }

                            self.sendGAEvent({
                                event: 'flipbook_share',
                                book_name: self.options.name,
                                url: currentUrl,
                                nonInteraction: true,
                            });
                        } else {
                            var text = encodeURIComponent(
                                o.shareTitle || o[network].description || 'Check out this flipbook'
                            );
                            var url = encodeURIComponent(o.shareUrl || window.location.href);
                            var image = encodeURIComponent(o.shareImage || '');
                            var shareUrl;

                            switch (network) {
                                case 'facebook':
                                    shareUrl = 'https://www.facebook.com/sharer.php?u=' + url + '&t=' + text;
                                    break;
                                case 'twitter':
                                    shareUrl = 'https://twitter.com/intent/tweet?text=' + text + '&url=' + url;
                                    break;
                                }

                            window.open(
                                shareUrl,
                                'Share',
                                'toolbar=no, location=no, directories=no, status=no, ' +
                                    'menubar=no, scrollbars=no, resizable=no, copyhistory=no, ' +
                                    'width=600, height=600, top=' +
                                    top +
                                    ', left=' +
                                    left
                            );

                            self.sendGAEvent({
                                event: 'flipbook_share',
                                book_name: self.options.name,
                                url: shareUrl,
                                nonInteraction: true,
                            });
                        }
                    });
                }
            });
        }

        if (!this.shareMenuShowing) {
            this.closeMenus();
            this.shareMenu.classList.remove('flipbook-hidden');
            this.shareMenuShowing = true;
            this.btnShare.classList.add('flipbook-btn-active');
            this.btnShare.classList.remove('flipbook-has-tooltip');

            setTimeout(function () {
                self.shareMenu.style.right = '0';
                const wrapperRect = self.wrapper.getBoundingClientRect();
                const menuRect = self.shareMenu.getBoundingClientRect();

                if (menuRect.left < wrapperRect.left) {
                    self.shareMenu.style.right =
                        menuRect.left - wrapperRect.left - (wrapperRect.width - menuRect.width) / 2 + 'px';
                }
            }, 0);
        } else {
            this.shareMenu.classList.add('flipbook-hidden');
            this.shareMenuShowing = false;
            this.btnShare.classList.remove('flipbook-btn-active');
            this.btnShare.classList.add('flipbook-has-tooltip');
        }
    }

    toggleNotesMenu() {
        }

    updateNoteSettings(noteType) {
        this.options.noteTypes.forEach(function (type) {
            if (type.id == noteType.id) {
                type.enabled = noteType.enabled;
            }
        });
        this.noteService.updateNoteVisibility();
    }

    bookmarkPage(index) {
        }

    removeBookmark(index) {
        }

    isBookmarked(index) {
        var arr = this.getBookmarkedPages();
        return arr.indexOf(String(index)) > 0;
    }

    getBookmarkedPages() {
        var str = localStorage.getItem(this.options.name + '_flipbook_bookmarks');
        if (str) {
            return str.split(';');
        } else {
            return [];
        }
    }

    setBookmarkedPages(arr) {
        localStorage.setItem(this.options.name + '_flipbook_bookmarks', arr.join(';'));
    }
    async bitmapToBlobUrl(bmp) {
        // OffscreenCanvas when available (fast path)
        if (typeof OffscreenCanvas !== 'undefined') {
            const oc = new OffscreenCanvas(bmp.width, bmp.height);
            const ctx = oc.getContext('2d');
            ctx.drawImage(bmp, 0, 0);
            const blob = await oc.convertToBlob({ type: 'image/png' });
            // If you won't reuse the bitmap, free it
            if (bmp.close)
                try {
                    bmp.close();
                } catch (_) {}
            return URL.createObjectURL(blob);
        }
        // Fallback to regular canvas
        const c = document.createElement('canvas');
        c.width = bmp.width;
        c.height = bmp.height;
        const ctx = c.getContext('2d');
        ctx.drawImage(bmp, 0, 0);
        const blob = await new Promise((r) => c.toBlob(r, 'image/png'));
        if (bmp.close)
            try {
                bmp.close();
            } catch (_) {}
        // help GC
        c.width = c.height = 1;
        return URL.createObjectURL(blob);
    }

    async urlToBlobUrl(u) {
        const res = await fetch(u, { mode: 'cors' });
        const blob = await res.blob();
        return URL.createObjectURL(blob);
    }

    async printPage(index, _) {
        const page = this.options.pages[index];
        const size = this.options.pageTextureSize;

        if (!page) return;

        let url = null;
        const tempBlobUrls = []; // so we can revoke later (optional)

        // try {
        // 1) Explicit print URL (could be image or PDF) — just use it.
        if (page.print) {
            url = page.print;

            // 2) Prefer direct page.src if present (already a usable URL or data: / blob:)
        } else if (page.src) {
            url = page.src;

            // 3) HTMLImageElement path — avoid canvas; use its currentSrc/src
        } else if (page.images && page.images[size]) {
            const img = page.images[size];
            const src = img.currentSrc || img.src;

            if (src) {
                // Usually you can pass this straight through:
                url = src;

                // If you *need* a blob URL (e.g., for cross-window lifetime), do:
                // const blobUrl = await urlToBlobUrl(src);
                // tempBlobUrls.push(blobUrl);
                // url = blobUrl;
            }

            // 4) ImageBitmap path — must serialize once, use blob URL
        } else if (page.imageBitmap && page.imageBitmap[size]) {
            const bmp = page.imageBitmap[size];
            const blobUrl = await this.bitmapToBlobUrl(bmp);
            tempBlobUrls.push(blobUrl);
            url = blobUrl;
        }
        // } catch (e) {
        //     console.warn('printPage: building URL failed, will try to loadPage()', e);
        // }

        if (url) {
            // If your togglePrintWindow revokes only the blob URLs it creates,
            // you can optionally revoke ours after a short delay:
            // this.togglePrintWindow(url);
            // setTimeout(() => tempBlobUrls.forEach(URL.revokeObjectURL), 5000);

            // Better: let togglePrintWindow clean up — pass an array it can revoke:
            if (!this._printTempUrls) this._printTempUrls = [];
            this._printTempUrls.push(...tempBlobUrls);
            this.togglePrintWindow(url);
            return;
        }

        // Nothing usable yet — load the page, then retry
        const pageToLoad = this.options.cover ? index : index + 1;
        this.loadPage(pageToLoad, size, () => {
            // re-enter; now one of the fast paths should trigger
            this.printPage(index);
        });
    }

    downloadPage(index) {
        }

    printFile(url) {
        const isIframe = window.self !== window.top;
        if (isIframe) {
            parent.postMessage(
                {
                    type: 'print',
                    url: url,
                },
                '*'
            );
            return;
        }

        try {
            var printIframe = document.createElement('iframe');
            printIframe.classList.add('flipbook-hidden');
            printIframe.src = url;
            document.body.appendChild(printIframe);
            printIframe.contentWindow.onload = function () {
                var self = this;
                setTimeout(function () {
                    self.print();
                }, 100);
            };
        } catch (e) {}
    }

    togglePrintWindow(url) {
        const isIframe = window.self !== window.top;
        if (isIframe && url) {
            parent.postMessage(
                {
                    type: 'print',
                    url: url,
                },
                '*'
            );
            return;
        }

        var self = this;
        var printContent = '';

        if (url) {
            printContent = url;
        } else if (self.options.printPdfUrl) {
            self.printFile(self.options.printPdfUrl);
            return;
        } else if (self.options.pdfUrl) {
            self.printFile(self.options.pdfUrl);
            return;
        }

        function printme() {
            var link = 'about:blank';
            var pw = window.open(link, '_new');
            pw.document.open();
            if (url) {
                printContent = '<img src="' + url + '"/>\n';
            } else {
                for (var i = 0; i < self.options.pages.length; i++) {
                    if (self.options.pages[i].src) {
                        printContent += '<img src="' + self.options.pages[i].src.toString() + '"/>\n';
                    }
                }
            }

            var printHtml = printWindowHtml(printContent);
            pw.document.write(printHtml);
            pw.document.close();
        }

        function printWindowHtml(printContent) {
            return (
                '<html>\n' +
                '<head>\n' +
                '<script>\n' +
                'function step1() {\n' +
                "  setTimeout('step2()', 10);\n" +
                '}\n' +
                'function step2() {\n' +
                "  window.addEventListener('afterprint', function(){\n" +
                '       debugger;\n' +
                '       window.close();\n' +
                '  });\n' +
                '  window.print();\n' +
                '}\n' +
                '</scr' +
                'ipt>\n' +
                '<style>img {' +
                'display:block;' +
                'max-width:100%;' +
                'page-break-after: always;' +
                '}' +
                '@media print header{' +
                'display: none;' +
                '}</style>\n' +
                '</head>\n' +
                "<body onLoad='step1()'>\n" +
                printContent +
                '</body>\n' +
                '</html>\n'
            );
        }

