const cacheName = "xiteng-chat-shell-v4";
const shellAssets = [
  "/",
  "/manifest.webmanifest",
  "/favicon.svg",
  "/icons/icon-192.png",
  "/icons/icon-512.png",
  "/icons/icon-maskable-512.png",
  "/icons/apple-touch-icon.png"
];

self.addEventListener("install", (event) => {
  event.waitUntil(caches.open(cacheName).then(async (cache) => {
    for (const asset of shellAssets) {
      try {
        const response = await fetch(asset, {cache: "reload"});
        if (response.ok) await cache.put(asset, response);
      } catch {}
    }
  }).then(() => self.skipWaiting()));
});

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

self.addEventListener("fetch", (event) => {
  const request = event.request;
  if (request.method !== "GET") return;
  const url = new URL(request.url);
  if (url.origin !== self.location.origin || url.pathname.startsWith("/api/") || url.pathname.startsWith("/outpost.goauthentik.io/")) return;

  if (request.mode === "navigate") {
    event.respondWith(fetch(request).then((response) => {
      if (response.ok) caches.open(cacheName).then((cache) => cache.put("/", response.clone()));
      return response;
    }).catch(async () => (await caches.match("/")) || Response.error()));
    return;
  }

  if (shellAssets.includes(url.pathname) || /\.(?:js|css|png|svg|ico|webmanifest)$/.test(url.pathname)) {
    event.respondWith(caches.match(request).then((cached) => cached || fetch(request).then((response) => {
      if (response.ok) caches.open(cacheName).then((cache) => cache.put(request, response.clone()));
      return response;
    })));
  }
});