// Everclone PWA Service Worker (v2.0.0)
const CACHE_NAME = 'everclone-cache-v3';
const STATIC_ASSETS = [
  '/',
  '/manifest.json',
  '/icon-192.png',
  '/icon-512.png',
  '/icon-maskable-192.png',
  '/icon-maskable-512.png',
  '/apple-touch-icon.png',
  '/icon.svg'
];

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

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

self.addEventListener('fetch', (event) => {
  // CRITICAL: Never intercept POST/PUT/DELETE requests!
  if (event.request.method !== 'GET') {
    return;
  }

  const url = new URL(event.request.url);

  // Bypass API endpoints and share endpoint
  if (url.pathname.startsWith('/api/') || url.pathname.startsWith('/share')) {
    return;
  }

  // For page navigations (including share target queries like /?url=... or /?noteId=...)
  if (event.request.mode === 'navigate') {
    event.respondWith(
      fetch(event.request).catch(() => {
        return caches.match('/');
      })
    );
    return;
  }

  // Stale-while-revalidate for static assets
  event.respondWith(
    caches.match(event.request).then((cachedResponse) => {
      const fetchPromise = fetch(event.request)
        .then((networkResponse) => {
          if (
            networkResponse &&
            networkResponse.status === 200 &&
            (url.pathname === '/' || url.pathname.startsWith('/_next/static/'))
          ) {
            const responseClone = networkResponse.clone();
            caches.open(CACHE_NAME).then((cache) => {
              cache.put(event.request, responseClone);
            });
          }
          return networkResponse;
        })
        .catch(() => cachedResponse);

      return cachedResponse || fetchPromise;
    })
  );
});