// Identity Mapping Service
// Full identity mapping chain: Real Identity → SDIP → ILIE L0/L1 → ILIE L3/L4 → Avatar Identity
// Supplement B: MetaverseDubai Integration Framework

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { logger } from '@/infrastructure/monitoring/logger';
import { ilieService } from '@/core/identity/ilie/ilie.service';
import { sovereignIdentityFabricService } from '@/sovereign/identity/sovereign-identity-fabric.service';


export interface IdentityMappingRequest {
  realIdentityId: string; // Real-world identity reference
  sovereignBankId: string;
  metaverseNodeId: string;
  avatarId: string;
  identityLayer: 'L3' | 'L4';
}

export interface IdentityMappingResult {
  mappingId: string;
  realIdentityId: string;
  sdipIdentityId?: string;
  ilieIdentityId?: string;
  avatarIdentityId: string;
  identityLayer: string;
  status: string;
}

export class IdentityMappingService {
  /**
   * Create full identity mapping chain
   * Flow: Real Identity → SDIP → ILIE L0/L1 → ILIE L3/L4 → Avatar Identity
   */
  async createIdentityMapping(
    request: IdentityMappingRequest
  ): Promise<IdentityMappingResult> {
    logger.info('Identity Mapping: Creating identity mapping', { request });

    // Step 1: Get or create SDIP identity (Sovereign Digital Identity Protocol)
    let sdipIdentityId: string | undefined;
    try {
      // In a full implementation, this would use sovereignIdentityFabricService
      // For now, we'll create a reference
      sdipIdentityId = `SDIP-${uuidv4()}`;
    } catch (error) {
      logger.warn('Identity Mapping: SDIP identity creation skipped', {
        error,
      });
    }

    // Step 2: Get or create ILIE L0/L1 identity
    let ilieIdentityId: string | undefined;
    try {
      // Create ILIE identity with L0/L1 layers
      const ilieIdentity = await ilieService.createInfiniteIdentity({
        entityType: 'digital_entity',
        entityId: request.realIdentityId,
        sovereignBankId: request.sovereignBankId,
        layers: [
          {
            layerNumber: 0,
            layerType: 'classical',
            layerIdentity: request.realIdentityId,
          },
          {
            layerNumber: 1,
            layerType: 'dlt',
            layerIdentity: `DLT-${request.realIdentityId}`,
          },
        ],
      });
      ilieIdentityId = ilieIdentity.identityId;
    } catch (error) {
      logger.warn('Identity Mapping: ILIE L0/L1 creation skipped', { error });
    }

    // Step 3: Add ILIE L3/L4 layers
    if (ilieIdentityId) {
      try {
        await ilieService.addIdentityLayer(ilieIdentityId, {
          layerNumber: request.identityLayer === 'L3' ? 3 : 4,
          layerType: request.identityLayer === 'L3' ? 'cognitive' : 'simulated',
          layerIdentity: `AVATAR-${request.avatarId}`,
          layerMetadata: {
            metaverseNodeId: request.metaverseNodeId,
            avatarId: request.avatarId,
          },
        });
      } catch (error) {
        logger.warn('Identity Mapping: ILIE L3/L4 layer addition skipped', {
          error,
        });
      }
    }

    // Step 4: Create avatar identity
    const avatarIdentity = await prisma.metaverseIdentity.create({
      data: {
        identityId: `AVATAR-ID-${uuidv4()}`,
        metaverseNodeId: request.metaverseNodeId,
        avatarId: request.avatarId,
        identityLayer: request.identityLayer,
        sovereignBankId: request.sovereignBankId,
        identityHash: this.generateIdentityHash({
          realIdentityId: request.realIdentityId,
          avatarId: request.avatarId,
          identityLayer: request.identityLayer,
        }),
        identityData: {
          realIdentityId: request.realIdentityId,
          sdipIdentityId,
          ilieIdentityId,
          mappingChain: [
            'Real Identity',
            'SDIP',
            'ILIE L0/L1',
            `ILIE ${request.identityLayer}`,
            'Avatar Identity',
          ],
        },
        status: 'active',
      },
    });

    logger.info('Identity Mapping: Identity mapping created', {
      mappingId: avatarIdentity.identityId,
      avatarId: request.avatarId,
    });

    return {
      mappingId: avatarIdentity.identityId,
      realIdentityId: request.realIdentityId,
      sdipIdentityId,
      ilieIdentityId,
      avatarIdentityId: avatarIdentity.identityId,
      identityLayer: request.identityLayer,
      status: avatarIdentity.status,
    };
  }

  /**
   * Get identity mapping by avatar ID
   */
  async getIdentityMappingByAvatar(
    metaverseNodeId: string,
    avatarId: string
  ) {
    return await prisma.metaverseIdentity.findFirst({
      where: {
        metaverseNodeId,
        avatarId,
        status: 'active',
      },
    });
  }

  /**
   * Generate identity hash
   */
  private generateIdentityHash(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 identityMappingService = new IdentityMappingService();

