// GRU Settlement Operations Service
// GRU Banking Operations Manual - Settlement Operations (Classical → Quantum → Ω-Layer)

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { atomicSettlementService } from '@/core/settlement/isn/atomic-settlement.service';
import { gssMasterLedgerService } from '@/core/settlement/gss/gss-master-ledger.service';


export interface ClassicalSettlementRequest {
  sourceBankId: string;
  destinationBankId: string;
  amount: string;
  currencyCode: string;
  assetType?: string;
}

export interface QuantumSettlementRequest {
  sourceBankId: string;
  destinationBankId: string;
  amount: string;
  currencyCode: string;
  quantumState?: any;
}

export interface TemporalSettlementRequest {
  sourceBankId: string;
  destinationBankId: string;
  amount: string;
  currencyCode: string;
  temporalOffset: string; // t-Δ or t+Δ
}

export interface CrossRealitySettlementRequest {
  sourceBankId: string;
  destinationBankId: string;
  amount: string;
  currencyCode: string;
  realityType: 'parallel' | 'holographic';
}

export interface SettlementPipelineRequest {
  sourceBankId: string;
  destinationBankId: string;
  amount: string;
  currencyCode: string;
  assetType?: string;
}

export interface SettlementResult {
  settlementId: string;
  status: string;
  pipelineStage?: string;
}

export class GruSettlementOperationsService {
  /**
   * Execute classical settlement (SCB/RTGS)
   */
  async executeClassicalSettlement(
    request: ClassicalSettlementRequest
  ): Promise<SettlementResult> {
    try {
      // Use GSS Master Ledger for classical settlement
      const result = await gssMasterLedgerService.postToMasterLedger({
        nodeId: `GSS-NODE-${request.sourceBankId}`,
        sourceBankId: request.sourceBankId,
        destinationBankId: request.destinationBankId,
        amount: request.amount,
        currencyCode: request.currencyCode,
        assetType: request.assetType || 'fiat',
      });

      return {
        settlementId: result.entryId,
        status: 'settled',
        pipelineStage: 'classical',
      };
    } catch (error: any) {
      throw new Error(`Classical settlement failed: ${error.message}`);
    }
  }

  /**
   * Execute quantum settlement (GQL)
   */
  async executeQuantumSettlement(
    request: QuantumSettlementRequest
  ): Promise<SettlementResult> {
    const settlementId = `GRU-Q-SETTLE-${uuidv4()}`;

    try {
      // In production, this would interact with Global Quantum Ledger (GQL)
      // For now, we'll create a placeholder record
      // The actual GQL integration would use quantum-safe cryptography and quantum state management

      // Create quantum settlement record
      // In production, this would be stored in GQL
      const quantumState = request.quantumState || {
        quantumHash: `QHASH-${uuidv4()}`,
        quantumSignature: `QSIG-${uuidv4()}`,
      };

      return {
        settlementId,
        status: 'settled',
        pipelineStage: 'quantum',
      };
    } catch (error: any) {
      throw new Error(`Quantum settlement failed: ${error.message}`);
    }
  }

  /**
   * Execute temporal settlement (t−Δ / t+Δ)
   */
  async executeTemporalSettlement(
    request: TemporalSettlementRequest
  ): Promise<SettlementResult> {
    const settlementId = `GRU-T-SETTLE-${uuidv4()}`;

    try {
      // Parse temporal offset
      const offsetMatch = request.temporalOffset.match(/t([+-])(\d+)/);
      if (!offsetMatch) {
        throw new Error(`Invalid temporal offset: ${request.temporalOffset}`);
      }

      const direction = offsetMatch[1];
      const days = parseInt(offsetMatch[2], 10);

      // Calculate target date
      const targetDate = new Date();
      if (direction === '+') {
        targetDate.setDate(targetDate.getDate() + days);
      } else {
        targetDate.setDate(targetDate.getDate() - days);
      }

      // In production, this would create a temporal settlement commitment
      // For now, we'll create a placeholder
      return {
        settlementId,
        status: 'pending',
        pipelineStage: 'temporal',
      };
    } catch (error: any) {
      throw new Error(`Temporal settlement failed: ${error.message}`);
    }
  }

  /**
   * Execute cross-reality settlement (parallel/holographic)
   */
  async executeCrossRealitySettlement(
    request: CrossRealitySettlementRequest
  ): Promise<SettlementResult> {
    const settlementId = `GRU-CR-SETTLE-${uuidv4()}`;

    try {
      // In production, this would interact with multi-reality ledger systems
      // For now, we'll create a placeholder
      return {
        settlementId,
        status: 'settled',
        pipelineStage: request.realityType === 'parallel' ? 'parallel_reality' : 'holographic',
      };
    } catch (error: any) {
      throw new Error(`Cross-reality settlement failed: ${error.message}`);
    }
  }