        printme();
    }

    thumbsVertical() {
        if (!this.thumbsCreated) {
            return;
        }
    }

    isIOS() {
        return /iP(ad|hone|od)/.test(navigator.userAgent);
    }

    fakeScrollToHideToolbar() {
        if (!this.isIOS()) return;
        // Scroll down a bit, then immediately scroll back up
        const x = window.scrollX || window.pageXOffset;
        const y = window.scrollY || window.pageYOffset;
        window.scrollTo(x, y + 1);
        setTimeout(() => {
            window.scrollTo(x, y);
        }, 10);
    }

    fakeScrollToShowToolbar() {
        if (!this.isIOS()) return;
        // Scroll up a bit, then immediately scroll back down
        const x = window.scrollX || window.pageXOffset;
        const y = window.scrollY || window.pageYOffset;
        window.scrollTo(x, y - 1);
        setTimeout(() => {
            window.scrollTo(x, y);
        }, 10);
    }

    requestFullscreen(element) {
        const methods = ['requestFullscreen', 'mozRequestFullScreen', 'webkitRequestFullscreen', 'msRequestFullscreen'];
        for (const method of methods) {
            if (element[method]) {
                try {
                    element[method]();
                    return;
                } catch (error) {
                    this.handleFullscreenError(error);
                    return;
                }
            }
        }
        this.handleFullscreenError(new Error('Fullscreen API is not supported on this element.'));
    }

    exitFullscreen() {
        const methods = ['exitFullscreen', 'mozCancelFullScreen', 'webkitExitFullscreen', 'msExitFullscreen'];
        for (const method of methods) {
            if (document[method]) {
                try {
                    document[method]();
                    return;
                } catch (error) {
                    this.handleFullscreenError(error);
                    return;
                }
            }
        }
        this.handleFullscreenError(new Error('Exiting fullscreen API is not supported in this document.'));
    }

    toggleExpand() {
        const elem = this.fullscreenElement;
        const isFullscreen = () => {
            return !!(
                document.fullscreenElement ||
                document.mozFullScreenElement ||
                document.webkitFullscreenElement ||
                document.msFullscreenElement
            );
        };

        try {
            if (isFullscreen()) {
                this.exitFullscreen();
            } else {
                this.requestFullscreen(elem);
            }
        } catch (error) {
            this.handleFullscreenError(error);
        }

        if (this.toolsMenuShowing) {
            this.toggleToolsMenu();
        }
    }

    handleFullscreenError(error) {
        const elem = this.fullscreenElement;
        this.fullscreenActive = !this.fullscreenActive;
        const isIframe = window.self !== window.top;
        if (isIframe) {
            parent.postMessage(
                {
                    type: 'toggleExpand',
                    fullscreenActive: this.fullscreenActive,
                },
                '*'
            );
        } else {
            if (this.fullscreenActive) {
                if (elem !== document.body) {
                    this.saveScrollPosition();
                    document.body.classList.add('flipbook-overflow-hidden');
                    elem.classList.add('flipbook-browser-fullscreen');
                    this.elemParent = elem.parentNode;
                    document.body.appendChild(elem);
                    // this.fakeScrollToHideToolbar();
                }
            } else if (this.elemParent) {
                this.elemParent.appendChild(elem);
                this.elemParent = null;
                // this.fakeScrollToShowToolbar();
                document.body.classList.remove('flipbook-overflow-hidden');
                elem.classList.remove('flipbook-browser-fullscreen');
                this.restoreScrollPosition();
            }
        }

        this.toggleIcon(this.btnExpand, !this.fullscreenActive);
    }

    saveScrollPosition() {
        document.body.dataset.flipbookScrollX = window.scrollX || window.pageXOffset;
        document.body.dataset.flipbookScrollY = window.scrollY || window.pageYOffset;
    }

    restoreScrollPosition() {
        const scrollX = parseInt(document.body.dataset.flipbookScrollX || 0, 10);
        const scrollY = parseInt(document.body.dataset.flipbookScrollY || 0, 10);

        if (!isNaN(scrollX) && !isNaN(scrollY)) {
            window.scrollTo(scrollX, scrollY);
            delete document.body.dataset.flipbookScrollX;
            delete document.body.dataset.flipbookScrollY;
        }
    }

    expand() {}

    toggleSinglePage() {
        }

    toggleAutoplay(value) {
        }
};

FLIPBOOK.Book = class {
    constructor(main, options) {
        this.rightIndex = 0;
        this.options = options;
        this.main = main;
        this.pageWidth = options.pageWidth;
        this.pageHeight = options.pageHeight;
        this.singlePage = options.singlePageMode;

        const pages = options.pages;
        let numSheets = Math.ceil(pages.length / 2);

        if (options.singlePageMode) {
            numSheets = pages.length;
        } else if (!options.cover && pages.length % 2 === 0) {
            numSheets += 1;
        }

        this.numSheets = numSheets;
    }

    goToPage() {}

    getRightIndex() {}

    getPageHeight() {
        const bookWidth = this.bookWidth || 1;
        return 10;
    }

    canFlipNext() {
        if (this.flippedright > 0) {
            if (this.singlePage && this.flippedright == 1) {
                return false;
            } else if (this.view == 1 && this.isFocusedLeft && this.isFocusedLeft()) {
                return true;
            } else if (this.flippedright == 1 && !this.options.rightToLeft && !this.options.backCover) {
                return false;
            } else if (this.flippedright == 1 && this.options.rightToLeft && !this.options.cover) {
                return false;
            } else {
                return true;
            }
        }
        return false;
    }

    canFlipPrev() {
        const first = this.options.cover ? 0 : 1;
        if (this.flippedleft > first) {
            if (this.view == 1 && this.isFocusedRight && this.isFocusedRight()) {
                return true;
            } else if (this.flippedleft == 1 && this.options.rightToLeft && !this.options.backCover) {
                return false;
            } else {
                return true;
            }
        }
        return false;
    }

    getCurrentPageNumber() {
        var ri = this.rightIndex % 2 == 1 ? this.rightIndex + 1 : this.rightIndex;
        if (this.options.rightToLeft) {
            ri = this.options.pages.length - ri;
            return this.isFocusedRight() ? ri : ri + 1;
        } else {
            return this.isFocusedLeft() ? ri : ri + 1;
        }
    }

    async startPageItems(htmlContent) {
        if (!htmlContent) return;

        const mediaItems = htmlContent.querySelectorAll('.flipbook-page-item');
        const youtubeItems = htmlContent.querySelectorAll('.flipbook-page-item-youtube');

        // Native <video>/<audio> handling (unchanged + small safety fixes)
        if (!htmlContent.dataset.pageItemsStarted) {
            mediaItems.forEach(function (item) {
                if (item.nodeName === 'VIDEO' || item.nodeName === 'AUDIO') {
                    const src = item.getAttribute('data-url');
                    if (!src) return;

                    const source = item.querySelector('source') || document.createElement('source');
                    source.setAttribute('src', src);
                    if (!source.parentNode) item.appendChild(source);

                    item.load();

                    if (item.nodeName === 'AUDIO' && !item.controls) {
                        item.style.visibility = 'hidden';
                    }

                    if (item.autoplay || item.controls) {
                        const playIfReady = () => {
                            if (item.currentTime >= item.duration && item.duration > 0) item.load();
                            if (item.autoplay) item.play().catch(() => {});
                        };

                        if (item.readyState < 4) {
                            item.oncanplay = playIfReady;
                        } else {
                            playIfReady();
                        }
                    }
                }
            });
            await this.waitForYouTubeAPI();
            this.initYouTubePlayers(youtubeItems);
            htmlContent.dataset.pageItemsStarted = 'true';
        } else {
            mediaItems.forEach((item) => {
                if (item.nodeName === 'VIDEO' || item.nodeName === 'AUDIO') {
                    if (item.autoplay) {
                        if (!item.dataset.autoplayResume) {
                            item.currentTime = 0;
                        }
                        item.play().catch(() => {});
                    }
                }

                if (item.player && item.dataset.autoplayResume === 'true') {
                    const resume = () => {
                        try {
                            const time = parseFloat(item.dataset.ytCurrentTime) || 0;
                            item.player.seekTo(time, true);
                            item.player.playVideo();

                            if (item.dataset.ytMuted === 'false') item.player.unMute();
                        } catch (e) {
                            console.error('Error resuming video:', e);
                        }
                    };

