/**
 * Mercedes-Benz MYP Platform - Zentrale Event Handler
 * CSP-konforme Event-Handler ohne Inline-JavaScript
 */

class GlobalEventManager {
    constructor() {
        this.init();
    }

    init() {
        // Event-Delegation für bessere Performance und CSP-Konformität
        document.addEventListener('click', this.handleClick.bind(this));
        document.addEventListener('DOMContentLoaded', this.setupEventListeners.bind(this));
        
        // Falls DOM bereits geladen
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', this.setupEventListeners.bind(this));
        } else {
            this.setupEventListeners();
        }
    }

    /**
     * Zentrale Click-Handler mit Event-Delegation
     */
    handleClick(event) {
        const target = event.target.closest('[data-action]');
        if (!target) return;

        const action = target.getAttribute('data-action');
        const params = this.parseActionParams(target);

        event.preventDefault();
        this.executeAction(action, params, target);
    }

    /**
     * Action-Parameter aus data-Attributen parsen
     */
    parseActionParams(element) {
        const params = {};
        
        // Alle data-action-* Attribute sammeln
        for (const attr of element.attributes) {
            if (attr.name.startsWith('data-action-')) {
                const key = attr.name.replace('data-action-', '');
                params[key] = attr.value;
            }
        }

        return params;
    }

    /**
     * Action ausführen basierend auf dem Action-Namen
     */
    executeAction(action, params, element) {
        console.log(`🎯 Führe Action aus: ${action}`, params);

        switch (action) {
            // Dashboard Actions
            case 'refresh-dashboard':
                if (typeof refreshDashboard === 'function') refreshDashboard();
                break;

            // Navigation Actions
            case 'logout':
                if (typeof handleLogout === 'function') handleLogout();
                break;

            case 'go-back':
                window.history.back();
                break;

            case 'reload-page':
                window.location.reload();
                break;

            case 'print-page':
                window.print();
                break;

            // Job Management Actions
            case 'refresh-jobs':
                if (typeof refreshJobs === 'function') refreshJobs();
                break;

            case 'toggle-batch-mode':
                if (typeof toggleBatchMode === 'function') toggleBatchMode();
                break;

            case 'start-job':
                if (typeof jobManager !== 'undefined' && params.id) {
                    jobManager.startJob(params.id);
                }
                break;

            case 'pause-job':
                if (typeof jobManager !== 'undefined' && params.id) {
                    jobManager.pauseJob(params.id);
                }
                break;

            case 'resume-job':
                if (typeof jobManager !== 'undefined' && params.id) {
                    jobManager.resumeJob(params.id);
                }
                break;

            case 'delete-job':
                if (typeof jobManager !== 'undefined' && params.id) {
                    jobManager.deleteJob(params.id);
                }
                break;

            case 'open-job-details':
                if (typeof jobManager !== 'undefined' && params.id) {
                    jobManager.openJobDetails(params.id);
                }
                break;

            // Printer Management Actions
            case 'refresh-printers':
                if (typeof refreshPrinters === 'function') refreshPrinters();
                break;

            case 'toggle-maintenance-mode':
                if (typeof toggleMaintenanceMode === 'function') toggleMaintenanceMode();
                break;

            case 'open-add-printer-modal':
                if (typeof openAddPrinterModal === 'function') openAddPrinterModal();
                break;

            case 'toggle-auto-refresh':
                if (typeof toggleAutoRefresh === 'function') toggleAutoRefresh();
                break;

            case 'clear-all-filters':
                if (typeof clearAllFilters === 'function') clearAllFilters();
                break;

            case 'test-printer-connection':
                if (typeof testPrinterConnection === 'function') testPrinterConnection();
                break;

            case 'delete-printer':
                if (typeof deletePrinter === 'function') deletePrinter();
                break;

            case 'edit-printer':
                if (typeof printerManager !== 'undefined' && params.id) {
                    printerManager.editPrinter(params.id);
                }
                break;

            case 'connect-printer':
                if (typeof printerManager !== 'undefined' && params.id) {
                    printerManager.connectPrinter(params.id);
                }
                break;

