/* Simple offline-capable shell for nomadro PWA */
const CACHE = "nomadro-shell-v1";
const PRECACHE = ["/", "/plan", "/compare", "/tools", "/manifest.webmanifest", "/icons/icon.svg"];

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

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

self.addEventListener("fetch", (event) => {
  const req = event.request;
  if (req.method !== "GET") return;
  const url = new URL(req.url);
  if (url.origin !== self.location.origin) return;

  // API: network only
  if (url.pathname.startsWith("/api/")) return;

  // Navigations: network first, fall back to cache / home
  if (req.mode === "navigate") {
    event.respondWith(
      fetch(req)
        .then((res) => {
          const copy = res.clone();
          caches.open(CACHE).then((c) => c.put(req, copy));
          return res;
        })
        .catch(() => caches.match(req).then((r) => r || caches.match("/")))
    );
    return;
  }

  // Static assets: cache first
  event.respondWith(
    caches.match(req).then(
      (cached) =>
        cached ||
        fetch(req).then((res) => {
          if (res.ok && (url.pathname.startsWith("/_next/") || url.pathname.startsWith("/icons/"))) {
            const copy = res.clone();
            caches.open(CACHE).then((c) => c.put(req, copy));
          }
          return res;
        })
    )
  );
});