// ISRM Stability Service
// Cross-state variance minimization and arbitrage

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { IsrmReserveService } from './isrm-reserve.service';

const reserveService = new IsrmReserveService();

export interface StabilityResult {
  reserveId: string;
  variance: string;
  varianceReduction: string;
  arbitrageOpportunities: number;
}

export class IsrmStabilityService {
  /**
   * Minimize cross-state variance
   */
  async minimizeVariance(reserveId: string): Promise<StabilityResult> {
    const reserve = await prisma.infiniteStateReserve.findUnique({
      where: { reserveId },
      include: {
        quantumStates: true,
        parallelBranches: true,
        temporalFutures: true,
      },
    });

    if (!reserve) {
      throw new Error(`Reserve not found: ${reserveId}`);
    }

    const beforeVariance = reserve.variance || new Decimal(0);

    // Collect all reserve values
    const reserves: Decimal[] = [
      reserve.classicalReserve,
      reserve.quantumReserve || new Decimal(0),
      reserve.parallelReserve || new Decimal(0),
      reserve.holographicReserve || new Decimal(0),
      reserve.temporalReserve || new Decimal(0),
    ].filter(r => !r.equals(0));

    if (reserves.length === 0) {
      return {
        reserveId,
        variance: '0',
        varianceReduction: '0',
        arbitrageOpportunities: 0,
      };
    }

    // Calculate mean
    const total = reserves.reduce((sum, r) => sum.plus(r), new Decimal(0));
    const mean = total.div(reserves.length);

    // Calculate variance
    const sumSquaredDiffs = reserves.reduce((sum, r) => {
      const diff = r.minus(mean);
      return sum.plus(diff.pow(2));
    }, new Decimal(0));
    const variance = sumSquaredDiffs.div(reserves.length);

    // Perform arbitrage compression (simplified)
    // In production, this would execute actual arbitrage trades
    const arbitrageOpportunities = await this.detectArbitrageOpportunities(reserveId);

    // Update reserve variance
    await prisma.infiniteStateReserve.update({
      where: { reserveId },
      data: {
        variance,
        calculatedAt: new Date(),
      },
    });

    const varianceReduction = beforeVariance.minus(variance);

    return {
      reserveId,
      variance: variance.toString(),
      varianceReduction: varianceReduction.toString(),
      arbitrageOpportunities,
    };
  }

  /**
   * Detect arbitrage opportunities across states
   */
  private async detectArbitrageOpportunities(reserveId: string): Promise<number> {
    const reserve = await prisma.infiniteStateReserve.findUnique({
      where: { reserveId },
      include: {
        quantumStates: true,
        parallelBranches: true,
      },
    });

    if (!reserve) {
      return 0;
    }

    // Simplified arbitrage detection
    // In production, would compare prices across quantum/parallel states
    let opportunities = 0;

    // Check quantum states for arbitrage
    if (reserve.quantumStates.length > 0) {
      // Compare quantum state values for price differences
      opportunities += reserve.quantumStates.length - 1;
    }

    // Check parallel branches for arbitrage
    if (reserve.parallelBranches.length > 1) {
      // Compare parallel branch prices
      opportunities += reserve.parallelBranches.length - 1;
    }

    return opportunities;
  }

  /**
   * Execute multiversal arbitrage compression
   */
  async executeArbitrageCompression(reserveId: string): Promise<void> {
    // This would execute actual arbitrage trades to compress variance
    // For now, just minimize variance
    await this.minimizeVariance(reserveId);
  }

  /**
   * Reduce quantum entropy
   */
  async reduceQuantumEntropy(reserveId: string): Promise<string> {
    const reserve = await prisma.infiniteStateReserve.findUnique({
      where: { reserveId },
      include: {
        quantumStates: true,
      },
    });

    if (!reserve || !reserve.quantumReserve) {
      return '0';
    }

    // Calculate quantum entropy based on quantum states
    // Simplified entropy calculation
    const numStates = reserve.quantumStates.length;
    if (numStates === 0) {
      return '0';
    }

    // Entropy = -Σ(p_i * log2(p_i))
    // For simplicity, assume uniform distribution
    const probability = new Decimal(1).div(numStates);
    const entropy = new Decimal(numStates).mul(
      probability.mul(
        new Decimal(2).log().mul(probability.abs().log()).div(new Decimal(2).log())
      )
    ).abs();

    // Update reserve entropy
    await prisma.infiniteStateReserve.update({
      where: { reserveId },
      data: {
        entropy,
        calculatedAt: new Date(),
      },
    });

    return entropy.toString();
  }
}

