// Metaverse Settlement Pipeline Service
// Full pipeline orchestrator: Avatar Tx → MEN → Validate (ILIE/GASE) → FX/SSU Engine → CBDC/GRU Handling → GAS Atomic Settlement → Ω-Layer Finality → DBIS Prime Ledger
// Supplement B: MetaverseDubai Integration Framework

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { logger } from '@/infrastructure/monitoring/logger';
import { avatarTransactionService } from './avatar-transaction.service';
import { menValidationService } from './men-validation.service';
import { gasSettlementService } from '@/core/settlement/gas/gas-settlement.service';
import { omegaLayerService } from '@/core/settlement/omega/omega-layer.service';
import { gssMasterLedgerService } from '@/core/settlement/gss/gss-master-ledger.service';
import { fxService } from '@/core/fx/fx.service';
import { ssuService } from '@/core/settlement/ssu/ssu-service';


export interface MetaverseSettlementPipelineRequest {
  metaverseNodeId: string;
  sourceAvatarId: string;
  destinationAvatarId: string;
  amount: string;
  currencyCode: string;
  assetType: string;
  transactionType?: 'payment' | 'asset_transfer' | 'land_purchase';
  useSsu?: boolean;
  useCbdc?: boolean;
  useGru?: boolean;
  metadata?: Record<string, unknown>;
}

export interface MetaverseSettlementPipelineResult {
  pipelineId: string;
  transactionId: string;
  settlementId: string;
  gasSettlementId: string;
  omegaStateId?: string;
  dbisPrimeEntryId?: string;
  status: string;
  stages: {
    avatarTx: boolean;
    menValidation: boolean;
    fxSsu: boolean;
    gasSettlement: boolean;
    omegaFinality: boolean;
    dbisPrime: boolean;
  };
}

export class MetaverseSettlementPipelineService {
  /**
   * Execute full settlement pipeline
   * Flow: Avatar Tx → MEN → Validate (ILIE/GASE) → FX/SSU Engine → CBDC/GRU Handling → GAS Atomic Settlement → Ω-Layer Finality → DBIS Prime Ledger
   */
  async executeSettlementPipeline(
    request: MetaverseSettlementPipelineRequest
  ): Promise<MetaverseSettlementPipelineResult> {
    const pipelineId = `PIPELINE-${uuidv4()}`;
    logger.info('Pipeline: Starting metaverse settlement pipeline', {
      pipelineId,
      request,
    });

    const stages = {
      avatarTx: false,
      menValidation: false,
      fxSsu: false,
      gasSettlement: false,
      omegaFinality: false,
      dbisPrime: false,
    };

    try {
      // Stage 1: Avatar Transaction
      logger.info('Pipeline: Stage 1 - Avatar Transaction', { pipelineId });
      const avatarTx = await avatarTransactionService.createAvatarTransaction({
        metaverseNodeId: request.metaverseNodeId,
        sourceAvatarId: request.sourceAvatarId,
        destinationAvatarId: request.destinationAvatarId,
        amount: request.amount,
        currencyCode: request.currencyCode,
        assetType: request.assetType,
        transactionType: request.transactionType,
        metadata: request.metadata,
      });
      stages.avatarTx = true;
      logger.info('Pipeline: Stage 1 completed', {
        pipelineId,
        transactionId: avatarTx.transactionId,
      });

      // Stage 2: MEN Validation (ILIE/GASE)
      logger.info('Pipeline: Stage 2 - MEN Validation', { pipelineId });
      const validation = await menValidationService.validateTransaction({
        metaverseNodeId: request.metaverseNodeId,
        sourceAvatarId: request.sourceAvatarId,
        destinationAvatarId: request.destinationAvatarId,
        transactionId: avatarTx.transactionId,
        amount: request.amount,
        currencyCode: request.currencyCode,
      });

      if (!validation.validated) {
        throw new Error(
          `MEN validation failed: ILIE=${validation.ilieValidated}, GASE=${validation.gaseValidated}`
        );
      }
      stages.menValidation = true;
      logger.info('Pipeline: Stage 2 completed', {
        pipelineId,
        validated: validation.validated,
      });

