const cacheName = "xiteng-portal-v8";
const appShell = [
  "/",
  "/styles.css",
  "/app.js?v=7",
  "/manifest.webmanifest",
  "/favicon.svg",
  "/favicon.ico",
  "/icons/favicon-32.png",
  "/icons/apple-touch-icon.png",
  "/icons/icon-192.png",
  "/icons/icon-512.png",
  "/icons/icon-maskable-512.png"
];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(cacheName)
      .then((cache) => cache.addAll(appShell))
      .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;
  const url = new URL(request.url);

  if (request.method !== "GET" || url.origin !== self.location.origin) {
    return;
  }

  if (url.pathname.startsWith("/api/")) {
    event.respondWith(
      fetch(request).catch(() => new Response(
        JSON.stringify({error: "Network unavailable"}),
        {
          status: 503,
          headers: {
            "Cache-Control": "no-store",
            "Content-Type": "application/json; charset=utf-8"
          }
        }
      ))
    );
    return;
  }

  if (url.pathname.startsWith("/admin")
    || url.pathname.startsWith("/account")
    || url.pathname === "/admin.js"
    || url.pathname === "/account.js"
    || url.pathname.startsWith("/oauth2/")
    || url.pathname.startsWith("/outpost.goauthentik.io/")) {
    event.respondWith(fetch(request));
    return;
  }

  if (request.mode === "navigate") {
    event.respondWith(
      fetch(request)
        .then((response) => {
          if (response.ok && ["/", "/index.html"].includes(url.pathname)) {
            const copy = response.clone();
            caches.open(cacheName).then((cache) => cache.put("/", copy));
          }
          return response;
        })
        .catch(() => caches.match("/"))
    );
    return;
  }

  event.respondWith(
    caches.match(request).then((cached) => {
      const network = fetch(request).then((response) => {
        if (response.ok) {
          const copy = response.clone();
          caches.open(cacheName).then((cache) => cache.put(request, copy));
        }
        return response;
      });
      if (cached) {
        network.catch(() => undefined);
        return cached;
      }
      return network;
    })
  );
});