# All files / assets/js gfmr-core.js

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     /**
     * WP GFM Core v2.0 - Main Orchestration Engine
     *
     * Main engine handling initialization, coordination, and external API provision
     * Integrates all v2 architecture modules and provides external API
     *
     * Consolidates 4 files into one:
     * - gfmr-renderer.js (main processing)
     * - gfmr-unified-renderer.js (integration)
     * - gfmr-metadata-manager.js (metadata management)
     * - gfmr-editor-integration.js (editor integration)
     *
     * @package WpGfmRenderer
     * @since 2.0.0
     * @requires gfmr-utils-v2.js
     */

    (function(global) {
        'use strict';

        /**
         * WP GFM Core - Main Orchestration Engine
         */
        class WPGFMCore {
            constructor() {
                // Core modules
                this.utils = null;
                this.highlighter = null;
                this.diagrams = null;
                this.assets = null;
                this.ui = null;

                // Initialization state
                this.initialized = false;
                this.initializationPromise = null;
                this.modules = new Map();
                this.moduleLoadOrder = ['utils', 'assets', 'highlighter', 'diagrams', 'ui'];

                // Processing state
                this.processedContent = new WeakSet();
                this.processingQueue = [];
                this.isProcessing = false;

                // Metadata management
                this.contentMetadata = new Map();
                this.blockMetadata = new Map();
                this.renderingHistory = new Map();

                // Editor integration
                this.editorIntegration = {
                    enabled: false,
                    hooks: new Map(),
                    observers: new Map()
                };

                // Performance statistics
                this.performanceStats = {
                    initTime: 0,
                    processedBlocks: 0,
                    errors: 0,
                    cacheHits: 0
                };

                // Configuration
                this.config = {
                    autoInitialize: true,
                    enabledFeatures: {
                        highlighting: true,
                        diagrams: true,
                        copyButtons: true,
                        errorRecovery: true,
                        performance: true
                    },
                    processing: {
                        batchSize: 5,
                        maxConcurrency: 3,
                        timeout: 30000
                    },
                    compatibility: {
                        legacyApi: true,
                        wordpressBlocks: true,
                        classicEditor: true
                    }
                };

                // Auto initialization
                if (this.config.autoInitialize) {
                    this.scheduleInitialization();
                }
            }

            // =============================================
            // Initialization System
            // =============================================

            /**
             * Schedule initialization
             */
            scheduleInitialization() {
                if (global.document) {
                    if (global.document.readyState === 'loading') {
                        global.document.addEventListener('DOMContentLoaded', () => this.initialize());
                    } else {
                        setTimeout(() => this.initialize(), 0);
                    }
                }
            }

            /**
             * Main initialization process
             */
            async initialize() {
                if (this.initialized || this.initializationPromise) {
                    return this.initializationPromise || Promise.resolve();
                }

                const startTime = performance.now();

                this.initializationPromise = this.doInitialize();

                try {
                    await this.initializationPromise;
                    this.performanceStats.initTime = performance.now() - startTime;
                    this.initialized = true;

                    this.debug(`WP GFM Core initialized in ${this.performanceStats.initTime.toFixed(2)}ms`);

                    // Initialization complete event
                    if (global.document) {
                        global.document.dispatchEvent(new CustomEvent('wpGfmCoreReady', {
                            detail: {
                                core: this,
                                initTime: this.performanceStats.initTime
                            }
                        }));
                    }

                    // Start auto processing
                    this.startAutoProcessing();

                    return this;
                } catch (error) {
                    console.error('[WP GFM Core] Initialization failed:', error);
                    throw error;
                }
            }

            /**
             * Actual initialization process
             */
            async doInitialize() {
                // 1. Load core modules
                await this.loadCoreModules();

                // 2. Merge settings
                this.integrateConfigurations();

                // 3. Initialize editor integration
                if (this.config.compatibility.wordpressBlocks || this.config.compatibility.classicEditor) {
                    this.initializeEditorIntegration();
                }

                // 4. Provide legacy API
                if (this.config.compatibility.legacyApi) {
                    this.provideLegacyApi();
                }

                // 5. Start performance monitoring
                if (this.config.enabledFeatures.performance) {
                    this.startPerformanceMonitoring();
                }

                // 6. Initialize theme settings
                this.initializeThemeSettings();

                // 7. Initialize Shiki for admin screen
                if (this.isAdminPreview()) {
                    await this.initializeAdminShiki();
                }

                this.debug('Core initialization completed');
            }

            /**
             * Load core modules
             */
            async loadCoreModules() {
                const moduleChecks = {
                    utils: () => global.wpGfmUtils,
                    assets: () => global.wpGfmAssets,
                    highlighter: () => global.wpGfmHighlighter,
                    diagrams: () => global.wpGfmDiagrams,
                    ui: () => global.wpGfmUI
                };

