// Quantum Signature Validation Service
// Integrates with existing quantum-crypto.service.ts

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


export class NceQuantumService {
  /**
   * Get quantum signatures for ledger state
   */
  async getQuantumSignatures(ledgerStateHash: string): Promise<Record<string, unknown>> {
    // In production, this would retrieve actual quantum signatures
    // For now, return mock structure
    return {
      signatures: [],
      threshold: 3, // Minimum signatures required
      verified: false,
    };
  }

  /**
   * Create quantum signature for consensus state
   */
  async createQuantumSignature(
    stateId: string,
    quantumKeyId: string,
    signatureType: string = 'pq_dilithium'
  ) {
    const state = await prisma.neural_consensus_states.findUnique({
      where: { stateId },
    });

    if (!state) {
      throw new Error(`Consensus state not found: ${stateId}`);
    }

    // Generate signature using quantum crypto service
    const message = JSON.stringify({
      stateId,
      ledgerStateHash: state.ledgerStateHash,
      timestamp: new Date().toISOString(),
    });

    // In production, would use actual quantum signature generation
    // For now, create mock signature
    const signature = `quantum_sig_${uuidv4()}`;

    const signatureId = `NQS-${uuidv4()}`;

    const quantumSignature = await prisma.neural_quantum_signatures.create({
      data: {
        id: uuidv4(),
        signatureId,
        stateId,
        quantumKeyId,
        signature,
        signatureType,
        thresholdMet: false, // Would be set based on threshold validation
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });

    return quantumSignature;
  }

  /**
   * Validate quantum signatures
   */
  async validateSignatures(
    stateId: string,
    quantumSignatures: Record<string, unknown>
  ): Promise<boolean> {
    const signatures = await prisma.neural_quantum_signatures.findMany({
      where: { stateId },
    });

    if (signatures.length === 0) {
      return false;
    }

    // Check if threshold is met
    const threshold = (quantumSignatures.threshold as number) || 1;
    const verifiedCount = signatures.filter((s) => s.thresholdMet).length;

    if (verifiedCount >= threshold) {
      // Update all signatures as threshold met
      await Promise.all(
        signatures.map((sig) =>
          prisma.neural_quantum_signatures.update({
            where: { signatureId: sig.signatureId },
            data: {
              thresholdMet: true,
              verifiedAt: new Date(),
            },
          })
        )
      );
      return true;
    }

    return false;
  }

  /**
   * Get quantum signatures for state
   */
  async getSignaturesForState(stateId: string) {
    return prisma.neural_quantum_signatures.findMany({
      where: { stateId },
    });
  }
}

export const nceQuantumService = new NceQuantumService();

