// Quantum Envelope Service
// Quantum envelope creation for legacy transactions

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { createHash } from 'crypto';
import { logger } from '@/infrastructure/monitoring/logger';


export interface QuantumEnvelopeRequest {
  legacyTransactionId: string;
  legacyProtocol: string;
  transactionData: any;
}

export interface QuantumEnvelopeResult {
  envelopeId: string;
  quantumHash: string;
  causalConsistencyHash: string;
  dimensionalHarmonizationHash: string;
}

export class QuantumEnvelopeService {
  /**
   * Create quantum envelope for legacy transaction
   * Includes causal-consistency enforcement and dimensional harmonization
   */
  async createQuantumEnvelope(
    request: QuantumEnvelopeRequest
  ): Promise<QuantumEnvelopeResult> {
    logger.info('QPS: Creating quantum envelope', {
      legacyTransactionId: request.legacyTransactionId,
    });

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

    // Step 1: Create quantum hash
    const quantumHash = this.createQuantumHash(request.transactionData);

    // Step 2: Create causal-consistency hash
    const causalConsistencyHash = await this.createCausalConsistencyHash(
      request.transactionData
    );

    // Step 3: Create dimensional harmonization hash
    const dimensionalHarmonizationHash =
      await this.createDimensionalHarmonizationHash(request.transactionData);

    // Step 4: Create envelope record
    const envelope = await prisma.quantum_envelopes.create({
      data: {
        id: uuidv4(),
        envelopeId,
        legacyTransactionId: request.legacyTransactionId,
        legacyProtocol: request.legacyProtocol,
        quantumHash,
        causalConsistencyHash,
        dimensionalHarmonizationHash,
        transactionData: request.transactionData as any,
        status: 'created',
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });

    logger.info('QPS: Quantum envelope created', { envelopeId });

    return {
      envelopeId,
      quantumHash,
      causalConsistencyHash,
      dimensionalHarmonizationHash,
    };
  }

  /**
   * Create quantum hash
   */
  private createQuantumHash(transactionData: any): string {
    const dataString = JSON.stringify(transactionData);
    // Use SHA-3-256 for quantum-safe hashing
    return createHash('sha3-256').update(dataString).digest('hex');
  }

  /**
   * Create causal-consistency hash
   * Ensures transaction causality is preserved across quantum systems
   */
  private async createCausalConsistencyHash(transactionData: any): Promise<string> {
    // Get previous transaction hash for causal chain
    const previousHash = await this.getPreviousTransactionHash(
      transactionData.sourceBankId
    );

    const causalData = {
      transactionData,
      previousHash,
      timestamp: new Date().toISOString(),
      causalOrder: await this.getCausalOrder(transactionData),
    };

    const causalString = JSON.stringify(causalData);
    return createHash('sha3-256').update(causalString).digest('hex');
  }

  /**
   * Create dimensional harmonization hash
   * Ensures transaction is consistent across dimensions (classical, quantum, multiversal)
   */
  private async createDimensionalHarmonizationHash(
    transactionData: any
  ): Promise<string> {
    const dimensionalData = {
      transactionData,
      classicalState: await this.getClassicalState(transactionData),
      quantumState: await this.getQuantumState(transactionData),
      multiversalState: await this.getMultiversalState(transactionData),
      harmonizationTimestamp: new Date().toISOString(),
    };

    const dimensionalString = JSON.stringify(dimensionalData);
    return createHash('sha3-256').update(dimensionalString).digest('hex');
  }

  /**
   * Get previous transaction hash for causal chain
   */
  private async getPreviousTransactionHash(
    sourceBankId: string
  ): Promise<string | null> {
    const lastTransaction = await prisma.quantum_proxy_transactions.findFirst({
      where: { sourceBankId },
      orderBy: { createdAt: 'desc' },
    });

    return lastTransaction?.quantumEnvelopeId || null;
  }

  /**
   * Get causal order for transaction
   */
  private async getCausalOrder(transactionData: any): Promise<number> {
    // Get count of transactions from source bank
    const count = await prisma.quantum_proxy_transactions.count({
      where: { sourceBankId: transactionData.sourceBankId },
    });

    return count + 1;
  }

  /**
   * Get classical state
   */
  private async getClassicalState(transactionData: any): Promise<any> {
    // In production, would fetch from classical ledger
    return {
      ledgerState: 'classical',
      verified: true,
    };
  }

  /**
   * Get quantum state
   */
  private async getQuantumState(transactionData: any): Promise<any> {
    // In production, would fetch from quantum ledger
    return {
      ledgerState: 'quantum',
      verified: true,
    };
  }

  /**
   * Get multiversal state
   */
  private async getMultiversalState(transactionData: any): Promise<any> {
    // In production, would fetch from multiversal ledger
    return {
      ledgerState: 'multiversal',
      verified: true,
    };
  }

  /**
   * Get envelope by ID
   */
  async getEnvelope(envelopeId: string) {
    return await prisma.quantum_envelopes.findUnique({
      where: { envelopeId },
    });
  }

  /**
   * Verify envelope integrity
   */
  async verifyEnvelopeIntegrity(envelopeId: string): Promise<boolean> {
    const envelope = await prisma.quantum_envelopes.findUnique({
      where: { envelopeId },
    });

    if (!envelope) {
      return false;
    }

    // Recalculate hashes and verify
    const quantumHash = this.createQuantumHash(envelope.transactionData as any);
    const causalConsistencyHash = await this.createCausalConsistencyHash(
      envelope.transactionData as any
    );
    const dimensionalHarmonizationHash =
      await this.createDimensionalHarmonizationHash(
        envelope.transactionData as any
      );

    return (
      quantumHash === envelope.quantumHash &&
      causalConsistencyHash === envelope.causalConsistencyHash &&
      dimensionalHarmonizationHash === envelope.dimensionalHarmonizationHash
    );
  }
}

export const quantumEnvelopeService = new QuantumEnvelopeService();