                    // Run when ready or when state becomes responsive
                    try {
                        item.player.addEventListener('onReady', resume);
                    } catch {}

                    const pollInterval = setInterval(() => {
                        try {
                            if (
                                typeof item.player.getPlayerState === 'function' &&
                                item.player.getPlayerState() !== -1
                            ) {
                                clearInterval(pollInterval);
                                resume();
                            }
                        } catch (e) {}
                    }, 200);

                    setTimeout(() => clearInterval(pollInterval), 10000);
                }
            });
        }
    }

    waitForYouTubeAPI() {
        return new Promise((resolve) => {
            if (window.YT && YT.Player) {
                resolve();
            } else {
                const checkInterval = setInterval(() => {
                    if (window.YT && YT.Player) {
                        clearInterval(checkInterval);
                        resolve();
                    }
                }, 100);
                if (typeof window.onYouTubeIframeAPIReady !== 'function') {
                    window.onYouTubeIframeAPIReady = () => {
                        clearInterval(checkInterval);
                        resolve();
                    };
                }
            }
        });
    }

    initYouTubePlayers(youtubeItems) {
        youtubeItems.forEach((div) => {
            const videoId = div.dataset.videoId;
            const autoplay = div.dataset.autoplay === 'true';
            const autoplayResume = div.dataset.autoplayResume === 'true';
            const controls = div.dataset.controls === 'true';
            const loop = div.dataset.loop === 'true';
            const muted = div.dataset.muted === 'true';

            const playerIframe = div.playerIframe || document.createElement('div');
            playerIframe.id = 'yt-' + Math.random();
            playerIframe.className = 'r3d-yt-iframe';
            this.main.youtubes = this.main.youtubes || [];
            this.main.youtubes.push(div);
            div.playerIframe = playerIframe;
            div.appendChild(playerIframe);

            if (div.player && typeof div.player.getPlayerState === 'function') {
                if (autoplay) {
                    div.player.playVideo();
                }
            }

            const playerVars = {
                enablejsapi: 1,
                origin: window.location.origin,
                controls: controls ? 1 : 0,
                rel: 0,
                playsinline: 1,
                fs: 1,
            };
            if (loop) {
                playerVars.loop = 1;
                playerVars.playlist = videoId;
            }

            const player = new YT.Player(playerIframe.id, {
                videoId: videoId,
                playerVars: playerVars,
                events: {
                    onReady: (event) => {
                        const p = event.target;
                        div.player = p;

                        if (autoplay || muted) p.mute();
                        if (this.options.backgroundMusic) {
                            p.playVideo(); // temporary play to trigger state change if needed
                            if (p.getPlayerState() === 1) this.pauseGlobalSound();
                        }

                        if (autoplay) p.playVideo();
                    },
                    onStateChange: (event) => {
                        if (event.data === YT.PlayerState.PLAYING && this.options.backgroundMusic) {
                            this.pauseGlobalSound();
                        }
                    },
                },
            });
            div.player = player;
        });
    }

    loadPageAsync(page, side) {
        if (!page) return Promise.resolve();

        if (!page._sidePromises) page._sidePromises = {};
        if (!page._sidePromises[side]) page._sidePromises[side] = {};

        const o = this.options;
        const { pageTextureSize, pageTextureSizeSmall, pdfMode } = o;

        const { wrapperW, wrapperH, pageW, pageH, zoom } = this.main;
        const view = this.view;
        const bookWdith = this.bookWidth || 2;
        const ar = [...o.l];
        const fitToHeight = (pageW * bookWdith) / pageH < wrapperW / wrapperH;

        let pageSize = fitToHeight ? wrapperH * zoom : (wrapperW * zoom * pageH) / (pageW * bookWdith);

        let size = !pdfMode ? 2000 : pageSize < pageTextureSizeSmall * 0.9 ? pageTextureSizeSmall : pageTextureSize;
        if (pageW > pageH) size *= pageW / pageH;
        this.currentPageTextureSize = size;
        const { s: texture, d } = o;
        const a = d ? d[ar[0][ar[3]] * ar[2][[ar[3]]]] % ar[1][ar[3]] : 0;

        if (!page._sidePromises[side][size]) {
            page._sidePromises[side][size] = new Promise((resolve, reject) => {
                if (side && !texture && !a) {
                    page[ar[0]](side, size, () => {
                        resolve();
                    });
                } else {
                    resolve();
                }
            });
        }

        return page._sidePromises[side][size];
    }

    loadHTMLAsync(page, side) {
        if (!page) return Promise.resolve();

        if (!page._sideHTMLPromises) page._sideHTMLPromises = {};

        if (!page._sideHTMLPromises[side]) {
            page._sideHTMLPromises[side] = new Promise((resolve) => {
                if (side) {
                    page.loadHTML(side, () => {
                        resolve();
                    });
                } else {
                    resolve();
                }
            });
        }

        return page._sideHTMLPromises[side];
    }

    pageLoaded(page, side) {
        if (page) page.loaded(side);
    }

    destroy() {}
};

FLIPBOOK.Notes = class {
    constructor(main) {
        const self = this;
        this.main = main;
        this.notes = Object.values(main.options.notes || []);

        this.textSelectionRect = document.createElement('span');
        this.textSelectionRect.className = 'flipbook-add-note-rect hover';
        const btn = document.createElement('span');
        btn.className = 'add-note-btn';
        btn.innerText = main.options.strings.addNote;
        btn.onclick = function () {
            self.hideButton();
            self.createNote();
        };
        btn.onmousedown = function () {};
        this.noteButton = btn;
        this.textSelectionRect.appendChild(btn);
        this.hideButton();

        this.notePopup = document.createElement('div');
        this.notePopup.className = 'flipbook-note-display';
        this.notePopup.innerHTML =
            '<div class="note-content"><textarea role="textbox" maxlength="500" placeholder="' +
            main.options.strings.typeInYourNote +
            '" tabindex="0" class="note-article"></textarea></div> ' +
            '<div  aria-hidden="true" class="note-footer"> ' +
            '<span title="Delete Note" class="icon icon-trash-can note-button note-delete-button">' +
            '<svg version="1.1" viewBox="0 0 24 24" class="svg-icon svg-fill" focusable="false">' +
            '<path pid="0" d="M15.976 17.862c0 .607-.414 1.138-.885 1.138H8.893c-.47 ' +
            '0-.869-.513-.869-1.12L8.002 8H16l-.023 9.862zM20 6h-5V4.466C15 3.66 14.853 3 14.013 ' +
            '3h-3.858C9.315 3 9 3.659 9 4.466V6H4v2h2v10c0 1.843 1.153 3 2.893 3h6.198C16.84 21 18 ' +
            '19.852 18 18V8h2V6z"></path>' +
            '<path pid="1" d="M13 18h1V9h-1zM10 18h1V9h-1z"></path></svg></span></div>';
        this.notePopup.onmouseup = function (e) {
            e.stopPropagation();
        };
        this.noteDelete = this.notePopup.getElementsByClassName('note-delete-button')[0];
        this.noteDelete.onclick = function () {
            self.deleteNote();
        };
        this.noteInput = this.notePopup.querySelectorAll('textarea')[0];
        this.noteInput.onchange = function () {
            const noteId = this.dataset.note;
            const noteText = this.value;
            self.getNoteById(noteId).text = noteText;
            self.main.trigger('r3d-update-note', {
                note: self.getNoteById(noteId),
            });
        };

        this.updateNoteVisibility();
    }

    initPageNotes(page) {
        const self = this;
        this.notes.forEach(function (note) {
            if (note.page == page.index + 1) {
                self.addPageNote(note, page);
            }
        });
        this.addPageNoteListeners(page);
    }

    getNodeColor(note) {
        let result = 'green';
        this.main.options.noteTypes.forEach(function (type) {
            if (type.id == note.type) {
                result = type.color;
            }
        });
        return result;
    }

    updateNoteVisibility() {
        let root = document.documentElement;
        this.main.options.noteTypes.forEach(function (type) {
            root.style.setProperty(`--note-${type.id}-opacity`, type.enabled ? '1' : '0');
            root.style.setProperty(`--note-${type.id}-pointer-events`, type.enabled ? 'auto' : 'none');
        });
    }

    addPageNote(note) {
        }

    showButton() {
        this.noteButton.classList.remove('flipbook-hidden');
    }

    hideButton() {
        this.noteButton.classList.add('flipbook-hidden');
    }

    showNote(target, page, id) {
        const pageRect = page.htmlContent.getBoundingClientRect();
        const targetRect = target.getBoundingClientRect();

        const note = this.getNoteById(id);
        const $htmlContent = jQuery(page.htmlContent);
        $htmlContent[0].appendChild(this.notePopup);

        const main = this.main;
        const scale = (main.Book.sc * main.wrapperH) / 1000;
        const noteTop = (targetRect.y / main.zoom - pageRect.y / main.zoom) / scale;

        if (noteTop < 150) {
            this.notePopup.style.top = noteTop + 40 + 'px';
        } else {
            this.notePopup.style.top = noteTop - 140 + 'px';
        }

        this.notePopup.style.left =
            (targetRect.x / main.zoom + (0.5 * targetRect.width) / main.zoom - pageRect.x / main.zoom) / scale + 'px';

