const CACHE = 'ns-v24';
const PRECACHE = ['/', 'index.html', 'styles.css', 'app.js', 'manifest.json', 'icon.svg'];
const SKIP_PATHS = ['/rest/stream', '/rest/download', '/config.js'];

self.addEventListener('install', e => {
  e.waitUntil(caches.open(CACHE).then(c => c.addAll(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))))
      .then(() => self.clients.claim())
      .then(() => self.clients.matchAll({type: 'window', includeUncontrolled: true}))
      .then(clients => clients.forEach(c => c.navigate(c.url)))
  );
});

self.addEventListener('fetch', e => {
  if (!e.request.url.startsWith(self.location.origin)) return;
  if (SKIP_PATHS.some(p => e.request.url.includes(p))) return;
  e.respondWith(
    fetch(e.request)
      .then(res => {
        if (res.status === 200 && e.request.method === 'GET') {
          const clone = res.clone();
          caches.open(CACHE).then(c => c.put(e.request, clone));
        }
        return res;
      })
      .catch(() => caches.match(e.request).then(r => r || Response.error()))
  );
});