// Nom du cache
const CACHE_NAME = 'mariam-ai-cache-v1';

// Ressources à mettre en cache
const CACHE_ASSETS = [
  '/',
  '/static/css/style.css',
  '/static/js/chat.js',
  '/static/icons/icon-192x192.png',
  '/static/icons/icon-512x512.png',
  '/static/manifest.json'
];

// Installation du Service Worker
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then((cache) => {
        return cache.addAll(CACHE_ASSETS);
      })
      .then(() => self.skipWaiting())
  );
});

// Activation du Service Worker
self.addEventListener('activate', (event) => {
  const currentCaches = [CACHE_NAME];
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return cacheNames.filter((cacheName) => !currentCaches.includes(cacheName));
    }).then((cachesToDelete) => {
      return Promise.all(cachesToDelete.map((cacheToDelete) => {
        return caches.delete(cacheToDelete);
      }));
    }).then(() => self.clients.claim())
  );
});

// Stratégie de cache : "Cache, falling back to network"
self.addEventListener('fetch', (event) => {
  // Ne pas mettre en cache les requêtes API
  if (event.request.url.includes('/api/')) {
    return;
  }
  
  event.respondWith(
    caches.match(event.request)
      .then((response) => {
        // Cache hit - return response
        if (response) {
          return response;
        }
        
        // Si pas dans le cache, on fait la requête au réseau
        return fetch(event.request).then(
          (response) => {
            // Return the network response
            if(!response || response.status !== 200 || response.type !== 'basic') {
              return response;
            }
            
            // On clone la réponse pour l'utiliser deux fois
            const responseToCache = response.clone();
            
            caches.open(CACHE_NAME)
              .then((cache) => {
                cache.put(event.request, responseToCache);
              });
            
            return response;
          }
        );
      })
  );
});