const CACHE = 'otaman-v1';
const URLS = [
  'index.html',
  'style.css',
  'sim.png',
  'icon-192.png',
  'icon-512.png',
  'manifest.json',
  'des-bundle.js',
];

self.addEventListener('install', e => {
  e.waitUntil(
    caches.open(CACHE).then(c => c.addAll(URLS))
  );
  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.addEventListener('fetch', e => {
  e.respondWith(
    caches.match(e.request).then(r => r || fetch(e.request).then(res => {
      const clone = res.clone();
      caches.open(CACHE).then(c => c.put(e.request, clone));
      return res;
    }))
  );
});