const CACHE_NAME = "paperclip-v1";
const STATIC_ASSETS = ["/", "/favicon.ico", "/favicon.svg"];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => cache.addAll(STATIC_ASSETS))
  );
  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))
      )
    )
  );
  self.clients.claim();
});

self.addEventListener("fetch", (event) => {
  const { request } = event;
  const url = new URL(request.url);

  // Skip non-GET requests and API calls
  if (request.method !== "GET" || url.pathname.startsWith("/api")) {
    return;
  }

  // Network-first for navigation requests (SPA)
  if (request.mode === "navigate") {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const clone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
          return response;
        })
        .catch(() => caches.match("/"))
    );
    return;
  }

  // Cache-first for static assets
  event.respondWith(
    caches.match(request).then((cached) => {
      if (cached) return cached;
      return fetch(request).then((response) => {
        if (response.ok && url.origin === self.location.origin) {
          const clone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
        }
        return response;
      });
    })
  );
});