// Quantum-Resistant Signatures Service
// XMSS/SPHINCS+ state proofs

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';


export class QuantumResistantSignaturesService {
  /**
   * Create PQ signature block
   */
  async createPQSignatureBlock(
    blockId: string,
    algorithm: string,
    signature: string,
    publicKey: string
  ) {
    const signatureId = `PQ-SIG-${uuidv4()}`;

    return await prisma.pq_signature_blocks.create({
      data: {
        id: uuidv4(),
        signatureId,
        blockId,
        algorithm, // XMSS or SPHINCS+
        signature,
        publicKey,
        verificationStatus: 'pending',
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });
  }

  /**
   * Verify PQ signature
   */
  async verifyPQSignature(signatureId: string): Promise<boolean> {
    const signature = await prisma.pq_signature_blocks.findUnique({
      where: { signatureId },
    });

    if (!signature) {
      return false;
    }

    // In production, would use actual PQC library to verify
    // For now, simulate verification
    const verified = signature.signature.length > 0 && signature.publicKey.length > 0;

    await prisma.pq_signature_blocks.update({
      where: { signatureId },
      data: {
        verificationStatus: verified ? 'verified' : 'rejected',
        verifiedAt: verified ? new Date() : null,
      },
    });

    return verified;
  }

  /**
   * Get signature blocks for block
   */
  async getSignaturesForBlock(blockId: string) {
    return await prisma.pq_signature_blocks.findMany({
      where: { blockId },
    });
  }
}

export const quantumResistantSignaturesService = new QuantumResistantSignaturesService();

