// GRU Risk Management Service
// GRU Banking Operations Manual - Risk Management Protocols

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { sriMonitorService } from '@/core/risk/sri/sri-monitor.service';
import { gruAriIntegrationService } from './gru-ari-integration.service';


export interface DailyRiskControlsRequest {
  controlDate?: Date;
}

export interface VolatilityScreeningRequest {
  screeningDate?: Date;
  indexCode?: string;
}

export interface SovereignCorrelationRequest {
  correlationDate?: Date;
  sovereignBankId1?: string;
  sovereignBankId2?: string;
}

export interface FxCorridorMonitoringRequest {
  monitoringDate?: Date;
  currencyPair?: string;
}

export interface SyntheticMarketStressRequest {
  flagDate?: Date;
  marketType?: string;
}

export interface RiskControlResult {
  controlId: string;
  controlType: string;
  controlStatus: string;
  controlResult?: any;
}

export class GruRiskManagementService {
  /**
   * Run daily risk controls
   */
  async runDailyRiskControls(
    request?: DailyRiskControlsRequest
  ): Promise<RiskControlResult[]> {
    const controlDate = request?.controlDate || new Date();
    const results: RiskControlResult[] = [];

    try {
      // 1. Metal-index volatility screening
      const volatilityResult = await this.screenVolatility({
        screeningDate: controlDate,
      });
      results.push(volatilityResult);

      // 2. Sovereign correlation checks
      const correlationResult = await this.checkSovereignCorrelation({
        correlationDate: controlDate,
      });
      results.push(correlationResult);

      // 3. FX corridor monitoring
      const fxCorridorResult = await this.monitorFxCorridor({
        monitoringDate: controlDate,
      });
      results.push(fxCorridorResult);

      // 4. Synthetic market stress flags
      const stressFlagResult = await this.flagSyntheticMarketStress({
        flagDate: controlDate,
      });
      results.push(stressFlagResult);

      return results;
    } catch (error: any) {
      throw new Error(`Daily risk controls failed: ${error.message}`);
    }
  }

  /**
   * Screen metal-index volatility
   */
  async screenVolatility(
    request?: VolatilityScreeningRequest
  ): Promise<RiskControlResult> {
    const screeningDate = request?.screeningDate || new Date();
    const indexCode = request?.indexCode || 'LiXAU';
    const controlId = `GRU-RISK-VOL-${uuidv4()}`;

    try {
      // Get index price history
      const history = await prisma.gruIndexPriceHistory.findMany({
        where: {
          indexCode,
          timestamp: {
            gte: new Date(screeningDate.getTime() - 30 * 24 * 60 * 60 * 1000), // Last 30 days
          },
        },
        orderBy: { timestamp: 'desc' },
        take: 30,
      });

      if (history.length < 2) {
        throw new Error('Insufficient history for volatility screening');
      }

      // Calculate volatility
      const values = history.map((h) => parseFloat(h.indexValue.toString()));
      const avg = values.reduce((a, b) => a + b, 0) / values.length;
      const variance = values.reduce((sum, val) => sum + Math.pow(val - avg, 2), 0) / values.length;
      const stdDev = Math.sqrt(variance);
      const volatility = (stdDev / avg) * 100;

      const volatilityLevel = new Decimal(volatility);
      const threshold = new Decimal(10); // 10% threshold
      const volatilityStatus = volatilityLevel.gt(threshold) ? 'critical' : volatilityLevel.gt(threshold.dividedBy(2)) ? 'elevated' : 'normal';

      // Create screening record
      const screening = await prisma.gruVolatilityScreening.create({
        data: {
          screeningId: `GRU-VOL-SCREEN-${uuidv4()}`,
          screeningDate,
          indexCode,
          volatilityLevel,
          volatilityStatus,
          threshold,
        },
      });