                // Wait for and load modules
                for (const moduleName of this.moduleLoadOrder) {
                    await this.waitForModule(moduleName, moduleChecks[moduleName]);
                }

                // Set module references
                this.utils = global.wpGfmUtils;
                this.assets = global.wpGfmAssets;
                this.highlighter = global.wpGfmHighlighter;
                this.diagrams = global.wpGfmDiagrams;
                this.ui = global.wpGfmUI;

                this.debug('All core modules loaded');
            }

            /**
             * Wait for module
             */
            async waitForModule(name, checkFunction, timeout = 15000) {
                const startTime = Date.now();

                // Special handling for admin screen context
                if (this.isAdminPreview()) {
                    timeout = 20000; // Longer timeout for admin screen
                }

                // Assets module may take longer to load
                if (name === 'assets' || name === 'ui') {
                    timeout = Math.max(timeout, 20000);
                    this.debug(`🔧 Critical module ${name}: Extended timeout (${timeout}ms)`);
                }

                let lastLogTime = startTime;
                while (!checkFunction() && (Date.now() - startTime) < timeout) {
                    await this.delay(100);

                    // Progress log (every 5 seconds)
                    const elapsed = Date.now() - startTime;
                    if (elapsed - (lastLogTime - startTime) >= 5000) {
                        this.debug(`⏳ Still waiting for module ${name}... (${elapsed}ms elapsed)`);
                        lastLogTime = Date.now();
                    }
                }

                if (!checkFunction()) {
                    // Provide detailed error information
                    const availableModules = Object.keys(global).filter(key => key.startsWith('wpGfm'));
                    const errorDetails = {
                        module: name,
                        timeout: timeout,
                        availableModules: availableModules,
                        isAdmin: this.isAdminPreview(),
                        globalCheck: name === 'utils' ? typeof global.wpGfmUtils : 'N/A',
                        documentReady: document.readyState,
                        scriptsLoaded: this.getLoadedScripts()
                    };

                    console.warn(`[WP GFM Core] Module ${name} loading timeout - attempting graceful degradation`);
                    this.debug('❌ Module loading failed - details:', errorDetails);

                    // For non-critical modules, just warn and continue
                    if (this.isNonCriticalModule(name)) {
                        console.warn(`[WP GFM Core] Non-critical module ${name} failed to load - continuing with degraded functionality`);
                        this.modules.set(name, null); // Mark with null value
                        return;
                    }

                    throw new Error(`Critical module ${name} failed to load within timeout (${timeout}ms)`);
                }

                this.modules.set(name, checkFunction());
                this.debug(`✅ Module ${name} loaded successfully`);
            }

            /**
             * Merge settings
             */
            integrateConfigurations() {
                if (!this.utils) return;

                // Load WordPress settings
                const wpConfig = global.wpGfmConfig || {};

                // Feature enable/disable control
                this.config.enabledFeatures = {
                    ...this.config.enabledFeatures,
                    ...wpConfig.features
                };

                // Merge processing settings
                this.config.processing = {
                    ...this.config.processing,
                    ...wpConfig.processing
                };

                this.utils.debug('Configurations integrated', this.config);
            }

            /**
             * Initialize theme settings
             */
            initializeThemeSettings() {
                if (!global.document || !global.wpGfmConfig) return;

                const themeSettings = global.wpGfmConfig.theme;
                if (!themeSettings) return;

                const body = global.document.body;
                if (!body) return;

                try {
                    // Initialize system theme detection
                    this.setupSystemThemeDetection();

                    // Set data-gfmr-theme attribute based on current theme settings
                    let themeAttribute = 'light'; // Default

                    if (themeSettings.system_auto) {
                        themeAttribute = 'auto';
                        // Set actual color scheme based on system theme with additional class
                        this.applySystemTheme();
                    } else if (themeSettings.current === 'dark') {
                        themeAttribute = 'dark';
                    } else if (themeSettings.current === 'light') {
                        themeAttribute = 'light';
                    }

                    body.setAttribute('data-gfmr-theme', themeAttribute);

                    // Set listener for theme change events
                    global.document.addEventListener('wpGfmThemeChanged', (event) => {
                        this.handleThemeChange(event.detail);
                    });

                    this.debug(`Theme initialized: ${themeAttribute}`);

                } catch (error) {
                    this.debug('Failed to initialize theme settings', error);
                }
            }

