// Quantum Wallet Service
// Wallet creation with PQC keys (Dilithium signatures, Kyber key exchange)

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { quantumCryptoService } from '@/infrastructure/quantum/quantum-crypto.service';
import { createHash } from 'crypto';


export interface QuantumWalletRequest {
  sovereignBankId: string;
  walletType: string; // retail, wholesale, institutional
  currencyCode: string;
}

export interface QuantumWalletResult {
  walletId: string;
  dilithiumKeyId: string;
  kyberKeyId: string;
  hsmIdentityCert: string;
  status: string;
}

export class QuantumWalletService {
  /**
   * Create quantum-safe wallet
   */
  async createWallet(
    request: QuantumWalletRequest
  ): Promise<QuantumWalletResult> {
    const walletId = `QWALLET-${uuidv4()}`;

    // Generate PQC key pairs
    // Dilithium for signatures
    const dilithiumKey = await quantumCryptoService.generatePQCKeyPair(
      'CRYSTALS-Dilithium',
      `quantum_wallet_signature_${walletId}`
    );

    // Kyber for key exchange
    const kyberKey = await quantumCryptoService.generatePQCKeyPair(
      'CRYSTALS-Kyber',
      `quantum_wallet_key_exchange_${walletId}`
    );

    // Generate HSM-bound identity certificate
    const hsmIdentityCert = await this.generateHSMIdentityCert(
      walletId,
      request.sovereignBankId,
      dilithiumKey.keyId,
      kyberKey.keyId
    );

    // Create quantum wallet
    const wallet = await prisma.quantumWallet.create({
      data: {
        walletId,
        sovereignBankId: request.sovereignBankId,
        walletType: request.walletType,
        currencyCode: request.currencyCode,
        balance: new Decimal(0),
        dilithiumKeyId: dilithiumKey.keyId,
        kyberKeyId: kyberKey.keyId,
        hsmIdentityCert,
        status: 'active',
      },
    });

    return {
      walletId: wallet.walletId,
      dilithiumKeyId: wallet.dilithiumKeyId,
      kyberKeyId: wallet.kyberKeyId,
      hsmIdentityCert: wallet.hsmIdentityCert,
      status: wallet.status,
    };
  }

  /**
   * Generate HSM-bound identity certificate
   */
  private async generateHSMIdentityCert(
    walletId: string,
    sovereignBankId: string,
    dilithiumKeyId: string,
    kyberKeyId: string
  ): Promise<string> {
    // In production, this would call actual HSM
    // For now, generate a certificate hash
    const certData = {
      walletId,
      sovereignBankId,
      dilithiumKeyId,
      kyberKeyId,
      timestamp: new Date().toISOString(),
    };

    const certString = JSON.stringify(certData);
    const certHash = createHash('sha3-256').update(certString).digest('hex');
    const cert = `HSM-CERT-${certHash}`;

    return cert;
  }

  /**
   * Get wallet details
   */
  async getWallet(walletId: string): Promise<any> {
    const wallet = await prisma.quantumWallet.findUnique({
      where: { walletId },
    });

    if (!wallet) {
      throw new Error(`Wallet not found: ${walletId}`);
    }

    return wallet;
  }

  /**
   * Update wallet balance
   */
  async updateBalance(walletId: string, amount: string, operation: 'add' | 'subtract'): Promise<void> {
    const wallet = await prisma.quantumWallet.findUnique({
      where: { walletId },
    });

    if (!wallet) {
      throw new Error(`Wallet not found: ${walletId}`);
    }

    const currentBalance = wallet.balance;
    const amountDecimal = new Decimal(amount);
    const newBalance = operation === 'add'
      ? currentBalance.plus(amountDecimal)
      : currentBalance.minus(amountDecimal);

    if (newBalance.isNegative()) {
      throw new Error('Insufficient balance');
    }

    await prisma.quantumWallet.update({
      where: { walletId },
      data: { balance: newBalance },
    });
  }

  /**
   * Suspend wallet
   */
  async suspendWallet(walletId: string): Promise<void> {
    await prisma.quantumWallet.update({
      where: { walletId },
      data: { status: 'suspended' },
    });
  }

  /**
   * Revoke wallet
   */
  async revokeWallet(walletId: string): Promise<void> {
    await prisma.quantumWallet.update({
      where: { walletId },
      data: { status: 'revoked' },
    });
  }
}

export const quantumWalletService = new QuantumWalletService();

