// AS4 Compliance Gate Service
// Policy-required checks (sanctions, AML)

import { logger } from '@/infrastructure/monitoring/logger';

export interface ComplianceCheckResult {
  passed: boolean;
  reason?: string;
  compliancePackageRef?: string;
  screeningResults?: any;
}

export class ComplianceGateService {
  /**
   * Check compliance for instruction
   */
  async checkCompliance(data: {
    fromMemberId: string;
    toMemberId: string;
    amount: string;
    currency: string;
    debtorAccount: string;
    creditorAccount: string;
    compliancePackageRef?: string;
  }): Promise<ComplianceCheckResult> {
    try {
      // Step 1: Sanctions screening
      const sanctionsResult = await this.checkSanctions(data);
      if (!sanctionsResult.passed) {
        return sanctionsResult;
      }

      // Step 2: AML/CTF checks
      const amlResult = await this.checkAML(data);
      if (!amlResult.passed) {
        return amlResult;
      }

      // Step 3: Generate compliance package reference if not provided
      const compliancePackageRef = data.compliancePackageRef || this.generateCompliancePackageRef();

      logger.info('Compliance check passed', {
        fromMemberId: data.fromMemberId,
        toMemberId: data.toMemberId,
        compliancePackageRef,
      });

      return {
        passed: true,
        compliancePackageRef,
        screeningResults: {
          sanctions: sanctionsResult.screeningResults,
          aml: amlResult.screeningResults,
        },
      };
    } catch (error) {
      logger.error('Compliance check failed', {
        error: error instanceof Error ? error.message : 'Unknown error',
        fromMemberId: data.fromMemberId,
      });

      return {
        passed: false,
        reason: error instanceof Error ? error.message : 'Unknown error',
      };
    }
  }

  /**
   * Check sanctions screening
   */
  private async checkSanctions(data: {
    fromMemberId: string;
    toMemberId: string;
    debtorAccount: string;
    creditorAccount: string;
  }): Promise<ComplianceCheckResult> {
    // TODO: Integrate with actual sanctions screening service
    // This would call the compliance/aml service

    // Placeholder: assume passed for now
    logger.info('Sanctions screening performed', {
      fromMemberId: data.fromMemberId,
      toMemberId: data.toMemberId,
    });

    return {
      passed: true,
      screeningResults: {
        screenedAt: new Date().toISOString(),
        result: 'CLEAR',
      },
    };
  }

  /**
   * Check AML/CTF
   */
  private async checkAML(data: {
    fromMemberId: string;
    toMemberId: string;
    amount: string;
    currency: string;
  }): Promise<ComplianceCheckResult> {
    // TODO: Integrate with actual AML/CTF service
    // This would call the compliance/aml service

    // Placeholder: assume passed for now
    logger.info('AML/CTF check performed', {
      fromMemberId: data.fromMemberId,
      toMemberId: data.toMemberId,
      amount: data.amount,
    });

    return {
      passed: true,
      screeningResults: {
        checkedAt: new Date().toISOString(),
        result: 'CLEAR',
      },
    };
  }

  /**
   * Generate compliance package reference
   */
  private generateCompliancePackageRef(): string {
    const timestamp = new Date().toISOString().replace(/[-:]/g, '').split('.')[0];
    const random = Math.random().toString(36).substring(2, 8).toUpperCase();
    return `CP-${timestamp}-${random}`;
  }
}

export const complianceGateService = new ComplianceGateService();
