const CACHE_NAME = 'bakery-ai-v2.0.0';
const urlsToCache = [
  '/',
  '/index.html',
  '/manifest.json',
  '/manifest.webmanifest',
  '/favicon.ico',
];

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

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

// Fetch event - serve from cache, fallback to network
self.addEventListener('fetch', (event) => {
  // Skip cross-origin requests
  if (!event.request.url.startsWith(self.location.origin)) {
    return;
  }

  // API calls - network first, cache fallback
  if (event.request.url.includes('/api/')) {
    event.respondWith(
      fetch(event.request)
        .then((response) => {
          // Clone the response before caching
          const responseToCache = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(event.request, responseToCache);
          });
          return response;
        })
        .catch(() => {
          return caches.match(event.request);
        })
    );
    return;
  }

  // Static assets - network first, cache fallback (for versioned assets)
  if (event.request.destination === 'script' || event.request.destination === 'style' || event.request.destination === 'image') {
    event.respondWith(
      fetch(event.request).then((response) => {
        // Clone the response before caching
        const responseToCache = response.clone();
        caches.open(CACHE_NAME).then((cache) => {
          cache.put(event.request, responseToCache);
        });
        return response;
      }).catch(() => {
        return caches.match(event.request);
      })
    );
  } else {
    // Other requests - cache first, network fallback
    event.respondWith(
      caches.match(event.request).then((response) => {
        return response || fetch(event.request);
      })
    );
  }
});

// Background sync for offline actions
self.addEventListener('sync', (event) => {
  if (event.tag === 'sync-inventory') {
    event.waitUntil(syncInventoryData());
  }
});

// Push notifications
self.addEventListener('push', (event) => {
  const options = {
    body: event.data ? event.data.text() : 'Nueva notificación de Bakery AI',
    icon: '/icons/icon-192.png',
    badge: '/icons/badge-72.png',
    vibrate: [100, 50, 100],
    data: {
      dateOfArrival: Date.now(),
      primaryKey: 1,
    },
  };

  event.waitUntil(
    self.registration.showNotification('Bakery AI', options)
  );
});

// Notification click handler
self.addEventListener('notificationclick', (event) => {
  event.notification.close();
  event.waitUntil(
    clients.openWindow('/')
  );
});

// Helper function for background sync
async function syncInventoryData() {
  try {
    const cache = await caches.open(CACHE_NAME);
    const requests = await cache.keys();
    
    const pendingRequests = requests.filter(
      req => req.url.includes('/api/') && req.method === 'POST'
    );

    for (const request of pendingRequests) {
      try {
        await fetch(request);
        await cache.delete(request);
      } catch (error) {
        console.error('Failed to sync:', error);
      }
    }
  } catch (error) {
    console.error('Sync failed:', error);
  }
}