self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open('app-cache').then((cache) => {
      // Use a more robust approach: attempt to cache but don't fail the whole installation if one fails
      const urlsToCache = [
        '/assets/manifest.json',
        '/assets/favicon.png'
      ];
      
      return Promise.all(
        urlsToCache.map(url => {
          return fetch(url).then(response => {
            if (response.ok) {
              return cache.put(url, response);
            }
          }).catch(err => console.warn('SW: Failed to cache ' + url, err));
        })
      );
    })
  );
});

self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request).then((response) => {
      return response || fetch(event.request);
    })
  );
});