// Quantum Proxy Server (QPS)
// Main QPS transaction bridging
// Transaction path: legacy_tx → QPS → quantum_wrap → DBIS_QFS

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { logger } from '@/infrastructure/monitoring/logger';
import { quantumEnvelopeService } from './quantum-envelope.service';
import { quantumTranslationService } from './quantum-translation.service';


export interface QuantumProxyRequest {
  legacyTransactionId: string;
  legacyProtocol: 'SWIFT' | 'ISO20022' | 'ACH' | 'SEPA' | 'PRIVATE_BANK';
  sourceBankId: string;
  destinationBankId: string;
  amount: string;
  currencyCode: string;
  transactionData: any; // Legacy transaction data
}

export interface QuantumProxyResult {
  proxyTransactionId: string;
  quantumEnvelopeId: string;
  dbisQfsTransactionId: string;
  status: string;
  translationId: string;
}

export class QuantumProxyService {
  /**
   * Bridge transaction from legacy system to DBIS QFS
   * Transaction path: legacy_tx → QPS → quantum_wrap → DBIS_QFS
   */
  async bridgeTransaction(
    request: QuantumProxyRequest
  ): Promise<QuantumProxyResult> {
    logger.info('QPS: Bridging transaction from legacy system', {
      legacyTransactionId: request.legacyTransactionId,
      legacyProtocol: request.legacyProtocol,
    });

    const proxyTransactionId = `QPS-${uuidv4()}`;

    try {
      // Step 1: Create quantum envelope
      const envelopeResult = await quantumEnvelopeService.createQuantumEnvelope({
        legacyTransactionId: request.legacyTransactionId,
        legacyProtocol: request.legacyProtocol,
        transactionData: request.transactionData,
      });

      // Step 2: Translate FX & risk for legacy protocols
      const translationResult =
        await quantumTranslationService.translateLegacyTransaction({
          legacyProtocol: request.legacyProtocol,
          transactionData: request.transactionData,
          amount: request.amount,
          currencyCode: request.currencyCode,
        });

      // Step 3: Create quantum-wrapped transaction
      const quantumWrappedTx = await this.createQuantumWrappedTransaction({
        proxyTransactionId,
        envelopeId: envelopeResult.envelopeId,
        sourceBankId: request.sourceBankId,
        destinationBankId: request.destinationBankId,
        amount: request.amount,
        currencyCode: request.currencyCode,
        translationData: translationResult,
      });

      // Step 4: Submit to DBIS QFS
      const dbisQfsTransactionId = await this.submitToDbisQfs(
        quantumWrappedTx
      );

      // Step 5: Create proxy transaction record
      const proxyTransaction = await prisma.quantumProxyTransaction.create({
        data: {
          proxyTransactionId,
          legacyTransactionId: request.legacyTransactionId,
          legacyProtocol: request.legacyProtocol,
          quantumEnvelopeId: envelopeResult.envelopeId,
          translationId: translationResult.translationId,
          dbisQfsTransactionId,
          sourceBankId: request.sourceBankId,
          destinationBankId: request.destinationBankId,
          amount: new Decimal(request.amount),
          currencyCode: request.currencyCode,
          status: 'bridged',
          bridgedAt: new Date(),
        },
      });

      logger.info('QPS: Transaction bridged successfully', {
        proxyTransactionId,
        dbisQfsTransactionId,
      });

      return {
        proxyTransactionId,
        quantumEnvelopeId: envelopeResult.envelopeId,
        dbisQfsTransactionId,
        status: 'bridged',
        translationId: translationResult.translationId,
      };
    } catch (error) {
      logger.error('QPS: Transaction bridging failed', {
        proxyTransactionId,
        error: error instanceof Error ? error.message : String(error),
      });

      // Create failed transaction record
      await prisma.quantumProxyTransaction.create({
        data: {
          proxyTransactionId,
          legacyTransactionId: request.legacyTransactionId,
          legacyProtocol: request.legacyProtocol,
          sourceBankId: request.sourceBankId,
          destinationBankId: request.destinationBankId,
          amount: new Decimal(request.amount),
          currencyCode: request.currencyCode,
          status: 'failed',
        },
      });

      throw error;
    }
  }

  /**
   * Create quantum-wrapped transaction
   */
  private async createQuantumWrappedTransaction(data: {
    proxyTransactionId: string;
    envelopeId: string;
    sourceBankId: string;
    destinationBankId: string;
    amount: string;
    currencyCode: string;
    translationData: any;
  }): Promise<any> {
    return {
      transactionId: data.proxyTransactionId,
      envelopeId: data.envelopeId,
      sourceBankId: data.sourceBankId,
      destinationBankId: data.destinationBankId,
      amount: data.amount,
      currencyCode: data.currencyCode,
      quantumWrapped: true,
      translationData: data.translationData,
      timestamp: new Date().toISOString(),
    };
  }

  /**
   * Submit to DBIS QFS (Quantum Financial System)
   * In production, this would interface with the actual QFS
   */
  private async submitToDbisQfs(quantumWrappedTx: any): Promise<string> {
    // Placeholder: In production, this would call the actual QFS API
    const dbisQfsTransactionId = `QFS-${uuidv4()}`;

    logger.info('QPS: Submitting to DBIS QFS', {
      dbisQfsTransactionId,
      quantumWrappedTx,
    });

    // Simulate QFS submission
    // In production: await dbisQfsService.submitTransaction(quantumWrappedTx);

    return dbisQfsTransactionId;
  }

  /**
   * Get proxy transaction by ID
   */
  async getProxyTransaction(proxyTransactionId: string) {
    return await prisma.quantumProxyTransaction.findUnique({
      where: { proxyTransactionId },
      include: {
        envelope: true,
        translation: true,
      },
    });
  }

  /**
   * Get proxy transactions for a bank
   */
  async getProxyTransactionsForBank(sovereignBankId: string) {
    return await prisma.quantumProxyTransaction.findMany({
      where: {
        OR: [
          { sourceBankId: sovereignBankId },
          { destinationBankId: sovereignBankId },
        ],
      },
      orderBy: { createdAt: 'desc' },
      include: {
        envelope: true,
        translation: true,
      },
    });
  }

  /**
   * Get proxy transactions by legacy protocol
   */
  async getProxyTransactionsByProtocol(
    legacyProtocol: string,
    limit: number = 100
  ) {
    return await prisma.quantumProxyTransaction.findMany({
      where: { legacyProtocol },
      orderBy: { createdAt: 'desc' },
      take: limit,
    });
  }
}

export const quantumProxyService = new QuantumProxyService();

