// MEN (Metaverse Economic Node) Validation Service
// Validates transactions using ILIE and GASE

import prisma from '@/shared/database/prisma';
import { ilieService } from '@/core/identity/ilie/ilie.service';
import { logger } from '@/infrastructure/monitoring/logger';


export interface MenValidationRequest {
  metaverseNodeId: string;
  sourceAvatarId: string;
  destinationAvatarId: string;
  transactionId: string;
  amount: string;
  currencyCode: string;
}

export interface MenValidationResult {
  validated: boolean;
  ilieValidated: boolean;
  gaseValidated: boolean;
  identityLayer?: string;
  validationHash: string;
}

export class MenValidationService {
  /**
   * Validate transaction through MEN
   * Validates using ILIE (Infinite-Layer Identity) and GASE (Global Asset Settlement Engine)
   */
  async validateTransaction(
    request: MenValidationRequest
  ): Promise<MenValidationResult> {
    logger.info('MEN: Validating transaction', { request });

    // Step 1: Get source avatar identity
    const sourceIdentity = await prisma.metaverseIdentity.findFirst({
      where: {
        metaverseNodeId: request.metaverseNodeId,
        avatarId: request.sourceAvatarId,
        status: 'active',
      },
    });

    if (!sourceIdentity) {
      throw new Error(`Source avatar identity not found: ${request.sourceAvatarId}`);
    }

    // Step 2: Validate ILIE identity (L3/L4)
    let ilieValidated = false;
    let identityLayer: string | undefined;

    if (sourceIdentity.identityLayer === 'L3' || sourceIdentity.identityLayer === 'L4') {
      // Check if ILIE identity exists and is valid
      try {
        // In a full implementation, this would check the ILIE service
        // For now, we assume validation passes if identity exists
        ilieValidated = true;
        identityLayer = sourceIdentity.identityLayer;
      } catch (error) {
        logger.warn('MEN: ILIE validation failed', { error, sourceAvatarId: request.sourceAvatarId });
        ilieValidated = false;
      }
    }

    // Step 3: GASE validation (Global Asset Settlement Engine)
    // This would check asset availability, compliance, etc.
    const gaseValidated = await this.validateGase(request);

    // Step 4: Generate validation hash
    const validationHash = this.generateValidationHash({
      transactionId: request.transactionId,
      sourceAvatarId: request.sourceAvatarId,
      destinationAvatarId: request.destinationAvatarId,
      amount: request.amount,
      currencyCode: request.currencyCode,
      ilieValidated,
      gaseValidated,
    });

    const validated = ilieValidated && gaseValidated;

    logger.info('MEN: Validation completed', {
      transactionId: request.transactionId,
      validated,
      ilieValidated,
      gaseValidated,
    });

    return {
      validated,
      ilieValidated,
      gaseValidated,
      identityLayer,
      validationHash,
    };
  }

  /**
   * Validate using GASE (Global Asset Settlement Engine)
   */
  private async validateGase(
    request: MenValidationRequest
  ): Promise<boolean> {
    // In a full implementation, this would:
    // 1. Check asset availability
    // 2. Verify compliance rules
    // 3. Check liquidity
    // 4. Validate transaction limits

    // For now, return true if basic checks pass
    try {
      // Verify metaverse node is active
      const node = await prisma.metaverseNode.findUnique({
        where: { nodeId: request.metaverseNodeId },
      });

      if (!node || node.status !== 'active') {
        return false;
      }

      // Additional GASE validations would go here
      return true;
    } catch (error) {
      logger.error('MEN: GASE validation error', { error });
      return false;
    }
  }

  /**
   * Generate validation hash
   */
  private generateValidationHash(data: Record<string, unknown>): string {
    const crypto = require('crypto');
    const hash = crypto.createHash('sha256');
    hash.update(JSON.stringify(data));
    return hash.digest('hex');
  }
}

export const menValidationService = new MenValidationService();

