/**
 * Benachrichtigungssystem für die MYP 3D-Druck Platform
 * Verwaltet die Anzeige und Interaktion mit Benachrichtigungen
 */

class NotificationManager {
    constructor() {
        this.notificationToggle = document.getElementById('notificationToggle');
        this.notificationDropdown = document.getElementById('notificationDropdown');
        this.notificationBadge = document.getElementById('notificationBadge');
        this.notificationList = document.getElementById('notificationList');
        this.markAllReadBtn = document.getElementById('markAllRead');
        
        this.isOpen = false;
        this.notifications = [];
        
        // CSRF-Token aus Meta-Tag holen
        this.csrfToken = this.getCSRFToken();
        
        this.init();
    }
    
    /**
     * Holt das CSRF-Token aus dem Meta-Tag
     * @returns {string} Das CSRF-Token
     */
    getCSRFToken() {
        const metaTag = document.querySelector('meta[name="csrf-token"]');
        return metaTag ? metaTag.getAttribute('content') : '';
    }
    
    /**
     * Erstellt die Standard-Headers für API-Anfragen mit CSRF-Token
     * @returns {Object} Headers-Objekt
     */
    getAPIHeaders() {
        const headers = {
            'Content-Type': 'application/json',
        };
        
        if (this.csrfToken) {
            headers['X-CSRFToken'] = this.csrfToken;
        }
        
        return headers;
    }
    
    init() {
        if (!this.notificationToggle) return;
        
        // Event Listeners
        this.notificationToggle.addEventListener('click', (e) => {
            e.stopPropagation();
            this.toggleDropdown();
        });
        
        if (this.markAllReadBtn) {
            this.markAllReadBtn.addEventListener('click', () => {
                this.markAllAsRead();
            });
        }
        
        // Dropdown schließen bei Klick außerhalb
        document.addEventListener('click', (e) => {
            if (!this.notificationDropdown.contains(e.target) && !this.notificationToggle.contains(e.target)) {
                this.closeDropdown();
            }
        });
        
        // Benachrichtigungen laden
        this.loadNotifications();
        
        // Regelmäßige Updates
        setInterval(() => {
            this.loadNotifications();
        }, 30000); // Alle 30 Sekunden
    }
    
    toggleDropdown() {
        if (this.isOpen) {
            this.closeDropdown();
        } else {
            this.openDropdown();
        }
    }
    
    openDropdown() {
        this.notificationDropdown.classList.remove('hidden');
        this.notificationToggle.setAttribute('aria-expanded', 'true');
        this.isOpen = true;
        
        // Animation
        this.notificationDropdown.style.opacity = '0';
        this.notificationDropdown.style.transform = 'translateY(-10px)';
        
        requestAnimationFrame(() => {
            this.notificationDropdown.style.transition = 'opacity 0.2s ease, transform 0.2s ease';
            this.notificationDropdown.style.opacity = '1';
            this.notificationDropdown.style.transform = 'translateY(0)';
        });
    }
    
    closeDropdown() {
        this.notificationDropdown.style.transition = 'opacity 0.2s ease, transform 0.2s ease';
        this.notificationDropdown.style.opacity = '0';
        this.notificationDropdown.style.transform = 'translateY(-10px)';
        
        setTimeout(() => {
            this.notificationDropdown.classList.add('hidden');
            this.notificationToggle.setAttribute('aria-expanded', 'false');
            this.isOpen = false;
        }, 200);
    }
    
    async loadNotifications() {
        try {
            const response = await fetch('/api/notifications');
            if (response.ok) {
                const data = await response.json();
                this.notifications = data.notifications || [];
                this.updateUI();
            }
        } catch (error) {
            console.error('Fehler beim Laden der Benachrichtigungen:', error);
        }
    }
    
    updateUI() {
        this.updateBadge();
        this.updateNotificationList();
    }
    
    updateBadge() {
        const unreadCount = this.notifications.filter(n => !n.read).length;
        
        if (unreadCount > 0) {
            this.notificationBadge.textContent = unreadCount > 99 ? '99+' : unreadCount.toString();
            this.notificationBadge.classList.remove('hidden');
        } else {
            this.notificationBadge.classList.add('hidden');
        }
    }
    
    updateNotificationList() {
        if (this.notifications.length === 0) {
            this.notificationList.innerHTML = `
                <div class="p-4 text-center text-slate-500 dark:text-slate-400">
                    Keine neuen Benachrichtigungen
                </div>
            `;
            return;
        }
        
        const notificationHTML = this.notifications.map(notification => {
            const isUnread = !notification.read;
            const timeAgo = this.formatTimeAgo(new Date(notification.created_at));
            
