const CACHE_NAME = 'tortugotchi-v10';
const ASSETS = [
  './',
  './index.html',
  './style.css',
  './app.js',
  './manifest.json',
  './icon-192.png',
  './icon-512.png'
];

// Install Event
self.addEventListener('install', (e) => {
  e.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      console.log('[Service Worker] Caching all app shell assets');
      return cache.addAll(ASSETS);
    }).then(() => self.skipWaiting())
  );
});

// Activate Event
self.addEventListener('activate', (e) => {
  e.waitUntil(
    caches.keys().then((keys) => {
      return Promise.all(
        keys.map((key) => {
          if (key !== CACHE_NAME) {
            console.log('[Service Worker] Removing old cache', key);
            return caches.delete(key);
          }
        })
      );
    }).then(() => self.clients.claim())
  );
});

// Fetch Event
self.addEventListener('fetch', (e) => {
  e.respondWith(
    caches.match(e.request).then((cachedResponse) => {
      // Return cached version or fetch from network
      return cachedResponse || fetch(e.request).catch(() => {
        // Fallback for document requests if completely offline
        if (e.request.destination === 'document') {
          return caches.match('./index.html');
        }
      });
    })
  );
});