const CACHE_NAME = 'shangpin-pwa-v1';
const CORE_ASSETS = [
  './',
  './index.html',
  './manifest.webmanifest',
  './icons/icon.svg'
];

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

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

self.addEventListener('fetch', (event) => {
  const { request } = event;
  if (request.method !== 'GET') return;

  event.respondWith(
    caches.match(request).then((cached) => {
      if (cached) return cached;
      return fetch(request)
        .then((networkResponse) => {
          if (request.url.startsWith(self.location.origin) && networkResponse && networkResponse.status === 200) {
            const responseClone = networkResponse.clone();
            caches.open(CACHE_NAME).then((cache) => cache.put(request, responseClone));
          }
          return networkResponse;
        })
        .catch(() => caches.match('./index.html'));
    })
  );
});