const CACHE_NAME = 'pascar-v1';
const ASSETS = [
  './',   
  'index.html',
  'manifest.json'
];

self.addEventListener('install', (e) => {
  self.skipWaiting();
  e.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      console.log('Caching assets');
      return cache.addAll(ASSETS);
    })
  );
});

self.addEventListener('activate', (e) => {
  e.waitUntil(
    Promise.all([
      clients.claim(),
      caches.keys().then((keys) => {
        return Promise.all(
          keys.filter(key => key !== CACHE_NAME).map(key => caches.delete(key))
        );
      })
    ])
  );
});

self.addEventListener('fetch', (e) => {
  e.respondWith(
    caches.match(e.request).then((response) => {
      // Return cached version OR fetch from network
      return response || fetch(e.request);
    }).catch(() => {
      // Fallback for when both cache and network fail
      if (e.request.mode === 'navigate') {
        return caches.match('index.html');
      }
    })
  );
});