// ZK-CBDC Validation: Mode 3 - ZK-Identity Proofs (zkIP)
import { Prisma } from '@prisma/client';
// Wallet ownership verification without identity disclosure

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { logger } from '@/infrastructure/monitoring/logger';
import { gbigService } from '@/core/identity/gbig/gbig.service';


export interface ZkIdentityProofRequest {
  walletId: string;
  identityClaim: string; // Claim to prove (e.g., "wallet belongs to verified entity")
}

export interface ZkIdentityProof {
  proofId: string;
  proofData: string;
  publicInputs: {
    walletId: string;
    verified: boolean; // Only this is revealed, not the identity
    kycLevel: number; // Can reveal KYC level without revealing identity
  };
}

export class ZkIdentityProofService {
  /**
   * Generate ZK-Identity Proof
   * Proves wallet belongs to verified entity without revealing identity
   */
  async generateIdentityProof(request: ZkIdentityProofRequest): Promise<ZkIdentityProof> {
    const proofId = `ZKIP-${uuidv4()}`;

    // Get identity information from GBIG (in production, this would be done securely)
    const identityInfo = await this.getIdentityInfo(request.walletId);

    if (!identityInfo || !identityInfo.verified) {
      throw new Error('Wallet identity not verified');
    }

    // Generate ZK proof
    const proofData = await this.generateZkProof({
      walletId: request.walletId,
      identityId: identityInfo.identityId,
      kycLevel: identityInfo.kycLevel,
      verified: identityInfo.verified,
    });

    // Create proof record
    await prisma.zkProof.create({
      data: {
        proofId,
        walletId: request.walletId,
        proofType: 'zkIP',
        proofData: proofData as string,
        publicInputs: {
          walletId: request.walletId,
          verified: true,
          kycLevel: identityInfo.kycLevel,
        } as Prisma.InputJsonValue,
        verificationKey: 'default_zkip_vk',
        status: 'verified',
        verifiedAt: new Date(),
      },
    });

    logger.info('ZK-CBDC: Generated ZK-Identity Proof', {
      proofId,
      walletId: request.walletId,
      verified: true,
    });

    return {
      proofId,
      proofData,
      publicInputs: {
        walletId: request.walletId,
        verified: true,
        kycLevel: identityInfo.kycLevel,
      },
    };
  }

  /**
   * Get identity information (internal)
   */
  private async getIdentityInfo(walletId: string): Promise<{
    identityId: string;
    verified: boolean;
    kycLevel: number;
  } | null> {
    // Query GBIG for wallet identity
    // In production, this would use GBIG service
    // For now, simplified lookup
    try {
      // Simplified: assume wallet has identity if it exists in accounts
      const account = await prisma.bankAccount.findFirst({
        where: {
          accountNumber: walletId,
          assetType: 'cbdc',
        },
      });

      if (!account) {
        return null;
      }

      // In production, would query GBIG for actual identity
      return {
        identityId: `IDENTITY-${walletId}`,
        verified: true,
        kycLevel: 2, // Default KYC level
      };
    } catch (error) {
      logger.error('Failed to get identity info', { error, walletId });
      return null;
    }
  }

  /**
   * Generate ZK proof (placeholder)
   */
  private async generateZkProof(data: {
    walletId: string;
    identityId: string;
    kycLevel: number;
    verified: boolean;
  }): Promise<string> {
    // In production, use actual ZK library
    return JSON.stringify({
      type: 'zkIP',
      walletId: data.walletId,
      verified: data.verified,
      kycLevel: data.kycLevel,
      proof: 'placeholder_zk_proof',
    });
  }

  /**
   * Verify ZK-Identity Proof
   */
  async verifyIdentityProof(proofId: string): Promise<boolean> {
    const proof = await prisma.zkProof.findUnique({
      where: { proofId },
    });

    if (!proof || proof.proofType !== 'zkIP') {
      return false;
    }

    // Verify proof
    const publicInputs = proof.publicInputs as unknown as {
      verified?: boolean;
      kycLevel?: number;
    };

    const isValid = publicInputs.verified === true && publicInputs.kycLevel !== undefined;

    if (isValid) {
      await prisma.zkProof.update({
        where: { proofId },
        data: {
          status: 'verified',
          verifiedAt: new Date(),
        },
      });
    }

    return isValid;
  }
}

export const zkIdentityProofService = new ZkIdentityProofService();

