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

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

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

// Fetch event - serve from cache, fallback to network
self.addEventListener('fetch', (event) => {
  // API requests - always fetch from network, don't cache
  if (event.request.url.includes('/api/')) {
    event.respondWith(fetch(event.request));
    return;
  }

  // Static assets - cache first, then network
  event.respondWith(
    caches.match(event.request)
      .then((response) => {
        // Return cached version or fetch from network
        return response || fetch(event.request).then((response) => {
          // Don't cache non-successful responses
          if (!response || response.status !== 200 || response.type !== 'basic') {
            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, return offline page if available
        if (event.request.destination === 'document') {
          return caches.match('/index.html');
        }
      })
  );
});