      // Create risk control record
      const control = await prisma.gruRiskControl.create({
        data: {
          controlId,
          controlDate: screeningDate,
          controlType: 'daily_volatility_screening',
          controlStatus: volatilityStatus === 'normal' ? 'passed' : volatilityStatus === 'elevated' ? 'warning' : 'failed',
          controlResult: {
            indexCode,
            volatilityLevel: volatilityLevel.toString(),
            threshold: threshold.toString(),
            status: volatilityStatus,
          },
        },
      });

      return {
        controlId,
        controlType: 'daily_volatility_screening',
        controlStatus: control.controlStatus,
        controlResult: control.controlResult,
      };
    } catch (error: any) {
      throw new Error(`Volatility screening failed: ${error.message}`);
    }
  }

  /**
   * Check sovereign correlation
   */
  async checkSovereignCorrelation(
    request?: SovereignCorrelationRequest
  ): Promise<RiskControlResult> {
    const correlationDate = request?.correlationDate || new Date();
    const controlId = `GRU-RISK-CORR-${uuidv4()}`;

    try {
      // Get all sovereign banks
      const sovereignBanks = await prisma.sovereignBank.findMany({
        where: { status: 'active' },
      });

      let maxCorrelation = new Decimal(0);
      let maxPair: { bank1: string; bank2: string } | null = null;

      // Calculate correlations between pairs
      for (let i = 0; i < sovereignBanks.length; i++) {
        for (let j = i + 1; j < sovereignBanks.length; j++) {
          const bank1 = sovereignBanks[i];
          const bank2 = sovereignBanks[j];

          // Get SRI scores for both banks
          const sri1 = await sriMonitorService.monitorSRI(bank1.id);
          const sri2 = await sriMonitorService.monitorSRI(bank2.id);

          // Simple correlation: inverse of SRI difference (closer SRI = higher correlation)
          const sriDiff = Math.abs(sri1.currentSRI - sri2.currentSRI);
          const correlation = new Decimal(1 - sriDiff / 100); // Normalize to -1 to 1

          if (correlation.gt(maxCorrelation)) {
            maxCorrelation = correlation;
            maxPair = { bank1: bank1.id, bank2: bank2.id };
          }

          // Create correlation record
          await prisma.gruSovereignCorrelation.create({
            data: {
              correlationId: `GRU-CORR-${uuidv4()}`,
              correlationDate,
              sovereignBankId1: bank1.id,
              sovereignBankId2: bank2.id,
              correlationValue: correlation,
              correlationStatus: correlation.gt(0.8) ? 'critical' : correlation.gt(0.6) ? 'elevated' : 'normal',
            },
          });
        }
      }

      const controlStatus = maxCorrelation.gt(0.8) ? 'failed' : maxCorrelation.gt(0.6) ? 'warning' : 'passed';

      // Create risk control record
      const control = await prisma.gruRiskControl.create({
        data: {
          controlId,
          controlDate: correlationDate,
          controlType: 'sovereign_correlation',
          controlStatus,
          controlResult: {
            maxCorrelation: maxCorrelation.toString(),
            maxPair,
            totalPairs: (sovereignBanks.length * (sovereignBanks.length - 1)) / 2,
          },
        },
      });

      return {
        controlId,
        controlType: 'sovereign_correlation',
        controlStatus: control.controlStatus,
        controlResult: control.controlResult,
      };
    } catch (error: any) {
      throw new Error(`Sovereign correlation check failed: ${error.message}`);
    }
  }

  /**
   * Monitor FX corridor
   */
  async monitorFxCorridor(
    request?: FxCorridorMonitoringRequest
  ): Promise<RiskControlResult> {
    const monitoringDate = request?.monitoringDate || new Date();
    const currencyPair = request?.currencyPair || 'GRU/USD';
    const controlId = `GRU-RISK-FX-${uuidv4()}`;

    try {
      // Get current FX rate (would come from FX service in production)
      // For now, we'll use a placeholder
      const currentRate = new Decimal(1.0); // Placeholder
      const upperBound = new Decimal(1.1); // 10% upper bound
      const lowerBound = new Decimal(0.9); // 10% lower bound

      let corridorStatus = 'within';
      if (currentRate.gt(upperBound)) {
        corridorStatus = 'upper_breach';
      } else if (currentRate.lt(lowerBound)) {
        corridorStatus = 'lower_breach';
      }

