// Monetary Drift Correction Service
// CBDC rebalancing, SSU pressure absorption, FX corrections

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


export interface CreateDriftCorrectionRequest {
  currencyCode: string;
  assetType: string;
  driftAmount: number;
  driftType: 'market_drift' | 'fx_drift' | 'commodity_shock';
  correctionMethod: 'cbdc_rebalancing' | 'ssu_pressure_absorption' | 'fx_cost_correction';
}

export class DriftCorrectionService {
  /**
   * Create drift correction
   */
  async createCorrection(request: CreateDriftCorrectionRequest) {
    const correctionId = `DRIFT-${uuidv4()}`;

    // Calculate correction amount based on method
    let correctionAmount = new Decimal(request.driftAmount);

    // In production, this would integrate with actual systems
    switch (request.correctionMethod) {
      case 'cbdc_rebalancing':
        // Would integrate with CBDC service
        break;
      case 'ssu_pressure_absorption':
        // Would integrate with SSU service
        correctionAmount = correctionAmount.times(0.8); // SSU absorbs 80% of pressure
        break;
      case 'fx_cost_correction':
        // Would integrate with FX engine
        correctionAmount = correctionAmount.times(0.9); // FX correction with 10% cost
        break;
    }

    const correction = await prisma.monetary_drift_corrections.create({
      data: {
        correctionId,
        currencyCode: request.currencyCode,
        assetType: request.assetType,
        driftAmount: new Decimal(request.driftAmount),
        driftType: request.driftType,
        correctionMethod: request.correctionMethod,
        correctionAmount,
        status: 'pending',
      },
    });

    return correction;
  }

  /**
   * Apply correction
   */
  async applyCorrection(correctionId: string) {
    const correction = await prisma.monetary_drift_corrections.findUnique({
      where: { correctionId },
    });

    if (!correction) {
      throw new Error(`Correction not found: ${correctionId}`);
    }

    if (correction.status !== 'pending') {
      throw new Error(`Correction already ${correction.status}`);
    }

    // In production, this would actually apply the correction to the relevant systems
    // For now, just mark as applied
    return prisma.monetary_drift_corrections.update({
      where: { correctionId },
      data: {
        status: 'applied',
        appliedAt: new Date(),
      },
    });
  }

  /**
   * Get correction by ID
   */
  async getCorrection(correctionId: string) {
    const correction = await prisma.monetary_drift_corrections.findUnique({
      where: { correctionId },
    });

    if (!correction) {
      throw new Error(`Correction not found: ${correctionId}`);
    }

    return correction;
  }

  /**
   * Get corrections
   */
  async getCorrections(filters?: {
    currencyCode?: string;
    assetType?: string;
    driftType?: string;
    status?: string;
  }) {
    const where: Record<string, unknown> = {};

    if (filters?.currencyCode) {
      where.currencyCode = filters.currencyCode;
    }
    if (filters?.assetType) {
      where.assetType = filters.assetType;
    }
    if (filters?.driftType) {
      where.driftType = filters.driftType;
    }
    if (filters?.status) {
      where.status = filters.status;
    }

    return prisma.monetary_drift_corrections.findMany({
      where,
      orderBy: {
        createdAt: 'desc',
      },
    });
  }

  /**
   * Detect drift and create correction
   */
  async detectAndCorrectDrift(
    currencyCode: string,
    assetType: string,
    currentValue: number,
    targetValue: number
  ) {
    const drift = currentValue - targetValue;
    const driftAmount = Math.abs(drift);

    if (driftAmount < 0.01) {
      // No significant drift
      return null;
    }

    const driftType = assetType === 'commodity' ? 'commodity_shock' : 'market_drift';
    const correctionMethod = assetType === 'cbdc' ? 'cbdc_rebalancing' : 'fx_cost_correction';

    return this.createCorrection({
      currencyCode,
      assetType,
      driftAmount,
      driftType,
      correctionMethod,
    });
  }
}

export const driftCorrectionService = new DriftCorrectionService();

