/**
 * 天工智能体平台 — Service Worker
 *
 * - 离线缓存：静态资源 + API 响应
 * - 推送通知
 * - 安装后激活
 */
const CACHE_NAME = 'aiagent-v1.0.0';
const RUNTIME_CACHE = 'aiagent-runtime';

const PRECACHE_URLS = [
  '/',
  '/index.html',
  '/manifest.json',
];

// ─── Install: 预缓存关键资源 ───────────────────────────────────
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      return cache.addAll(PRECACHE_URLS);
    }).then(() => self.skipWaiting())
  );
});

// ─── Activate: 清理旧缓存 ──────────────────────────────────────
self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((names) => {
      return Promise.all(
        names
          .filter((n) => n !== CACHE_NAME && n !== RUNTIME_CACHE)
          .map((n) => caches.delete(n))
      );
    }).then(() => self.clients.claim())
  );
});

// ─── Fetch: 网络优先 + 缓存回退 ────────────────────────────────
self.addEventListener('fetch', (event) => {
  const { request } = event;
  if (request.method !== 'GET') return;

  // API 请求：网络优先
  if (request.url.includes('/api/')) {
    event.respondWith(
      fetch(request)
        .then((response) => {
          const clone = response.clone();
          caches.open(RUNTIME_CACHE).then((cache) => {
            cache.put(request, clone);
          });
          return response;
        })
        .catch(() => caches.match(request))
    );
    return;
  }

  // 静态资源：缓存优先
  event.respondWith(
    caches.match(request).then((cached) => {
      const fetched = fetch(request).then((response) => {
        const clone = response.clone();
        caches.open(RUNTIME_CACHE).then((cache) => {
          cache.put(request, clone);
        });
        return response;
      });
      return cached || fetched;
    })
  );
});

// ─── Push: 浏览器推送通知 ──────────────────────────────────────
self.addEventListener('push', (event) => {
  if (!event.data) return;

  const data = event.data.json().catch(() => ({ title: '天工智能体', body: event.data.text() }));
  const options = {
    body: data.body || '',
    icon: '/icons/icon-192.png',
    badge: '/icons/icon-192.png',
    data: data.data || {},
    vibrate: [200, 100, 200],
    requireInteraction: data.requireInteraction || false,
  };

  event.waitUntil(
    self.registration.showNotification(data.title || '天工智能体', options)
  );
});

// ─── Notification Click ─────────────────────────────────────────
self.addEventListener('notificationclick', (event) => {
  event.notification.close();
  const url = event.notification.data?.url || '/';
  event.waitUntil(
    self.clients.matchAll({ type: 'window' }).then((clients) => {
      for (const client of clients) {
        if (client.url.includes(url) && 'focus' in client) {
          return client.focus();
        }
      }
      return self.clients.openWindow(url);
    })
  );
});