const CACHE_NAME = 'diet-coach-v1';

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

self.addEventListener('fetch', (e) => {
  if (e.request.method !== 'GET' || e.request.url.includes('/api') || e.request.url.includes(':4003')) return;
  e.respondWith(
    fetch(e.request).then(res => {
      const clone = res.clone();
      caches.open(CACHE_NAME).then(c => c.put(e.request, clone));
      return res;
    }).catch(() => caches.match(e.request))
  );
});