/**
 * Service Worker for Web Push Notifications
 *
 * Handles incoming push notifications and displays them to the user.
 */

// Listen for push events
self.addEventListener('push', function(event) {
    console.log('[Service Worker] Push received', event);

    if (!event.data) {
        console.log('[Service Worker] Push event but no data');
        return;
    }

    let notificationData;
    try {
        notificationData = event.data.json();
    } catch (e) {
        console.error('[Service Worker] Failed to parse push data', e);
        notificationData = {
            title: 'Notification',
            body: event.data.text()
        };
    }

    const title = notificationData.title || 'Notification';
    const options = {
        body: notificationData.body || '',
        icon: notificationData.icon || '/assets/icons/notification-icon.png',
        badge: notificationData.badge || '/assets/icons/notification-badge.png',
        image: notificationData.image,
        tag: notificationData.tag || 'default-tag',
        requireInteraction: notificationData.requireInteraction || false,
        silent: notificationData.silent || false,
        actions: notificationData.actions || [],
        data: notificationData.data || {}
    };

    event.waitUntil(
        self.registration.showNotification(title, options)
    );
});

// Listen for notification clicks
self.addEventListener('notificationclick', function(event) {
    console.log('[Service Worker] Notification clicked', event);

    event.notification.close();

    // Handle action button clicks
    if (event.action) {
        console.log('[Service Worker] Action clicked:', event.action);

        // You can handle different actions here
        switch (event.action) {
            case 'open':
                event.waitUntil(clients.openWindow('/'));
                break;
            case 'dismiss':
                // Just close, no action
                break;
            default:
                event.waitUntil(clients.openWindow('/'));
        }
    } else {
        // Regular notification click (not action button)
        const urlToOpen = event.notification.data?.url || '/';

        event.waitUntil(
            clients.matchAll({
                type: 'window',
                includeUncontrolled: true
            })
            .then(function(windowClients) {
                // Check if there is already a window/tab open
                for (let i = 0; i < windowClients.length; i++) {
                    const client = windowClients[i];
                    if (client.url === urlToOpen && 'focus' in client) {
                        return client.focus();
                    }
                }

                // If not, open new window/tab
                if (clients.openWindow) {
                    return clients.openWindow(urlToOpen);
                }
            })
        );
    }
});

// Listen for notification close
self.addEventListener('notificationclose', function(event) {
    console.log('[Service Worker] Notification closed', event);

    // You can track notification dismissals here
    // e.g., send analytics event
});

// Service Worker Installation
self.addEventListener('install', function(event) {
    console.log('[Service Worker] Installing');
    self.skipWaiting(); // Activate immediately
});

// Service Worker Activation
self.addEventListener('activate', function(event) {
    console.log('[Service Worker] Activating');
    event.waitUntil(clients.claim()); // Take control of all pages
});

// Optional: Handle background sync for failed pushes
self.addEventListener('sync', function(event) {
    console.log('[Service Worker] Background sync', event);

    if (event.tag === 'push-sync') {
        event.waitUntil(
            // Retry failed push operations
            Promise.resolve()
        );
    }
});