        this.noteInput.value = note.text || '';

        this.noteInput.dataset.note = note.id;
        this.activeNote = note;
        if (note.readonly) {
            this.disableNoteEdit();
        } else {
            this.enableNoteEdit();
        }
    }

    enableNoteEdit() {
        this.noteDelete.classList.remove('flipbook-hidden');
        this.noteInput.readOnly = false;
    }

    disableNoteEdit() {
        this.noteDelete.classList.add('flipbook-hidden');
        this.noteInput.readOnly = true;
    }

    hideNote() {
        if (this.notePopup.parentNode) {
            this.notePopup.parentNode.removeChild(this.notePopup);
        }
        this.activeNote = null;
    }

    createNote() {
        this.textSelectionRect.appendChild(this.notePopup);
        this.notePopup.style.left = '50%';
        if (this.textSelectionRect.offsetTop < 150) {
            this.notePopup.style.top = '40px';
        } else {
            this.notePopup.style.top = '-140px';
        }
        this.noteInput.value = '';
        this.noteInput.focus();
        const note = {
            selectedText: this.selectedTextString,
            page: this.selectedTextPageNumber,
            type: 1,
        };
        this.notes.push(note);
        this.addPageNote(note);
        this.noteInput.dataset.note = note.id;
        this.addPageNoteListeners(this.main.options.pages[note.page - 1]);
        this.activeNote = note;
        this.enableNoteEdit();
        this.main.trigger('r3d-update-note', { note: note });
    }

    deleteNote() {
        const page = this.main.options.pages[this.activeNote.page - 1];
        const $htmlContent = jQuery(page.htmlContent);
        const $textLayer = $htmlContent.find('.textLayer');
        $textLayer.unmark({
            className: `flipbook-note-${this.activeNote.id}`,
        });
        const index = this.notes.indexOf(this.activeNote);
        if (index > -1) {
            this.notes.splice(index, 1);
        }
        this.hideNote();
        this.main.trigger('r3d-delete-note', {
            note: this.activeNote,
        });
    }

    getNoteById(id) {
        let toReturn = null;
        this.notes.forEach(function (note) {
            if (Number(note.id) == Number(id)) {
                toReturn = note;
            }
        });
        return toReturn;
    }

    removeTextRect() {
        if (this.textSelectionRect.parentNode) {
            this.textSelectionRect.parentNode.removeChild(this.textSelectionRect);
        }
    }

    addPageNoteListeners(page) {
        const self = this;

        if (!page.textLayerDiv || page.notesInitialized) {
            return;
        }

        page.textLayerDiv.addEventListener('mouseup', function (e) {
            if (e.target.classList.contains('add-note-btn')) {
                return;
            }

            self.hideNote();
            self.showButton();

            self.selectedText = window.getSelection();
            if (self.selectedText.toString()) {
                self.selectedTextString = self.selectedText.toString();
                self.selectedTextPageNumber = Number(this.dataset.pageNumber);
                self.selectedTextRange = self.selectedText.getRangeAt(0);

                const rect = self.selectedTextRange.getBoundingClientRect();
                const pageRect = this.getBoundingClientRect();
                const main = self.main;
                let scale = (main.Book.sc * main.wrapperH) / 1000;
                self.textSelectionRect.style.top = (rect.y / main.zoom - pageRect.y / main.zoom) / scale + 'px';
                self.textSelectionRect.style.left = (rect.x / main.zoom - pageRect.x / main.zoom) / scale + 'px';
                self.textSelectionRect.style.width = rect.width / main.zoom / scale + 'px';
                self.textSelectionRect.style.height = rect.height / main.zoom / scale + 'px';
                this.appendChild(self.textSelectionRect);
            } else {
                self.removeTextRect();
            }
        });

        page.textLayerDiv.addEventListener('mousemove', function (e) {
            if (self.selectedTextRange && self.selectedText.toString()) {
                const textSelectionRect = self.textSelectionRect.getBoundingClientRect();
                const btnRect = self.textSelectionRect.firstChild.getBoundingClientRect();
                if (
                    e.clientX >= textSelectionRect.left &&
                    e.clientX <= textSelectionRect.right &&
                    e.clientY >= btnRect.top &&
                    e.clientY <= textSelectionRect.bottom
                ) {
                    self.showButton();
                } else {
                    self.hideButton();
                }
            }
        });

        page.notesInitialized = true;
    }
};

FLIPBOOK.Tooltip = class {
    constructor() {
        this.domElement = document.createElement('div');
        this.domElement.className = 'flipbook-tooltip flipbook-noselect';
        this.domElement.classList.add('flipbook-hidden');
        const self = this;
        this.currentPosition = { x: 0, y: 0 };
        document.addEventListener('scroll', function () {
            self.position();
        });
    }

    show(params) {
        if (!this.showing) {
            this.domElement.classList.remove('flipbook-hidden');
            this.showing = true;

            if (params.text) {
                this.domElement.innerText = params.text;
            }
            if (params.parent) {
                params.parent.appendChild(this.domElement);
            }
            if (params.onClick) {
                this.domElement.style.cursor = 'pointer';
                this.domElement.onclick = params.onClick;
            } else {
                this.domElement.style.cursor = 'auto';
                this.domElement.removeAttribute('onclick');
            }
            this.currentPosition = params.position;
            this.position();
        }
    }
    hide() {
        if (this.showing) {
            this.domElement.classList.add('flipbook-hidden');
            this.showing = false;
        }
    }
    position() {
        const wrapperRect = this.domElement.parentNode.getBoundingClientRect();
        this.domElement.style.top = this.currentPosition.y - wrapperRect.top - scrollY + 'px';
        this.domElement.style.left = this.currentPosition.x - wrapperRect.left - scrollX + 'px';
    }
};

FLIPBOOK.ProgressBar = class {
    constructor(options = {}) {
        this.value = options.value || 0; // 0..100
        this.min = options.min || 0;
        this.max = options.max || 100;
        this.onChange = options.onChange || function (val) {};
        this.colors = options.colors || {};
        this.wrapper = options.wrapper || document.body;
        this.el = null;
        this._dragging = false;

        this._render();
        this.setValue(this.value);
        this._bindEvents();
    }

    _render() {
        // Create the structure
        const bar = document.createElement('div');
        bar.className = 'flipbook-progress-bar';
        bar.tabIndex = 0;

        // Theming via CSS variables
        if (this.colors.bg) bar.style.setProperty('--progress-bg', this.colors.bg);
        if (this.colors.fill) bar.style.setProperty('--progress-fill', this.colors.fill);
        if (this.colors.thumb) bar.style.setProperty('--progress-thumb', this.colors.thumb);
        if (this.colors.thumbBorder) bar.style.setProperty('--progress-thumb-border', this.colors.thumbBorder);

        bar.innerHTML = `
      <div class="progress-track"></div>
      <div class="progress-filled"></div>
      <div class="progress-thumb" tabindex="0" role="slider" aria-valuenow="0" aria-valuemin="${this.min}" aria-valuemax="${this.max}"></div>
    `;

        this.wrapper.appendChild(bar);

        // Save refs
        this.el = bar;
        this.track = bar.querySelector('.progress-track');
        this.filled = bar.querySelector('.progress-filled');
        this.thumb = bar.querySelector('.progress-thumb');
    }

    _bindEvents() {
        // Mouse/touch events for dragging
        this.thumb.addEventListener('mousedown', this._startDrag.bind(this));
        this.el.addEventListener('mousedown', this._startDrag.bind(this));
        window.addEventListener('mousemove', this._onDrag.bind(this));
        window.addEventListener('mouseup', this._endDrag.bind(this));

        this.thumb.addEventListener('touchstart', this._startDrag.bind(this), { passive: false });
        this.el.addEventListener('touchstart', this._startDrag.bind(this), { passive: false });
        window.addEventListener('touchmove', this._onDrag.bind(this), { passive: false });
        window.addEventListener('touchend', this._endDrag.bind(this));

        // Keyboard accessibility
        this.thumb.addEventListener('keydown', (e) => {
            let step = (this.max - this.min) / 100 || 1;
            if (e.key === 'ArrowRight' || e.key === 'ArrowUp') {
                this.setValue(this.value + step);
                e.preventDefault();
            }
            if (e.key === 'ArrowLeft' || e.key === 'ArrowDown') {
                this.setValue(this.value - step);
                e.preventDefault();
            }
        });
    }

    _startDrag(e) {
        if (e.type === 'mousedown' && e.button !== 0) return;
        this._dragging = true;
        document.body.style.userSelect = 'none';
        this._onDrag(e);
    }

    _onDrag(e) {
        if (!this._dragging) return;
        let clientX;
        if (e.touches) {
            clientX = e.touches[0].clientX;
        } else {
            clientX = e.clientX;
        }
        const rect = this.el.getBoundingClientRect();
        let percent = ((clientX - rect.left) / rect.width) * 100;
        let val = this.min + (this.max - this.min) * (percent / 100);
        this.setValue(val);
    }

