/* Basic offline-first service worker */
const CACHE_NAME = 'indieweb-blog-v1';
const OFFLINE_URLS = [
  '/',
  '/assets/css/build.css',
  '/assets/js/main.js',
  '/assets/favicon-32x32.png',
  '/assets/apple-touch-icon.png'
];

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

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((keys) => Promise.all(keys.map((k) => (k === CACHE_NAME ? null : caches.delete(k))))).then(() => self.clients.claim())
  );
});

self.addEventListener('fetch', (event) => {
  const { request } = event;
  if (request.method !== 'GET') return;
  event.respondWith(
    caches.match(request).then((cached) =>
      cached || fetch(request).then((resp) => {
        const respClone = resp.clone();
        caches.open(CACHE_NAME).then((cache) => cache.put(request, respClone));
        return resp;
      }).catch(() => caches.match('/'))
    )
  );
});