/* Dashboard Studio service worker: always the network first, so updates show straight away.
 * When the network fails (or Home Assistant's ingress session has run out), it answers with
 * the last good copy, so the app can start, show the last known states and reconnect. */
const CACHE = "ds-__VERSION__";
const SKIP = /\/(ws|api\/camera|api\/immich|api\/history)/;

self.addEventListener("install", () => self.skipWaiting());
self.addEventListener("activate", (e) => {
  e.waitUntil(caches.keys().then((keys) => Promise.all(keys.filter((k) => k.startsWith("ds-") && k !== CACHE).map((k) => caches.delete(k)))).then(() => self.clients.claim()));
});
self.addEventListener("fetch", (e) => {
  const req = e.request, url = new URL(req.url);
  if (req.method !== "GET" || url.origin !== location.origin || SKIP.test(url.pathname)) return;
  const page = req.mode === "navigate";
  e.respondWith((async () => {
    const cache = await caches.open(CACHE);
    try {
      const res = await fetch(req);
      if (res.ok) {
        cache.put(page ? new Request(new URL("./", self.registration.scope)) : req, res.clone());
        return res;
      }
      if (!page) return res;
      // Signed out of Home Assistant: the last good copy renews the session itself. Without one, pass
      // the refusal on, so Haven knows to sign in again.
      return (await cache.match(new URL("./", self.registration.scope).href)) || res;
    } catch (err) {
      const hit = page ? await cache.match(new URL("./", self.registration.scope).href) : await cache.match(req);
      if (hit) return hit;
      throw err;
    }
  })());
});