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

export interface SupplierRiskProfile {
  supplierId: string;
  name: string;
  riskLevel: 'LOW' | 'MEDIUM' | 'HIGH' | 'CRITICAL';
  notices: string[];
  lastScanAt: Date;
}

/**
 * [BIZ_OPS_157] 供应商经营风险 (法务/工商) 自动探测 (Supplier Risk Radar)
 * @description 核心逻辑：分析 cf_suppliers 中的经营风险字段，结合绩效数据（defect_rate），识别高危供应商。
 */
export class SupplierRiskRadar {
  /**
   * 执行供应商风险扫描
   */
  static async scanRisks(tenantId: string): Promise<SupplierRiskProfile[]> {
    logger.info(`[SupplierRisk] Scanning risks for tenant: ${tenantId}`);

    try {
      // 1. 获取该租户下绩效异常或有风险记录的供应商 (Zero-Mock Policy)
      const highRiskSuppliers = await db('cf_suppliers')
        .where('tenant_id', tenantId)
        .where(function() {
          this.where('risk_level', '!=', 'LOW')
            .orWhere('defect_rate', '>', 0.05) // 质量异常
            .orWhere('rating_score', '<', 60); // 评分极低
        })
        .select('id', 'name', 'risk_level', 'legal_notices', 'defect_rate', 'rating_score', 'updated_at');

      const profiles: SupplierRiskProfile[] = [];

      for (const supplier of highRiskSuppliers) {
        const notices = supplier.legal_notices ? supplier.legal_notices.split('|') : [];
        let riskLevel: SupplierRiskProfile['riskLevel'] = supplier.risk_level as any;

        // 2. 联动分析：如果质量极差且有法务风险，升级为 CRITICAL
        if (supplier.defect_rate > 0.1 && riskLevel === 'HIGH') {
          riskLevel = 'CRITICAL';
        }

        if (riskLevel === 'CRITICAL' || riskLevel === 'HIGH') {
          const reason = `Supplier ${supplier.name} identified as ${riskLevel} risk. ` +
            `Quality Defect Rate: ${(supplier.defect_rate * 100).toFixed(2)}%. ` +
            `Legal/Business Notices: ${notices.length} found.`;

          // 3. [UX_XAI_01] 记录决策证据链
          await DecisionExplainabilityEngine.logDecision({
            tenantId,
            module: 'SUPPLIER_RISK',
            resourceId: supplier.id,
            decisionType: 'SUPPLIER_REPLACEMENT_SUGGESTION',
            causalChain: reason,
            factors: [
              { name: 'DefectRate', value: supplier.defect_rate, weight: 0.5, impact: 'NEGATIVE' },
              { name: 'LegalRiskLevel', value: supplier.risk_level, weight: 0.5, impact: 'NEGATIVE' }
            ],
            traceId: `risk-radar-${Date.now()}`
          });
        }

        profiles.push({
          supplierId: supplier.id,
          name: supplier.name,
          riskLevel,
          notices,
          lastScanAt: supplier.updated_at
        });
      }

      return profiles;
    } catch (err: any) {
      logger.error(`[SupplierRisk][FATAL] Scan failed: ${err.message}`);
      throw {
        category: 'Logic Conflict',
        rootCause: 'Failed to access cf_suppliers for risk radar',
        mitigation: 'Check cf_suppliers schema and connectivity'
      };
    }
  }
}