// Beep Graph service worker — minimal cache-first for app shell
const CACHE_NAME = "beepgraph-v1";
const APP_SHELL = ["/", "/index.html"];

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((k) => k !== CACHE_NAME).map((k) => caches.delete(k)))
    )
  );
  self.clients.claim();
});

self.addEventListener("fetch", (event) => {
  // Only cache GET requests for same-origin navigation/assets
  if (event.request.method !== "GET") return;
  const url = new URL(event.request.url);
  if (url.origin !== self.location.origin) return;

  // Network-first for HTML (always get fresh app), cache-first for assets
  if (event.request.mode === "navigate") {
    event.respondWith(
      fetch(event.request).catch(() => caches.match("/index.html"))
    );
  } else {
    event.respondWith(
      caches.match(event.request).then((cached) => cached || fetch(event.request))
    );
  }
});