    _endDrag() {
        if (!this._dragging) return;
        this._dragging = false;
        document.body.style.userSelect = '';
    }

    setValue(val) {
        val = Math.max(this.min, Math.min(this.max, val));
        this.value = val;
        let percent = ((val - this.min) / (this.max - this.min)) * 100;
        this.filled.style.width = percent + '%';
        this.thumb.style.left = percent + '%';
        this.thumb.setAttribute('aria-valuenow', Math.round(val));
        this.onChange(val);
    }

    getValue() {
        return this.value;
    }
};

FLIPBOOK.Thumbnails = class {
    constructor(main) {
        var options = main.options;
        var wrapper = main.wrapper;
        this.main = main;
        this.options = options;
        this.wrapper = wrapper;
        this.active = null;
        this.thumbHolder = document.createElement('div');
        this.thumbHolder.className = 'flipbook-thumbHolder flipbook-side-menu skin-color-bg flipbook-border';
        wrapper.appendChild(this.thumbHolder);
        this.thumbHolder.style[options.sideMenuPosition] = '0';
        this.thumbHolder.classList.add('flipbook-hidden');
        main.createMenuHeader(this.thumbHolder, main.strings.thumbnails, main.toggleThumbs);
        this.bookmark = document.createElement('div');
        this.bookmark.className = 'flipbook-font';
        this.thumbHolder.appendChild(this.bookmark);
        this.bookmark.classList.add('flipbook-hidden');
        var currentBookmark = document.createElement('a');
        currentBookmark.innerHTML =
            '<div class="c-p skin-color flipbook-btn">' + options.strings.bookmarkCurrentPage + '</div>';
        this.bookmark.appendChild(currentBookmark);
        currentBookmark.addEventListener('click', function (e) {
            main.bookmarkPage(main.cPage[0], this);
            e.preventDefault();
            e.stopPropagation();
        });
        var leftBookmark = document.createElement('a');
        leftBookmark.innerHTML =
            '<div class="c-l-p skin-color flipbook-btn">' + options.strings.bookmarkLeftPage + '</div>';
        this.bookmark.appendChild(leftBookmark);
        leftBookmark.addEventListener('click', function (e) {
            main.bookmarkPage(main.cPage[0], this);
            e.preventDefault();
            e.stopPropagation();
        });
        var rightBookmark = document.createElement('a');
        rightBookmark.innerHTML =
            '<div class="c-r-p skin-color flipbook-btn">' + options.strings.bookmarkRightPage + '</div>';
        this.bookmark.appendChild(rightBookmark);
        rightBookmark.addEventListener('click', function (e) {
            main.bookmarkPage(main.cPage[1], this);
            e.preventDefault();
            e.stopPropagation();
        });
        this.search = document.createElement('div');
        this.search.className = 'flipbook-search';
        this.thumbHolder.appendChild(this.search);
        this.search.classList.add('flipbook-hidden');
        this.searchBar = document.createElement('div');
        this.searchBar.className = 'flipbook-findbar';
        this.search.appendChild(this.searchBar);
        this.findInputCotainer = document.createElement('div');
        this.findInputCotainer.id = 'findbarInputContainer';
        this.searchBar.appendChild(this.findInputCotainer);
        this.findInput = document.createElement('input');
        this.findInput.className = 'toolbarField skin-color skin-color-bg';
        this.findInput.title = 'Find';
        this.findInput.autocapitalize = 'none';
        this.findInput.placeholder = `${options.strings.findInDocument}...`;
        this.findInputCotainer.appendChild(this.findInput);
        this.clearInput = document.createElement('span');
        this.clearInput.className = 'flipbook-search-clear flipbook-hidden skin-color skin-color-bg';
        var closeIcon = main.createSVGIcon('close');
        this.clearInput.appendChild(closeIcon);
        this.clearInput.addEventListener('click', () => {
            this.findInput.value = '';
            this.hideAllThumbs();
            this.clearSearchResults();
            main.unmark();
            main.searchingString = '';
            this.clearInput.classList.add('flipbook-hidden');
            this.findInput.focus({ preventScroll: true });
        });
        this.findInputCotainer.appendChild(this.clearInput);
        this.thumbsWrapper = document.createElement('div');
        this.thumbsWrapper.className = 'flipbook-thumbsWrapper';
        this.thumbHolder.appendChild(this.thumbsWrapper);
        this.closeGrid = document.createElement('div');
        this.closeGrid.className = 'flipbook-thumbs-grid-close skin-color flipbook-menu-btn';
        this.thumbsWrapper.appendChild(this.closeGrid);
        this.closeGrid.addEventListener('click', (e) => {
            e.stopPropagation();
            e.preventDefault();
            this.main.closeMenus();
        });
        var closeIcon = this.main.createSVGIcon('close');
        this.closeGrid.appendChild(closeIcon);
        this.thumbsScroller = document.createElement('div');
        this.thumbsScroller.className = 'flipbook-thumbsScroller skin-color';
        this.thumbsWrapper.appendChild(this.thumbsScroller);
        this.findInput.addEventListener('keyup', (e) => {
            var str = e.currentTarget.value;
            this.searchString(str);
        });
        this.thumbs = [];

        this.isOverlayMode = options.thumbsStyle === 'overlay';

        for (let i = 0; i < options.pages.length; i++) {
            this.createThumb(options.pages[i], i);
        }

        if (this.isOverlayMode) {
            this.createSpreads();
            this.showSpreads();
        }

        this.main.on('pagechange', () => {
            this.updateCurrentPages();
        });
    }

    createSpreads() {
        let numSpreads;
        const options = this.options;
        this.spreads = [];
        if (this.options.cover) {
            if (this.options.backCover) {
                numSpreads = options.pages.length / 2 + 2;
            } else {
                numSpreads = options.pages.length / 2 + 1;
            }
        } else {
            numSpreads = options.pages.length / 2;
        }
        for (let i = 0; i < numSpreads; i++) {
            const spread = document.createElement('div');
            this.spreads.push(spread);
            spread.classList.add('flipbook-thumb-spread');
            const spreadLeft = 2 * i;
            const spreadRight = 2 * i + 1;
            spread.dataset.pages = String(spreadLeft) + ',' + String(spreadRight);
            this.thumbsScroller.appendChild(spread);
        }
    }

    showSpreads() {
        let spreadLeft, spreadRight;
        for (let i = 0; i < this.spreads.length; i++) {
            const spread = this.spreads[i];
            spread.style.display = '';
            spreadLeft = 2 * i;
            spreadRight = 2 * i + 1;
            if (this.thumbs[spreadLeft - 1]) spread.appendChild(this.thumbs[spreadLeft - 1]);
            if (this.thumbs[spreadRight - 1]) spread.appendChild(this.thumbs[spreadRight - 1]);
        }
        this.spreadsShowing = true;
    }

    showSingles() {
        for (let i = 0; i < this.thumbs.length; i++) {
            const thumb = this.thumbs[i];
            this.thumbsScroller.appendChild(thumb);
        }
        this.hideSpreads();
    }

    hideSpreads() {
        for (let i = 0; i < this.spreads.length; i++) {
            const spread = this.spreads[i];
            spread.style.display = 'none';
        }
        this.spreadsShowing = false;
    }

    createThumb(item, i) {
        var main = this.main,
            options = this.options;
        var h = options.thumbSize;
        var w = (options.thumbSize * options.pageWidth) / options.pageHeight;
        var thumb = document.createElement('div');
        var side = i % 2 == 1 ? 'left' : 'right';
        thumb.className = 'flipbook-thumb flipbook-thumb-' + side;
        thumb.setAttribute('data-thumb-index', i);
        thumb.style.height = h + 'px';

        var btnClose = document.createElement('span');
        btnClose.className = 'thumb-btn-close skin-color skin-color-bg';
        thumb.appendChild(btnClose);
        btnClose.addEventListener('click', function (e) {
            e.stopPropagation();
            e.preventDefault();
            main.removeBookmark(thumb.getAttribute('data-thumb-index'));
        });
        var iconClose = main.createSVGIcon('close');
        btnClose.appendChild(iconClose);
        this.thumbs.push(thumb);
        var hasBackCover = options.pages.length % 2 === 0;
        var isCover = i === 0;
        var isBackCover = hasBackCover && i === options.pages.length - 1;
        var isDouble = false;
        if (options.doublePage) {
            hasBackCover = options.backCover;
            isBackCover = hasBackCover && i === options.pages.length - 1;
            isDouble = !isCover && !isBackCover;
        }
        var thumbImg;

        let isLeft = false,
            isRight = false;

        let pdfPageIndex = i + 1;
        if (this.options.doublePage) {
            pdfPageIndex = Math.ceil(i / 2) + 1;
        }
        isLeft = !isCover && i % 2 == 1 && !isBackCover;
        isRight = !isCover && i % 2 == 0 && !isBackCover;

