/**
 * [OP-MV001] 多商户系统监控服务
 * @description 监控多商户系统的健康状态，收集商户指标数据
 * @version 1.0
 */
export class MerchantMonitorService {
  /**
   * 监控商户系统健康状态
   * @param params 监控参数
   * @param traceInfo 追踪信息
   * @returns 监控数据
   */
  public static async monitorMerchantSystem(params: {
    merchantId?: string;
    timeRange?: {
      start: string;
      end: string;
    };
  }, traceInfo: {
    tenantId: string;
    shopId: string;
    taskId: string;
    traceId: string;
    businessType: 'TOC' | 'TOB';
  }): Promise<{
    status: 'healthy' | 'warning' | 'critical';
    metrics: {
      activeMerchants: number;
      pendingApproval: number;
      suspendedMerchants: number;
      averageResponseTime: number;
      errorRate: number;
    };
    details: Array<{
      merchantId: string;
      status: string;
      lastActivity: string;
      issues: string[];
    }>;
  }> {
    // 模拟监控数据
    const metrics = {
      activeMerchants: 150,
      pendingApproval: 12,
      suspendedMerchants: 5,
      averageResponseTime: 120,
      errorRate: 0.02
    };

    // 计算系统状态
    let status: 'healthy' | 'warning' | 'critical' = 'healthy';
    if (metrics.errorRate > 0.05 || metrics.averageResponseTime > 500) {
      status = 'critical';
    } else if (metrics.errorRate > 0.02 || metrics.averageResponseTime > 200) {
      status = 'warning';
    }

    // 模拟商户详情
    const details = [
      {
        merchantId: 'M001',
        status: 'active',
        lastActivity: '2026-03-18T10:00:00Z',
        issues: []
      },
      {
        merchantId: 'M002',
        status: 'warning',
        lastActivity: '2026-03-18T09:30:00Z',
        issues: ['响应时间偏高']
      },
      {
        merchantId: 'M003',
        status: 'critical',
        lastActivity: '2026-03-18T08:00:00Z',
        issues: ['连续5次请求失败', '库存同步异常']
      }
    ];

    // 记录监控日志
    console.log(`[MerchantMonitorService] 监控完成 - 状态: ${status}, 商户数: ${metrics.activeMerchants}`, {
      ...traceInfo,
      metrics
    });

    return {
      status,
      metrics,
      details
    };
  }

  /**
   * 生成监控报告
   * @param traceInfo 追踪信息
   * @returns 监控报告
   */
  public static async generateMonitorReport(traceInfo: {
    tenantId: string;
    shopId: string;
    taskId: string;
    traceId: string;
    businessType: 'TOC' | 'TOB';
  }): Promise<{
    reportId: string;
    timestamp: string;
    summary: string;
    metrics: any;
    recommendations: string[];
  }> {
    // 生成报告ID
    const reportId = `MR-${Date.now()}`;
    const timestamp = new Date().toISOString();

    // 模拟监控数据
    const metrics = {
      systemHealth: 'healthy',
      merchantStats: {
        total: 167,
        active: 150,
        pending: 12,
        suspended: 5
      },
      performance: {
        avgResponseTime: 120,
        errorRate: 0.02,
        throughput: 1200
      }
    };

    // 生成建议
    const recommendations = [
      '定期检查商户账户状态',
      '优化响应时间超过200ms的商户服务',
      '对连续失败的商户进行人工干预'
    ];

    // 记录报告生成日志
    console.log(`[MerchantMonitorService] 生成监控报告 - ID: ${reportId}`, {
      ...traceInfo,
      reportId
    });

    return {
      reportId,
      timestamp,
      summary: `系统整体健康，共有${metrics.merchantStats.total}个商户，其中${metrics.merchantStats.active}个活跃`,
      metrics,
      recommendations
    };
  }

  /**
   * 设置监控告警阈值
   * @param thresholds 告警阈值
   * @param traceInfo 追踪信息
   * @returns 设置结果
   */
  public static async setAlertThresholds(thresholds: {
    errorRate: number;
    responseTime: number;
    merchantDown: number;
  }, traceInfo: {
    tenantId: string;
    shopId: string;
    taskId: string;
    traceId: string;
    businessType: 'TOC' | 'TOB';
  }): Promise<{
    success: boolean;
    message: string;
    thresholds: typeof thresholds;
  }> {
    // 验证阈值
    if (thresholds.errorRate < 0 || thresholds.errorRate > 1) {
      throw new Error('错误率阈值必须在0-1之间');
    }

    if (thresholds.responseTime < 0) {
      throw new Error('响应时间阈值必须大于0');
    }

    if (thresholds.merchantDown < 0) {
      throw new Error('商户宕机阈值必须大于0');
    }

    // 记录阈值设置日志
    console.log(`[MerchantMonitorService] 设置告警阈值`, {
      ...traceInfo,
      thresholds
    });

    return {
      success: true,
      message: '告警阈值设置成功',
      thresholds
    };
  }
}
