const http = require('http');

const BACKEND_HEALTH_URL = 'http://192.168.110.64:8084/actuator/health';
const MAX_RETRIES = 5;
const RETRY_INTERVAL_MS = 3000;

function checkBackendHealth() {
  return new Promise((resolve, reject) => {
    const url = new URL(BACKEND_HEALTH_URL);
    const req = http.get(url, (res) => {
      let data = '';
      res.on('data', (chunk) => { data += chunk; });
      res.on('end', () => {
        if (res.statusCode === 200) {
          console.log('[global-setup] 后端服务健康检查通过:', data);
          resolve(true);
        } else {
          reject(new Error(`后端服务返回非200状态码: ${res.statusCode}, 响应: ${data}`));
        }
      });
    });
    req.on('error', (err) => {
      reject(new Error(`无法连接后端服务 ${BACKEND_HEALTH_URL}: ${err.message}`));
    });
    req.setTimeout(5000, () => {
      req.destroy();
      reject(new Error(`连接后端服务超时: ${BACKEND_HEALTH_URL}`));
    });
  });
}

async function retryCheck(retries) {
  for (let i = 0; i < retries; i++) {
    try {
      await checkBackendHealth();
      return;
    } catch (err) {
      console.warn(`[global-setup] 第 ${i + 1}/${retries} 次尝试失败: ${err.message}`);
      if (i < retries - 1) {
        await new Promise((resolve) => setTimeout(resolve, RETRY_INTERVAL_MS));
      }
    }
  }
  throw new Error(`后端服务不可用，已重试 ${retries} 次`);
}

module.exports = async () => {
  console.log('[global-setup] 开始 E2E 测试环境准备...');

  // 检查后端服务可用性
  try {
    await retryCheck(MAX_RETRIES);
    console.log('[global-setup] 后端服务可用');
  } catch (err) {
    console.error('[global-setup] 后端服务不可用，测试可能失败:', err.message);
    // 不阻塞测试，但记录警告
  }

  console.log('[global-setup] E2E 测试环境准备完成');
};