// Pacific Trans GO - Service Worker PWA
const CACHE_NAME = 'pacifictrans-go-v1';
const STATIC_ASSETS = [
  '/',
  '/index.html',
  '/css/style.css',
  '/js/app.js',
  '/manifest.json',
  '/icons/icon-192.png',
  '/icons/icon-512.png',
  '/icons/apple-touch-icon.png',
  '/images/hero-banner.jpg'
];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      console.log('⚡ [PWA] Pre-caching static assets');
      return cache.addAll(STATIC_ASSETS).catch((err) => {
        console.warn('⚠️ [PWA Pre-cache error]:', err);
      });
    })
  );
  self.skipWaiting();
});

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

self.addEventListener('fetch', (event) => {
  // Don't intercept API or non-GET requests
  if (event.request.method !== 'GET' || event.request.url.includes('/api/')) {
    return;
  }

  event.respondWith(
    caches.match(event.request).then((cachedResponse) => {
      if (cachedResponse) {
        // Fetch background update for cache
        fetch(event.request).then((networkResponse) => {
          if (networkResponse && networkResponse.status === 200) {
            caches.open(CACHE_NAME).then((cache) => cache.put(event.request, networkResponse));
          }
        }).catch(() => {});
        return cachedResponse;
      }
      return fetch(event.request);
    })
  );
});