/* Offline shell: navigations are network-first, static assets cache-first. */
const CACHE = "homelab-shell-v3";

self.addEventListener("install", (e) => {
  e.waitUntil(caches.open(CACHE).then((c) => c.addAll(["/", "/index.html"])));
  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()),
  );
});

self.addEventListener("fetch", (e) => {
  if (e.request.method !== "GET") return; // RPC = POST, always network

  // Navigations: network-first, cached shell on failure.
  if (e.request.mode === "navigate") {
    e.respondWith(fetch(e.request).catch(() => caches.match("/index.html")));
    return;
  }

  // Same-origin assets (hashed filenames): cache-first, backfill cache on success.
  const url = new URL(e.request.url);
  if (url.origin === location.origin && (url.pathname.startsWith("/assets/") || url.pathname === "/manifest.webmanifest" || url.pathname.startsWith("/icon"))) {
    e.respondWith(
      caches.match(e.request).then(
        (hit) =>
          hit ||
          fetch(e.request).then((resp) => {
            const copy = resp.clone();
            caches.open(CACHE).then((c) => c.put(e.request, copy));
            return resp;
          }),
      ),
    );
  }
});