const CACHE_NAME = 'stackpilot-v1';
const STATIC_ASSETS = ['/', '/index.html'];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => cache.addAll(STATIC_ASSETS))
  );
  self.skipWaiting();
});

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

self.addEventListener('fetch', (event) => {
  const { request } = event;
  // Don't cache API calls
  if (request.url.includes('/api/')) {
    event.respondWith(fetch(request));
    return;
  }
  // Cache-first for static assets
  event.respondWith(
    caches.match(request).then((cached) => {
      const fetched = fetch(request).then((response) => {
        if (response.ok) {
          const clone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
        }
        return response;
      }).catch(() => cached);
      return cached || fetched;
    })
  );
});