// GRU Chrono-FX Service
// Time-dilation FX for interplanetary CBDC

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


export interface ChronoFxRequest {
  settlementId: string;
  sourceCurrency: string;
  targetCurrency: string;
  baseRate: string;
  delaySeconds?: number; // Transmission delay for interplanetary
  calculationMethod?: 'time_dilation' | 'interplanetary' | 'relativistic';
}

export interface ChronoFxResult {
  chronoFxId: string;
  sourceCurrency: string;
  targetCurrency: string;
  baseRate: Decimal;
  timeDilation: Decimal;
  adjustedRate: Decimal;
  relativityFactor?: Decimal;
  status: string;
}

export class GruChronoFxService {
  /**
   * Calculate time-dilation FX rate
   * Used for interplanetary CBDC and relativistic settlement differences
   */
  async calculateChronoFx(
    request: ChronoFxRequest
  ): Promise<ChronoFxResult> {
    logger.info('GRU Chrono-FX: Calculating chrono-FX rate', { request });

    const chronoFxId = `GRU-CHRONO-FX-${uuidv4()}`;
    const baseRate = new Decimal(request.baseRate);
    const calculationMethod =
      request.calculationMethod || 'interplanetary';

    let timeDilation: Decimal;
    let adjustedRate: Decimal;
    let relativityFactor: Decimal | undefined;

    switch (calculationMethod) {
      case 'time_dilation':
        // Time dilation adjustment for relativistic effects
        timeDilation = this.calculateTimeDilation(request.delaySeconds || 0);
        adjustedRate = baseRate.times(timeDilation);
        break;

      case 'interplanetary':
        // Interplanetary FX adjustment for long transmission delays
        timeDilation = this.calculateInterplanetaryTimeDilation(
          request.delaySeconds || 0
        );
        adjustedRate = baseRate.times(timeDilation);
        break;

      case 'relativistic':
        // Full relativistic adjustment
        const relativisticResult = this.calculateRelativisticFx(
          baseRate,
          request.delaySeconds || 0
        );
        timeDilation = relativisticResult.timeDilation;
        adjustedRate = relativisticResult.adjustedRate;
        relativityFactor = relativisticResult.relativityFactor;
        break;

      default:
        timeDilation = new Decimal(1);
        adjustedRate = baseRate;
    }

    // Create chrono-FX record
    const chronoFx = await prisma.gruChronoFx.create({
      data: {
        chronoFxId,
        settlementId: request.settlementId,
        sourceCurrency: request.sourceCurrency,
        targetCurrency: request.targetCurrency,
        baseRate,
        timeDilation,
        delaySeconds: request.delaySeconds || null,
        adjustedRate,
        relativityFactor,
        calculationMethod,
        status: 'calculated',
      },
    });

    logger.info('GRU Chrono-FX: Chrono-FX calculated', {
      chronoFxId,
      baseRate: baseRate.toString(),
      adjustedRate: adjustedRate.toString(),
      timeDilation: timeDilation.toString(),
    });

    return {
      chronoFxId,
      sourceCurrency: request.sourceCurrency,
      targetCurrency: request.targetCurrency,
      baseRate,
      timeDilation,
      adjustedRate,
      relativityFactor,
      status: 'calculated',
    };
  }

  /**
   * Calculate time dilation factor
   * Formula: γ = 1 / sqrt(1 - v²/c²)
   * Simplified for financial transactions
   */
  private calculateTimeDilation(delaySeconds: number): Decimal {
    // For financial transactions, time dilation is minimal
    // Use delay-based adjustment instead
    // In production, would use actual relativistic calculations

    // Time dilation factor based on delay
    // Longer delays have more time dilation effect
    const delayHours = delaySeconds / 3600;
    const timeDilationFactor = new Decimal(1)
      .plus(new Decimal(delayHours).times(0.00001)); // Minimal adjustment

    return timeDilationFactor;
  }

  /**
   * Calculate interplanetary time dilation
   * Accounts for long transmission delays between planets
   */
  private calculateInterplanetaryTimeDilation(delaySeconds: number): Decimal {
    // Interplanetary delays can be significant (minutes to hours)
    // Earth to Moon: ~1.3 seconds
    // Earth to Mars: ~3-22 minutes (depending on distance)
    // Earth to Jupiter: ~35-52 minutes

    const delayMinutes = delaySeconds / 60;

    // Time dilation increases with delay
    // Use exponential adjustment for longer delays
    const dilationFactor = new Decimal(1)
      .plus(
        new Decimal(delayMinutes)
          .times(0.001) // 0.1% per minute
          .dividedBy(60) // Normalize to hours
      );

    return dilationFactor;
  }

  /**
   * Calculate relativistic FX adjustment
   * Full relativistic calculation including velocity and gravitational effects
   */
  private calculateRelativisticFx(
    baseRate: Decimal,
    delaySeconds: number
  ): {
    timeDilation: Decimal;
    adjustedRate: Decimal;
    relativityFactor: Decimal;
  } {
    // Speed of light: c = 299,792,458 m/s
    const c = new Decimal(299792458);

    // Assume transmission speed (e.g., radio waves at speed of light)
    // For financial data, typically transmitted at near light speed
    const transmissionSpeed = c.times(new Decimal(0.99)); // 99% of light speed

    // Calculate velocity factor
    const v = transmissionSpeed;
    const vSquared = v.pow(2);
    const cSquared = c.pow(2);
    const ratio = vSquared.dividedBy(cSquared);

    // Lorentz factor: γ = 1 / sqrt(1 - v²/c²)
    const oneMinusRatio = new Decimal(1).minus(ratio);
    const sqrt = oneMinusRatio.sqrt();
    const lorentzFactor = new Decimal(1).dividedBy(sqrt);

    // Time dilation based on delay
    const delayAdjustment = this.calculateInterplanetaryTimeDilation(
      delaySeconds
    );

    // Combined time dilation
    const timeDilation = lorentzFactor.times(delayAdjustment);

    // Adjusted rate
    const adjustedRate = baseRate.times(timeDilation);

    // Relativity factor (ratio of time dilation to base)
    const relativityFactor = timeDilation.minus(new Decimal(1));

    return {
      timeDilation,
      adjustedRate,
      relativityFactor,
    };
  }

  /**
   * Get chrono-FX by ID
   */
  async getChronoFx(chronoFxId: string) {
    return await prisma.gruChronoFx.findUnique({
      where: { chronoFxId },
      include: {
        settlement: true,
      },
    });
  }

  /**
   * Get chrono-FX for settlement
   */
  async getChronoFxForSettlement(settlementId: string) {
    return await prisma.gruChronoFx.findMany({
      where: { settlementId },
      orderBy: { createdAt: 'desc' },
    });
  }

  /**
   * Calculate delay for interplanetary transmission
   * Returns delay in seconds based on distance
   */
  calculateInterplanetaryDelay(
    sourcePlanet: string,
    targetPlanet: string
  ): number {
    // Distances in light-seconds (approximate)
    const distances: Record<string, Record<string, number>> = {
      Earth: {
        Moon: 1.3,
        Mars: 180, // 3-22 minutes depending on position
        Jupiter: 2100, // 35-52 minutes
        Saturn: 4200, // 70-80 minutes
      },
      Moon: {
        Earth: 1.3,
        Mars: 180,
      },
      Mars: {
        Earth: 180,
        Moon: 180,
        Jupiter: 1800,
      },
    };

    const distance = distances[sourcePlanet]?.[targetPlanet] || 0;

    // Convert to seconds (already in light-seconds)
    return Math.round(distance);
  }
}

export const gruChronoFxService = new GruChronoFxService();

