sw.js

const CACHE_NAME = 'cleds-v14';
const ASSETS = [
  '/',
  '/index.html',
  '/manifest.json',
  '/icon.svg'
];

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

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

self.addEventListener('fetch', event => {
  // API endpoints should never be cached
  if (event.request.url.includes('/api/')) {
    event.respondWith(fetch(event.request));
    return;
  }
  
  // Main page should be Network-First to ensure updates are served immediately when online
  const url = new URL(event.request.url);
  if (url.pathname === '/' || url.pathname === '/index.html') {
    event.respondWith(
      fetch(event.request)
        .then(networkResponse => {
          if (networkResponse.status === 200) {
            const responseClone = networkResponse.clone();
            caches.open(CACHE_NAME).then(cache => cache.put(event.request, responseClone));
          }
          return networkResponse;
        })
        .catch(() => {
          return caches.match(event.request);
        })
    );
    return;
  }

  // Other assets can use Stale-While-Revalidate
  event.respondWith(
    caches.match(event.request)
      .then(cachedResponse => {
        if (cachedResponse) {
          fetch(event.request).then(networkResponse => {
            if (networkResponse.status === 200) {
              caches.open(CACHE_NAME).then(cache => cache.put(event.request, networkResponse));
            }
          }).catch(() => {});
          return cachedResponse;
        }
        return fetch(event.request);
      })
  );
});