const CACHE_NAME = "cents-shell-v2";
const APP_SHELL = ["/", "/manifest.webmanifest", "/icon.svg"];

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

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

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

  event.respondWith(
    caches.match(event.request).then((cached) => {
      if (cached) return cached;
      return fetch(event.request).catch(() => caches.match("/"));
    }),
  );
});