const CACHE = 'dickendock-v1';

self.addEventListener('install', () => 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())
  );
});

self.addEventListener('fetch', e => {
  const url = e.request.url;

  // API immer live
  if (url.includes('/api/')) {
    e.respondWith(fetch(e.request).catch(() => new Response('Offline', { status: 503 })));
    return;
  }

  // HTML + JS/CSS-Assets: network-first → kein veralteter Cache nach Rebuild
  const isDoc = e.request.mode === 'navigate' || url.endsWith('.js') || url.endsWith('.css');
  if (isDoc) {
    e.respondWith(
      fetch(e.request)
        .then(res => {
          if (res.ok) caches.open(CACHE).then(c => c.put(e.request, res.clone()));
          return res;
        })
        .catch(() => caches.match(e.request))
    );
    return;
  }

  // Alles andere (Bilder, Fonts, Manifests): cache-first
  e.respondWith(
    caches.match(e.request).then(cached => {
      if (cached) return cached;
      return fetch(e.request).then(res => {
        if (res.ok) caches.open(CACHE).then(c => c.put(e.request, res.clone()));
        return res;
      });
    })
  );
});