// Service Worker for Gitea Mobile PWA
// Caches the app shell for offline/fast loading.

const CACHE_NAME = 'gitea-mobile-v2';
const APP_SHELL = [
  '/',
  '/static/style.css',
  '/static/manifest.json',
  '/static/icon-192.png',
  '/static/icon-512.png',
  '/static/htmx.min.js'
];

// Install: cache app shell resources.
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      return cache.addAll(APP_SHELL);
    })
  );
  // Activate immediately.
  self.skipWaiting();
});

// Activate: clean up old caches.
self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames
          .filter((name) => name !== CACHE_NAME)
          .map((name) => caches.delete(name))
      );
    })
  );
  // Take control of all clients immediately.
  self.clients.claim();
});

// Fetch: network-first for API/HTML, cache-first for static assets.
self.addEventListener('fetch', (event) => {
  const url = new URL(event.request.url);

  // Cache-first for static assets.
  if (url.pathname.startsWith('/static/')) {
    event.respondWith(
      caches.match(event.request).then((cached) => {
        return cached || fetch(event.request).then((response) => {
          // Cache the fetched response for next time.
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(event.request, responseClone);
          });
          return response;
        });
      })
    );
    return;
  }

  // Network-first for HTML/API requests.
  if (event.request.headers.get('accept')?.includes('text/html') ||
      event.request.headers.get('HX-Request')) {
    event.respondWith(
      fetch(event.request)
        .then((response) => {
          // Cache successful GET responses.
          if (event.request.method === 'GET' && response.ok) {
            const responseClone = response.clone();
            caches.open(CACHE_NAME).then((cache) => {
              cache.put(event.request, responseClone);
            });
          }
          return response;
        })
        .catch(() => {
          // Fallback to cache if network fails.
          return caches.match(event.request);
        })
    );
    return;
  }

  // Default: network only.
  event.respondWith(fetch(event.request));
});