            /**
             * Setup system theme detection
             */
            setupSystemThemeDetection() {
                if (!global.window || !global.window.matchMedia) {
                    this.debug('matchMedia not supported - system theme detection disabled');
                    return;
                }

                try {
                    // Setup prefers-color-scheme media query
                    const darkThemeQuery = global.window.matchMedia('(prefers-color-scheme: dark)');

                    // Detect initial system theme
                    const systemPrefersDark = darkThemeQuery.matches;
                    this.debug(`System theme detected: ${systemPrefersDark ? 'dark' : 'light'}`);

                    // Set listener for system theme changes
                    const handleSystemThemeChange = (e) => {
                        this.debug(`System theme changed: ${e.matches ? 'dark' : 'light'}`);

                        // Only update if current setting is system_auto
                        const themeSettings = global.wpGfmConfig && global.wpGfmConfig.theme;
                        if (themeSettings && themeSettings.system_auto) {
                            this.applySystemTheme();

                            // Fire custom event to notify modules like Shiki
                            const event = new CustomEvent('wpGfmSystemThemeChanged', {
                                detail: {
                                    prefersDark: e.matches,
                                    newTheme: e.matches ? 'github-dark' : 'github-light'
                                }
                            });
                            global.document.dispatchEvent(event);
                        }
                    };

                    // Modern browser support
                    if (darkThemeQuery.addEventListener) {
                        darkThemeQuery.addEventListener('change', handleSystemThemeChange);
                    }
                    // Legacy browser support
                    else if (darkThemeQuery.addListener) {
                        darkThemeQuery.addListener(handleSystemThemeChange);
                    }

                    this.debug('System theme detection initialized');

                } catch (error) {
                    this.debug('Failed to setup system theme detection', error);
                }
            }

            /**
             * Apply system theme
             */
            applySystemTheme() {
                if (!global.window || !global.window.matchMedia || !global.document) return;

                try {
                    const darkThemeQuery = global.window.matchMedia('(prefers-color-scheme: dark)');
                    const systemPrefersDark = darkThemeQuery.matches;
                    const body = global.document.body;

                    if (body) {
                        // Add/remove class corresponding to system theme
                        body.classList.remove('gfmr-system-light', 'gfmr-system-dark');
                        body.classList.add(systemPrefersDark ? 'gfmr-system-dark' : 'gfmr-system-light');

                        // Smooth transition effect
                        body.classList.add('gfmr-theme-transitioning');
                        setTimeout(() => {
                            body.classList.remove('gfmr-theme-transitioning');
                        }, 300);

                        this.debug(`Applied system theme: ${systemPrefersDark ? 'dark' : 'light'}`);
                    }

                } catch (error) {
                    this.debug('Failed to apply system theme', error);
                }
            }

            /**
             * Theme change handler
             */
            handleThemeChange(detail) {
                if (!global.document) return;

                const body = global.document.body;
                if (!body) return;

                try {
                    const { newTheme } = detail;
                    let themeAttribute = 'light';

                    if (newTheme === 'github-dark') {
                        themeAttribute = 'dark';
                    } else if (newTheme === 'github-light') {
                        themeAttribute = 'light';
                    } else if (newTheme === 'auto') {
                        themeAttribute = 'auto';
                    }

                    body.setAttribute('data-gfmr-theme', themeAttribute);
                    body.classList.add('gfmr-theme-switching');

                    // Remove class after animation completes
                    setTimeout(() => {
                        body.classList.remove('gfmr-theme-switching');
                    }, 400);

                    this.debug(`Theme changed to: ${themeAttribute}`);

                } catch (error) {
                    this.debug('Failed to handle theme change', error);
                }
            }

            // =============================================
            // Content Processing Engine
            // =============================================

            /**
             * Main content processing function
             */
            async processContent(content, options = {}) {
                if (!this.initialized) {
                    await this.initialize();
                }

                try {
                    const startTime = performance.now();

                    // Preprocess content
                    const preprocessed = this.preprocessContent(content, options);

                    // Extract metadata
                    const metadata = this.extractContentMetadata(preprocessed, options);

                    // Processing result
                    const result = {
                        original: content,
                        processed: preprocessed,
                        metadata: metadata,
                        blocks: [],
                        timing: {}
                    };

                    // Process code blocks
                    if (this.config.enabledFeatures.highlighting) {
                        const codeBlocks = this.findCodeBlocks(preprocessed);
                        result.blocks.push(...await this.processCodeBlocks(codeBlocks, options));
                    }

                    // Process diagrams
                    if (this.config.enabledFeatures.diagrams) {
                        const diagramBlocks = this.findDiagramBlocks(preprocessed);
                        result.blocks.push(...await this.processDiagramBlocks(diagramBlocks, options));
                    }

