sw.js

const CACHE_NAME = 'chetana-v1';
const ASSETS = [
  '/chetana/',
  '/chetana/index.html',
  '/chetana/try.html',
  '/chetana/manifest.json'
];

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

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

self.addEventListener('fetch', event => {
  // Network-first for API calls, cache-first for static assets
  if (event.request.url.includes('api.anthropic') ||
      event.request.url.includes('api.openai') ||
      event.request.url.includes('generativelanguage.googleapis')) {
    return; // Don't cache API calls
  }
  event.respondWith(
    caches.match(event.request).then(cached => {
      const fetched = fetch(event.request).then(response => {
        if (response.ok) {
          const clone = response.clone();
          caches.open(CACHE_NAME).then(cache => cache.put(event.request, clone));
        }
        return response;
      }).catch(() => cached);
      return cached || fetched;
    })
  );
});