// Ω-Layer Finality Service
// Finality verification for bond settlements

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { logger } from '@/infrastructure/monitoring/logger';
import { createHash } from 'crypto';


export interface OmegaLayerVerificationRequest {
  settlementId: string;
  gasSettlementId: string;
  bondId?: string;
  syntheticBondId?: string;
  realityStates?: {
    classical?: any;
    quantum?: any;
    parallel?: any;
    holographic?: any;
  };
}

export interface OmegaLayerVerificationResult {
  hash: string;
  finality: boolean;
  realityConsensus: boolean;
  verifiedAt: Date;
}

export class OmegaLayerService {
  /**
   * Verify finality for bond settlement
   */
  async verifyFinality(request: OmegaLayerVerificationRequest): Promise<OmegaLayerVerificationResult> {
    logger.info('Ω-Layer: Verifying finality', { request });

    // Get settlement data
    const settlement = await prisma.gruBondSettlement.findUnique({
      where: { settlementId: request.settlementId },
    });

    if (!settlement) {
      throw new Error(`Settlement not found: ${request.settlementId}`);
    }

    // Verify GAS settlement
    const gasSettlement = await prisma.atomicSettlement.findFirst({
      where: { settlementId: request.gasSettlementId },
    });

    if (!gasSettlement || gasSettlement.status !== 'settled') {
      throw new Error(`GAS settlement not found or not settled: ${request.gasSettlementId}`);
    }

    // Check reality consensus
    const realityConsensus = await this.checkRealityConsensus(request);

    // Generate finality hash
    const finalityHash = this.generateFinalityHash(settlement, gasSettlement, realityConsensus);

    // Determine finality
    const finality = gasSettlement.status === 'settled' && realityConsensus;

    const result: OmegaLayerVerificationResult = {
      hash: finalityHash,
      finality,
      realityConsensus,
      verifiedAt: new Date(),
    };

    logger.info('Ω-Layer: Finality verified', { settlementId: request.settlementId, finality });

    return result;
  }

  /**
   * Check reality consensus
   */
  private async checkRealityConsensus(request: OmegaLayerVerificationRequest): Promise<boolean> {
    // In production, would check all reality states
    // For now, simplified check

    if (!request.realityStates) {
      // If no reality states provided, assume consensus
      return true;
    }

    // Check if all provided reality states agree
    const states = [
      request.realityStates.classical,
      request.realityStates.quantum,
      request.realityStates.parallel,
      request.realityStates.holographic,
    ].filter((s) => s !== undefined);

    if (states.length === 0) {
      return true;
    }

    // Simplified: check if states are consistent
    // In production, would perform detailed state comparison
    return true;
  }

  /**
   * Generate finality hash
   */
  private generateFinalityHash(settlement: any, gasSettlement: any, realityConsensus: boolean): string {
    const data = {
      settlementId: settlement.settlementId,
      gasSettlementId: gasSettlement.settlementId,
      bondId: settlement.bondId,
      syntheticBondId: settlement.syntheticBondId,
      amount: settlement.amount.toString(),
      realityConsensus,
      timestamp: new Date().toISOString(),
    };

    return createHash('sha256').update(JSON.stringify(data)).digest('hex');
  }

  /**
   * Merge reality states
   */
  async mergeRealityStates(bondId: string): Promise<Record<string, any>> {
    logger.info('Ω-Layer: Merging reality states', { bondId });

    // Get classical state
    const classicalState = await prisma.gruBond.findUnique({
      where: { bondId },
    });

    // Get quantum state
    const quantumState = await prisma.quantumBond.findFirst({
      where: { bondId },
    });

    // Get parallel state (simplified - would use parallel reality service)
    const parallelState = null;

    // Get holographic state (simplified - would use holographic service)
    const holographicState = null;

    // Merge states
    const mergedState = {
      classical: classicalState,
      quantum: quantumState,
      parallel: parallelState,
      holographic: holographicState,
      merged: {
        principalAmount: classicalState?.principalAmount || null,
        status: classicalState?.status || 'unknown',
        mergedAt: new Date(),
      },
    };

    logger.info('Ω-Layer: Reality states merged', { bondId });

    return mergedState;
  }

  /**
   * Get finality verification
   */
  async getFinalityVerification(settlementId: string) {
    const settlement = await prisma.gruBondSettlement.findUnique({
      where: { settlementId },
    });

    if (!settlement) {
      return null;
    }

    return {
      settlementId: settlement.settlementId,
      omegaLayerHash: settlement.omegaLayerHash,
      primeLedgerHash: settlement.primeLedgerHash,
      status: settlement.status,
      omegaCompletedAt: settlement.omegaCompletedAt,
    };
  }
}

export const omegaLayerService = new OmegaLayerService();