                    // Add UI components
                    if (this.config.enabledFeatures.copyButtons && this.ui) {
                        this.ui.addCopyButtonsToAllCodeBlocks();
                    }

                    result.timing.total = performance.now() - startTime;
                    this.performanceStats.processedBlocks += result.blocks.length;

                    return result;

                } catch (error) {
                    this.performanceStats.errors++;
                    this.handleError(error, 'content_processing', { content, options });
                    throw error;
                }
            }

            /**
             * Preprocess content
             */
            preprocessContent(content, options = {}) {
                if (!content || typeof content !== 'string') {
                    return '';
                }

                let processed = content;

                // WordPress-specific preprocessing
                if (options.isWordPressContent) {
                    // Process block comments
                    processed = this.processWordPressBlocks(processed);

                    // Preprocess shortcodes
                    processed = this.preprocessShortcodes(processed);
                }

                // Protect metadata markers
                processed = this.protectMetadataMarkers(processed);

                return processed;
            }

            /**
             * Process code blocks
             */
            async processCodeBlocks(codeBlocks, options = {}) {
                if (!this.highlighter || codeBlocks.length === 0) {
                    return [];
                }

                const results = [];
                const batchSize = this.config.processing.batchSize;

                // Batch processing
                for (let i = 0; i < codeBlocks.length; i += batchSize) {
                    const batch = codeBlocks.slice(i, i + batchSize);
                    const batchResults = await Promise.all(
                        batch.map(async (block, index) => {
                            try {
                                return await this.processSingleCodeBlock(block, i + index, options);
                            } catch (error) {
                                this.handleError(error, 'code_block_processing', { block, index: i + index });
                                return { success: false, error: error.message, index: i + index };
                            }
                        })
                    );

                    results.push(...batchResults);

                    // Brief pause between batches
                    if (i + batchSize < codeBlocks.length) {
                        await this.delay(10);
                    }
                }

                return results;
            }

            /**
             * Process single code block
             */
            async processSingleCodeBlock(block, index, options = {}) {
                const codeText = block.textContent || '';
                const language = this.detectLanguage(block, options);

                // Attempt to restore metadata
                const metadata = this.restoreBlockMetadata(codeText, block);
                const finalLanguage = metadata?.language || language;

                // Highlight processing
                const highlighted = await this.highlighter.highlight(codeText, finalLanguage, {
                    context: options.context || 'core-processing',
                    metadata: metadata,
                    blockIndex: index
                });

                if (highlighted && highlighted !== codeText) {
                    // DOM update
                    this.updateBlockInDOM(block, highlighted, index);
                    return { success: true, language: finalLanguage, index, highlighted: true };
                }

                return { success: true, language: finalLanguage, index, highlighted: false };
            }

            /**
             * Process diagram blocks
             */
            async processDiagramBlocks(diagramBlocks, options = {}) {
                if (!this.diagrams || diagramBlocks.length === 0) {
                    return [];
                }

                const results = [];

                for (const [index, block] of diagramBlocks.entries()) {
                    try {
                        const content = block.textContent || '';
                        await this.diagrams.renderDiagram(content, block, {
                            context: options.context || 'core-processing',
                            blockIndex: index
                        });

                        results.push({ success: true, type: 'diagram', index });
                    } catch (error) {
                        this.handleError(error, 'diagram_processing', { block, index });
                        results.push({ success: false, error: error.message, index });
                    }
                }

                return results;
            }

            // =============================================
            // Metadata Management System
            // =============================================

            /**
             * Extract content metadata
             */
            extractContentMetadata(content, options = {}) {
                const metadata = {
                    timestamp: Date.now(),
                    contentLength: content.length,
                    contentHash: this.generateContentHash(content),
                    context: options.context || 'unknown',
                    blocks: []
                };

                // WordPress-specific metadata
                if (options.isWordPressContent) {
                    metadata.wordpress = this.extractWordPressMetadata(content);
                }

                // Block-level metadata
                metadata.blocks = this.extractBlockMetadata(content);

                this.contentMetadata.set(metadata.contentHash, metadata);
                return metadata;
            }

            /**
             * Restore block metadata
             */
            restoreBlockMetadata(codeText, element) {
                // Search by content hash
                const contentHash = this.generateContentHash(codeText);
                const cached = this.blockMetadata.get(contentHash);

                if (cached) {
                    this.performanceStats.cacheHits++;
                    return cached;
                }

