// Ham Lab service worker: cache hashed assets, never the API, network-first for the shell.
const CACHE = 'hamlab-v3'; // bumped when files under /icons/ change: they are served cache-first
self.addEventListener('install', () => self.skipWaiting());
self.addEventListener('activate', (e) => {
  e.waitUntil(caches.keys().then((ks) => Promise.all(ks.filter((k) => k !== CACHE).map((k) => caches.delete(k)))).then(() => self.clients.claim()));
});
self.addEventListener('fetch', (e) => {
  const url = new URL(e.request.url);
  if (e.request.method !== 'GET' || url.origin !== location.origin || url.pathname.startsWith('/api/')) return;
  if (url.pathname.startsWith('/assets/') || url.pathname.startsWith('/icons/')) {
    e.respondWith(caches.open(CACHE).then(async (c) => (await c.match(e.request)) || fetch(e.request).then((r) => { if (r.ok) c.put(e.request, r.clone()); return r; })));
    return;
  }
  // navigations + everything else: network first, fall back to cached index
  e.respondWith(fetch(e.request).then((r) => { if (r.ok && e.request.mode === 'navigate') caches.open(CACHE).then((c) => c.put('/', r.clone())); return r; })
    .catch(() => caches.match(e.request.mode === 'navigate' ? '/' : e.request)));
});