const CACHE_NAME = 'costguard-cache-v1';
const urlsToCache = [
  '/static/billing-dashboard.html',
  '/static/command-hub.html',
  'https://fonts.googleapis.com/css2?family=Inter:wght@300..700&family=JetBrains+Mono:wght@400;600&display=swap',
  'https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.min.js'
];

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

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