                // Restore from DOM attributes
                let current = element;
                while (current && current !== document.body) {
                    if (current.getAttribute && current.getAttribute('data-gfmr-meta')) {
                        try {
                            const metadata = JSON.parse(current.getAttribute('data-gfmr-meta'));
                            this.blockMetadata.set(contentHash, metadata);
                            return metadata;
                        } catch (error) {
                            this.debug('Failed to parse metadata attribute:', error);
                        }
                    }
                    current = current.parentElement;
                }

                return null;
            }

            /**
             * Generate content hash
             */
            generateContentHash(content) {
                // Simple hash function
                let hash = 0;
                for (let i = 0; i < content.length; i++) {
                    const char = content.charCodeAt(i);
                    hash = ((hash << 5) - hash) + char;
                    hash = hash & hash; // Convert to 32-bit integer
                }
                return hash.toString(36);
            }

            // =============================================
            // Editor Integration System
            // =============================================

            /**
             * Initialize editor integration
             */
            initializeEditorIntegration() {
                // Gutenberg block editor support
                if (global.wp && global.wp.blocks) {
                    this.initializeGutenbergIntegration();
                }

                // Classic editor support
                if (global.tinyMCE) {
                    this.initializeClassicEditorIntegration();
                }

                // Other editor support
                this.initializeGenericEditorIntegration();

                this.editorIntegration.enabled = true;
                this.debug('Editor integration initialized');
            }

            /**
             * Gutenberg editor integration
             */
            initializeGutenbergIntegration() {
                // Hook for block insertion
                if (global.wp.data && global.wp.data.subscribe) {
                    let previousBlockCount = 0;

                    global.wp.data.subscribe(() => {
                        const blocks = global.wp.data.select('core/block-editor')?.getBlocks() || [];

                        if (blocks.length > previousBlockCount) {
                            // New block has been added
                            setTimeout(() => this.processNewContent(), 100);
                        }

                        previousBlockCount = blocks.length;
                    });
                }
            }

            /**
             * Classic editor integration
             */
            initializeClassicEditorIntegration() {
                // Monitor TinyMCE changes
                if (global.tinyMCE) {
                    global.tinyMCE.on('AddEditor', (e) => {
                        const editor = e.editor;
                        editor.on('NodeChange SetContent', () => {
                            setTimeout(() => this.processNewContent(), 200);
                        });
                    });
                }
            }

            /**
             * Generic editor integration
             */
            initializeGenericEditorIntegration() {
                // Generic monitoring using MutationObserver
                const observer = new MutationObserver((mutations) => {
                    let shouldProcess = false;

                    mutations.forEach(mutation => {
                        if (mutation.type === 'childList') {
                            mutation.addedNodes.forEach(node => {
                                if (node.nodeType === Node.ELEMENT_NODE) {
                                    const hasCode = node.querySelector('code, pre') ||
                                                  node.matches('code, pre');
                                    if (hasCode) {
                                        shouldProcess = true;
                                    }
                                }
                            });
                        }
                    });

                    if (shouldProcess) {
                        setTimeout(() => this.processNewContent(), 100);
                    }
                });

                observer.observe(document.body, {
                    childList: true,
                    subtree: true
                });

                this.editorIntegration.observers.set('generic', observer);
            }

            // =============================================
            // Auto Processing System
            // =============================================

            /**
             * Start auto processing
             */
            startAutoProcessing() {
                // Process initial content
                this.processExistingContent();

                // Periodic detection of new content
                setInterval(() => {
                    this.processNewContent();
                }, 2000);

                this.debug('Auto processing started');
            }

            /**
             * Process existing content
             */
            async processExistingContent() {
                const codeBlocks = this.findAllCodeBlocks();
                const diagramBlocks = this.findAllDiagramBlocks();

                this.debug(`Processing ${codeBlocks.length} code blocks and ${diagramBlocks.length} diagrams`);

                // Batch processing
                const codeResults = await this.processCodeBlocks(codeBlocks, { context: 'initial-load' });
                const diagramResults = await this.processDiagramBlocks(diagramBlocks, { context: 'initial-load' });

                this.debug(`Processed ${codeResults.length + diagramResults.length} blocks total`);
            }

            /**
             * Process new content
             */
            async processNewContent() {
                if (this.isProcessing) return;

                this.isProcessing = true;

                try {
                    const unprocessedCode = this.findUnprocessedCodeBlocks();
                    const unprocessedDiagrams = this.findUnprocessedDiagramBlocks();

                    if (unprocessedCode.length > 0 || unprocessedDiagrams.length > 0) {
                        this.debug(`Processing ${unprocessedCode.length} new code blocks and ${unprocessedDiagrams.length} new diagrams`);

                        await Promise.all([
                            this.processCodeBlocks(unprocessedCode, { context: 'dynamic-load' }),
                            this.processDiagramBlocks(unprocessedDiagrams, { context: 'dynamic-load' })
                        ]);
                    }
                } catch (error) {
                    this.handleError(error, 'auto_processing');
                } finally {
                    this.isProcessing = false;
                }
            }

