const CACHE_NAME = 'timetracker-v1';
// This list should include all the essential files for your app's shell.
const filesToCache = [
  '/',
  '/index.html',
  '/style/style.css',
  '/js/main.js',
  '/js/ui.js',
  '/js/api.js',
  '/js/utils.js',
  '/images/icon-192x192.png',
  '/images/icon-512x512.png'
];

// The install event runs when the service worker is first installed.
self.addEventListener('install', event => {
  console.log('Service worker install event!');
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => {
        console.log('Caching app shell');
        return cache.addAll(filesToCache);
      })
  );
});

// The fetch event runs for every network request the page makes.
self.addEventListener('fetch', event => {
  // We only want to handle GET requests.
  if (event.request.method !== 'GET' || event.request.url.includes('/api/')) {
    return;
  }
  
  event.respondWith(
    caches.match(event.request)
      .then(response => {
        // If we have a cached version, return it.
        // Otherwise, fetch it from the network.
        return response || fetch(event.request);
      })
  );
});