const CACHE_NAME = 'openreel-image-v1';
const STATIC_ASSETS = [
  '/',
  '/index.html',
  '/manifest.json',
];

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

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

self.addEventListener('fetch', (event) => {
  if (event.request.method !== 'GET') return;

  const url = new URL(event.request.url);
  if (url.origin !== location.origin) return;

  event.respondWith(
    caches.match(event.request).then((cached) => {
      const fetchPromise = fetch(event.request)
        .then((response) => {
          if (response.ok && response.status === 200) {
            const clone = response.clone();
            caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
          }
          return response;
        })
        .catch(() => cached);

      return cached || fetchPromise;
    })
  );
});