// GRU Quantum Stress Service
// Quantum stress models (wavefunction collapse simulation)

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';
import { gruIndexService, GruIndexCode } from './gru-index.service';


export interface QuantumStressTestRequest {
  indexCode: GruIndexCode;
  quantumStates?: number; // Number of quantum states to simulate
  collapseProbability?: number; // Probability of wavefunction collapse
  parameters?: Record<string, unknown>;
}

export interface QuantumStressResult {
  testId: string;
  quantumStates: Record<string, Decimal>;
  collapsedState: Decimal;
  expectedValue: Decimal;
  variance: Decimal;
  passed: boolean;
  impactLevel: string;
}

export class GruQuantumStressService {
  /**
   * Run quantum stress test
   * Simulates GRU wavefunction collapse and quantum arbitrage suppression
   */
  async runQuantumStressTest(
    request: QuantumStressTestRequest
  ): Promise<QuantumStressResult> {
    logger.info('GRU Quantum Stress: Running quantum stress test', { request });

    const testId = `GRU-QUANTUM-STRESS-${uuidv4()}`;

    // Get current index value
    const index = await gruIndexService.getIndex(request.indexCode);
    if (!index) {
      throw new Error(`Index not found: ${request.indexCode}`);
    }

    const baseValue = index.currentValue;
    const quantumStates = request.quantumStates || 5;
    const collapseProbability = request.collapseProbability || 0.2; // 20% collapse probability

    // Generate quantum states (superposition)
    const quantumStatesMap: Record<string, Decimal> = {};
    let expectedValue = new Decimal(0);

    for (let i = 0; i < quantumStates; i++) {
      // Each quantum state has a probability amplitude
      const amplitude = new Decimal(1).dividedBy(Math.sqrt(quantumStates));
      const phase = (Math.PI * 2 * i) / quantumStates;
      const stateValue = baseValue.times(
        new Decimal(1).plus(Math.sin(phase) * 0.1) // ±10% variation
      );

      quantumStatesMap[`state_${i}`] = stateValue;
      expectedValue = expectedValue.plus(stateValue.times(amplitude.pow(2)));
    }

    // Simulate wavefunction collapse
    const collapseRandom = Math.random();
    let collapsedState = baseValue;

    if (collapseRandom < collapseProbability) {
      // Wavefunction collapses to one of the states
      const collapsedStateIndex = Math.floor(Math.random() * quantumStates);
      collapsedState = quantumStatesMap[`state_${collapsedStateIndex}`];
    } else {
      // Remains in superposition (expected value)
      collapsedState = expectedValue;
    }

    // Calculate variance
    const variance = Object.values(quantumStatesMap)
      .reduce((sum, v) => sum.plus(v.minus(expectedValue).pow(2)), new Decimal(0))
      .dividedBy(quantumStates);

    // Check if variance is acceptable
    const varianceThreshold = baseValue.times(0.05); // 5% variance threshold
    const passed = variance.lessThan(varianceThreshold);

    // Determine impact level
    let impactLevel = 'low';
    const variancePercent = variance.dividedBy(baseValue).times(100);
    if (variancePercent.greaterThan(10)) {
      impactLevel = 'critical';
    } else if (variancePercent.greaterThan(7)) {
      impactLevel = 'high';
    } else if (variancePercent.greaterThan(5)) {
      impactLevel = 'medium';
    }

    // Create test record
    const test = await prisma.gruStressTest.create({
      data: {
        testId,
        testName: `Quantum Stress Test: ${request.indexCode}`,
        stressRegime: 'quantum',
        testType: 'quantum',
        parameters: request.parameters || {},
        status: 'completed',
        completedAt: new Date(),
      },
    });

    // Save results
    await prisma.gruStressTestResult.create({
      data: {
        resultId: `GRU-RESULT-${uuidv4()}`,
        testId,
        testName: test.testName,
        stressRegime: 'quantum',
        metricName: 'quantum_variance',
        metricValue: variance,
        threshold: varianceThreshold,
        passed,
        impactLevel,
        details: {
          quantumStates: quantumStatesMap,
          collapsedState: collapsedState.toString(),
          expectedValue: expectedValue.toString(),
          collapseProbability,
        },
      },
    });

    logger.info('GRU Quantum Stress: Quantum stress test completed', {
      testId,
      variance: variance.toString(),
      passed,
      impactLevel,
    });

    return {
      testId,
      quantumStates: quantumStatesMap,
      collapsedState,
      expectedValue,
      variance,
      passed,
      impactLevel,
    };
  }

  /**
   * Simulate quantum arbitrage suppression
   * Tests if quantum arbitrage opportunities are suppressed
   */
  async simulateQuantumArbitrageSuppression(
    indexCode: GruIndexCode
  ): Promise<boolean> {
    const index = await gruIndexService.getIndex(indexCode);
    if (!index) {
      throw new Error(`Index not found: ${indexCode}`);
    }

    const currentValue = index.currentValue;

    // Simulate potential arbitrage opportunities
    // In quantum system, arbitrage should be suppressed
    const arbitrageWindow = currentValue.times(0.001); // 0.1% arbitrage window

    // Check if arbitrage is suppressed (variance within window)
    const history = await gruIndexService.getIndexHistory(indexCode, 10);
    if (history.length < 2) {
      return true; // No data, assume suppressed
    }

    const recentVariance = history[0].indexValue.minus(history[1].indexValue).abs();
    const isSuppressed = recentVariance.lessThan(arbitrageWindow);

    logger.info('GRU Quantum Stress: Quantum arbitrage suppression check', {
      indexCode,
      isSuppressed,
      recentVariance: recentVariance.toString(),
      arbitrageWindow: arbitrageWindow.toString(),
    });

    return isSuppressed;
  }

  /**
   * Get quantum stress test by ID
   */
  async getQuantumStressTest(testId: string) {
    return await prisma.gruStressTest.findUnique({
      where: { testId },
      include: {
        results: {
          where: { stressRegime: 'quantum' },
        },
      },
    });
  }
}

export const gruQuantumStressService = new GruQuantumStressService();

