// Offline app shell for the installed PWA. Only the player's own files are cached:
// feeds must stay fresh, and audio (range requests, often hundreds of MB) and the
// /fips/ gateway always go straight to the network.
const CACHE = 'podsteadr-player-v1';
const SHELL = ['./', 'manifest.webmanifest', 'icons/icon.svg', 'icons/icon-192.png', 'icons/icon-512.png'];

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

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

self.addEventListener('fetch', (event) => {
  const { request } = event;
  const url = new URL(request.url);
  const scope = new URL(self.registration.scope);
  if (
    request.method !== 'GET' ||
    url.origin !== scope.origin ||
    url.pathname.startsWith(`${scope.pathname}fips/`) ||
    request.headers.has('range')
  ) {
    return;
  }

  // Page loads: network first so a deploy shows up immediately; cached shell when offline.
  if (request.mode === 'navigate') {
    event.respondWith(
      fetch(request)
        .then((res) => {
          const copy = res.clone();
          caches.open(CACHE).then((cache) => cache.put('./', copy));
          return res;
        })
        .catch(() => caches.match('./')),
    );
    return;
  }

  // Hashed build assets and icons never change under the same URL: cache first.
  event.respondWith(
    caches.match(request).then(
      (hit) =>
        hit ||
        fetch(request).then((res) => {
          if (res.ok) {
            const copy = res.clone();
            caches.open(CACHE).then((cache) => cache.put(request, copy));
          }
          return res;
        }),
    ),
  );
});