// Enhanced notification management for LittleShop Admin
// Handles real-time order notifications and admin alerts

class AdminNotificationManager {
    constructor() {
        this.isSetupComplete = false;
        this.notificationQueue = [];
        this.init();
    }

    async init() {
        console.log('Admin Notifications: Initializing...');

        // Wait for PWA manager to be ready
        if (window.pwaManager) {
            await this.setupOrderNotifications();
        } else {
            // Wait for PWA manager to load
            setTimeout(() => this.init(), 1000);
        }
    }

    async setupOrderNotifications() {
        try {
            // Ensure push notifications are enabled
            if (!window.pwaManager.pushSubscription) {
                console.log('Admin Notifications: Setting up push notifications...');

                // Show admin-specific notification prompt
                this.showAdminNotificationPrompt();
                return;
            }

            this.isSetupComplete = true;
            this.addNotificationStatusIndicator();
            this.setupTestNotificationButton();

            console.log('Admin Notifications: Setup complete');
        } catch (error) {
            console.error('Admin Notifications: Setup failed:', error);
        }
    }

    showAdminNotificationPrompt() {
        // Check if prompt already exists
        if (document.getElementById('admin-notification-prompt')) {
            return;
        }

        const promptDiv = document.createElement('div');
        promptDiv.id = 'admin-notification-prompt';
        promptDiv.className = 'alert alert-warning alert-dismissible position-fixed';
        promptDiv.style.cssText = `
            top: 80px;
            right: 20px;
            z-index: 1055;
            max-width: 400px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        `;

        promptDiv.innerHTML = `
            <div class="d-flex align-items-center">
                <i class="fas fa-bell-slash text-warning me-3 fa-2x"></i>
                <div class="flex-grow-1">
                    <h6 class="alert-heading mb-1">Enable Order Notifications</h6>
                    <p class="mb-2">Get instant alerts for new orders, payments, and status changes.</p>
                    <div class="d-flex gap-2">
                        <button type="button" class="btn btn-warning btn-sm" id="enable-admin-notifications">
                            <i class="fas fa-bell me-1"></i>Enable Now
                        </button>
                        <button type="button" class="btn btn-outline-secondary btn-sm" id="remind-later">
                            Later
                        </button>
                    </div>
                </div>
            </div>
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
        `;

        document.body.appendChild(promptDiv);

        // Add event listeners
        document.getElementById('enable-admin-notifications').addEventListener('click', async () => {
            try {
                await this.enableNotifications();
                promptDiv.remove();
            } catch (error) {
                console.error('Failed to enable notifications:', error);
                this.showNotificationError('Failed to enable notifications. Please try again.');
            }
        });

        document.getElementById('remind-later').addEventListener('click', () => {
            promptDiv.remove();
            // Set reminder for 1 hour
            setTimeout(() => this.showAdminNotificationPrompt(), 60 * 60 * 1000);
        });
    }

    async enableNotifications() {
        const button = document.getElementById('enable-admin-notifications');
        const originalText = button.innerHTML;

        button.disabled = true;
        button.innerHTML = '<i class="fas fa-spinner fa-spin me-1"></i>Enabling...';

        try {
            await window.pwaManager.subscribeToPushNotifications();

            // Show success message
            this.showNotificationSuccess('✅ Order notifications enabled successfully!');

            // Complete setup
            await this.setupOrderNotifications();

        } finally {
            button.disabled = false;
            button.innerHTML = originalText;
        }
    }

    addNotificationStatusIndicator() {
        // Add status indicator to admin header/navbar
        const navbar = document.querySelector('.navbar-nav');
        if (!navbar || document.getElementById('notification-status')) {
            return;
        }

        const statusItem = document.createElement('li');
        statusItem.className = 'nav-item dropdown';
        statusItem.innerHTML = `
            <a class="nav-link dropdown-toggle" href="#" id="notification-status" role="button" data-bs-toggle="dropdown">
                <i class="fas fa-bell text-success"></i>
                <span class="d-none d-md-inline ms-1">Notifications</span>
                <span id="notification-badge" class="badge bg-danger ms-1" style="display: none;">0</span>
            </a>
            <ul class="dropdown-menu dropdown-menu-end">
                <li><h6 class="dropdown-header">Notification Settings</h6></li>
                <li><a class="dropdown-item" href="#" id="test-notification">
                    <i class="fas fa-vial me-2"></i>Send Test Notification
                </a></li>
                <li><a class="dropdown-item" href="#" id="notification-history">
                    <i class="fas fa-history me-2"></i>Recent Notifications
                </a></li>
                <li><hr class="dropdown-divider"></li>
                <li><a class="dropdown-item text-danger" href="#" id="disable-notifications">
                    <i class="fas fa-bell-slash me-2"></i>Disable Notifications
                </a></li>
            </ul>
        `;

        navbar.appendChild(statusItem);

