const CACHE_NAME = 'pulse-v1';
const ASSETS = [
  '/',
  '/index.php',
  '/assets/css/custom.css',
  '/assets/js/main.js',
  'https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css',
  'https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js',
  'https://cdn.jsdelivr.net/npm/chart.js'
];

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

self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request).then(response => {
      return response || fetch(event.request);
    })
  );
});