const CACHE_NAME = "deldel-cache-v1";
const APP_SHELL = ["/", "/manifest.webmanifest", "/icons/icon-192.png", "/icons/icon-512.png"];

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

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

// استراتژی: برای API همیشه شبکه (never cache)، برای بقیه network-first با fallback به کش
self.addEventListener("fetch", (event) => {
  const url = new URL(event.request.url);

  if (event.request.method !== "GET") return;
  if (!url.protocol.startsWith("http")) return;
  if (url.pathname.startsWith("/api")) return;

  event.respondWith(
    fetch(event.request)
      .then((res) => {
        const resClone = res.clone();
        caches.open(CACHE_NAME).then((cache) => cache.put(event.request, resClone).catch(() => {}));
        return res;
      })
      .catch(() => caches.match(event.request))
  );
});