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

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     /**
     * GFMR Utils - Unified Foundation Module
     *
     * Unified utility, configuration, debug, and error handling foundation
     * Provides common functionality as the base for all GFMR modules
     *
     * Consolidated 6 files into 1:
     * - gfmr-utils.js
     * - gfmr-config-accessor.js
     * - gfmr-debug-config.js
     * - gfmr-debug-helper.js
     * - markdown-config.js
     * - error-handler.js
     *
     * @package WpGfmRenderer
     * @since 2.0.0
     */

    (function(global) {
        'use strict';

        /**
         * WP GFM Utils - Unified Utility Class
         */
        class WPGFMUtils {
            constructor() {
                // Configuration management
                this.config = new Map();
                this.defaultConfig = new Map();

                // Debug functionality
                this.debugMode = false;
                this.debugLevel = 'info'; // 'debug', 'info', 'warn', 'error'
                this.debugOutput = [];

                // Error handling
                this.errorHandlers = [];
                this.errorHistory = [];
                this.maxErrorHistory = 100;

                // Performance measurement
                this.metrics = new Map();
                this.timers = new Map();

                // Initialization
                this.initializeConfig();
                this.initializeDebugMode();
                this.setupGlobalErrorHandling();
            }

            // =============================================
            // Configuration Management System
            // =============================================

            /**
             * Initialize configuration
             */
            initializeConfig() {
                // Get WordPress configuration
                const wpConfig = global.wpGfmConfig || {};
                const markdownConfig = global.wpGfmMarkdownConfig || {};

                // Default configuration
                this.setDefaultConfig({
                    // Debug settings
                    'debug.enabled': false,
                    'debug.level': 'info',
                    'debug.console': true,
                    'debug.storage': false,

                    // Performance settings
                    'performance.tracking': true,
                    'performance.maxMetrics': 1000,

                    // Error handling settings
                    'error.reporting': true,
                    'error.maxHistory': 100,
                    'error.autoRecovery': true,

                    // Internationalization settings
                    'i18n.locale': 'en',
                    'i18n.fallback': 'en',

                    // Highlight settings
                    'highlight.theme': 'github-light',
                    'highlight.languages': ['javascript', 'python', 'php', 'html', 'css'],

                    // Mermaid settings
                    'mermaid.theme': 'default',
                    'mermaid.maxWidth': 1200,

                    // UI settings
                    'ui.copyButton': true,
                    'ui.accessibility': true,

                    // Merged settings (retrieved from WordPress)
                    ...wpConfig,
                    ...markdownConfig
                });

                this.debug('Configuration initialized', {
                    wpConfig: Object.keys(wpConfig).length,
                    markdownConfig: Object.keys(markdownConfig).length
                });
            }

            /**
             * Set default configuration
             */
            setDefaultConfig(defaults) {
                Object.entries(defaults).forEach(([key, value]) => {
                    this.defaultConfig.set(key, value);
                    if (!this.config.has(key)) {
                        this.config.set(key, value);
                    }
                });
            }

            /**
             * Get configuration value
             */
            getConfig(key, defaultValue = null) {
                if (this.config.has(key)) {
                    return this.config.get(key);
                }

                if (this.defaultConfig.has(key)) {
                    return this.defaultConfig.get(key);
                }

                // Get nested configuration using dot notation
                if (key.includes('.')) {
                    const value = this.getNestedConfig(key);
                    if (value !== undefined) {
                        return value;
                    }
                }

                return defaultValue;
            }

            /**
             * Get nested configuration (dot notation support)
             */
            getNestedConfig(key) {
                const keys = key.split('.');
                let current = global.wpGfmConfig || {};

                for (const k of keys) {
                    if (current && typeof current === 'object' && k in current) {
                        current = current[k];
                    } else {
                        return undefined;
                    }
                }

                return current;
            }

            /**
             * Set configuration value
             */
            setConfig(key, value) {
                this.config.set(key, value);
                this.debug(`Config set: ${key} = ${value}`);
            }

            // =============================================
            // Debug System
            // =============================================

            /**
             * Initialize debug mode
             */
            initializeDebugMode() {
                // Check URL parameter
                const urlDebug = global.location && global.location.search.includes('debug=true');

                // Check WordPress configuration
                const wpDebug = this.getConfig('debug.enabled', false);

