const CACHE_NAME = 'vibetorrent-v1';
const ASSETS_TO_CACHE = [
    '/',
    '/index.html',
    '/manifest.json',
    '/icon-192.png',
    '/icon-512.png'
];

// Install event - cache assets
self.addEventListener('install', (event) => {
    console.log('[Service Worker] Installing...');
    event.waitUntil(
        caches.open(CACHE_NAME).then((cache) => {
            console.log('[Service Worker] Caching static assets');
            return cache.addAll(ASSETS_TO_CACHE);
        }).then(() => {
            console.log('[Service Worker] Skip waiting');
            return self.skipWaiting();
        })
    );
});

// Activate event - clean old caches
self.addEventListener('activate', (event) => {
    console.log('[Service Worker] Activating...');
    event.waitUntil(
        caches.keys().then((cacheNames) => {
            return Promise.all(
                cacheNames.map((key) => {
                    if (key !== CACHE_NAME) {
                        console.log('[Service Worker] Deleting old cache:', key);
                        return caches.delete(key);
                    }
                })
            );
        }).then(() => {
            console.log('[Service Worker] Claiming clients');
            return self.clients.claim();
        })
    );
});

// Fetch event - network first, cache fallback for API calls
self.addEventListener('fetch', (event) => {
    const url = new URL(event.request.url);
    
    // Network-first strategy for API calls
    if (url.pathname.startsWith('/api/')) {
        event.respondWith(
            fetch(event.request)
                .catch(() => {
                    // Could return cached API response or offline page
                    return new Response(
                        JSON.stringify({ error: 'Offline' }),
                        { headers: { 'Content-Type': 'application/json' } }
                    );
                })
        );
        return;
    }
    
    // Cache-first strategy for static assets
    event.respondWith(
        caches.match(event.request).then((response) => {
            return response || fetch(event.request).then((fetchResponse) => {
                // Optionally cache new requests
                if (fetchResponse && fetchResponse.status === 200) {
                    const responseToCache = fetchResponse.clone();
                    caches.open(CACHE_NAME).then((cache) => {
                        cache.put(event.request, responseToCache);
                    });
                }
                return fetchResponse;
            });
        })
    );
});

// Notification click event - focus or open app
self.addEventListener('notificationclick', (event) => {
    console.log('[Service Worker] Notification clicked:', event.notification.tag);
    event.notification.close();
    
    event.waitUntil(
        clients.matchAll({ type: 'window', includeUncontrolled: true }).then((clientList) => {
            // If app is already open, focus it
            for (let client of clientList) {
                if (client.url === '/' && 'focus' in client) {
                    return client.focus();
                }
            }
            // Otherwise open new window
            if (clients.openWindow) {
                return clients.openWindow('/');
            }
        })
    );
});

// Push notification event (for future use)
self.addEventListener('push', (event) => {
    console.log('[Service Worker] Push received');
    const data = event.data ? event.data.json() : {};
    
    const options = {
        body: data.message || 'New notification',
        icon: '/icon-192.png',
        badge: '/icon-192.png',
        tag: data.tag || 'vibetorrent-notification',
        requireInteraction: false,
    };
    
    event.waitUntil(
        self.registration.showNotification(data.title || 'VibeTorrent', options)
    );
});