const CACHE_NAME = "video-hotness-mobile-offline-v1";
const APP_SHELL = [
  "/mobile.html",
  "/mobile.css",
  "/mobile.js",
  "/manifest.webmanifest",
];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => cache.addAll(APP_SHELL)),
  );
  self.skipWaiting();
});

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

  if (url.pathname === "/" || APP_SHELL.includes(url.pathname)) {
    event.respondWith(cacheFirst(request));
    return;
  }

  if (url.pathname.startsWith("/api/")) {
    event.respondWith(fetch(request));
  }
});

async function cacheFirst(request) {
  const cached = await caches.match(request);
  if (cached) return cached;
  try {
    const response = await fetch(request);
    const cache = await caches.open(CACHE_NAME);
    cache.put(request, response.clone());
    return response;
  } catch {
    return caches.match("/mobile.html");
  }
}