const CACHE = "todo-v1";
const PRECACHE = ["/manifest.json", "/icons/icon-192.png", "/icons/icon-512.png"];

self.addEventListener("install", (e) => {
  e.waitUntil(caches.open(CACHE).then((c) => c.addAll(PRECACHE)));
  self.skipWaiting();
});

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

self.addEventListener("fetch", (e) => {
  const url = new URL(e.request.url);
  if (url.pathname.startsWith("/icons/") || url.pathname === "/manifest.json") {
    e.respondWith(caches.match(e.request).then((r) => r || fetch(e.request)));
    return;
  }
  // Network-first for everything else (SSR pages, API)
  e.respondWith(
    fetch(e.request).catch(() => caches.match(e.request))
  );
});