// NotifyPulse PWA Service Worker v3
const CACHE = 'notifypulse-v3';
const STATIC = ['/pwa/', '/pwa/index.html'];

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

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

self.addEventListener('fetch', e => {
  const url = new URL(e.request.url);
  // Never cache API calls
  if (url.pathname.startsWith('/api/')) return;
  e.respondWith(
    caches.match(e.request).then(r => r || fetch(e.request).then(res => {
      if (res.ok && e.request.method === 'GET') {
        const clone = res.clone();
        caches.open(CACHE).then(c => c.put(e.request, clone));
      }
      return res;
    }).catch(() => caches.match('/pwa/')))
  );
});

// Handle messages from main thread
self.addEventListener('message', e => {
  if (e.data === 'skipWaiting') self.skipWaiting();
});