            // Calendar Actions
            case 'refresh-calendar':
                if (typeof refreshCalendar === 'function') refreshCalendar();
                break;

            case 'toggle-auto-optimization':
                if (typeof toggleAutoOptimization === 'function') toggleAutoOptimization();
                break;

            case 'export-calendar':
                if (typeof exportCalendar === 'function') exportCalendar();
                break;

            case 'open-create-event-modal':
                if (typeof openCreateEventModal === 'function') openCreateEventModal();
                break;

            // Modal Actions
            case 'close-modal':
                this.closeModal(params.target || element.closest('.fixed'));
                break;

            case 'close-printer-modal':
                if (typeof closePrinterModal === 'function') closePrinterModal();
                break;

            case 'close-job-modal':
                if (typeof closeJobModal === 'function') closeJobModal();
                break;

            case 'close-event-modal':
                if (typeof closeEventModal === 'function') closeEventModal();
                break;

            // Form Actions
            case 'reset-form':
                if (typeof resetForm === 'function') resetForm();
                else this.resetNearestForm(element);
                break;

            case 'clear-file':
                if (typeof clearFile === 'function') clearFile();
                break;

            // Guest Request Actions
            case 'check-status':
                if (typeof checkStatus === 'function') checkStatus();
                break;

            case 'copy-code':
                if (typeof copyCode === 'function') copyCode();
                break;

            case 'refresh-status':
                if (typeof refreshStatus === 'function') refreshStatus();
                break;

            case 'show-status-check':
                if (typeof showStatusCheck === 'function') showStatusCheck();
                break;

            // Admin Actions
            case 'perform-bulk-action':
                if (typeof performBulkAction === 'function' && params.type) {
                    performBulkAction(params.type);
                }
                break;

            case 'close-bulk-modal':
                if (typeof closeBulkModal === 'function') closeBulkModal();
                break;

            case 'clear-cache':
                if (typeof clearCache === 'function') clearCache();
                break;

            case 'optimize-database':
                if (typeof optimizeDatabase === 'function') optimizeDatabase();
                break;

            case 'create-backup':
                if (typeof createBackup === 'function') createBackup();
                break;

            case 'download-logs':
                if (typeof downloadLogs === 'function') downloadLogs();
                break;

            case 'run-maintenance':
                if (typeof runMaintenance === 'function') runMaintenance();
                break;

            case 'save-settings':
                if (typeof saveSettings === 'function') saveSettings();
                break;

            // Profile Actions
            case 'toggle-edit-mode':
                if (typeof toggleEditMode === 'function') toggleEditMode();
                break;

            case 'trigger-avatar-upload':
                if (typeof triggerAvatarUpload === 'function') triggerAvatarUpload();
                break;

            case 'cancel-edit':
                if (typeof cancelEdit === 'function') cancelEdit();
                break;

            case 'download-user-data':
                if (typeof downloadUserData === 'function') downloadUserData();
                break;

            // Stats Actions
            case 'refresh-stats':
                if (typeof refreshStats === 'function') refreshStats();
                break;

            case 'export-stats':
                if (typeof exportStats === 'function') exportStats();
                break;

            // Generic Actions
            case 'remove-element':
                const targetElement = params.target ? 
                    document.querySelector(params.target) : 
                    element.closest(params.selector || '.removable');
                if (targetElement) {
                    targetElement.remove();
                }
                break;

            case 'toggle-element':
                const toggleTarget = params.target ? 
                    document.querySelector(params.target) : 
                    element.nextElementSibling;
                if (toggleTarget) {
                    toggleTarget.classList.toggle('hidden');
                }
                break;

            case 'show-element':
                const showTarget = document.querySelector(params.target);
                if (showTarget) {
                    showTarget.classList.remove('hidden');
                }
                break;

            case 'hide-element':
                const hideTarget = document.querySelector(params.target);
                if (hideTarget) {
                    hideTarget.classList.add('hidden');
                }
                break;

            default:
                console.warn(`⚠️ Unbekannte Action: ${action}`);
                // Versuche globale Funktion zu finden
                if (typeof window[action] === 'function') {
                    window[action](params);
                }
                break;
        }
    }

