const CACHE_NAME = 'erdbeerkasse-v1';
const ASSETS_TO_CACHE = [
  '/',
  '/manifest.json',
  '/static/icon-192x192.png',
  '/static/icon-512x512.png',
  'https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css'
];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then((cache) => cache.addAll(ASSETS_TO_CACHE))
      .then(() => self.skipWaiting())
  );
});

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheName !== CACHE_NAME) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
  self.clients.claim();
});

// Network-first strategy for dynamic instances, fallback to cache
self.addEventListener('fetch', (event) => {
  if (event.request.method !== 'GET') {
    return;
  }
  
  event.respondWith(
    fetch(event.request)
      .then((response) => {
        // Clone the response before caching if it's a valid response
        if (!response || response.status !== 200 || response.type !== 'basic') {
          return response;
        }
        
        const responseToCache = response.clone();
        caches.open(CACHE_NAME).then((cache) => {
          cache.put(event.request, responseToCache);
        });
        
        return response;
      })
      .catch(() => caches.match(event.request))
  );
});