/**
 * Main Markitect JavaScript Entry Point
 * Initializes all controls and systems when document is ready
 * Implements graceful degradation for missing dependencies
 * Supports Fail Fast strict mode for development
 */

// Development mode detection
const MARKITECT_STRICT_MODE = (
    window.location.hostname === 'localhost' ||
    window.location.hostname === '127.0.0.1' ||
    window.location.search.includes('strict=true') ||
    window.markitectStrictMode === true
);

// Utility functions for safe initialization
const MarkitectMain = {
    // Safe dependency checking with timeout
    checkDependencies: function() {
        const dependencies = {
            debugSystem: !!window.MarkitectDebugSystem,
            control: !!window.Control,
            statusControl: !!window.StatusControl,
            debugControl: !!window.DebugControl,
            contentsControl: !!window.ContentsControl,
            editControl: !!window.EditControl
        };

        console.log('📋 Dependency check results:', dependencies);
        return dependencies;
    },

    // Safe logging that works even without debug system
    safeLog: function(message, level = 'INFO', component = 'Main', data = {}) {
        console.log(`[${level}] ${component}: ${message}`);

        // In strict mode, throw on errors for immediate development feedback
        if (MARKITECT_STRICT_MODE && level === 'ERROR') {
            console.error(`🚨 STRICT MODE: Throwing error for immediate diagnosis`);
            throw new Error(`${component}: ${message}`);
        }

        // Try to use debug system if available
        if (window.MarkitectDebugSystem && window.MarkitectDebugSystem.addMessage) {
            try {
                window.MarkitectDebugSystem.addMessage(message, level, component, { ...data, eventType: 'SYSTEM' });
            } catch (error) {
                console.warn('Debug system logging failed:', error);
                if (MARKITECT_STRICT_MODE) {
                    throw error; // Fail fast in development
                }
            }
        }
    },

    // Safe control initialization with fallbacks
    initializeControl: function(controlClass, controlName, icon = '🔧') {
        const timeout = setTimeout(() => {
            const message = `${controlName} initialization timed out`;
            console.warn(message);
            if (MARKITECT_STRICT_MODE) {
                throw new Error(message); // Fail fast in development
            }
        }, 5000);

        try {
            if (!controlClass) {
                const message = `${controlName} class not available, skipping`;
                this.safeLog(message, MARKITECT_STRICT_MODE ? 'ERROR' : 'WARNING');
                clearTimeout(timeout);
                return null;
            }

            const controlInstance = new controlClass();
            if (!controlInstance || typeof controlInstance.createControl !== 'function') {
                throw new Error(`Invalid ${controlName} instance`);
            }

            const element = controlInstance.createControl();
            if (!element) {
                throw new Error(`${controlName} failed to create element`);
            }

            clearTimeout(timeout);
            this.safeLog(`${controlName} initialized successfully`, 'SUCCESS');
            return controlInstance;

        } catch (error) {
            clearTimeout(timeout);
            this.safeLog(`${controlName} initialization failed: ${error.message}`, 'ERROR');

            // Create minimal fallback control if core Control class exists
            if (window.Control && controlName === 'StatusControl') {
                return this.createFallbackControl(controlName, icon);
            }

            return null;
        }
    },

    // Create minimal fallback control for essential controls
    createFallbackControl: function(name, icon) {
        try {
            const fallback = Object.create(window.Control);
            fallback.config = {
                icon: icon,
                title: `${name} (Fallback)`,
                className: `${name.toLowerCase()}-fallback`,
                defaultContent: `${name} is running in fallback mode due to initialization issues.`,
                ariaLabel: `${name} Fallback Control`,
                position: 'e'
            };

            const element = fallback.createControl();
            if (element) {
                this.safeLog(`${name} fallback control created`, 'INFO');
                return { control: fallback };
            }
        } catch (error) {
            this.safeLog(`Fallback control creation failed: ${error.message}`, 'ERROR');
        }
        return null;
    },

    // Main initialization with comprehensive error handling
    initialize: function() {
        this.safeLog('🚀 Initializing Markitect controls and systems...', 'INFO');

        // Check dependencies first
        const deps = this.checkDependencies();

        if (!deps.control) {
            this.safeLog('❌ Core Control system not available, cannot initialize UI controls', 'ERROR');
            return;
        }

        const initializedControls = {};
        let successCount = 0;
        let totalAttempts = 0;

        // Initialize controls with graceful degradation
        const controlsToInit = [
            { class: window.StatusControl, name: 'StatusControl', key: 'statusControl', icon: '📊', essential: true },
            { class: window.DebugControl, name: 'DebugControl', key: 'debugControl', icon: '🪲', essential: false },
            { class: window.ContentsControl, name: 'ContentsControl', key: 'contentsControl', icon: '☰', essential: false },
            { class: window.EditControl, name: 'EditControl', key: 'editControl', icon: '✏️', essential: false }
        ];

        controlsToInit.forEach(({ class: controlClass, name, key, icon, essential }) => {
            totalAttempts++;
            const instance = this.initializeControl(controlClass, name, icon);

            if (instance) {
                initializedControls[key] = instance.control || instance;
                window[key] = initializedControls[key];
                successCount++;
            } else if (essential) {
                this.safeLog(`Essential control ${name} failed to initialize`, 'ERROR');
            }
        });

        // Report initialization results
        const successRate = Math.round((successCount / totalAttempts) * 100);
        if (successCount === totalAttempts) {
            this.safeLog('✅ All controls initialized successfully', 'SUCCESS');
        } else if (successCount > 0) {
            this.safeLog(`⚠️ Partial initialization: ${successCount}/${totalAttempts} controls (${successRate}%) initialized`, 'WARNING');
        } else {
            this.safeLog('❌ No controls could be initialized', 'ERROR');
        }

        // Set up global error handlers for runtime protection
        this.setupErrorHandlers();

        this.safeLog(`✅ Markitect initialization complete (${successCount}/${totalAttempts} controls active)`, 'INFO');
    },

    // Set up global error handlers
    setupErrorHandlers: function() {
        // Catch unhandled errors
        window.addEventListener('error', (event) => {
            this.safeLog(`Unhandled error: ${event.message} at ${event.filename}:${event.lineno}`, 'ERROR');
        });

        // Catch unhandled promise rejections
        window.addEventListener('unhandledrejection', (event) => {
            this.safeLog(`Unhandled promise rejection: ${event.reason}`, 'ERROR');
            event.preventDefault(); // Prevent console spam
        });
    }
};

// Initialize when DOM is ready with additional safety
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => {
        setTimeout(() => MarkitectMain.initialize(), 100); // Brief delay for dependencies
    });
} else {
    // DOM already loaded
    setTimeout(() => MarkitectMain.initialize(), 100);
}