const CACHE_NAME = 'tcg-vault-v1';
const urlsToCache = [
  '/',
  '/static/js/bundle.js',
  '/static/css/main.css',
  '/manifest.json',
  '/favicon.ico',
  '/logo192.png',
  '/logo512.png'
];

// Install event
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then((cache) => cache.addAll(urlsToCache))
      .catch((error) => {
        console.error('Failed to cache resources:', error);
      })
  );
});

// Fetch event
self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request)
      .then((response) => {
        // Return cached version or fetch from network
        return response || fetch(event.request);
      })
      .catch((error) => {
        console.error('Fetch failed:', error);
        // Return offline page if available
        return caches.match('/');
      })
  );
});

// Activate event
self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheName !== CACHE_NAME) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});

// Background sync for offline actions
self.addEventListener('sync', (event) => {
  if (event.tag === 'background-sync') {
    event.waitUntil(
      // Handle offline actions when back online
      console.log('Background sync triggered')
    );
  }
});

// Push notifications (for future use)
self.addEventListener('push', (event) => {
  if (event.data) {
    const data = event.data.json();
    const options = {
      body: data.body,
      icon: '/logo192.png',
      badge: '/favicon.ico',
      vibrate: [200, 100, 200]
    };
    
    event.waitUntil(
      self.registration.showNotification(data.title, options)
    );
  }
});

// Notification click
self.addEventListener('notificationclick', (event) => {
  event.notification.close();
  event.waitUntil(
    clients.openWindow('/')
  );
});