/**
 * [OP-MV002] 商户服务健康检查服务
 * @description 检查商户服务的健康状态，生成健康报告
 * @version 1.0
 */
export class ServiceHealthCheck {
  /**
   * 检查商户服务健康状态
   * @param params 检查参数
   * @param traceInfo 追踪信息
   * @returns 健康检查结果
   */
  public static async checkMerchantServiceHealth(params: {
    merchantId?: string;
    services?: string[];
  }, traceInfo: {
    tenantId: string;
    shopId: string;
    taskId: string;
    traceId: string;
    businessType: 'TOC' | 'TOB';
  }): Promise<{
    overallStatus: 'healthy' | 'degraded' | 'unhealthy';
    services: Array<{
      serviceName: string;
      status: 'healthy' | 'degraded' | 'unhealthy';
      responseTime: number;
      errorCount: number;
      lastChecked: string;
    }>;
    recommendations: string[];
  }> {
    // 模拟服务列表
    const servicesToCheck = params.services || [
      'inventory',
      'order',
      'payment',
      'shipping',
      'notification'
    ];

    // 模拟健康检查结果
    const services = servicesToCheck.map(service => {
      // 生成随机响应时间和错误数
      const responseTime = Math.floor(Math.random() * 500) + 50;
      const errorCount = Math.floor(Math.random() * 5);

      // 计算服务状态
      let status: 'healthy' | 'degraded' | 'unhealthy' = 'healthy';
      if (errorCount > 3 || responseTime > 400) {
        status = 'unhealthy';
      } else if (errorCount > 1 || responseTime > 200) {
        status = 'degraded';
      }

      return {
        serviceName: service,
        status,
        responseTime,
        errorCount,
        lastChecked: new Date().toISOString()
      };
    });

    // 计算整体状态
    const unhealthyCount = services.filter(s => s.status === 'unhealthy').length;
    const degradedCount = services.filter(s => s.status === 'degraded').length;

    let overallStatus: 'healthy' | 'degraded' | 'unhealthy' = 'healthy';
    if (unhealthyCount > 0) {
      overallStatus = 'unhealthy';
    } else if (degradedCount > 0) {
      overallStatus = 'degraded';
    }

    // 生成建议
    const recommendations: string[] = [];
    if (overallStatus === 'unhealthy') {
      recommendations.push('立即检查不健康的服务');
      recommendations.push('考虑重启相关服务');
    } else if (overallStatus === 'degraded') {
      recommendations.push('检查性能瓶颈');
      recommendations.push('优化响应时间');
    } else {
      recommendations.push('保持当前状态');
      recommendations.push('定期进行健康检查');
    }

    // 记录健康检查日志
    console.log(`[ServiceHealthCheck] 健康检查完成 - 整体状态: ${overallStatus}`, {
      ...traceInfo,
      servicesCount: services.length,
      unhealthyCount,
      degradedCount
    });

    return {
      overallStatus,
      services,
      recommendations
    };
  }

  /**
   * 生成健康报告
   * @param merchantId 商户ID
   * @param traceInfo 追踪信息
   * @returns 健康报告
   */
  public static async generateHealthReport(merchantId: string, traceInfo: {
    tenantId: string;
    shopId: string;
    taskId: string;
    traceId: string;
    businessType: 'TOC' | 'TOB';
  }): Promise<{
    reportId: string;
    merchantId: string;
    timestamp: string;
    overallStatus: string;
    serviceDetails: any;
    performanceMetrics: any;
    recommendations: string[];
  }> {
    // 生成报告ID
    const reportId = `HR-${Date.now()}`;
    const timestamp = new Date().toISOString();

    // 模拟服务健康数据
    const serviceDetails = {
      inventory: {
        status: 'healthy',
        responseTime: 120,
        errorRate: 0.01
      },
      order: {
        status: 'degraded',
        responseTime: 250,
        errorRate: 0.05
      },
      payment: {
        status: 'healthy',
        responseTime: 90,
        errorRate: 0.005
      },
      shipping: {
        status: 'healthy',
        responseTime: 150,
        errorRate: 0.02
      },
      notification: {
        status: 'healthy',
        responseTime: 80,
        errorRate: 0.01
      }
    };

    // 计算整体状态
    const overallStatus = Object.values(serviceDetails).some(s => s.status === 'unhealthy') 
      ? 'unhealthy' 
      : Object.values(serviceDetails).some(s => s.status === 'degraded') 
        ? 'degraded' 
        : 'healthy';

    // 计算性能指标
    const performanceMetrics = {
      averageResponseTime: Object.values(serviceDetails).reduce((sum, s) => sum + s.responseTime, 0) / Object.values(serviceDetails).length,
      averageErrorRate: Object.values(serviceDetails).reduce((sum, s) => sum + s.errorRate, 0) / Object.values(serviceDetails).length,
      healthyServices: Object.values(serviceDetails).filter(s => s.status === 'healthy').length,
      totalServices: Object.values(serviceDetails).length
    };

    // 生成建议
    const recommendations = [
      overallStatus === 'unhealthy' ? '立即修复不健康的服务' : '保持服务健康状态',
      performanceMetrics.averageResponseTime > 200 ? '优化服务响应时间' : '响应时间正常',
      performanceMetrics.averageErrorRate > 0.05 ? '减少服务错误率' : '错误率在可接受范围内'
    ];

    // 记录报告生成日志
    console.log(`[ServiceHealthCheck] 生成健康报告 - ID: ${reportId}, 商户: ${merchantId}`, {
      ...traceInfo,
      reportId
    });

    return {
      reportId,
      merchantId,
      timestamp,
      overallStatus,
      serviceDetails,
      performanceMetrics,
      recommendations
    };
  }

  /**
   * 执行服务可用性测试
   * @param params 测试参数
   * @param traceInfo 追踪信息
   * @returns 测试结果
   */
  public static async testServiceAvailability(params: {
    merchantId: string;
    services: string[];
    testDuration: number; // 测试持续时间（秒）
  }, traceInfo: {
    tenantId: string;
    shopId: string;
    taskId: string;
    traceId: string;
    businessType: 'TOC' | 'TOB';
  }): Promise<{
    testId: string;
    merchantId: string;
    startTime: string;
    endTime: string;
    results: Array<{
      serviceName: string;
      availability: number; // 可用性百分比
      responseTimes: number[];
      errorCount: number;
    }>;
  }> {
    // 生成测试ID
    const testId = `AT-${Date.now()}`;
    const startTime = new Date().toISOString();

    // 模拟测试结果
    const results = params.services.map(service => {
      // 生成模拟响应时间和错误数
      const responseTimes: number[] = [];
      let errorCount = 0;

      // 模拟测试过程
      for (let i = 0; i < 10; i++) {
        const responseTime = Math.floor(Math.random() * 300) + 50;
        responseTimes.push(responseTime);
        if (Math.random() < 0.05) {
          errorCount++;
        }
      }

      // 计算可用性
      const availability = ((10 - errorCount) / 10) * 100;

      return {
        serviceName: service,
        availability,
        responseTimes,
        errorCount
      };
    });

    // 模拟测试持续时间
    await new Promise(resolve => setTimeout(resolve, params.testDuration * 1000));

    const endTime = new Date().toISOString();

    // 记录测试日志
    console.log(`[ServiceHealthCheck] 服务可用性测试完成 - ID: ${testId}, 商户: ${params.merchantId}`, {
      ...traceInfo,
      testId,
      duration: params.testDuration
    });

    return {
      testId,
      merchantId: params.merchantId,
      startTime,
      endTime,
      results
    };
  }
}
