// App-shell cache only; Seafile/API traffic always goes to the network.
const CACHE = 'hub-v7';
const SHELL = ['/icon.svg', '/manifest.webmanifest', '/icons/icon-192.png', '/icons/apple-touch-icon.png'];

// Install: keep the icons, and (when signed in) the page itself with the scripts and styles it names, so the app opens offline.
async function precache() {
  const c = await caches.open(CACHE);
  await c.addAll(SHELL);
  try {
    const r = await fetch('/', { credentials: 'same-origin', redirect: 'manual' });
    if (r.ok) {
      const html = await r.clone().text();
      await c.put('/', r);
      const urls = [...html.matchAll(/(?:src|href)="(\/[^"]+\.(?:js|css)(?:\?[^"]*)?)"/g)].map(m => m[1]);
      await Promise.all(urls.map(u => c.add(u).catch(() => {})));
    }
  } catch { /* signed out or offline: it is cached the first time it is used */ }
}
self.addEventListener('install', e => { e.waitUntil(precache()); self.skipWaiting(); });
self.addEventListener('activate', e => {
  e.waitUntil(caches.keys().then(ks => Promise.all(ks.filter(k => k !== CACHE).map(k => caches.delete(k)))));
  self.clients.claim();
});
self.addEventListener('fetch', e => {
  const u = new URL(e.request.url);
  if (e.request.method !== 'GET' || u.origin !== location.origin || u.pathname.startsWith('/sf/') || u.pathname.startsWith('/plex/') || u.pathname.startsWith('/webmail') || u.pathname.startsWith('/api/')) return;
  e.respondWith(fetch(e.request).then(r => {
    if (r.ok) { const copy = r.clone(); caches.open(CACHE).then(c => c.put(e.request, copy)); }
    return r;
  }).catch(() => caches.match(e.request)));
});