        if (options.pdfMode) {
            thumbImg = this.getThumbFromPdf(pdfPageIndex, isLeft, isRight);
        } else if (item.thumb) {
            thumbImg = document.createElement('img');
            thumbImg.src = item.thumb;
            if (isRight && isDouble) thumbImg.style.marginLeft = '-100%';
        } else {
            return;
        }
        thumb.appendChild(thumbImg);
        thumbImg.style.height = h + 'px';

        thumb.style.width = w + 'px';

        var pageNumber = i + 1;

        thumb.setAttribute('data-page', pageNumber);
        var title = '';
        var pagesStr = '';

        title = pageNumber.toString();
        if (this.options.pages[i] && this.options.pages[i].name) {
            title = this.options.pages[i].name;
        }
        pagesStr = title;
        var span = document.createElement('span');
        span.textContent = title;
        span.className = 'skin-color flipbook-thumb-num';
        thumb.appendChild(span);
        thumb.setAttribute('data-pages', pagesStr);
        if (options.thumbsStyle === 'overlay') {
            options.thumbsCloseOnClick = true;
        }
        thumb.addEventListener('click', (e) => {
            e.stopPropagation();
            e.preventDefault();

            let targetPage;

            const pagesStr = e.currentTarget.getAttribute('data-pages'); // e.g., "10,11" or "1"
            if (pagesStr && pagesStr.indexOf(',') !== -1) {
                const [lowStr, highStr] = pagesStr.split(',');
                const low = Number(lowStr);
                const high = Number(highStr);
                // LTR -> go to left (low). RTL -> go to right (high).
                targetPage = options.rightToLeft ? high : low;
            } else {
                targetPage = Number(pagesStr || e.currentTarget.getAttribute('data-page'));
            }

            // Safety: clamp to valid range
            if (!Number.isFinite(targetPage) || targetPage < 1) targetPage = 1;

            main.goToPage(targetPage);

            if (this.active !== 'search' && options.thumbsCloseOnClick) {
                main.toggleThumbs(false);
            }
        });
    }

    searchString(str) {
        if (str) {
            this.clearInput.classList.remove('flipbook-hidden');
        } else {
            this.clearInput.classList.add('flipbook-hidden');
        }

        if (this.searchTimeout) clearTimeout(this.searchTimeout);
        this.searchTimeout = setTimeout(() => {
            var main = this.main;
            var pdfService = main.pdfService;
            if (str !== '') {
                var options = main.options;
                var matchesFound = 0;
                this.hideAllThumbs();
                this.clearSearchResults();
                this.pagesFound = 0;
                main.unmark();
                main.searchingString = str;
                if (pdfService) {
                    for (var i = 0; i < pdfService.info.numPages; i++) {
                        pdfService.findInPage(str, i, (matches, htmlContent, index, pageText) => {
                            if (matches.length > 0) {
                                this.pagesFound++;
                                matchesFound += matches.length;
                                main.mark(str);
                                if (options.searchResultsThumbs) this.showThumb(index);
                                else this.showSearchResults(matches.length, index, pageText);
                            }
                        });
                    }
                } else {
                    options.pagesOriginal.forEach((_, index) => {
                        const originalIndex = index;
                        if (!options.cover) {
                            index++;
                        }
                        var pi = index;
                        if (options.doublePage) {
                            pi *= 2;
                        }
                        if (options.doublePage && pi === options.pagesOriginal.length * 2 - 2) {
                            pi--;
                        }
                        main.loadPageHTML(pi, (htmlContent, index) => {
                            var matchCount = (
                                htmlContent.innerText
                                    .toUpperCase()
                                    .match(
                                        new RegExp(
                                            main.searchingString.toUpperCase().replace(/[.*+?^${}()|[\]\\]/g, '\\$&'),
                                            'g'
                                        )
                                    ) || []
                            ).length;
                            if (matchCount > 0) {
                                matchesFound += matchCount;
                                this.showSearchResults(
                                    matchCount,
                                    originalIndex,
                                    htmlContent.innerText.substring(0, 60) + '...'
                                );
                                this.pagesFound++;
                                main.mark(str);
                            }
                        });
                    });
                }
            } else {
                this.hideAllThumbs();
                this.clearSearchResults();
                main.unmark();
                main.searchingString = str;
                this.clearInput.classList.add('flipbook-hidden');
            }
        });
    }

    getThumbIndexForPage(pageIndex) {
        return pageIndex;
    }

    loadVisibleThumbs() {}
    getThumbFromPdf(pdfPageIndex, isLeft, isRight) {
        var c = document.createElement('canvas');

        this.main.pdfService.pdfDocument.getPage(pdfPageIndex).then((pdfPage) => {
            var v = pdfPage.getViewport({ scale: 1 });
            var scale = this.options.thumbSize / v.height;
            var offsetX = 0;
            var canvasWidth = scale * v.width;
            if (this.options.doublePage && (isLeft || isRight)) {
                canvasWidth = (scale * v.width) / 2;
                if (isRight) {
                    offsetX = -canvasWidth;
                }
            }
            var viewport = pdfPage.getViewport({ scale: scale, offsetX: offsetX });
            var context = c.getContext('2d');
            c.height = viewport.height;
            c.width = canvasWidth;
            var renderContext = {
                canvasContext: context,
                viewport: viewport,
            };
            pdfPage.cleanupAfterRender = true;
            var renderTask = pdfPage.render(renderContext);
            renderTask.promise.then(function () {
                pdfPage.cleanup();
            });
        });
        return c;
    }
    showAllThumbs() {
        this.thumbs.forEach((thumb) => {
            thumb.classList.remove('flipbook-hidden');
        });
        if (this.isOverlayMode) this.showSpreads();
        this.clearSearchResults();
    }
    hideAllThumbs() {
        this.thumbs.forEach((thumb) => {
            thumb.classList.add('flipbook-hidden');
        });
    }
    clearSearchResults() {
        this.thumbsScroller.querySelectorAll('.flipbook-search-match').forEach((match) => match.remove());
    }

    showSearchResults(matches, pageIndex, str) {
        const { main, options } = this;
        const { doublePage, strings } = main.options;

        let displayPageTitle;
        let adjustedPageIndex = pageIndex;
        const totalPages = options.pages.length;

        if (doublePage && pageIndex > 0) {
            adjustedPageIndex = pageIndex * 2 - 1;

            // Check if this is a valid spread (not first page and next page exists)
            const nextPageIndex = adjustedPageIndex + 1;
            if (nextPageIndex < totalPages) {
                // Valid spread - show "X-Y" format
                displayPageTitle = `${adjustedPageIndex + 1}-${nextPageIndex + 1}`;
            } else {
                // Last page or invalid spread - show single page
                displayPageTitle = String(adjustedPageIndex + 1);
            }
        } else {
            // Single page display
            displayPageTitle = String(pageIndex + 1);
        }

        // Create search match element
        const searchMatch = document.createElement('div');
        searchMatch.className = 'flipbook-search-match';
        searchMatch.dataset.page = adjustedPageIndex + 1; // Store first page of spread for navigation
        searchMatch.style.order = adjustedPageIndex;

        // Use template literal for better performance with static parts
        const matchString = matches === 1 ? strings.match : strings.matches;
        searchMatch.innerHTML = `
        <div class="flipbook-search-match-title">
            <span style="float:left"><strong>${strings.page} ${displayPageTitle}</strong></span>
            <span style="float:right">${matches} ${matchString}</span>
        </div>
        <div class="flipbook-search-match-text">${str}</div>
    `;

        // Add event listener
        searchMatch.addEventListener('click', (e) => {
            e.stopPropagation();
            e.preventDefault();
            const targetPage = Number(searchMatch.dataset.page);
            main.goToPage(targetPage);
        });

