const CACHE_NAME = 'nexus-timer-cache-v2';
const urlsToCache = [
  '/',
  '/index.html',
  '/manifest.json',
  '/favicon.ico',
  '/icons/icon-192x192.png',
  '/icons/icon-512x512.png',
  // Add other static assets here, like JS/CSS bundles if not dynamically named
  // Vite typically names bundles with hashes, so caching them directly might be tricky
  // For a PWA, focus on caching the app shell and key static assets
];

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => {
        console.log('Opened cache');
        return cache.addAll(urlsToCache);
      })
  );
});

self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request)
      .then(response => {
        if (response) {
          return response; // Serve from cache
        }
        return fetch(event.request); // Fetch from network
      })
  );
});

self.addEventListener('activate', event => {
  const cacheWhitelist = [CACHE_NAME];
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return Promise.all(
        cacheNames.map(cacheName => {
          if (cacheWhitelist.indexOf(cacheName) === -1) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});