var kalon = kalon || {};

// event "polyfill"
kalon.createEvent = function( eventName ) {
    var event;
    if ( typeof window.Event === 'function' ) {
        event = new Event( eventName );
    } else {
        event = document.createEvent( 'Event' );
        event.initEvent( eventName, true, false );
    }
    return event;
};

/*  -----------------------------------------------------------------------------------------------
    Cover Modals
--------------------------------------------------------------------------------------------------- */

kalon.coverModals = {

    init: function() {
        if ( document.querySelector( '.cover-modal' ) ) {
            // Handle cover modals when they're toggled.
            this.onToggle();

            // Close on escape key press.
            this.closeOnEscape();

            // Hide and show modals before and after their animations have played out.
            this.hideAndShowModals();

            this.keepFocusInModal();
        }
    },

    // Handle cover modals when they're toggled.
    onToggle: function() {
        document.querySelectorAll( '.cover-modal' ).forEach( function( element ) {
            element.addEventListener( 'toggled', function( event ) {
                var modal = event.target,
                    body = document.body;

                if ( modal.classList.contains( 'active' ) ) {
                    body.classList.add( 'showing-modal' );
                } else {
                    body.classList.remove( 'showing-modal' );
                    body.classList.add( 'hiding-modal' );

                    // Remove the hiding class after a delay, when animations have been run.
                    setTimeout( function() {
                        body.classList.remove( 'hiding-modal' );
                    }, 500 );
                }
            } );
        } );
    },

    // Close modal on escape key press.
    closeOnEscape: function() {
        document.addEventListener( 'keydown', function( event ) {
            if ( event.keyCode === 27 ) {
                event.preventDefault();
                document.querySelectorAll( '.cover-modal.active' ).forEach( function( element ) {
                    this.untoggleModal( element );
                }.bind( this ) );
            }
        }.bind( this ) );
    },

    // Hide and show modals before and after their animations have played out.
    hideAndShowModals: function() {
        var _doc = document,
            _win = window,
            modals = _doc.querySelectorAll( '.cover-modal' ),
            htmlStyle = _doc.documentElement.style,
            adminBar = _doc.querySelector( '#wpadminbar' );

        function getAdminBarHeight( negativeValue ) {
            var height,
                currentScroll = _win.pageYOffset;

            if ( adminBar ) {
                height = currentScroll + adminBar.getBoundingClientRect().height;

                return negativeValue ? -height : height;
            }

            return currentScroll === 0 ? 0 : -currentScroll;
        }

        function htmlStyles() {
            var overflow = _win.innerHeight > _doc.documentElement.getBoundingClientRect().height;

            return {
                'overflow-y': overflow ? 'hidden' : 'scroll',
                position: 'fixed',
                width: '100%',
                top: getAdminBarHeight( true ) + 'px',
                left: 0
            };
        }

        // Show the modal.
        modals.forEach( function( modal ) {
            modal.addEventListener( 'toggle-target-before-inactive', function( event ) {
                var styles = htmlStyles(),
                    offsetY = _win.pageYOffset,
                    paddingTop = ( Math.abs( getAdminBarHeight() ) - offsetY ) + 'px',
                    mQuery = _win.matchMedia( '(max-width: 600px)' );

                if ( event.target !== modal ) {
                    return;
                }

                Object.keys( styles ).forEach( function( styleKey ) {
                    htmlStyle.setProperty( styleKey, styles[ styleKey ] );
                } );

                _win.kalon.scrolled = parseInt( styles.top, 10 );

                if ( adminBar ) {
                    _doc.body.style.setProperty( 'padding-top', paddingTop );

                    if ( mQuery.matches ) {
                        if ( offsetY >= getAdminBarHeight() ) {
                            modal.style.setProperty( 'top', 0 );
                        } else {
                            modal.style.setProperty( 'top', ( getAdminBarHeight() - offsetY ) + 'px' );
                        }
                    }
                }

                modal.classList.add( 'show-modal' );
            } );

            // Hide the modal after a delay, so animations have time to play out.
            modal.addEventListener( 'toggle-target-after-inactive', function( event ) {
                if ( event.target !== modal ) {
                    return;
                }

                setTimeout( function() {
                    var clickedEl = kalon.toggles.clickedEl;

                    modal.classList.remove( 'show-modal' );

                    Object.keys( htmlStyles() ).forEach( function( styleKey ) {
                        htmlStyle.removeProperty( styleKey );
                    } );

                    if ( adminBar ) {
                        _doc.body.style.removeProperty( 'padding-top' );
                        modal.style.removeProperty( 'top' );
                    }

                    if ( clickedEl !== false ) {
                        clickedEl.focus();
                        clickedEl = false;
                    }

                    _win.scrollTo( 0, Math.abs( _win.kalon.scrolled + getAdminBarHeight() ) );

                    _win.kalon.scrolled = 0;
                }, 500 );
            } );
        } );
    },

