// Minimal service worker for Mila PWA with instant cache-bypassing navigation
const CACHE_NAME = 'mila-pwa-v5';

self.addEventListener('install', (event) => {
  self.skipWaiting();
});

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

self.addEventListener('fetch', (event) => {
  if (event.request.method !== 'GET') return;

  // For HTML documents/navigations: ALWAYS bypass HTTP cache to get latest live server rendering
  if (event.request.destination === 'document' || event.request.mode === 'navigate') {
    event.respondWith(
      fetch(event.request, { cache: 'no-cache' })
        .then((response) => {
          if (response && response.status === 200) {
            const clone = response.clone();
            caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
          }
          return response;
        })
        .catch(() => caches.match(event.request))
    );
    return;
  }

  // Assets (images, fonts, scripts): network-first with offline cache fallback
  event.respondWith(
    fetch(event.request)
      .then((response) => {
        if (response && response.status === 200) {
          const clone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
        }
        return response;
      })
      .catch(() => caches.match(event.request))
  );
});