const CACHE_NAME = 'aitbc-v1';
const urlsToCache = [
  '/',
  '/index.html',
  '/assets/css/main.css',
  '/assets/css/font-awesome.min.css',
  '/assets/js/main.js',
  '/favicon.ico',
  '/explorer/',
  '/marketplace/',
  '/docs/'
];

// Install event - cache assets
self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => {
        console.log('Caching assets...');
        return cache.addAll(urlsToCache);
      })
      .catch(err => console.log('Cache failed:', err))
  );
  self.skipWaiting();
});

// Fetch event - serve from cache or network
self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request)
      .then(response => {
        // Return cached version or fetch from network
        if (response) {
          return response;
        }
        return fetch(event.request)
          .then(networkResponse => {
            // Cache successful network responses
            if (networkResponse && networkResponse.status === 200) {
              const clonedResponse = networkResponse.clone();
              caches.open(CACHE_NAME).then(cache => {
                cache.put(event.request, clonedResponse);
              });
            }
            return networkResponse;
          })
          .catch(() => {
            // Return offline fallback for HTML requests
            if (event.request.mode === 'navigate') {
              return caches.match('/index.html');
            }
          });
      })
  );
});

// Activate event - clean up old caches
self.addEventListener('activate', event => {
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return Promise.all(
        cacheNames
          .filter(name => name !== CACHE_NAME)
          .map(name => caches.delete(name))
      );
    })
  );
  self.clients.claim();
});