                // Check global variable
                const globalDebug = global.wpGfmDebug === true;

                // Determine debug mode
                this.debugMode = urlDebug || wpDebug || globalDebug;
                this.debugLevel = this.getConfig('debug.level', 'info');

                if (this.debugMode) {
                    this.debug('Debug mode activated', {
                        source: urlDebug ? 'URL' : wpDebug ? 'Config' : 'Global',
                        level: this.debugLevel
                    });
                }
            }

            /**
             * Debug output
             */
            debug(message, data = null, level = 'info') {
                if (!this.debugMode) return;

                const logEntry = {
                    timestamp: new Date().toISOString(),
                    level: level,
                    message: message,
                    data: data,
                    stack: this.getConfig('debug.includeStack', false) ? new Error().stack : null
                };

                // Console output
                if (this.getConfig('debug.console', true)) {
                    const prefix = '[WP GFM Utils]';
                    switch (level) {
                        case 'error':
                            console.error(prefix, message, data);
                            break;
                        case 'warn':
                            console.warn(prefix, message, data);
                            break;
                        case 'info':
                            console.log(prefix, message, data);
                            break;
                        case 'debug':
                            console.debug(prefix, message, data);
                            break;
                    }
                }

                // Storage save
                if (this.getConfig('debug.storage', false)) {
                    this.debugOutput.push(logEntry);

                    // Maximum storage limit
                    const maxEntries = this.getConfig('debug.maxEntries', 1000);
                    if (this.debugOutput.length > maxEntries) {
                        this.debugOutput = this.debugOutput.slice(-maxEntries);
                    }
                }
            }

            /**
             * Get debug information
             */
            getDebugInfo() {
                return {
                    enabled: this.debugMode,
                    level: this.debugLevel,
                    entries: this.debugOutput.length,
                    config: Object.fromEntries(this.config),
                    errors: this.errorHistory.length,
                    metrics: Object.fromEntries(this.metrics)
                };
            }

            // =============================================
            // Error Handling System
            // =============================================

            /**
             * Setup global error handling
             */
            setupGlobalErrorHandling() {
                if (!this.getConfig('error.reporting', true)) return;

                // Capture JavaScript errors
                const originalErrorHandler = global.onerror;
                global.onerror = (message, source, lineno, colno, error) => {
                    this.handleError({
                        type: 'javascript',
                        message: message,
                        source: source,
                        line: lineno,
                        column: colno,
                        error: error
                    });

                    if (originalErrorHandler) {
                        return originalErrorHandler.call(global, message, source, lineno, colno, error);
                    }
                    return false;
                };

                // Capture Promise rejections
                global.addEventListener('unhandledrejection', (event) => {
                    this.handleError({
                        type: 'promise',
                        message: 'Unhandled Promise Rejection',
                        error: event.reason
                    });
                });
            }

            /**
             * Register error handler
             */
            addErrorHandler(handler, priority = 10) {
                this.errorHandlers.push({ handler, priority });
                this.errorHandlers.sort((a, b) => a.priority - b.priority);
            }

            /**
             * Handle error
             */
            handleError(error, context = null) {
                const errorEntry = {
                    timestamp: new Date().toISOString(),
                    error: error,
                    context: context,
                    id: this.generateErrorId()
                };

                // Add to error history
                this.errorHistory.push(errorEntry);
                if (this.errorHistory.length > this.maxErrorHistory) {
                    this.errorHistory = this.errorHistory.slice(-this.maxErrorHistory);
                }

                // Debug output
                this.debug('Error occurred', errorEntry, 'error');

                // Execute registered handlers
                this.errorHandlers.forEach(({ handler }) => {
                    try {
                        handler(errorEntry);
                    } catch (handlerError) {
                        console.error('[WP GFM Utils] Error in error handler:', handlerError);
                    }
                });

                // Attempt auto recovery
                if (this.getConfig('error.autoRecovery', true)) {
                    this.attemptAutoRecovery(errorEntry);
                }

                return errorEntry.id;
            }

            /**
             * Generate error ID
             */
            generateErrorId() {
                return 'wpgfm_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
            }

