const CACHE = 'astraea-v1';
const ASSETS = ['/', '/static/manifest.json', '/static/icon-192.png', '/static/icon-512.png'];

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

// Network-first for everything except static assets (the app shell is tiny;
// API responses must never be served stale).
self.addEventListener('fetch', (e) => {
  const url = new URL(e.request.url);
  if (e.request.method !== 'GET') return;
  if (url.pathname.startsWith('/api/')) return; // always live

  e.respondWith(
    fetch(e.request)
      .then((resp) => {
        const copy = resp.clone();
        caches.open(CACHE).then((c) => c.put(e.request, copy));
        return resp;
      })
      .catch(() => caches.match(e.request).then((c) => c || caches.match('/')))
  );
});