// The service worker is what lets the site be installed as an app. It caches nothing but the
// offline page: every request still goes to the network, so nobody sees stale bans or ranks.

const CACHE = "offline-v1";
const OFFLINE = "/static/offline.html";

self.addEventListener("install", (e) => {
  e.waitUntil(caches.open(CACHE).then((c) => c.add(OFFLINE)).then(() => self.skipWaiting()));
});

self.addEventListener("activate", (e) => {
  e.waitUntil(
    caches.keys()
      .then((keys) => Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
      .then(() => self.clients.claim()),
  );
});

// Only page loads get the offline page; API calls fail as they always have, and the pages say so.
self.addEventListener("fetch", (e) => {
  if (e.request.mode !== "navigate") return;
  e.respondWith(fetch(e.request).catch(() => caches.match(OFFLINE)));
});