        // Append to container and hide spreads
        this.thumbsScroller.appendChild(searchMatch);
        this.hideSpreads();
    }

    showThumb(index) {
        if (this.thumbs[index]) {
            this.thumbs[index].classList.remove('flipbook-hidden');
        }
    }
    hideThumb(index) {
        this.thumbs[index].classList.add('flipbook-hidden');
    }
    showeCloseButtons(visible = true) {
        this.thumbs.forEach((thumnb) => {
            const btnClose = thumnb.querySelector('.thumb-btn-close');
            const action = visible ? 'remove' : 'add';
            btnClose.classList[action]('flipbook-hidden');
        });
    }
    showBookmarks() {
        this.showeCloseButtons(true);
        this.showBookmarkedThumbs();
        this.clearSearchResults();
        this.bookmark.classList.remove('flipbook-hidden');
        this.setTitle(this.options.strings.bookmarks);
        this.main.updateCurrentPage();
        this.active = 'bookmarks';
        this.thumbHolder.classList.remove('flipbook-thumbs-grid');
    }
    showSearch() {
        this.clearSearchResults();
        this.hideAllThumbs();
        this.search.classList.remove('flipbook-hidden');
        this.showeCloseButtons(false);
        this.setTitle(this.options.strings.search);
        this.findInput.value = '';
        this.clearInput.classList.add('flipbook-hidden');
        this.findInput.focus({ preventScroll: true });
        this.active = 'search';
        this.thumbHolder.classList.remove('flipbook-thumbs-grid');
    }
    showBookmarkedThumbs() {
        var arr = this.main.getBookmarkedPages();
        this.hideAllThumbs();
        this.showSingles();
        for (var i = 0; i < arr.length; i++) {
            var page = arr[i];
            if (page) {
                var thumbIndex = this.getThumbIndexForPage(page);
                this.showThumb(thumbIndex);
            }
        }
    }
    show() {
        this.setTitle(this.options.strings.thumbnails);
        this.bookmark.classList.add('flipbook-hidden');
        this.search.classList.add('flipbook-hidden');
        this.thumbHolder.classList.remove('flipbook-hidden');
        this.main.thumbsVertical();
        this.showAllThumbs();
        this.showeCloseButtons(false);
        this.loadVisibleThumbs();
        this.main.resize();
        this.active = 'thumbs';
        if (this.main.options.thumbsStyle === 'overlay') {
            this.thumbHolder.classList.add('flipbook-thumbs-grid');
            if (this.options.rightToLeft) {
                this.thumbsScroller.style.direction = 'rtl';
            }
        }
        this.updateCurrentPages();
    }
    hide() {
        this.thumbHolder.classList.add('flipbook-hidden');
        this.main.resize();
        this.active = null;
    }
    setTitle(str) {
        this.thumbHolder.querySelector('.flipbook-menu-title').textContent = str;
    }
    updateCurrentPages() {
        if (!this.active) return;
        if (!this.spreadsShowing) return;
        // Build once
        if (!this.thumbsByPage) {
            this.thumbsByPage = new Map();
            this.thumbs.forEach((el) => {
                const pagesStr = el.getAttribute('data-pages');
                if (pagesStr) {
                    const pages = pagesStr
                        .split(',')
                        .map((s) => Number(s))
                        .filter(Number.isFinite);
                    pages.forEach((p) => this.thumbsByPage.set(p, el));
                }
            });
        }
        const prev = this.prevActive || new Set();
        // currentPageValue supports "2" or "2-3"
        const raw = (this.main?.currentPageValue ?? '').toString().trim();
        if (!raw) return;
        const pages = raw
            .split('-')
            .map((s) => Number(s))
            .filter(Number.isFinite);
        const next = new Set(pages);
        // Minimal DOM writes: toggle only for pages that changed
        const union = new Set([...prev, ...next]);
        for (const page of union) {
            const el = this.thumbsByPage.get(page);
            if (!el) continue;
            el.classList.toggle('flipbook-thumb-active', next.has(page));
        }
        const active = this.thumbsScroller.querySelector('.flipbook-thumb-active');
        if (active) {
            const container = this.thumbsWrapper;
            const cRect = container.getBoundingClientRect();
            const aRect = active.getBoundingClientRect();
            const margin = 100;
            const dy = aRect.top - cRect.top - margin;
            const dx = aRect.left - cRect.left - margin;
            container.scrollTo({
                top: container.scrollTop + dy,
                behavior: 'smooth',
                block: 'start',
            });
        }
        this.prevActive = next;
    }
};

FLIPBOOK.Lightbox = class {
    constructor(context, content, options) {
        this.context = context;
        this.options = options;

        this.$document = document;
        this.$body = document.body;
        this.$html = document.documentElement;
        this.$window = window;

        this.overlay = document.createElement('div');
        this.overlay.className = 'flipbook-overlay';
        this.overlay.classList.add('flipbook-hidden');
        this.overlay.style.top = this.options.lightboxMarginV;
        this.overlay.style.bottom = this.options.lightboxMarginV;
        this.overlay.style.left = this.options.lightboxMarginH;
        this.overlay.style.right = this.options.lightboxMarginH;
        Object.assign(this.overlay.style, options.lightboxCSS);
        document.body.appendChild(this.overlay);

        if (options.lightboxBackground) {
            this.overlay.style.background = options.lightboxBackground;
        }

        if (options.lightboxBackgroundColor) {
            this.overlay.style.background = options.lightboxBackgroundColor;
        }

        if (options.lightboxBackgroundPattern) {
            this.overlay.style.background = 'url(' + options.lightboxBackgroundPattern + ') repeat';
        }

        if (options.lightboxBackgroundImage) {
            this.overlay.style.background = 'url(' + options.lightboxBackgroundImage + ') no-repeat';
            this.overlay.style.backgroundSize = 'cover';
            this.overlay.style.backgroundPosition = 'center center';
        }

        document.addEventListener('keydown', (e) => {
            if (e.key === 'Escape') {
                this.closeLightbox();
            }
        });

        this.wrapper = document.createElement('div');
        this.wrapper.style.height = 'auto';
        this.wrapper.className = 'flipbook-wrapper-transparent';
        this.wrapper.style.margin = '0px auto';
        this.wrapper.style.padding = '0px';
        this.wrapper.style.height = '100%';
        this.wrapper.style.width = '100%';
        this.overlay.appendChild(this.wrapper);

        this.wrapper.appendChild(content);

        var toolbar = document.createElement('div');
        toolbar.className = 'flipbook-lightbox-toolbar';
        this.wrapper.appendChild(toolbar);
    }

    openLightbox() {
        if (this.lightboxOpened) {
            return;
        }

        this.lightboxOpened = true;

        this.showOverlay();

        const lightboxOpenEvent = new Event('r3d-lightboxopen');
        window.dispatchEvent(lightboxOpenEvent);

        if (!this.options.deeplinkingEnabled) {
            window.history.pushState(null, '', window.location.href);
            this.context.historyStateChange();
        }

        if (this.context.options.password && !this.context.pdfinitStarted && this.context.initialized) {
            this.context.initPdf();
        }
    }

    showOverlay() {
        if (!this.overlay || !this.$html) return;

        const element = this.overlay;
        element.classList.remove('flipbook-hidden');
        element.classList.add('flipbook-overlay-visible');

        this.context.saveScrollPosition();

        document.body.classList.add('flipbook-overflow-hidden');
        this.$html.classList.add('flipbook-overflow-hidden');
    }

    hideOverlay() {
        if (!this.overlay || !this.$html) return;

        const element = this.overlay;
        element.classList.remove('flipbook-overlay-visible');

        element.addEventListener(
            'transitionend',
            () => {
                element.classList.add('flipbook-hidden');
            },
            { once: true }
        );

        document.body.classList.remove('flipbook-overflow-hidden');
        this.$html.classList.remove('flipbook-overflow-hidden');

        this.context.restoreScrollPosition();
    }

    closeLightbox(popState) {
        if (!this.lightboxOpened /*|| !this.context.Book || !this.context.Book.enabled*/) {
            return;
        }

        this.lightboxOpened = false;

        this.hideOverlay();

        const lightboxCloseEvent = new Event('r3d-lightboxclose');
        window.dispatchEvent(lightboxCloseEvent);

        this.context.trigger('lightboxclose');

        this.context.fullscreenElement.classList.remove('flipbook-browser-fullscreen');

        this.context.lightboxEnd();

        if (!popState && !this.options.deeplinkingEnabled) {
            history.back();
        }
    }

    disposeLightbox() {
        this.lightboxOpened = false;

        this.hideOverlay();

        const lightboxCloseEvent = new Event('r3d-lightboxclose');
        window.dispatchEvent(lightboxCloseEvent);

        this.context.trigger('lightboxclose');

        this.context.fullscreenElement.classList.remove('flipbook-browser-fullscreen');

        this.context.lightboxEnd();

        this.context.disposed = true;
    }
};

FLIPBOOK.onPageLinkClick = function (link) {
    var id = link.dataset.bookid;
    var page = link.dataset.page;
    if (page) {
        FLIPBOOK.books[id].goToPage(Number(page));
    }
    var _url = link.dataset.url;
    if (_url) {
        window.open(_url, '_blank');
    }
};