  /**
   * Process settlement pipeline: Classical → Quantum → Ω-Layer
   */
  async processSettlementPipeline(
    request: SettlementPipelineRequest
  ): Promise<SettlementResult> {
    const pipelineId = `GRU-PIPELINE-${uuidv4()}`;

    try {
      // Create pipeline record
      const pipeline = await prisma.gruSettlementPipeline.create({
        data: {
          pipelineId,
          sourceBankId: request.sourceBankId,
          destinationBankId: request.destinationBankId,
          amount: new Decimal(request.amount),
          currencyCode: request.currencyCode,
          assetType: request.assetType || 'fiat',
          pipelineStage: 'classical',
          status: 'in_progress',
        },
      });

      // Step 1: Classical settlement (via GAS)
      const classicalResult = await this.executeClassicalSettlement({
        sourceBankId: request.sourceBankId,
        destinationBankId: request.destinationBankId,
        amount: request.amount,
        currencyCode: request.currencyCode,
        assetType: request.assetType,
      });

      // Update pipeline
      await prisma.gruSettlementPipeline.update({
        where: { pipelineId },
        data: {
          pipelineStage: 'quantum',
          gasTransactionId: classicalResult.settlementId,
        },
      });

      // Step 2: Quantum settlement (via GQL)
      const quantumResult = await this.executeQuantumSettlement({
        sourceBankId: request.sourceBankId,
        destinationBankId: request.destinationBankId,
        amount: request.amount,
        currencyCode: request.currencyCode,
      });

      // Update pipeline
      await prisma.gruSettlementPipeline.update({
        where: { pipelineId },
        data: {
          pipelineStage: 'omega_layer',
          quantumTransactionId: quantumResult.settlementId,
        },
      });

      // Step 3: Ω-Layer finality
      const omegaResult = await this.integrateWithOmegaLayer(pipelineId);

      // Update pipeline
      await prisma.gruSettlementPipeline.update({
        where: { pipelineId },
        data: {
          pipelineStage: 'completed',
          status: 'completed',
          omegaFinalityId: omegaResult.finalityId,
          completedAt: new Date(),
        },
      });

      return {
        settlementId: pipelineId,
        status: 'completed',
        pipelineStage: 'completed',
      };
    } catch (error: any) {
      // Mark pipeline as failed
      await prisma.gruSettlementPipeline.update({
        where: { pipelineId },
        data: {
          status: 'failed',
        },
      });

      throw new Error(`Settlement pipeline failed: ${error.message}`);
    }
  }

  /**
   * Integrate with GAS network
   */
  async integrateWithGAS(
    sourceBankId: string,
    destinationBankId: string,
    amount: number,
    currencyCode: string
  ): Promise<string> {
    try {
      const result = await atomicSettlementService.executeAtomicSettlement({
        sourceBankId,
        destinationBankId,
        amount,
        currencyCode,
        assetType: 'fiat',
      });

      return result.settlementId;
    } catch (error: any) {
      throw new Error(`GAS integration failed: ${error.message}`);
    }
  }

  /**
   * Integrate with Quantum Proxy Server (QPS)
   */
  async integrateWithQPS(
    transactionId: string,
    legacyProtocol: string
  ): Promise<string> {
    try {
      // In production, this would route through QPS
      // For now, return placeholder
      return `QPS-${transactionId}`;
    } catch (error: any) {
      throw new Error(`QPS integration failed: ${error.message}`);
    }
  }

  /**
   * Integrate with Ω-Layer
   */
  async integrateWithOmegaLayer(pipelineId: string): Promise<{
    finalityId: string;
    omegaLayerId: string;
  }> {
    try {
      // Get or create Omega Layer
      let omegaLayer = await prisma.omegaLayer.findFirst({
        where: { layerName: 'Ω0: Prime Ledger' },
      });

      if (!omegaLayer) {
        omegaLayer = await prisma.omegaLayer.create({
          data: {
            layerId: `OMEGA-${uuidv4()}`,
            layerName: 'Ω0: Prime Ledger',
            layerType: 'prime',
            status: 'active',
          },
        });
      }

      // Create Ω-Layer finality record
      const finality = await prisma.gruOmegaLayerFinality.create({
        data: {
          finalityId: `GRU-OMEGA-FINAL-${uuidv4()}`,
          pipelineId,
          omegaLayerId: omegaLayer.layerId,
          mergeOperationId: `MERGE-${uuidv4()}`,
          finalityProof: `PROOF-${uuidv4()}`,
          causalityStable: true,
          multiRealityReconciled: true,
          status: 'merged',
          mergedAt: new Date(),
          finalizedAt: new Date(),
        },
      });

      return {
        finalityId: finality.finalityId,
        omegaLayerId: omegaLayer.layerId,
      };
    } catch (error: any) {
      throw new Error(`Ω-Layer integration failed: ${error.message}`);
    }
  }
}

export const gruSettlementOperationsService = new GruSettlementOperationsService();

