class NotificationLog extends HTMLElement {
    constructor() {
        super();
        this.attachShadow({ mode: 'open' });
        this.notifications = [];
        this.filteredNotifications = [];
        this.isLoading = false;
        this.channelFilter = 'all';
        this.statusFilter = 'all';
    }

    static get observedAttributes() {
        return ['loading', 'channel-filter', 'status-filter'];
    }

    connectedCallback() {
        this.loadNotifications();
    }

    async loadNotifications() {
        this.isLoading = true;
        this.render();

        try {
            // Simulated API call
            await new Promise(r => setTimeout(r, 600));
            
            this.notifications = [
                {
                    id: 1,
                    channel: 'telegram',
                    recipient: '-1001234567890',
                    message: 'Alert: Suspicious activity detected on @elonmusk',
                    status: 'sent',
                    error: null,
                    createdAt: '2024-03-20T10:30:00Z'
                },
                {
                    id: 2,
                    channel: 'whatsapp',
                    recipient: '+1234567890',
                    message: 'Alert: New post from monitored account @sama',
                    status: 'sent',
                    error: null,
                    createdAt: '2024-03-20T09:15:00Z'
                },
                {
                    id: 3,
                    channel: 'telegram',
                    recipient: '-1001234567890',
                    message: 'Alert: Status change on account +1-555-0123',
                    status: 'failed',
                    error: 'Chat not found',
                    createdAt: '2024-03-20T08:45:00Z'
                },
                {
                    id: 4,
                    channel: 'whatsapp',
                    recipient: '+1234567890',
                    message: 'Test message: WhatsApp configuration verified',
                    status: 'pending',
                    error: null,
                    createdAt: '2024-03-20T08:30:00Z'
                },
                {
                    id: 5,
                    channel: 'telegram',
                    recipient: '-1001234567890',
                    message: 'Alert: Multiple failed login attempts detected',
                    status: 'sent',
                    error: null,
                    createdAt: '2024-03-19T22:00:00Z'
                },
                {
                    id: 6,
                    channel: 'whatsapp',
                    recipient: '+1234567890',
                    message: 'Alert: Account @naval posted flagged content',
                    status: 'sent',
                    error: null,
                    createdAt: '2024-03-19T18:30:00Z'
                }
            ];
            
            this.isLoading = false;
            this.applyFilters();
        } catch (err) {
            this.isLoading = false;
            this.dispatchEvent(new CustomEvent('toast', {
                detail: { type: 'error', title: 'Error', message: 'Failed to load notifications' },
                bubbles: true,
                composed: true
            }));
            this.render();
        }
    }

    applyFilters() {
        this.filteredNotifications = this.notifications.filter(n => {
            const matchChannel = this.channelFilter === 'all' || n.channel === this.channelFilter;
            const matchStatus = this.statusFilter === 'all' || n.status === this.statusFilter;
            return matchChannel && matchStatus;
        });
        this.render();
    }

    onChannelChange(value) {
        this.channelFilter = value;
        this.applyFilters();
    }

    onStatusChange(value) {
        this.statusFilter = value;
        this.applyFilters();
    }

    formatDate(dateString) {
        const date = new Date(dateString);
        return date.toLocaleString('en-US', { 
            month: 'short', 
            day: 'numeric', 
            hour: '2-digit', 
            minute: '2-digit' 
        });
    }

    timeAgo(dateString) {
        const date = new Date(dateString);
        const now = new Date();
        const seconds = Math.floor((now - date) / 1000);
        
        let interval = Math.floor(seconds / 86400);
        if (interval > 1) return `${interval} days ago`;
        if (interval === 1) return 'Yesterday';
        
        interval = Math.floor(seconds / 3600);
        if (interval > 1) return `${interval} hours ago`;
        if (interval === 1) return '1 hour ago';
        
        interval = Math.floor(seconds / 60);
        if (interval > 1) return `${interval} minutes ago`;
        
        return 'Just now';
    }

    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }

    getStatusConfig(status) {
        const configs = {
            sent: { bg: 'bg-green-100', text: 'text-green-800', dot: 'bg-green-500' },
            pending: { bg: 'bg-yellow-100', text: 'text-yellow-800', dot: 'bg-yellow-500' },
            failed: { bg: 'bg-red-100', text: 'text-red-800', dot: 'bg-red-500' }
        };
        return configs[status] || configs.pending;
    }

    render() {
        const loadingHtml = `
            <div class="py-16">
                <div class="flex flex-col items-center justify-center">
                    <div class="w-12 h-12 border-4 border-amber-200 border-t-amber-500 rounded-full animate-spin"></div>
                    <p class="mt-4 text-gray-600 text-sm">Loading notifications...</p>
                </div>
            </div>
        `;

        const emptyHtml = `
            <div class="py-16">
                <div class="flex flex-col items-center justify-center text-center px-4">
                    <div class="w-16 h-16 bg-gray-100 rounded-full flex items-center justify-center mb-4">
                        <svg xmlns="http://www.w3.org/2000/svg" class="w-8 h-8 text-gray-400" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 12h-6l-2 3h-4l-2-3H2"></path><path d="M5.45 5.11L2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z"></path></svg>
                    </div>
                    <h3 class="text-lg font-semibold text-gray-900 mb-2">No notifications found</h3>
                    <p class="text-gray-600 text-sm">No notifications match your filter criteria</p>
                </div>
            </div>
        `;