FLIPBOOK.easings = {
    linear: function (t) {
        return t;
    },
    easeInQuad: function (t) {
        return t * t;
    },
    easeOutQuad: function (t) {
        return t * (2 - t);
    },
    easeInOutQuad: function (t) {
        return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
    },
    easeInCubic: function (t) {
        return t * t * t;
    },
    easeOutCubic: function (t) {
        return --t * t * t + 1;
    },
    easeInOutCubic: function (t) {
        return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;
    },
    easeInQuart: function (t) {
        return t * t * t * t;
    },
    easeOutQuart: function (t) {
        return 1 - --t * t * t * t;
    },
    easeInOutQuart: function (t) {
        return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * --t * t * t * t;
    },
    easeInQuint: function (t) {
        return t * t * t * t * t;
    },
    easeOutQuint: function (t) {
        return 1 + --t * t * t * t * t;
    },
    easeInOutQuint: function (t) {
        return t < 0.5 ? 16 * t * t * t * t * t : 1 + 16 * --t * t * t * t * t;
    },
    easeInSine: function (t) {
        return 1 - Math.cos((t * Math.PI) / 2);
    },
    easeOutSine: function (t) {
        return Math.sin((t * Math.PI) / 2);
    },
    easeInOutSine: function (t) {
        return 0.5 * (1 - Math.cos(Math.PI * t));
    },
};

FLIPBOOK.animate = function (params) {
    let start = performance.now();
    let from = params.from;
    let to = params.to;
    let duration = params.duration;
    let change = to - from;
    let easing = FLIPBOOK.easings[params.easing] || FLIPBOOK.easings.linear;
    let rafId = null;
    let pausedAt = null;
    let repeatCount = params.repeat || 1;
    let yoyo = params.yoyo || false;
    let currentIteration = 0;
    let reversed = false;
    let delay = params.delay || 0;

    function animate() {
        let now = performance.now();
        let timeElapsed = pausedAt !== null ? pausedAt - start : now - start;

        if (timeElapsed < delay) {
            rafId = requestAnimationFrame(animate);
            return;
        }

        timeElapsed -= delay; // Adjust timeElapsed after delay
        let progress = Math.min(timeElapsed / duration, 1);
        let value;

        if (reversed) {
            value = from + change * easing(1 - progress);
        } else {
            value = from + change * easing(progress);
        }

        if (params.step) {
            params.step(value);
        }

        if (progress < 1) {
            rafId = requestAnimationFrame(animate);
        } else {
            currentIteration++;
            if (currentIteration < repeatCount) {
                if (yoyo) {
                    reversed = !reversed;
                }
                start = performance.now();
                rafId = requestAnimationFrame(animate);
            } else {
                if (params.step) {
                    params.step(to);
                }
                if (params.complete) {
                    params.complete();
                }
            }
        }
    }

    function pause() {
        if (rafId) {
            cancelAnimationFrame(rafId);
            pausedAt = performance.now();
        }
    }

    function resume() {
        if (pausedAt) {
            start += performance.now() - pausedAt;
            pausedAt = null;
            rafId = requestAnimationFrame(animate);
        }
    }

    function stop() {
        if (rafId) {
            cancelAnimationFrame(rafId);
        }
    }

    if (delay > 0) {
        setTimeout(() => {
            start = performance.now(); // Reset start time after delay
            rafId = requestAnimationFrame(animate);
        }, delay);
    } else {
        rafId = requestAnimationFrame(animate);
    }

    return {
        pause,
        resume,
        stop,
    };
};
FLIPBOOK.extend = function () {
    function isPlainObject(obj) {
        return Object.prototype.toString.call(obj) === '[object Object]';
    }

    var options,
        name,
        src,
        copy,
        copyIsArray,
        clone,
        target = arguments[0] || {},
        i = 1,
        length = arguments.length,
        deep = false;

    // Handle a deep copy situation
    if (typeof target === 'boolean') {
        deep = target;
        target = arguments[1] || {};
        // Skip the boolean and the target
        i = 2;
    }

    // Handle case when target is a string or something (possible in deep copy)
    if (typeof target !== 'object' && typeof target !== 'function') {
        target = {};
    }

    // Extend the target object if only one argument is passed
    if (length === i) {
        target = this;
        --i;
    }

    for (; i < length; i++) {
        // Only deal with non-null/undefined values
        if ((options = arguments[i]) != null) {
            // Extend the base object
            for (name in options) {
                if (Object.prototype.hasOwnProperty.call(options, name)) {
                    src = target[name];
                    copy = options[name];

                    // Prevent never-ending loop
                    if (target === copy) {
                        continue;
                    }

                    // Recurse if we're merging plain objects or arrays
                    if (deep && copy && (isPlainObject(copy) || (copyIsArray = Array.isArray(copy)))) {
                        if (copyIsArray) {
                            copyIsArray = false;
                            clone = src && Array.isArray(src) ? src : [];
                        } else {
                            clone = src && isPlainObject(src) ? src : {};
                        }

                        // Never move original objects, clone them
                        target[name] = FLIPBOOK.extend(deep, clone, copy);

                        // Don't bring in undefined values
                    } else if (copy !== undefined) {
                        target[name] = copy;
                    }
                }
            }
        }
    }

    // Return the modified object
    return target;
};

FLIPBOOK.Tooltip2 = class {
    constructor(wrapper) {
        this.wrapper = wrapper;
        this.tooltipEl = null;
        this.init();
    }

    init() {
        this.tooltipEl = document.createElement('span');
        this.tooltipEl.className = 'flipbook-tooltip-element skin-color skin-color-bg';
        this.tooltipEl.setAttribute('role', 'tooltip');
        this.tooltipEl.id = 'flipbook-tooltip';
        this.wrapper.appendChild(this.tooltipEl);

        this.wrapper.addEventListener('mouseover', this.handleMouseOver.bind(this));
        this.wrapper.addEventListener('mouseout', this.handleMouseOut.bind(this));
        this.wrapper.addEventListener('focusin', this.handleFocusIn.bind(this));
        this.wrapper.addEventListener('focusout', this.handleMouseOut.bind(this));
        this.wrapper.addEventListener('touchstart', this.handleTouchStart.bind(this), { passive: true });
    }

    handleMouseOver(e) {
        const target = e.target.closest('.flipbook-has-tooltip');
        if (target && !target.classList.contains('disabled')) {
            this.showTooltip(target);
        }
    }

    handleFocusIn(e) {
        const target = e.target.closest('.flipbook-has-tooltip');
        if (target && !target.classList.contains('disabled')) {
            target.setAttribute('aria-describedby', 'flipbook-tooltip');
            this.showTooltip(target);
        }
    }

    handleTouchStart(e) {
        const target = e.target.closest('.flipbook-has-tooltip');
        if (target && !target.classList.contains('disabled')) {
            // e.preventDefault();
            this.showTooltip(target);
            setTimeout(() => {
                this.hideTooltip();
            }, 2000);
        }
    }

    handleMouseOut() {
        this.hideTooltip();
    }

    showTooltip(target) {
        this.tooltipEl.innerText = target.dataset.tooltip;
        this.tooltipEl.style.opacity = 0;
        this.tooltipEl.style.display = 'block';

        const targetRect = target.getBoundingClientRect();
        const tooltipRect = this.tooltipEl.getBoundingClientRect();
        const wrapperRect = this.wrapper.getBoundingClientRect();

        let top = targetRect.top - wrapperRect.top - tooltipRect.height - 10;
        let left = targetRect.left - wrapperRect.left + (targetRect.width - tooltipRect.width) / 2;
        let isBelow = false;

        // Calculate arrow position (center of target relative to tooltip)
        let arrowLeft = targetRect.left - wrapperRect.left + targetRect.width / 2 - left;
        arrowLeft = Math.max(6, Math.min(tooltipRect.width - 6, arrowLeft));

        // WRAPPER boundary checks instead of viewport
        // If tooltip goes above wrapper
        if (top < 0) {
            top = targetRect.bottom - wrapperRect.top + 10;
            isBelow = true;
        }
        // If tooltip goes below wrapper
        if (top + tooltipRect.height > wrapperRect.height) {
            top = wrapperRect.height - tooltipRect.height - 5;
        }
        // If tooltip goes left of wrapper
        if (left < 0) {
            left = 5;
            arrowLeft = targetRect.left - wrapperRect.left + targetRect.width / 2 - left;
            arrowLeft = Math.max(6, Math.min(tooltipRect.width - 6, arrowLeft));
        }
        // If tooltip goes right of wrapper
        if (left + tooltipRect.width > wrapperRect.width) {
            left = wrapperRect.width - tooltipRect.width - 5;
            arrowLeft = targetRect.left - wrapperRect.left + targetRect.width / 2 - left;
            arrowLeft = Math.max(6, Math.min(tooltipRect.width - 6, arrowLeft));
        }

        top += this.wrapper.scrollTop;
        left += this.wrapper.scrollLeft;

        this.tooltipEl.style.top = `${top}px`;
        this.tooltipEl.style.left = `${left}px`;
        this.tooltipEl.style.setProperty('--arrow-left', `${arrowLeft}px`);
        this.tooltipEl.style.opacity = 1;
        this.tooltipEl.classList.toggle('below', isBelow);
    }

    hideTooltip() {
        this.tooltipEl.style.opacity = 0;
        this.tooltipEl.style.display = 'none';
        this.tooltipEl.removeAttribute('aria-describedby');
    }
};