    // Untoggle a modal.
    untoggleModal: function( modal ) {
        var modalTargetClass,
            modalToggle = false;

        // If the modal has specified the string (ID or class) used by toggles to target it, untoggle the toggles with that target string.
        // The modal-target-string must match the string toggles use to target the modal.
        if ( modal.dataset.modalTargetString ) {
            modalTargetClass = modal.dataset.modalTargetString;

            modalToggle = document.querySelector( '*[data-toggle-target="' + modalTargetClass + '"]' );
        }

        // If a modal toggle exists, trigger it so all of the toggle options are included.
        if ( modalToggle ) {
            modalToggle.click();

            // If one doesn't exist, just hide the modal.
        } else {
            modal.classList.remove( 'active' );
        }
    },

    keepFocusInModal: function() {
        var _doc = document;

        _doc.addEventListener( 'keydown', function( event ) {
            var toggleTarget, modal, selectors, elements, menuType, bottomMenu, activeEl, lastEl, firstEl, tabKey, shiftKey,
                clickedEl = kalon.toggles.clickedEl;

            if ( clickedEl && _doc.body.classList.contains( 'showing-modal' ) ) {
                toggleTarget = clickedEl.dataset.toggleTarget;
                selectors = 'input, a, button';
                modal = _doc.querySelector( toggleTarget );

                elements = modal.querySelectorAll( selectors );
                elements = Array.prototype.slice.call( elements );

                if ( '.menu-modal' === toggleTarget ) {
                    menuType = window.matchMedia( '(min-width: 768px)' ).matches;
                    menuType = menuType ? '.expanded-menu' : '.mobile-menu';

                    elements = elements.filter( function( element ) {
                        return null !== element.closest( menuType ) && null !== element.offsetParent;
                    } );

                    elements.unshift( _doc.querySelector( '.close-nav-toggle' ) );

                    bottomMenu = _doc.querySelector( '.menu-bottom > nav' );

                    if ( bottomMenu ) {
                        bottomMenu.querySelectorAll( selectors ).forEach( function( element ) {
                            elements.push( element );
                        } );
                    }
                }

                if ( '.main-menu-modal' === toggleTarget ) {
                    menuType = window.matchMedia( '(min-width: 1025px)' ).matches;
                    menuType = menuType ? '.expanded-menu' : '.mobile-menu';

                    elements = elements.filter( function( element ) {
                        return null !== element.closest( menuType ) && null !== element.offsetParent;
                    } );

                    elements.unshift( _doc.querySelector( '.close-main-nav-toggle' ) );

                    bottomMenu = _doc.querySelector( '.menu-bottom > nav' );

                    if ( bottomMenu ) {
                        bottomMenu.querySelectorAll( selectors ).forEach( function( element ) {
                            elements.push( element );
                        } );
                    }
                }

                lastEl = elements[ elements.length - 1 ];
                firstEl = elements[0];
                activeEl = _doc.activeElement;
                tabKey = event.keyCode === 9;
                shiftKey = event.shiftKey;

                if ( ! shiftKey && tabKey && lastEl === activeEl ) {
                    event.preventDefault();
                    firstEl.focus();
                }

                if ( shiftKey && tabKey && firstEl === activeEl ) {
                    event.preventDefault();
                    lastEl.focus();
                }
            }
        } );
    }

}; // kalon.coverModals

kalon.modalMenu = {

    init: function() {
        // If the current menu item is in a sub level, expand all the levels higher up on load.
        this.expandLevel();
    },

    expandLevel: function() {
        var modalMenus = document.querySelectorAll( '.modal-menu' );

        modalMenus.forEach( function( modalMenu ) {
            var activeMenuItem = modalMenu.querySelector( '.current-menu-item' );

            if ( activeMenuItem ) {
                kalonFindParents( activeMenuItem, 'li' ).forEach( function( element ) {
                    var subMenuToggle = element.querySelector( '.submenu-toggle' );
                    if ( subMenuToggle ) {
                        kalon.toggles.performToggle( subMenuToggle, true );
                    }
                } );
            }
        } );
    },
}; // kalon.modalMenu

kalon.toggles = {

    clickedEl: false,

    init: function() {
        // Do the toggle.
        this.toggle();
    },

    performToggle: function( element, instantly ) {
        var target, timeOutTime, classToToggle,
            self = this,
            _doc = document,
            // Get our targets.
            toggle = element,
            targetString = toggle.dataset.toggleTarget,
            activeClass = 'active';

        // Elements to focus after modals are closed.
        if ( ! _doc.querySelectorAll( '.show-modal' ).length ) {
            self.clickedEl = _doc.activeElement;
        }

        if ( targetString === 'next' ) {
            target = toggle.nextSibling;
        } else {
            target = _doc.querySelector( targetString );
        }

