// BEIE Metrics Service
// CCV, ILB, SRP calculation

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


export interface CalculateMetricRequest {
  entityId: string;
  entityType: string; // retail_cbdc_user, institution, sovereign_liquidity_actor
  metricType: string; // ccv, ilb, srp
}

export interface MetricResult {
  metricId: string;
  metricValue: string;
  metricType: string;
}

export class BeieMetricsService {
  /**
   * Calculate behavioral metric
   */
  async calculateMetric(request: CalculateMetricRequest): Promise<MetricResult> {
    let metricValue: Decimal;

    switch (request.metricType) {
      case 'ccv':
        metricValue = await this.calculateCCV(request.entityId, request.entityType);
        break;
      case 'ilb':
        metricValue = await this.calculateILB(request.entityId, request.entityType);
        break;
      case 'srp':
        metricValue = await this.calculateSRP(request.entityId, request.entityType);
        break;
      default:
        throw new Error(`Unknown metric type: ${request.metricType}`);
    }

    const metricId = `BEIE-METRIC-${uuidv4()}`;

    await prisma.behavioral_metrics.create({
      data: {
        id: uuidv4(),
        metricId,
        entityId: request.entityId,
        entityType: request.entityType,
        metricType: request.metricType,
        metricValue,
        calculatedAt: new Date(),
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });

    return {
      metricId,
      metricValue: metricValue.toString(),
      metricType: request.metricType,
    };
  }

  /**
   * Calculate Consumer CBDC Velocity (CCV)
   * Tracks spending patterns
   */
  private async calculateCCV(entityId: string, entityType: string): Promise<Decimal> {
    // In production, this would analyze actual CBDC transaction data
    // For now, return a simulated value based on entity type
    if (entityType !== 'retail_cbdc_user') {
      return new Decimal(0);
    }

    // Simulate CCV calculation (would use real transaction data)
    // CCV = total_spending / time_period / average_balance
    const simulatedCCV = 0.5 + Math.random() * 0.5; // 0.5 to 1.0
    return new Decimal(simulatedCCV);
  }

  /**
   * Calculate Institutional Liquidity Behavior (ILB)
   * Predicts institutional hoarding or dumping
   */
  private async calculateILB(entityId: string, entityType: string): Promise<Decimal> {
    // In production, this would analyze institutional liquidity patterns
    if (entityType !== 'institution') {
      return new Decimal(0);
    }

    // Simulate ILB calculation
    // ILB = liquidity_velocity / liquidity_holdings_ratio
    // Positive = hoarding, Negative = dumping
    const simulatedILB = -0.3 + Math.random() * 0.6; // -0.3 to 0.3
    return new Decimal(simulatedILB);
  }

  /**
   * Calculate Sovereign Reaction Profile (SRP)
   * Forecasts SCB responses to shocks
   */
  private async calculateSRP(entityId: string, entityType: string): Promise<Decimal> {
    // In production, this would use historical SCB response data
    if (entityType !== 'sovereign_liquidity_actor') {
      return new Decimal(0);
    }

    // Simulate SRP calculation
    // SRP = reaction_speed * intervention_probability * policy_effectiveness
    const simulatedSRP = 0.3 + Math.random() * 0.4; // 0.3 to 0.7
    return new Decimal(simulatedSRP);
  }

  /**
   * Get latest metric for entity
   */
  async getLatestMetric(entityId: string, metricType: string) {
    return await prisma.behavioral_metrics.findFirst({
      where: {
        entityId,
        metricType,
      },
      orderBy: { calculatedAt: 'desc' },
    });
  }

  /**
   * Get all metrics for entity
   */
  async getMetrics(entityId: string) {
    return await prisma.behavioral_metrics.findMany({
      where: { entityId },
      orderBy: { calculatedAt: 'desc' },
    });
  }
}

export const beieMetricsService = new BeieMetricsService();