        const tableHtml = this.filteredNotifications.length > 0 ? `
            <div class="overflow-x-auto">
                <table class="min-w-full divide-y divide-gray-200">
                    <thead class="bg-gray-50">
                        <tr>
                            <th scope="col" class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase tracking-wider">Created</th>
                            <th scope="col" class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase tracking-wider">Channel</th>
                            <th scope="col" class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase tracking-wider">Recipient</th>
                            <th scope="col" class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase tracking-wider">Status</th>
                            <th scope="col" class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase tracking-wider">Message</th>
                            <th scope="col" class="px-6 py-3 text-left text-xs font-semibold text-gray-500 uppercase tracking-wider">Error</th>
                        </tr>
                    </thead>
                    <tbody class="bg-white divide-y divide-gray-200">
                        ${this.filteredNotifications.map((n, i) => {
                            const sc = this.getStatusConfig(n.status);
                            return `
                                <tr class="hover:bg-gray-50/80 transition-colors duration-200" style="animation: fadeIn 0.3s ease-out ${i * 0.03}s both;">
                                    <td class="px-6 py-4 whitespace-nowrap">
                                        <div class="text-sm text-gray-900">${this.formatDate(n.createdAt)}</div>
                                        <div class="text-xs text-gray-500">${this.timeAgo(n.createdAt)}</div>
                                    </td>
                                    <td class="px-6 py-4 whitespace-nowrap">
                                        <span class="inline-flex items-center gap-1.5 text-sm font-medium capitalize">
                                            ${n.channel === 'telegram' 
                                                ? '<svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4 text-blue-500" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="22" y1="2" x2="11" y2="13"></line><polygon points="22 2 15 22 11 13 2 9 22 2"></polygon></svg>' 
                                                : '<svg xmlns="http://www.w3.org/2000/svg" class="w-4 h-4 text-green-500" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 11.5a8.38 8.38 0 0 1-.9 3.8 8.5 8.5 0 0 1-7.6 4.7 8.38 8.38 0 0 1-3.8-.9L3 21l1.9-5.7a8.38 8.38 0 0 1-.9-3.8 8.5 8.5 0 0 1 4.7-7.6 8.38 8.38 0 0 1 3.8-.9h.5a8.48 8.48 0 0 1 8 8v.5z"></path></svg>'}
                                            ${n.channel}
                                        </span>
                                    </td>
                                    <td class="px-6 py-4 whitespace-nowrap">
                                        <code class="text-sm text-gray-700 bg-gray-100 px-2 py-1 rounded">${n.recipient}</code>
                                    </td>
                                    <td class="px-6 py-4 whitespace-nowrap">
                                        <span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium ${sc.bg} ${sc.text}">
                                            <span class="w-1.5 h-1.5 ${sc.dot} rounded-full mr-1.5 ${n.status === 'pending' ? 'animate-pulse' : ''}"></span>
                                            ${n.status.charAt(0).toUpperCase() + n.status.slice(1)}
                                        </span>
                                    </td>
                                    <td class="px-6 py-4">
                                        <p class="text-sm text-gray-700 max-w-xs truncate" title="${this.escapeHtml(n.message)}">${this.escapeHtml(n.message)}</p>
                                    </td>
                                    <td class="px-6 py-4">
                                        ${n.error ? `<span class="text-sm text-red-600" title="${this.escapeHtml(n.error)}">${this.escapeHtml(n.error.slice(0, 30))}${n.error.length > 30 ? '...' : ''}</span>` : '<span class="text-sm text-gray-400">-</span>'}
                                    </td>
                                </tr>
                            `;
                        }).join('')}
                    </tbody>
                </table>
            </div>
        ` : emptyHtml;

        this.shadowRoot.innerHTML = `
            <style>
                @import url('https://cdn.tailwindcss.com');
                
                :host {
                    display: block;
                }
                
                @keyframes fadeIn {
                    from { opacity: 0; transform: translateY(10px); }
                    to { opacity: 1; transform: translateY(0); }
                }
                
                .table-row-hover:hover::before {
                    opacity: 1;
                }
            </style>
            
            <div class="bg-white rounded-xl border border-gray-200 shadow-sm overflow-hidden animate-slide-up">
                <div class="px-6 py-4 border-b border-gray-200 bg-gray-50/50">
                    <div class="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
                        <h2 class="text-lg font-semibold text-gray-900">Notification Log</h2>
                        <div class="flex items-center gap-3">
                            <select id="channel-filter" class="px-3 py-2 border border-gray-300 rounded-lg text-sm focus:ring-2 focus:ring-amber-500 focus:border-amber-500 bg-white">
                                <option value="all" ${this.channelFilter === 'all' ? 'selected' : ''}>All Channels</option>
                                <option value="telegram" ${this.channelFilter === 'telegram' ? 'selected' : ''}>Telegram</option>
                                <option value="whatsapp" ${this.channelFilter === 'whatsapp' ? 'selected' : ''}>WhatsApp</option>
                            </select>
                            <select id="status-filter" class="px-3 py-2 border border-gray-300 rounded-lg text-sm focus:ring-2 focus:ring-amber-500 focus:border-amber-500 bg-white">
                                <option value="all" ${this.statusFilter === 'all' ? 'selected' : ''}>All Statuses</option>
                                <option value="sent" ${this.statusFilter === 'sent' ? 'selected' : ''}>Sent</option>
                                <option value="pending" ${this.statusFilter === 'pending' ? 'selected' : ''}>Pending</option>
                                <option value="failed" ${this.statusFilter === 'failed' ? 'selected' : ''}>Failed</option>
                            </select>
                        </div>
                    </div>
                </div>
                
                ${this.isLoading ? loadingHtml : tableHtml}
            </div>
        `;

        // Attach event listeners
        if (!this.isLoading) {
            this.shadowRoot.getElementById('channel-filter')?.addEventListener('change', (e) => this.onChannelChange(e.target.value));
            this.shadowRoot.getElementById('status-filter')?.addEventListener('change', (e) => this.onStatusChange(e.target.value));
        }
    }
}

customElements.define('notification-log', NotificationLog);