            // =============================================
            // Block Detection System
            // =============================================

            /**
             * Detect all code blocks
             */
            findAllCodeBlocks() {
                const selectors = [
                    'pre code',
                    '.wp-block-code code',
                    'code[class*="language-"]',
                    '.highlight code'
                ];

                return Array.from(document.querySelectorAll(selectors.join(', ')));
            }

            /**
             * Detect unprocessed code blocks
             */
            findUnprocessedCodeBlocks() {
                const allBlocks = this.findAllCodeBlocks();
                return allBlocks.filter(block => !this.processedContent.has(block));
            }

            /**
             * Detect all diagram blocks
             */
            findAllDiagramBlocks() {
                const selectors = [
                    'code[class*="mermaid"]',
                    'pre code[class*="mermaid"]',
                    '.language-mermaid'
                ];

                return Array.from(document.querySelectorAll(selectors.join(', ')));
            }

            /**
             * Detect unprocessed diagram blocks
             */
            findUnprocessedDiagramBlocks() {
                const allBlocks = this.findAllDiagramBlocks();
                return allBlocks.filter(block => !this.processedContent.has(block));
            }

            /**
             * Detect code blocks from content
             */
            findCodeBlocks(_content) { // eslint-disable-line no-unused-vars
                // This implementation is string parsing based and returns actual DOM elements
                // For simplicity, uses existing DOM detection method
                return this.findAllCodeBlocks();
            }

            /**
             * Detect diagram blocks from content
             */
            findDiagramBlocks(_content) { // eslint-disable-line no-unused-vars
                return this.findAllDiagramBlocks();
            }

            // =============================================
            // Legacy API Provision
            // =============================================

            /**
             * Provide legacy API
             */
            provideLegacyApi() {
                // Main rendering function
                global.wpGfmRenderer = {
                    processCodeBlocks: (blocks) => this.processCodeBlocks(blocks || this.findAllCodeBlocks()),
                    renderContent: (content, options) => this.processContent(content, options),
                    initialize: () => this.initialize()
                };

                // Individual feature API
                global.wpGfmHighlight = (code, language, options) => {
                    return this.highlighter ? this.highlighter.highlight(code, language, options) : null;
                };

                global.wpGfmRenderDiagram = (content, element, options) => {
                    return this.diagrams ? this.diagrams.renderDiagram(content, element, options) : null;
                };

                // Unified processing API
                global.wpGfmUnifiedHighlight = (code, language, options) => {
                    return this.processUnifiedHighlight(code, language, options);
                };

                this.debug('Legacy API provided');
            }

            /**
             * Unified highlight processing (legacy compatible)
             */
            async processUnifiedHighlight(code, language, options = {}) {
                if (!this.initialized) {
                    await this.initialize();
                }

                if (!this.highlighter) {
                    return code; // Fallback
                }

                return await this.highlighter.highlight(code, language, {
                    ...options,
                    context: 'legacy-api'
                });
            }

            // =============================================
            // Utilities
            // =============================================

            /**
             * Language detection
             */
            detectLanguage(element, _options = {}) { // eslint-disable-line no-unused-vars
                // Detect from class name
                const className = element.className || '';
                const match = className.match(/language-(\w+)/);
                if (match) return match[1];

                // Detect from data attribute
                if (element.dataset && element.dataset.language) {
                    return element.dataset.language;
                }

                // Detect from parent element
                const parent = element.closest('pre, div');
                if (parent && parent.className) {
                    const parentMatch = parent.className.match(/language-(\w+)/);
                    if (parentMatch) return parentMatch[1];
                }

                return 'plaintext';
            }

            /**
             * Update DOM block
             */
            updateBlockInDOM(block, highlightedContent, index) {
                try {
                    const tempDiv = document.createElement('div');
                    tempDiv.innerHTML = highlightedContent;

                    const newPre = tempDiv.querySelector('pre');
                    if (newPre && block.parentElement) {
                        const container = block.closest('pre') || block.parentElement;
                        if (container.parentNode) {
                            container.parentNode.replaceChild(newPre, container);
                            this.processedContent.add(newPre.querySelector('code') || newPre);
                        }
                    }
                } catch (error) {
                    this.handleError(error, 'dom_update', { block, index });
                }
            }

            /**
             * Process WordPress blocks
             */
            processWordPressBlocks(content) {
                // Process WordPress block comments
                return content.replace(/<!-- wp:[\s\S]*? -->/g, '');
            }