      // Stage 3: FX/SSU Engine → CBDC/GRU Handling
      logger.info('Pipeline: Stage 3 - FX/SSU Engine', { pipelineId });
      let fxSsuResult: { settlementId?: string; fxRate?: number } = {};

      if (request.useSsu) {
        // Use SSU for settlement
        // In a full implementation, this would use SSU settlement
        // For now, we'll mark it as processed
        fxSsuResult.settlementId = `SSU-SETTLE-${uuidv4()}`;
      } else {
        // Use FX engine
        // In a full implementation, this would execute FX conversion
        // For now, we'll proceed with the original currency
        fxSsuResult.fxRate = 1.0;
      }
      stages.fxSsu = true;
      logger.info('Pipeline: Stage 3 completed', { pipelineId, fxSsuResult });

      // Stage 4: GAS Atomic Settlement
      logger.info('Pipeline: Stage 4 - GAS Atomic Settlement', { pipelineId });
      const gasResult = await gasSettlementService.executeGasSettlement({
        sourceBankId: 'METAVERSE-SOURCE',
        destinationBankId: 'METAVERSE-DEST',
        amount: parseFloat(request.amount),
        currencyCode: request.currencyCode,
        assetType: request.assetType,
        networkType: 'multiversal',
        transactionId: avatarTx.transactionId,
      });
      stages.gas_settlements = true;
      logger.info('Pipeline: Stage 4 completed', {
        pipelineId,
        gasSettlementId: gasResult.gasSettlementId,
      });

      // Stage 5: Ω-Layer Finality
      logger.info('Pipeline: Stage 5 - Ω-Layer Finality', { pipelineId });
      const omegaResult = await omegaLayerService.mergeStates({
        primeState: {
          transactionId: avatarTx.transactionId,
          gasSettlementId: gasResult.gasSettlementId,
          amount: request.amount,
          currencyCode: request.currencyCode,
        },
        parallelState: {
          metaverseNodeId: request.metaverseNodeId,
          sourceAvatarId: request.sourceAvatarId,
          destinationAvatarId: request.destinationAvatarId,
        },
      });
      stages.omegaFinality = true;
      const omegaStateId = (omegaResult.mergedState as any)?.stateId || `OMEGA-${uuidv4()}`;
      logger.info('Pipeline: Stage 5 completed', {
        pipelineId,
        consistencyStatus: omegaResult.consistencyStatus,
        omegaStateId,
      });

      // Stage 6: DBIS Prime Ledger
      logger.info('Pipeline: Stage 6 - DBIS Prime Ledger', { pipelineId });
      const dbisResult = await gssMasterLedgerService.postToMasterLedger({
        nodeId: 'METAVERSE-NODE',
        sourceBankId: 'METAVERSE-SOURCE',
        destinationBankId: 'METAVERSE-DEST',
        amount: request.amount,
        currencyCode: request.currencyCode,
        assetType: request.assetType,
      });
      stages.dbisPrime = true;
      logger.info('Pipeline: Stage 6 completed', {
        pipelineId,
        entryId: dbisResult.entryId,
      });

      // Create pipeline record
      const settlementId = `SETTLE-${uuidv4()}`;
      await prisma.metaverse_settlements.create({
        data: {
          id: uuidv4(),
          settlementId,
          metaverseNodeId: request.metaverseNodeId,
          gasSettlementId: gasResult.gasSettlementId,
          sourceBankId: 'METAVERSE-SOURCE',
          destinationBankId: 'METAVERSE-DEST',
          virtualLandId: request.assetType === 'virtual_land' ? 'LAND-001' : 'ASSET-001',
          amount: new Decimal(request.amount),
          currencyCode: request.currencyCode,
          assetType: request.assetType,
          status: 'settled',
          settledAt: new Date(),
          createdAt: new Date(),
          updatedAt: new Date(),
        },
      });

      logger.info('Pipeline: Settlement pipeline completed successfully', {
        pipelineId,
        settlementId,
      });

      return {
        pipelineId,
        transactionId: avatarTx.transactionId,
        settlementId,
        gasSettlementId: gasResult.gasSettlementId,
        omegaStateId,
        dbisPrimeEntryId: dbisResult.entryId,
        status: 'settled',
        stages,
      };
    } catch (error: any) {
      logger.error('Pipeline: Settlement pipeline failed', {
        pipelineId,
        error: error.message,
        stages,
      });
      throw error;
    }
  }

  /**
   * Get pipeline status
   */
  async getPipelineStatus(pipelineId: string) {
    // In a full implementation, this would query pipeline state
    return {
      pipelineId,
      status: 'completed',
    };
  }
}

export const metaverseSettlementPipelineService =
  new MetaverseSettlementPipelineService();

