import db from '../config/database';
import { logger } from '../utils/logger';
import { DecisionExplainabilityEngine } from '../core/ai/DecisionExplainabilityEngine';

/**
 * [BIZ_OPS_153] 高频取消订单导致的支付网关风险预警 (Gateway)
 * @description 核心逻辑：分析支付网关的回调日志，识别是否存在大量“取消”、“拒付”或“退款”，这些行为可能导致 PayPal/Stripe 账户被封。
 */
export class PaymentRiskService {
  /**
   * 监控支付网关风险 (BIZ_OPS_153)
   */
  static async monitorPaymentGatewayRisk(tenantId: string, gatewayId: string): Promise<any> {
    logger.info(`[PaymentRisk] Monitoring gateway risk for Tenant: ${tenantId}, Gateway: ${gatewayId}`);

    try {
      // 1. 获取近 7 天的取消率 (模拟)
      const cancellationRate = 0.15; // 15% 取消率
      const threshold = 0.10;

      // 2. 识别风险：如果超过 10%
      if (cancellationRate > threshold) {
        const advice = `GATEWAY RISK ALERT: Cancellation rate (${(cancellationRate * 100).toFixed(1)}%) is above the safe threshold (10%). ` +
          `High risk of account suspension by the payment provider (PayPal/Stripe). ` +
          `Suggesting immediate pause of high-risk traffic or increased anti-fraud review.`;

        // 3. [UX_XAI_01] 记录决策证据链
        await DecisionExplainabilityEngine.logDecision({
          tenantId,
          module: 'PAYMENT_SECURITY',
          resourceId: gatewayId,
          decisionType: 'GATEWAY_SUSPENSION_PREVENTION',
          causalChain: advice,
          factors: [
            { name: 'CancellationRate', value: (cancellationRate * 100).toFixed(1) + '%', weight: 0.9, impact: 'NEGATIVE' },
            { name: 'ThresholdRate', value: (threshold * 100).toFixed(1) + '%', weight: 0.1, impact: 'NEUTRAL' }
          ],
          traceId: 'payment-risk-' + Date.now()
        });

        return { success: true, riskLevel: 'HIGH', cancellationRate, advice, status: 'PENDING_REVIEW' };
      }

      return { success: true, riskLevel: 'LOW', message: 'Gateway risk is within limits' };
    } catch (err: any) {
      logger.error(`[PaymentRisk][WARN] Monitoring failed: ${err.message}`);
      return { success: false, error: err.message };
    }
  }
}