// AIFX Pricing Service
// Lag-adjusted pricing with gravity/latency factors

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { AifxCorridorService } from './aifx-corridor.service';

const corridorService = new AifxCorridorService();

export interface PricingRequest {
  corridorId: string;
  baseAmount: string;
  pricingMethod?: string; // nce, caso, hybrid
}

export interface PricingResult {
  fxPrice: string;
  liquidityWeight: string;
  gravityFactor: string;
  latencyCost: string;
  timeDilationIndex: string;
  ssuStability?: string;
  totalPrice: string;
}

export class AifxPricingService {
  /**
   * Calculate FX price for interplanetary trade
   * fx_price = liquidity_weight + gravity_factor + latency_cost + time_dilation_index + SSU_stability
   */
  async calculateFxPrice(request: PricingRequest): Promise<PricingResult> {
    const corridor = await prisma.aifxCorridor.findUnique({
      where: { corridorId: request.corridorId },
    });

    if (!corridor) {
      throw new Error(`Corridor not found: ${request.corridorId}`);
    }

    // Get base market price (would integrate with FX service in production)
    const baseFxPrice = await this.getBaseMarketPrice(
      corridor.baseCurrency,
      corridor.quoteCurrency
    );

    // Calculate liquidity weight
    const liquidityWeight = await this.calculateLiquidityWeight(
      corridor.baseCurrency,
      corridor.quoteCurrency
    );

    // Get gravity factor from corridor
    const gravityFactor = corridor.gravityFactor;

    // Calculate latency cost based on corridor lag adjustment
    const latencyCost = baseFxPrice.mul(
      corridor.lagAdjustment.minus(new Decimal(1))
    );

    // Calculate time-dilation index (simplified - would use actual physics in production)
    const timeDilationIndex = await this.calculateTimeDilationIndex(
      corridor.originPlanet,
      corridor.destinationPlanet
    );

    // Get SSU stability (if available)
    const ssuStability = await this.getSsuStability(
      corridor.baseCurrency,
      corridor.quoteCurrency
    );

    // Calculate total FX price
    const totalPrice = baseFxPrice
      .plus(liquidityWeight)
      .plus(gravityFactor)
      .plus(latencyCost)
      .plus(timeDilationIndex)
      .plus(ssuStability || new Decimal(0));

    // Create pricing state record
    const pricingId = `AIFX-PRICE-${uuidv4()}`;
    await prisma.aifxPricingState.create({
      data: {
        pricingId,
        corridorId: request.corridorId,
        fxPrice: totalPrice,
        liquidityWeight,
        gravityFactor,
        latencyCost,
        timeDilationIndex,
        ssuStability: ssuStability || null,
        pricingMethod: request.pricingMethod || 'hybrid',
        calculatedAt: new Date(),
      },
    });

    return {
      fxPrice: totalPrice.toString(),
      liquidityWeight: liquidityWeight.toString(),
      gravityFactor: gravityFactor.toString(),
      latencyCost: latencyCost.toString(),
      timeDilationIndex: timeDilationIndex.toString(),
      ssuStability: ssuStability?.toString(),
      totalPrice: totalPrice.toString(),
    };
  }

  /**
   * Get base market price for currency pair
   */
  private async getBaseMarketPrice(
    baseCurrency: string,
    quoteCurrency: string
  ): Promise<Decimal> {
    // In production, this would query the FX service
    // For now, return a default rate based on currency pair
    const mockRates: Record<string, string> = {
      'USD/LUN': '6.0', // 1 USD = 6 Luna Credits
      'USD/MRS': '3.5', // 1 USD = 3.5 Mars Credits
      'MRS/LUN': '1.7', // 1 Mars Credit = 1.7 Luna Credits
    };

    const pair = `${baseCurrency}/${quoteCurrency}`;
    const rate = mockRates[pair] || '1.0';

    return new Decimal(rate);
  }

  /**
   * Calculate liquidity weight
   */
  private async calculateLiquidityWeight(
    baseCurrency: string,
    quoteCurrency: string
  ): Promise<Decimal> {
    // In production, this would query liquidity pools
    // For now, return a small liquidity adjustment
    return new Decimal(0.001); // 0.1% liquidity weight
  }

  /**
   * Calculate time-dilation index
   */
  private async calculateTimeDilationIndex(
    originPlanet: string,
    destinationPlanet: string
  ): Promise<Decimal> {
    // Simplified time-dilation calculation
    // In production, would use actual relativistic physics
    const planetGravities: Record<string, number> = {
      Earth: 1.0,
      Luna: 0.166,
      Mars: 0.378,
    };

    const originG = planetGravities[originPlanet] || 1.0;
    const destG = planetGravities[destinationPlanet] || 1.0;

    // Time dilation factor (simplified)
    const dilationFactor = Math.abs(originG - destG) * 0.0001;

    return new Decimal(dilationFactor);
  }

  /**
   * Get SSU stability value
   */
  private async getSsuStability(
    baseCurrency: string,
    quoteCurrency: string
  ): Promise<Decimal | null> {
    // In production, would query SSU stability from Volume III
    // For now, return null (optional component)
    return null;
  }

  /**
   * Get latest pricing state for a corridor
   */
  async getLatestPricing(corridorId: string): Promise<PricingResult | null> {
    const pricing = await prisma.aifxPricingState.findFirst({
      where: { corridorId },
      orderBy: { calculatedAt: 'desc' },
    });

    if (!pricing) {
      return null;
    }

    return {
      fxPrice: pricing.fxPrice.toString(),
      liquidityWeight: pricing.liquidityWeight.toString(),
      gravityFactor: pricing.gravityFactor.toString(),
      latencyCost: pricing.latencyCost.toString(),
      timeDilationIndex: pricing.timeDilationIndex.toString(),
      ssuStability: pricing.ssuStability?.toString(),
      totalPrice: pricing.fxPrice.toString(),
    };
  }
}

