const CACHE = "diabetix-v1";
const APP_SHELL = ["/", "/saisie", "/historique", "/manifest.webmanifest", "/icon.svg"];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(CACHE).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).map((k) => caches.delete(k)))
    )
  );
  self.clients.claim();
});

self.addEventListener("fetch", (event) => {
  const { request } = event;
  if (request.method !== "GET") return;

  const url = new URL(request.url);
  if (url.origin !== self.location.origin) return;

  // Network-first for HTML and API, cache fallback
  if (request.mode === "navigate" || url.pathname.startsWith("/api/")) {
    event.respondWith(
      fetch(request)
        .then((res) => {
          const copy = res.clone();
          caches.open(CACHE).then((c) => c.put(request, copy)).catch(() => {});
          return res;
        })
        .catch(() => caches.match(request).then((m) => m || caches.match("/")))
    );
    return;
  }

  // Cache-first for static assets
  event.respondWith(
    caches.match(request).then((cached) => {
      if (cached) return cached;
      return fetch(request).then((res) => {
        const copy = res.clone();
        caches.open(CACHE).then((c) => c.put(request, copy)).catch(() => {});
        return res;
      });
    })
  );
});
