const CACHE_NAME = "readabook-shell-v1";
const SHELL = ["/", "/home", "/manifest.webmanifest", "/icons/readabook.svg"];

self.addEventListener("install", (event) => {
  event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(SHELL)));
  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 url = new URL(event.request.url);
  if (event.request.method !== "GET" || ["/auth", "/admin", "/books", "/progress"].some((path) => url.pathname.startsWith(path))) {
    return;
  }
  event.respondWith(fetch(event.request).catch(() => caches.match(event.request).then((hit) => hit || caches.match("/"))));
});