const CACHE_NAME = "pi-car-companion-v2";
const APP_SHELL = [
  "/",
  "/manifest.webmanifest",
  "/icon.svg",
  "/pwa-192x192.png",
  "/pwa-512x512.png",
  "/pwa-maskable-512x512.png",
  "/apple-touch-icon.png"
];

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

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

  const url = new URL(request.url);
  if (url.origin !== self.location.origin || url.pathname.startsWith("/api/") || url.pathname === "/healthz") return;

  if (request.mode === "navigate") {
    event.respondWith(
      fetch(request)
        .then((response) => {
          if (response.ok) {
            const copy = response.clone();
            event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.put("/", copy)));
          }
          return response;
        })
        .catch(() => caches.match("/"))
    );
    return;
  }

  if (url.pathname.startsWith("/assets/") || APP_SHELL.includes(url.pathname)) {
    event.respondWith(
      caches.match(request).then(
        (cached) =>
          cached ??
          fetch(request).then((response) => {
            if (response.ok) {
              const copy = response.clone();
              event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.put(request, copy)));
            }
            return response;
          })
      )
    );
  }
});