// Service Worker 注册与生命周期管理

export async function registerServiceWorker(): Promise<ServiceWorkerRegistration | null> {
  if (!('serviceWorker' in navigator)) {
    console.warn('Service Worker 不支持');
    return null;
  }

  try {
    const registration = await navigator.serviceWorker.register('/sw.js', {
      scope: '/',
    });

    console.log('SW 注册成功:', registration.scope);

    // 检查更新
    registration.addEventListener('updatefound', () => {
      const newWorker = registration.installing;
      if (newWorker) {
        newWorker.addEventListener('statechange', () => {
          if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
            // 新版本可用，通知用户刷新
            console.log('新版本 Service Worker 可用');
          }
        });
      }
    });

    return registration;
  } catch (error) {
    console.error('SW 注册失败:', error);
    return null;
  }
}

export async function unregisterServiceWorker(): Promise<boolean> {
  if (!('serviceWorker' in navigator)) return false;

  try {
    const registration = await navigator.serviceWorker.ready;
    return registration.unregister();
  } catch (error) {
    console.error('SW 注销失败:', error);
    return false;
  }
}

export async function startPeriodicSync(): Promise<void> {
  // 发送消息启动定时检查
  if (navigator.serviceWorker.controller) {
    navigator.serviceWorker.controller.postMessage({ type: 'START_CHECK' });
  }
}

export async function stopPeriodicSync(): Promise<void> {
  // 发送消息停止定时检查
  if (navigator.serviceWorker.controller) {
    navigator.serviceWorker.controller.postMessage({ type: 'STOP_CHECK' });
  }
}

export async function sendEventsToSW(events: any[]): Promise<void> {
  if (!navigator.serviceWorker.controller) return;

  navigator.serviceWorker.controller.postMessage({
    type: 'UPDATE_EVENTS',
    events,
  });
}

export async function skipWaiting(): Promise<void> {
  const registration = await navigator.serviceWorker.getRegistration();
  if (registration?.waiting) {
    registration.waiting.postMessage({ type: 'SKIP_WAITING' });
  }
}