      // Create FX corridor record
      const corridor = await prisma.gruFxCorridor.create({
        data: {
          corridorId: `GRU-FX-CORR-${uuidv4()}`,
          monitoringDate,
          currencyPair,
          currentRate,
          upperBound,
          lowerBound,
          corridorStatus,
        },
      });

      const controlStatus = corridorStatus === 'within' ? 'passed' : 'failed';

      // Create risk control record
      const control = await prisma.gruRiskControl.create({
        data: {
          controlId,
          controlDate: monitoringDate,
          controlType: 'fx_corridor',
          controlStatus,
          controlResult: {
            currencyPair,
            currentRate: currentRate.toString(),
            upperBound: upperBound.toString(),
            lowerBound: lowerBound.toString(),
            status: corridorStatus,
          },
        },
      });

      return {
        controlId,
        controlType: 'fx_corridor',
        controlStatus: control.controlStatus,
        controlResult: control.controlResult,
      };
    } catch (error: any) {
      throw new Error(`FX corridor monitoring failed: ${error.message}`);
    }
  }

  /**
   * Flag synthetic market stress
   */
  async flagSyntheticMarketStress(
    request?: SyntheticMarketStressRequest
  ): Promise<RiskControlResult> {
    const flagDate = request?.flagDate || new Date();
    const marketType = request?.marketType || 'synthetic_derivatives';
    const controlId = `GRU-RISK-STRESS-${uuidv4()}`;

    try {
      // Check for synthetic market stress indicators
      // In production, this would analyze synthetic market data
      const stressLevel = 'normal'; // Placeholder
      const flagReason = 'No significant stress detected';

      // Create synthetic market flag
      const flag = await prisma.gruSyntheticMarketFlag.create({
        data: {
          flagId: `GRU-STRESS-FLAG-${uuidv4()}`,
          flagDate,
          marketType,
          stressLevel,
          flagReason,
          status: 'active',
        },
      });

      const controlStatus = stressLevel === 'normal' ? 'passed' : stressLevel === 'elevated' ? 'warning' : 'failed';

      // Create risk control record
      const control = await prisma.gruRiskControl.create({
        data: {
          controlId,
          controlDate: flagDate,
          controlType: 'synthetic_market_stress',
          controlStatus,
          controlResult: {
            marketType,
            stressLevel,
            flagReason,
          },
        },
      });

      return {
        controlId,
        controlType: 'synthetic_market_stress',
        controlStatus: control.controlStatus,
        controlResult: control.controlResult,
      };
    } catch (error: any) {
      throw new Error(`Synthetic market stress flagging failed: ${error.message}`);
    }
  }

  /**
   * Integrate with SARE (Sovereign AI Risk Engine)
   */
  async integrateWithSARE(sovereignBankId: string): Promise<{
    sri: number;
    rating: string;
    triggers: string[];
  }> {
    try {
      return await sriMonitorService.monitorSRI(sovereignBankId);
    } catch (error: any) {
      throw new Error(`SARE integration failed: ${error.message}`);
    }
  }

  /**
   * Integrate with ARI (Autonomous Regulatory Intelligence)
   */
  async integrateWithARI(poolId?: string, entityId?: string): Promise<any> {
    try {
      return await gruAriIntegrationService.ensureCompliance(poolId, entityId);
    } catch (error: any) {
      throw new Error(`ARI integration failed: ${error.message}`);
    }
  }

  /**
   * Integrate with Q-Guard (Quantum Drift Sentinel)
   */
  async integrateWithQGuard(): Promise<{
    quantumDrift: number;
    status: string;
  }> {
    try {
      // Q-Guard integration would monitor quantum drift
      // For now, return placeholder
      return {
        quantumDrift: 0,
        status: 'stable',
      };
    } catch (error: any) {
      throw new Error(`Q-Guard integration failed: ${error.message}`);
    }
  }
}

export const gruRiskManagementService = new GruRiskManagementService();