        // Add event listeners
        document.getElementById('test-notification').addEventListener('click', (e) => {
            e.preventDefault();
            this.sendTestNotification();
        });

        document.getElementById('disable-notifications').addEventListener('click', (e) => {
            e.preventDefault();
            this.disableNotifications();
        });
    }

    setupTestNotificationButton() {
        // Add test button to dashboard if we're on the dashboard page
        const dashboardContent = document.querySelector('.dashboard-content, .admin-dashboard');
        if (!dashboardContent) {
            return;
        }

        const testButton = document.createElement('button');
        testButton.className = 'btn btn-outline-primary btn-sm me-2';
        testButton.innerHTML = '<i class="fas fa-bell me-1"></i>Test Notification';
        testButton.onclick = () => this.sendTestNotification();

        // Find a good place to add it (e.g., near page title)
        const pageTitle = document.querySelector('h1, .page-title');
        if (pageTitle) {
            pageTitle.parentNode.insertBefore(testButton, pageTitle.nextSibling);
        }
    }

    async sendTestNotification() {
        try {
            const response = await fetch('/api/push/test', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    title: '🧪 Test Notification',
                    body: 'LittleShop admin notifications are working perfectly!'
                }),
                credentials: 'same-origin'
            });

            if (response.ok) {
                this.showNotificationSuccess('Test notification sent!');
            } else {
                throw new Error('Failed to send test notification');
            }
        } catch (error) {
            console.error('Test notification failed:', error);
            this.showNotificationError('Failed to send test notification');
        }
    }

    async disableNotifications() {
        if (confirm('Are you sure you want to disable order notifications?')) {
            try {
                await window.pwaManager.unsubscribeFromPushNotifications();

                // Remove status indicator
                const statusElement = document.getElementById('notification-status');
                if (statusElement) {
                    statusElement.closest('.nav-item').remove();
                }

                this.showNotificationSuccess('Notifications disabled');

                // Reset setup status
                this.isSetupComplete = false;

            } catch (error) {
                console.error('Failed to disable notifications:', error);
                this.showNotificationError('Failed to disable notifications');
            }
        }
    }

    showNotificationSuccess(message) {
        this.showToast(message, 'success');
    }

    showNotificationError(message) {
        this.showToast(message, 'danger');
    }

    showToast(message, type = 'info') {
        const toast = document.createElement('div');
        toast.className = `alert alert-${type} alert-dismissible position-fixed`;
        toast.style.cssText = `
            top: 20px;
            right: 20px;
            z-index: 1060;
            min-width: 300px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        `;
        toast.innerHTML = `
            ${message}
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
        `;

        document.body.appendChild(toast);

        // Auto-remove after 5 seconds
        setTimeout(() => {
            if (toast.parentNode) {
                toast.remove();
            }
        }, 5000);
    }

    // Handle incoming notifications (if using WebSocket/SignalR in future)
    handleOrderNotification(data) {
        if (!this.isSetupComplete) {
            this.notificationQueue.push(data);
            return;
        }

        // Update notification badge
        this.updateNotificationBadge();

        // Show browser notification if page is not visible
        if (document.hidden && window.pwaManager) {
            window.pwaManager.showNotification(data.title, {
                body: data.body,
                icon: '/icons/icon-192x192.png',
                badge: '/icons/icon-72x72.png',
                tag: 'order-notification',
                requireInteraction: true,
                actions: [
                    { action: 'view', title: 'View Order' },
                    { action: 'dismiss', title: 'Dismiss' }
                ]
            });
        }
    }

    updateNotificationBadge(count = null) {
        const badge = document.getElementById('notification-badge');
        if (!badge) return;

        if (count === null) {
            // Get current count and increment
            const currentCount = parseInt(badge.textContent) || 0;
            count = currentCount + 1;
        }

        if (count > 0) {
            badge.textContent = count;
            badge.style.display = 'inline';
        } else {
            badge.style.display = 'none';
        }
    }
}

// Initialize admin notification manager
document.addEventListener('DOMContentLoaded', () => {
    window.adminNotificationManager = new AdminNotificationManager();
});

// Export for global access
window.AdminNotificationManager = AdminNotificationManager;