            /**
             * Preprocess shortcodes
             */
            preprocessShortcodes(content) {
                // Basic shortcode protection
                return content.replace(/\[([^\]]+)\]/g, '{{SHORTCODE:$1}}');
            }

            /**
             * Protect metadata markers
             */
            protectMetadataMarkers(content) {
                return content.replace(/<!--\s*gfmr-meta:[\s\S]*?-->/g, (match) => {
                    return `{{META:${btoa(match)}}}`;
                });
            }

            /**
             * Extract WordPress metadata
             */
            extractWordPressMetadata(content) {
                const metadata = {};

                // Extract block information
                const blockMatches = content.match(/<!-- wp:(\w+\/\w+).*?-->/g);
                if (blockMatches) {
                    metadata.blocks = blockMatches.map(match => {
                        const blockType = match.match(/wp:(\w+\/\w+)/);
                        return blockType ? blockType[1] : 'unknown';
                    });
                }

                return metadata;
            }

            /**
             * Extract block metadata
             */
            extractBlockMetadata(content) {
                const blocks = [];

                // Code block pattern
                const codeBlockRegex = /```(\w+)?\s*\n([\s\S]*?)```/g;
                let match;

                while ((match = codeBlockRegex.exec(content)) !== null) {
                    blocks.push({
                        type: 'code',
                        language: match[1] || 'plaintext',
                        content: match[2],
                        position: match.index
                    });
                }

                // Mermaid block pattern
                const mermaidRegex = /```mermaid\s*\n([\s\S]*?)```/g;
                while ((match = mermaidRegex.exec(content)) !== null) {
                    blocks.push({
                        type: 'diagram',
                        diagramType: 'mermaid',
                        content: match[1],
                        position: match.index
                    });
                }

                return blocks;
            }

            /**
             * Error handling
             */
            handleError(error, context, details = {}) {
                if (this.utils) {
                    this.utils.handleError(error, context, details);
                } else {
                    console.error(`[WP GFM Core] Error in ${context}:`, error, details);
                }
            }

            /**
             * Debug output
             */
            debug(message, ...args) {
                if (this.utils) {
                    this.utils.debug(message, ...args);
                } else if (global.wpGfmDebug) {
                    console.log(`[WP GFM Core] ${message}`, ...args);
                }
            }

            /**
             * Delay processing
             */
            delay(ms) {
                return new Promise(resolve => setTimeout(resolve, ms));
            }

            /**
             * Start performance monitoring
             */
            startPerformanceMonitoring() {
                if (!this.utils) return;

                // Periodic statistics collection
                setInterval(() => {
                    this.collectPerformanceStats();
                }, 30000); // 30 second interval
            }

            /**
             * Collect performance statistics
             */
            collectPerformanceStats() {
                const stats = {
                    core: this.getStats(),
                    modules: {}
                };

                if (this.utils) stats.modules.utils = this.utils.getStats();
                if (this.highlighter) stats.modules.highlighter = this.highlighter.getStats();
                if (this.diagrams) stats.modules.diagrams = this.diagrams.getStats();
                if (this.assets) stats.modules.assets = this.assets.getStats();
                if (this.ui) stats.modules.ui = this.ui.getStats();

                this.debug('Performance stats collected', stats);
                return stats;
            }

            // =============================================
            // External API
            // =============================================

            /**
             * Manually process content
             */
            async render(content, options = {}) {
                return await this.processContent(content, options);
            }

            /**
             * Highlight specific code block
             */
            async highlight(code, language = 'plaintext', options = {}) {
                if (!this.initialized) await this.initialize();
                return this.highlighter ? await this.highlighter.highlight(code, language, options) : code;
            }

            /**
             * Render diagram
             */
            async renderDiagram(content, element, options = {}) {
                if (!this.initialized) await this.initialize();
                return this.diagrams ? await this.diagrams.renderDiagram(content, element, options) : null;
            }

            /**
             * Reprocess all content
             */
            async reprocessAll() {
                this.processedContent = new WeakSet();
                this.contentMetadata.clear();
                this.blockMetadata.clear();

                await this.processExistingContent();
            }

            /**
             * Health check
             */
            healthCheck() {
                return {
                    status: this.initialized ? 'ok' : 'initializing',
                    initialized: this.initialized,
                    modules: {
                        utils: !!this.utils,
                        highlighter: !!this.highlighter,
                        diagrams: !!this.diagrams,
                        assets: !!this.assets,
                        ui: !!this.ui
                    },
                    editorIntegration: this.editorIntegration.enabled,
                    performance: this.performanceStats,
                    config: this.config
                };
            }

