const CACHE = 'bri-tunes-v1';
const STATIC_PRECACHE = [
  '/',
  '/static/css/app.css',
  '/static/js/player.js',
  '/static/js/navigate.js',
  '/static/js/bg-grid.js',
  '/static/js/player-viz.js',
  '/static/js/boot-sequence.js',
  '/static/vendor/fonts/Orbitron.woff2',
  '/static/vendor/fonts/Inter.woff2',
  '/static/vendor/three/three.module.min.js',
];

self.addEventListener('install', (e) => {
  e.waitUntil(caches.open(CACHE).then((c) => c.addAll(STATIC_PRECACHE)));
  self.skipWaiting();
});

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

self.addEventListener('fetch', (e) => {
  const { request } = e;
  const url = new URL(request.url);

  // Never intercept audio streams or cross-origin requests.
  if (url.pathname.startsWith('/stream/') || url.origin !== self.location.origin) return;

  // Static assets: cache-first.
  if (url.pathname.startsWith('/static/')) {
    e.respondWith(
      caches.match(request).then((cached) => cached || fetch(request))
    );
    return;
  }

  // HTML pages: network-first, fall back to cache.
  e.respondWith(
    fetch(request)
      .then((res) => {
        const clone = res.clone();
        caches.open(CACHE).then((c) => c.put(request, clone));
        return res;
      })
      .catch(() => caches.match(request))
  );
});