// Minimal service worker for Guest PWA queue sync
self.addEventListener('install', (event) => {
  self.skipWaiting();
});

self.addEventListener('activate', (event) => {
  event.waitUntil(self.clients.claim());
});

const ASSETS_CACHE = 'guest-assets-v1';
const IMAGES_CACHE = 'guest-images-v1';

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

  const url = new URL(req.url);
  // Only handle same-origin requests
  if (url.origin !== self.location.origin) return;

  // Never cache API calls; let them hit network directly
  if (url.pathname.startsWith('/api/')) return;

  // Cache-first for images
  if (req.destination === 'image' || /\.(png|jpg|jpeg|webp|avif|gif|svg)(\?.*)?$/i.test(url.pathname)) {
    event.respondWith((async () => {
      const cache = await caches.open(IMAGES_CACHE);
      const cached = await cache.match(req);
      if (cached) return cached;
      try {
        const res = await fetch(req, { credentials: 'same-origin' });
        if (res.ok) cache.put(req, res.clone());
        return res;
      } catch (e) {
        return cached || Response.error();
      }
    })());
    return;
  }

  // Stale-while-revalidate for CSS/JS assets
  if (req.destination === 'style' || req.destination === 'script') {
    event.respondWith((async () => {
      const cache = await caches.open(ASSETS_CACHE);
      const cached = await cache.match(req);
      const networkPromise = fetch(req, { credentials: 'same-origin' })
        .then((res) => {
          if (res.ok) cache.put(req, res.clone());
          return res;
        })
        .catch(() => null);
      return cached || (await networkPromise) || Response.error();
    })());
    return;
  }
});

self.addEventListener('sync', (event) => {
  if (event.tag === 'upload-queue') {
    event.waitUntil(
      (async () => {
        const clients = await self.clients.matchAll({ includeUncontrolled: true, type: 'window' });
        for (const client of clients) {
          client.postMessage({ type: 'sync-queue' });
        }
      })()
    );
  }
});