const CACHE_NAME = 'kv-tube-v1';
const STATIC_CACHE_URLS = [
  '/',
  '/static/css/style.css',
  '/static/js/main.js',
  '/static/icons/icon-192x192.png',
  '/static/icons/icon-512x512.png',
  '/static/favicon.ico'
];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => cache.addAll(STATIC_CACHE_URLS))
  );
});

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

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return Promise.all(
        cacheNames.filter(cacheName => {
          return cacheName.startsWith('kv-tube-') && cacheName !== CACHE_NAME;
        }).map(cacheName => caches.delete(cacheName))
      );
    })
  );
});