// Only this generic page is cached. Authenticated HTML, API responses, and
// mutations always use the network. Bump the version when offline.html changes.
const CACHE = "workspace-offline-v1";
const OFFLINE_URL = "/offline.html";

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(CACHE).then((cache) => cache.add(new Request(OFFLINE_URL, { cache: "reload" }))),
  );
});

self.addEventListener("activate", (event) => {
  event.waitUntil(
    (async () => {
      const keys = await caches.keys();
      await Promise.all(
        keys
          .filter((key) => key.startsWith("workspace-offline-") && key !== CACHE)
          .map((key) => caches.delete(key)),
      );
      await self.clients.claim();
    })(),
  );
});

self.addEventListener("fetch", (event) => {
  const { request } = event;
  const url = new URL(request.url);
  if (
    request.method !== "GET" ||
    request.mode !== "navigate" ||
    url.origin !== self.location.origin ||
    url.pathname.startsWith("/api/") ||
    url.pathname.startsWith("/_serverFn/") ||
    url.pathname.startsWith("/oauth/") ||
    url.pathname === "/mcp" ||
    url.pathname === "/health"
  ) {
    return;
  }
  event.respondWith(
    fetch(request).catch(async () => {
      const cache = await caches.open(CACHE);
      return (await cache.match(OFFLINE_URL)) ?? Response.error();
    }),
  );
});