            /**
             * Attempt auto recovery
             */
            attemptAutoRecovery(errorEntry) {
                // Basic recovery strategy
                const error = errorEntry.error;

                if (error && error.message) {
                    // Recovery for Shiki-related errors
                    if (error.message.includes('shiki') || error.message.includes('highlight')) {
                        this.debug('Attempting Shiki recovery');
                        // Execute emergency fix script if available
                        if (global.wpGfmEmergencyHighlightFix) {
                            setTimeout(() => global.wpGfmEmergencyHighlightFix(), 100);
                        }
                    }

                    // Recovery for Mermaid-related errors
                    if (error.message.includes('mermaid')) {
                        this.debug('Attempting Mermaid recovery');
                        // Re-initialize Mermaid, etc.
                    }
                }
            }

            // =============================================
            // Performance Measurement
            // =============================================

            /**
             * Start timer
             */
            startTimer(name) {
                this.timers.set(name, performance.now());
            }

            /**
             * End timer and get measured value
             */
            endTimer(name) {
                const startTime = this.timers.get(name);
                if (!startTime) {
                    this.debug(`Timer ${name} not found`, null, 'warn');
                    return null;
                }

                const elapsed = performance.now() - startTime;
                this.timers.delete(name);

                // Record in metrics
                this.recordMetric(name, elapsed);

                return elapsed;
            }

            /**
             * Record metric
             */
            recordMetric(name, value, unit = 'ms') {
                if (!this.getConfig('performance.tracking', true)) return;

                const metric = {
                    value: value,
                    unit: unit,
                    timestamp: Date.now()
                };

                // Add to existing metrics
                if (!this.metrics.has(name)) {
                    this.metrics.set(name, []);
                }

                const metrics = this.metrics.get(name);
                metrics.push(metric);

                // Maximum storage limit
                const maxMetrics = this.getConfig('performance.maxMetrics', 1000);
                if (metrics.length > maxMetrics) {
                    metrics.splice(0, metrics.length - maxMetrics);
                }
            }

            /**
             * Get metric statistics
             */
            getMetricStats(name) {
                const metrics = this.metrics.get(name);
                if (!metrics || metrics.length === 0) {
                    return null;
                }

                const values = metrics.map(m => m.value);
                const sum = values.reduce((a, b) => a + b, 0);

                return {
                    count: values.length,
                    sum: sum,
                    average: sum / values.length,
                    min: Math.min(...values),
                    max: Math.max(...values),
                    latest: values[values.length - 1]
                };
            }

            // =============================================
            // General Utilities
            // =============================================

            /**
             * Deep clone object
             */
            deepClone(obj) {
                if (obj === null || typeof obj !== 'object') return obj;
                if (obj instanceof Date) return new Date(obj);
                if (obj instanceof Array) return obj.map(item => this.deepClone(item));
                if (typeof obj === 'object') {
                    const cloned = {};
                    Object.keys(obj).forEach(key => {
                        cloned[key] = this.deepClone(obj[key]);
                    });
                    return cloned;
                }
            }

            /**
             * Safe merge objects
             */
            mergeObjects(...objects) {
                const result = {};
                objects.forEach(obj => {
                    if (obj && typeof obj === 'object') {
                        Object.keys(obj).forEach(key => {
                            result[key] = obj[key];
                        });
                    }
                });
                return result;
            }

            /**
             * Sanitize string
             */
            sanitizeString(str) {
                if (typeof str !== 'string') return '';
                return str
                    .replace(/[<>]/g, '') // Remove HTML tags
                    .replace(/javascript:/gi, '') // Remove JavaScript URLs
                    .trim();
            }

            /**
             * Delayed function execution (debounce)
             */
            debounce(func, wait, immediate = false) {
                let timeout;
                return function executedFunction(...args) {
                    const later = () => {
                        timeout = null;
                        if (!immediate) func.apply(this, args);
                    };
                    const callNow = immediate && !timeout;
                    clearTimeout(timeout);
                    timeout = setTimeout(later, wait);
                    if (callNow) func.apply(this, args);
                };
            }

            /**
             * Limit function execution frequency (throttle)
             */
            throttle(func, limit) {
                let inThrottle;
                return function(...args) {
                    if (!inThrottle) {
                        func.apply(this, args);
                        inThrottle = true;
                        setTimeout(() => inThrottle = false, limit);
                    }
                };
            }