            /**
             * Get statistics
             */
            getStats() {
                return {
                    initialized: this.initialized,
                    initTime: this.performanceStats.initTime,
                    processedBlocks: this.performanceStats.processedBlocks,
                    errors: this.performanceStats.errors,
                    cacheHits: this.performanceStats.cacheHits,
                    contentMetadata: this.contentMetadata.size,
                    blockMetadata: this.blockMetadata.size,
                    modulesLoaded: this.modules.size,
                    healthCheck: this.healthCheck()
                };
            }

            // =============================================
            // Admin Screen Support
            // =============================================

            /**
             * Determine if this is an admin page
             */
            isAdminPage() {
                return global.wpGfmConfig && global.wpGfmConfig.isAdmin;
            }

            /**
             * Determine if this is an admin preview
             */
            isAdminPreview() {
                return global.wpGfmConfig && global.wpGfmConfig.adminPreview;
            }

            /**
             * Initialize Shiki for admin screen
             */
            async initializeAdminShiki() {
                if (!this.isAdminPreview()) return;

                try {
                    this.debug('🔧 GFMR Admin: Initializing Shiki for admin preview...');

                    // Dynamically import Shiki
                    const { createHighlighter } = await import('https://esm.sh/shiki@1.0.0');

                    // Create highlighter with both themes
                    global.gfmrAdminHighlighter = await createHighlighter({
                        themes: ['github-light', 'github-dark'],
                        langs: ['javascript', 'typescript', 'python', 'php', 'html', 'css', 'rust']
                    });

                    this.debug('✅ GFMR Admin: Shiki highlighter initialized');

                    // Processing when jQuery is ready
                    if (global.jQuery) {
                        global.jQuery(global.document).ready(() => {
                            this.setupAdminJQueryIntegration();
                        });
                    }

                } catch (error) {
                    this.debug('❌ GFMR Admin: Error initializing Shiki', error);
                }
            }

            /**
             * Setup admin jQuery integration
             */
            setupAdminJQueryIntegration() {
                if (!global.jQuery || !this.isAdminPreview()) return;

                const $ = global.jQuery;

                // Monitor preview code element
                const $previewCode = $('#gfmr-preview-code');
                if ($previewCode.length) {
                    this.debug('✅ GFMR Admin: Found preview code element, ready for highlighting');

                    // Apply initial highlighting
                    this.applyAdminPreviewHighlighting($previewCode);
                }
            }

            /**
             * Apply admin preview highlighting
             */
            async applyAdminPreviewHighlighting($element) {
                if (!global.gfmrAdminHighlighter || !$element.length) return;

                try {
                    const code = $element.text();
                    const themeSettings = global.wpGfmConfig && global.wpGfmConfig.theme;
                    const currentTheme = this.getEffectiveAdminTheme(themeSettings);

                    const html = global.gfmrAdminHighlighter.codeToHtml(code, {
                        lang: 'javascript',
                        theme: currentTheme
                    });

                    $element.parent().html(html);
                    this.debug(`✅ GFMR Admin: Applied highlighting with theme: ${currentTheme}`);

                } catch (error) {
                    this.debug('❌ GFMR Admin: Error applying preview highlighting', error);
                }
            }

            /**
             * Get effective admin theme
             */
            getEffectiveAdminTheme(themeSettings) {
                if (!themeSettings) return 'github-light';

                if (themeSettings.current === 'system') {
                    const prefersDark = global.window.matchMedia &&
                                       global.window.matchMedia('(prefers-color-scheme: dark)').matches;
                    return prefersDark ? 'github-dark' : 'github-light';
                }

                return themeSettings.shiki_theme || 'github-light';
            }

            /**
             * Determine if module is non-critical
             */
            isNonCriticalModule(moduleName) {
                const nonCritical = ['diagrams', 'highlighter'];
                return nonCritical.includes(moduleName);
            }

            /**
             * Get loaded scripts
             */
            getLoadedScripts() {
                const scripts = Array.from(document.querySelectorAll('script[src]'));
                return scripts
                    .filter(script => script.src.includes('gfmr-') || script.src.includes('wp-gfm'))
                    .map(script => ({
                        src: script.src.split('/').pop(),
                        loaded: script.readyState === 'complete' || script.readyState === 'loaded'
                    }));
            }
        }

        // Create and expose global instance
        const wpGfmCore = new WPGFMCore();

        // Expose as global variables
        global.wpGfmCore = wpGfmCore;
        global.WPGFMCore = WPGFMCore;

        // Main entry point
        global.wpGfm = wpGfmCore;

        // CommonJS / AMD support
        if (typeof module !== 'undefined' && module.exports) {
            module.exports = WPGFMCore;
        }

    })(typeof window !== 'undefined' ? window : global);