const CACHE_NAME = 'mindsift-pwa-v1';
const ASSETS = ['/', '/index.html', '/manifest.json'];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => cache.addAll(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) => {
  if (event.request.method !== 'GET' || event.request.url.includes('/api/')) {
    return;
  }
  event.respondWith(
    fetch(event.request)
      .then((res) => {
        const clone = res.clone();
        caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
        return res;
      })
      .catch(() => caches.match(event.request).then((cached) => cached || caches.match('/')))
  );
});