            /**
             * Asset URL builder helper function
             * Build local asset URLs compliant with WordPress.org distribution
             *
             * @param {string} path - Relative path (e.g., 'assets/libs/shiki/shiki.min.js')
             * @returns {string} - Complete URL
             */
            buildAssetUrl(path) {
                const baseUrl = global.wpGfmConfig?.pluginUrl || '/wp-content/plugins/markdown-renderer-for-github/';
                // Normalize trailing slash from base URL
                const normalizedBase = baseUrl.replace(/\/+$/, '');
                // Normalize leading slash from path
                const normalizedPath = path.replace(/^\/+/, '');
                return `${normalizedBase}/${normalizedPath}`;
            }

            // =============================================
            // External API (Global Exposure)
            // =============================================

            /**
             * Module initialization complete
             */
            initialize() {
                // Final initialization process
                this.debug('WP GFM Utils initialized', this.getDebugInfo());

                // Initialization complete event
                if (global.document) {
                    global.document.dispatchEvent(new CustomEvent('wpGfmUtilsReady', {
                        detail: { utils: this }
                    }));
                }

                return this;
            }

            /**
             * Health check
             */
            healthCheck() {
                return {
                    status: 'ok',
                    version: '2.0.0',
                    initialized: true,
                    debugMode: this.debugMode,
                    configLoaded: this.config.size > 0,
                    errorsCount: this.errorHistory.length,
                    metricsCount: this.metrics.size
                };
            }

            /**
             * Get statistics
             */
            getStats() {
                return {
                    initialized: this.initialized,
                    debugMode: this.debugMode,
                    configEntries: this.config.size,
                    errorCount: this.errorHandlers.length,
                    metricsCount: this.metrics.size,
                    timestamp: Date.now()
                };
            }
        }

        // Create and expose global instance
        const wpGfmUtils = new WPGFMUtils();

        // Expose as global variable
        global.wpGfmUtils = wpGfmUtils;
        global.WPGFMUtils = WPGFMUtils; // Also expose class (for testing)

        // Legacy API for backward compatibility
        global.wpGfmIsDebugMode = () => wpGfmUtils.debugMode;
        global.wpGfmGetConfig = (key, defaultValue) => wpGfmUtils.getConfig(key, defaultValue);
        global.wpGfmDebugLog = (message, data) => wpGfmUtils.debug(message, data);

        // Unified Error Handler API
        // Provides consistent error/warning logging across all GFMR modules
        global.wpGfmErrorHandler = {
            /**
             * Handle an error with context and details
             *
             * @param {Error|string} error - The error object or message
             * @param {string} context - Module or function context (e.g., 'Shiki', 'Mermaid')
             * @param {Object} details - Additional details for debugging
             */
            handle: function(error, context, details) {
                const errorMessage = error instanceof Error ? error.message : String(error);
                const errorStack = error instanceof Error ? error.stack : null;

                console.error('[GFMR Error]', {
                    context: context || 'Unknown',
                    message: errorMessage,
                    details: details || null,
                    stack: errorStack
                });

                // Also record in wpGfmUtils error history if available
                if (wpGfmUtils && typeof wpGfmUtils.handleError === 'function') {
                    wpGfmUtils.handleError({
                        type: 'gfmr',
                        message: errorMessage,
                        source: context,
                        error: error
                    }, details);
                }
            },

            /**
             * Log a warning message with context
             *
             * @param {string} message - The warning message
             * @param {string} context - Module or function context
             * @param {Object} details - Additional details for debugging
             */
            warn: function(message, context, details) {
                console.warn('[GFMR Warn][' + (context || 'Unknown') + ']', message, details || '');

                // Also record in debug log if available
                if (wpGfmUtils && typeof wpGfmUtils.debug === 'function') {
                    wpGfmUtils.debug(message, details, 'warn');
                }
            },

            /**
             * Log an info message with context (for non-critical issues)
             *
             * @param {string} message - The info message
             * @param {string} context - Module or function context
             */
            info: function(message, context) {
                if (wpGfmUtils && wpGfmUtils.debugMode) {
                    console.info('[GFMR Info][' + (context || 'Unknown') + ']', message);
                }
            }
        };

        // Execute initialization
        if (global.document && global.document.readyState === 'loading') {
            global.document.addEventListener('DOMContentLoaded', () => wpGfmUtils.initialize());
        } else {
            // If DOM is already loaded
            setTimeout(() => wpGfmUtils.initialize(), 0);
        }

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

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