            return `
                <div class="notification-item p-4 border-b border-slate-200 dark:border-slate-600 hover:bg-slate-50 dark:hover:bg-slate-700 transition-colors ${isUnread ? 'bg-blue-50 dark:bg-blue-900/20' : ''}" 
                     data-notification-id="${notification.id}">
                    <div class="flex items-start space-x-3">
                        <div class="flex-shrink-0">
                            ${this.getNotificationIcon(notification.type)}
                        </div>
                        <div class="flex-1 min-w-0">
                            <div class="flex items-center justify-between">
                                <p class="text-sm font-medium text-slate-900 dark:text-white">
                                    ${this.getNotificationTitle(notification.type)}
                                </p>
                                ${isUnread ? '<div class="w-2 h-2 bg-blue-500 rounded-full"></div>' : ''}
                            </div>
                            <p class="text-sm text-slate-600 dark:text-slate-400 mt-1">
                                ${this.getNotificationMessage(notification)}
                            </p>
                            <p class="text-xs text-slate-500 dark:text-slate-500 mt-2">
                                ${timeAgo}
                            </p>
                        </div>
                    </div>
                </div>
            `;
        }).join('');
        
        this.notificationList.innerHTML = notificationHTML;
        
        // Event Listeners für Benachrichtigungen
        this.notificationList.querySelectorAll('.notification-item').forEach(item => {
            item.addEventListener('click', (e) => {
                const notificationId = item.dataset.notificationId;
                this.markAsRead(notificationId);
            });
        });
    }
    
    getNotificationIcon(type) {
        const icons = {
            'guest_request': `
                <div class="w-8 h-8 bg-blue-100 dark:bg-blue-900 rounded-full flex items-center justify-center">
                    <svg class="w-4 h-4 text-blue-600 dark:text-blue-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z"/>
                    </svg>
                </div>
            `,
            'job_completed': `
                <div class="w-8 h-8 bg-green-100 dark:bg-green-900 rounded-full flex items-center justify-center">
                    <svg class="w-4 h-4 text-green-600 dark:text-green-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"/>
                    </svg>
                </div>
            `,
            'system': `
                <div class="w-8 h-8 bg-gray-100 dark:bg-gray-900 rounded-full flex items-center justify-center">
                    <svg class="w-4 h-4 text-gray-600 dark:text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
                    </svg>
                </div>
            `
        };
        
        return icons[type] || icons['system'];
    }
    
    getNotificationTitle(type) {
        const titles = {
            'guest_request': 'Neue Gastanfrage',
            'job_completed': 'Druckauftrag abgeschlossen',
            'system': 'System-Benachrichtigung'
        };
        
        return titles[type] || 'Benachrichtigung';
    }
    
    getNotificationMessage(notification) {
        try {
            const payload = JSON.parse(notification.payload || '{}');
            
            switch (notification.type) {
                case 'guest_request':
                    return `${payload.guest_name || 'Ein Gast'} hat eine neue Druckanfrage gestellt.`;
                case 'job_completed':
                    return `Der Druckauftrag "${payload.job_name || 'Unbekannt'}" wurde erfolgreich abgeschlossen.`;
                default:
                    return payload.message || 'Neue Benachrichtigung erhalten.';
            }
        } catch (error) {
            return 'Neue Benachrichtigung erhalten.';
        }
    }
    
    formatTimeAgo(date) {
        const now = new Date();
        const diffInSeconds = Math.floor((now - date) / 1000);
        
        if (diffInSeconds < 60) {
            return 'Gerade eben';
        } else if (diffInSeconds < 3600) {
            const minutes = Math.floor(diffInSeconds / 60);
            return `vor ${minutes} Minute${minutes !== 1 ? 'n' : ''}`;
        } else if (diffInSeconds < 86400) {
            const hours = Math.floor(diffInSeconds / 3600);
            return `vor ${hours} Stunde${hours !== 1 ? 'n' : ''}`;
        } else {
            const days = Math.floor(diffInSeconds / 86400);
            return `vor ${days} Tag${days !== 1 ? 'en' : ''}`;
        }
    }
    
    async markAsRead(notificationId) {
        try {
            const response = await fetch(`/api/notifications/${notificationId}/read`, {
                method: 'POST',
                headers: this.getAPIHeaders()
            });
            
            if (response.ok) {
                // Benachrichtigung als gelesen markieren
                const notification = this.notifications.find(n => n.id == notificationId);
                if (notification) {
                    notification.read = true;
                    this.updateUI();
                }
            } else {
                console.error('Fehler beim Markieren als gelesen:', response.status, response.statusText);
            }
        } catch (error) {
            console.error('Fehler beim Markieren als gelesen:', error);
        }
    }
    
    async markAllAsRead() {
        try {
            const response = await fetch('/api/notifications/mark-all-read', {
                method: 'POST',
                headers: this.getAPIHeaders()
            });
            
            if (response.ok) {
                // Alle Benachrichtigungen als gelesen markieren
                this.notifications.forEach(notification => {
                    notification.read = true;
                });
                this.updateUI();
            } else {
                console.error('Fehler beim Markieren aller als gelesen:', response.status, response.statusText);
            }
        } catch (error) {
            console.error('Fehler beim Markieren aller als gelesen:', error);
        }
    }
}

// Initialisierung nach DOM-Load
document.addEventListener('DOMContentLoaded', () => {
    new NotificationManager();
});