    /**
     * Generische Modal-Schließfunktion
     */
    closeModal(modalElement) {
        if (modalElement) {
            modalElement.classList.add('hidden');
            modalElement.remove();
        }
    }

    /**
     * Nächstes Formular zurücksetzen
     */
    resetNearestForm(element) {
        const form = element.closest('form');
        if (form) {
            form.reset();
        }
    }

    /**
     * Spezifische Event-Listener einrichten
     */
    setupEventListeners() {
        // Auto-Refresh für bestimmte Seiten
        this.setupAutoRefresh();
        
        // Keyboard Shortcuts
        this.setupKeyboardShortcuts();
        
        // Form Validierung
        this.setupFormValidation();

        console.log('🔧 Globale Event-Handler initialisiert');
    }

    /**
     * Auto-Refresh für Dashboard/Jobs einrichten
     */
    setupAutoRefresh() {
        const currentPath = window.location.pathname;
        
        // Auto-refresh für Dashboard alle 30 Sekunden
        if (currentPath.includes('/dashboard')) {
            setInterval(() => {
                if (typeof refreshDashboard === 'function') {
                    refreshDashboard();
                }
            }, 30000);
        }
        
        // Auto-refresh für Jobs alle 15 Sekunden
        if (currentPath.includes('/jobs')) {
            setInterval(() => {
                if (typeof refreshJobs === 'function') {
                    refreshJobs();
                }
            }, 15000);
        }
    }

    /**
     * Keyboard Shortcuts einrichten
     */
    setupKeyboardShortcuts() {
        document.addEventListener('keydown', (event) => {
            // ESC zum Schließen von Modals
            if (event.key === 'Escape') {
                const openModal = document.querySelector('.fixed:not(.hidden)');
                if (openModal) {
                    this.closeModal(openModal);
                }
            }
            
            // Ctrl+R für Refresh (überschreiben für spezifische Funktionen)
            if (event.ctrlKey && event.key === 'r') {
                event.preventDefault();
                const currentPath = window.location.pathname;
                
                if (currentPath.includes('/dashboard') && typeof refreshDashboard === 'function') {
                    refreshDashboard();
                } else if (currentPath.includes('/jobs') && typeof refreshJobs === 'function') {
                    refreshJobs();
                } else if (currentPath.includes('/printers') && typeof refreshPrinters === 'function') {
                    refreshPrinters();
                } else {
                    window.location.reload();
                }
            }
        });
    }

    /**
     * Form-Validierung einrichten
     */
    setupFormValidation() {
        // Alle Formulare finden und Validierung hinzufügen
        const forms = document.querySelectorAll('form[data-validate]');
        forms.forEach(form => {
            form.addEventListener('submit', this.validateForm.bind(this));
        });
    }

    /**
     * Formular validieren
     */
    validateForm(event) {
        const form = event.target;
        const requiredFields = form.querySelectorAll('[required]');
        let isValid = true;

        requiredFields.forEach(field => {
            if (!field.value.trim()) {
                isValid = false;
                field.classList.add('border-red-500');
                
                // Fehlermeldung anzeigen
                const errorId = `${field.id}-error`;
                let errorElement = document.getElementById(errorId);
                
                if (!errorElement) {
                    errorElement = document.createElement('div');
                    errorElement.id = errorId;
                    errorElement.className = 'text-red-500 text-sm mt-1';
                    field.parentNode.appendChild(errorElement);
                }
                
                errorElement.textContent = `${field.getAttribute('data-label') || 'Dieses Feld'} ist erforderlich.`;
            } else {
                field.classList.remove('border-red-500');
                const errorElement = document.getElementById(`${field.id}-error`);
                if (errorElement) {
                    errorElement.remove();
                }
            }
        });

        if (!isValid) {
            event.preventDefault();
        }

        return isValid;
    }
}

// Globale Instanz erstellen
const globalEventManager = new GlobalEventManager();

// Export für Module
if (typeof module !== 'undefined' && module.exports) {
    module.exports = GlobalEventManager;
}

console.log('🌍 Globaler Event Manager geladen');