/* Foodlinkk PWA service worker v6 */
const CACHE = 'foodlinkk-shell-v6';
const PRECACHE = [
  '/',
  '/static/manifest.json',
  '/static/css/mobile.css?v=6',
  '/static/css/app-sidebar-neo.css?v=12',
  '/static/css/palantir-theme.css?v=4',
  '/static/icons/icon-192.png',
  '/static/icons/icon-512.png',
  '/static/icons/apple-touch-icon.png',
];

self.addEventListener('install', (event) => {
  self.skipWaiting();
  event.waitUntil(
    caches.open(CACHE).then((cache) => cache.addAll(PRECACHE).catch(() => undefined))
  );
});

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((keys) =>
      Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k)))
    ).then(() => self.clients.claim())
  );
});

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

  // API / live data: always network
  if (url.pathname.startsWith('/api') || url.pathname.includes('/ws')) return;

  // Navigations: network-first, fallback to cache
  if (req.mode === 'navigate') {
    event.respondWith(
      fetch(req)
        .then((res) => {
          const copy = res.clone();
          caches.open(CACHE).then((c) => c.put('/', copy)).catch(() => undefined);
          return res;
        })
        .catch(() => caches.match('/') || caches.match(req))
    );
    return;
  }

  // Static assets: stale-while-revalidate
  if (url.pathname.startsWith('/static/')) {
    event.respondWith(
      caches.match(req).then((cached) => {
        const net = fetch(req)
          .then((res) => {
            if (res && res.ok) {
              const copy = res.clone();
              caches.open(CACHE).then((c) => c.put(req, copy)).catch(() => undefined);
            }
            return res;
          })
          .catch(() => cached);
        return cached || net;
      })
    );
  }
});