// advanced-worker.js
export default {
  async fetch(request) {
    const testURLs = [
      'https://vl.61999.icu/ray',
      'https://104.16.0.1/ray',
      'https://108.162.194.1/ray'
    ];

    // 为当前客户端测试各个节点的速度
    const results = await Promise.all(
      testURLs.map(async (url) => {
        const start = Date.now();
        try {
          await fetch(url, { 
            method: 'HEAD',
            headers: { 'Host': 'vl.61999.icu' }
          });
          return { url, latency: Date.now() - start };
        } catch {
          return { url, latency: 9999 };
        }
      })
    );

    // 选择延迟最低的节点
    const bestNode = results.reduce((best, current) => 
      current.latency < best.latency ? current : best
    );

    // 提取IP地址
    const bestIP = bestNode.url.replace('https://', '').split('/')[0];
    
    return Response.redirect(`https://${bestIP}`, 307);
  }
}