// CBDC Monetary Simulation Service
import { Prisma } from '@prisma/client';
// Simulation: impact = CBDC_supply_change * velocity_factor * FX_reserve_strength

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';


export interface MonetarySimulationRequest {
  simulationType: string;
  sovereignBankId?: string;
  supplyChange?: number;
  velocityFactor?: number;
  fxReserveStrength?: number;
}

export class CbdcMonetarySimulationService {
  /**
   * Run monetary simulation
   */
  async runSimulation(request: MonetarySimulationRequest) {
    const simulationId = `SIM-${uuidv4()}`;

    const simulation = await prisma.cbdcMonetarySimulation.create({
      data: {
        simulationId,
        sovereignBankId: request.sovereignBankId,
        simulationType: request.simulationType,
        supplyChange: request.supplyChange ? new Decimal(request.supplyChange) : null,
        velocityFactor: request.velocityFactor ? new Decimal(request.velocityFactor) : null,
        fxReserveStrength: request.fxReserveStrength ? new Decimal(request.fxReserveStrength) : null,
        status: 'running',
      },
    });

    // Calculate impact score
    const impactScore = this.calculateImpactScore(
      request.supplyChange || 0,
      request.velocityFactor || 1,
      request.fxReserveStrength || 1
    );

    // Run simulation logic based on type
    const simulationResults = await this.executeSimulation(
      request.simulationType,
      impactScore,
      request
    );

    // Update simulation with results
    await prisma.cbdcMonetarySimulation.update({
      where: { simulationId },
      data: {
        impactScore: new Decimal(impactScore),
        simulationResults: simulationResults as Prisma.InputJsonValue,
        status: 'completed',
        completedAt: new Date(),
      },
    });

    return simulation;
  }

  /**
   * Calculate impact score
   */
  private calculateImpactScore(
    supplyChange: number,
    velocityFactor: number,
    fxReserveStrength: number
  ): number {
    // impact = CBDC_supply_change * velocity_factor * FX_reserve_strength
    return supplyChange * velocityFactor * fxReserveStrength;
  }

  /**
   * Execute simulation based on type
   */
  private async executeSimulation(
    simulationType: string,
    impactScore: number,
    request: MonetarySimulationRequest
  ): Promise<Record<string, unknown>> {
    // Simulate different types
    const results: Record<string, unknown> = {
      impactScore,
      simulationType,
    };

    switch (simulationType) {
      case 'cross_border_flows':
        results.flows = {};
        break;
      case 'liquidity_shock':
        results.shockImpact = {};
        break;
      case 'fx_spillover':
        results.spilloverEffect = {};
        break;
      case 'commodity_backed_circulation':
        results.circulation = {};
        break;
    }

    return results;
  }

  /**
   * Get simulation by ID
   */
  async getSimulation(simulationId: string) {
    return await prisma.cbdcMonetarySimulation.findUnique({
      where: { simulationId },
    });
  }

  /**
   * Get simulations by type
   */
  async getSimulationsByType(simulationType: string) {
    return await prisma.cbdcMonetarySimulation.findMany({
      where: {
        simulationType,
      },
      orderBy: {
        startedAt: 'desc',
      },
    });
  }
}

export const cbdcMonetarySimulationService = new CbdcMonetarySimulationService();

