const CACHE_NAME = 'camila-ai-v1';
const urlsToCache = [
  '/',
  '/index.html',
  '/style.css',
  '/app.js',
  '/manifest.json',
  '/icon-192.png',
  '/icon-512.png'
];

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

// Activate event - clean old caches
self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheName !== CACHE_NAME) {
            console.log('Camila AI: Deleting old cache:', cacheName);
            return caches.delete(cacheName);
          }
        })
      );
    }).then(() => self.clients.claim())
  );
});

// Fetch event - serve from cache, fallback to network
self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request)
      .then((response) => {
        if (response) {
          return response;
        }
        return fetch(event.request).then((response) => {
          // Don't cache non-successful responses or non-GET requests
          if (!response || response.status !== 200 || event.request.method !== 'GET') {
            return response;
          }
          // Clone the response
          const responseToCache = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(event.request, responseToCache);
          });
          return response;
        });
      })
      .catch(() => {
        // If both cache and network fail, show offline page for HTML requests
        if (event.request.headers.get('accept').includes('text/html')) {
          return caches.match('/');
        }
      })
  );
});