        // Trigger events on the toggle targets before they are toggled.
        if ( target.classList.contains( activeClass ) ) {
            target.dispatchEvent( kalon.createEvent( 'toggle-target-before-active' ) );
        } else {
            target.dispatchEvent( kalon.createEvent( 'toggle-target-before-inactive' ) );
        }

        // Get the class to toggle, if specified.
        classToToggle = toggle.dataset.classToToggle ? toggle.dataset.classToToggle : activeClass;

        // For cover modals, set a short timeout duration so the class animations have time to play out.
        timeOutTime = 0;

        if ( target.classList.contains( 'cover-modal' ) ) {
            timeOutTime = 10;
        }

        setTimeout( function() {
            var focusElement,
                subMenued = target.classList.contains( 'sub-menu' ),
                newTarget = subMenued ? toggle.closest( '.menu-item' ).querySelector( '.sub-menu' ) : target,
                duration = toggle.dataset.toggleDuration;

            // Toggle the target of the clicked toggle.
            if ( toggle.dataset.toggleType === 'slidetoggle' && ! instantly && duration !== '0' ) {
                kalonMenuToggle( newTarget, duration );
            } else {
                newTarget.classList.toggle( classToToggle );
            }

            // If the toggle target is 'next', only give the clicked toggle the active class.
            if ( targetString === 'next' ) {
                toggle.classList.toggle( activeClass );
            } else if ( target.classList.contains( 'sub-menu' ) ) {
                toggle.classList.toggle( activeClass );
            } else {
                // If not, toggle all toggles with this toggle target.
                _doc.querySelector( '*[data-toggle-target="' + targetString + '"]' ).classList.toggle( activeClass );
            }

            // Toggle aria-expanded on the toggle.
            kalonToggleAttribute( toggle, 'aria-expanded', 'true', 'false' );

            if ( self.clickedEl && -1 !== toggle.getAttribute( 'class' ).indexOf( 'close-' ) ) {
                kalonToggleAttribute( self.clickedEl, 'aria-expanded', 'true', 'false' );
            }

            // Toggle body class.
            if ( toggle.dataset.toggleBodyClass ) {
                _doc.body.classList.toggle( toggle.dataset.toggleBodyClass );
            }

            // Check whether to set focus.
            if ( toggle.dataset.setFocus ) {
                focusElement = _doc.querySelector( toggle.dataset.setFocus );

                if ( focusElement ) {
                    if ( target.classList.contains( activeClass ) ) {
                        focusElement.focus();
                    } else {
                        focusElement.blur();
                    }
                }
            }

            // Trigger the toggled event on the toggle target.
            target.dispatchEvent( kalon.createEvent( 'toggled' ) );

            // Trigger events on the toggle targets after they are toggled.
            if ( target.classList.contains( activeClass ) ) {
                target.dispatchEvent( kalon.createEvent( 'toggle-target-after-active' ) );
            } else {
                target.dispatchEvent( kalon.createEvent( 'toggle-target-after-inactive' ) );
            }
        }, timeOutTime );
    },

    // Do the toggle.
    toggle: function() {
        var self = this;

        document.querySelectorAll( '*[data-toggle-target]' ).forEach( function( element ) {
            element.addEventListener( 'click', function( event ) {
                event.preventDefault();
                self.performToggle( element );
            } );
        } );
    },

}; // kalon.toggles

/**
 * Is the DOM ready?
 *
 * This implementation is coming from https://gomakethings.com/a-native-javascript-equivalent-of-jquerys-ready-method/
 *
 * @param {Function} fn Callback function to run.
 */
function kalonDomReady( fn ) {
    if ( typeof fn !== 'function' ) {
        return;
    }

    if ( document.readyState === 'interactive' || document.readyState === 'complete' ) {
        return fn();
    }

    document.addEventListener( 'DOMContentLoaded', fn, false );
}

kalonDomReady( function() {
    kalon.toggles.init();              // Handle toggles.
    kalon.coverModals.init();          // Handle cover modals.
} );

/* Toggle an attribute ----------------------- */

function kalonToggleAttribute( element, attribute, trueVal, falseVal ) {
    if ( trueVal === undefined ) {
        trueVal = true;
    }
    if ( falseVal === undefined ) {
        falseVal = false;
    }
    if ( element.getAttribute( attribute ) !== trueVal ) {
        element.setAttribute( attribute, trueVal );
    } else {
        element.setAttribute( attribute, falseVal );
    }
}

/**
 * Traverses the DOM up to find elements matching the query.
 *
 * @param {HTMLElement} target
 * @param {string} query
 * @return {NodeList} parents matching query
 */
function kalonFindParents( target, query ) {
    var parents = [];

    // Recursively go up the DOM adding matches to the parents array.
    function traverse( item ) {
        var parent = item.parentNode;
        if ( parent instanceof HTMLElement ) {
            if ( parent.matches( query ) ) {
                parents.push( parent );
            }
            traverse( parent );
        }
    }

    traverse( target );

    return parents;
}