/**
 * Metacognitive Verifier Service
 * Implements AI self-verification before proposing actions
 *
 * Core Tractatus Service: Provides structured "pause and verify" mechanism
 * where AI checks its own reasoning before execution.
 *
 * Verification Checks:
 * 1. Alignment: Does action align with stated user goals?
 * 2. Coherence: Is reasoning internally consistent?
 * 3. Completeness: Are all requirements addressed?
 * 4. Safety: Could this action cause harm or confusion?
 * 5. Alternatives: Have better approaches been considered?
 */

const classifier = require('./InstructionPersistenceClassifier.service');
const validator = require('./CrossReferenceValidator.service');
const enforcer = require('./BoundaryEnforcer.service');
const monitor = require('./ContextPressureMonitor.service');
const logger = require('../utils/logger.util');

/**
 * Verification dimensions
 */
const VERIFICATION_DIMENSIONS = {
  ALIGNMENT: {
    name: 'Alignment',
    description: 'Action aligns with user goals and explicit instructions',
    weight: 0.3,
    criticalThreshold: 0.7
  },
  COHERENCE: {
    name: 'Coherence',
    description: 'Reasoning is internally consistent and logical',
    weight: 0.2,
    criticalThreshold: 0.7
  },
  COMPLETENESS: {
    name: 'Completeness',
    description: 'All requirements and constraints addressed',
    weight: 0.2,
    criticalThreshold: 0.8
  },
  SAFETY: {
    name: 'Safety',
    description: 'Action will not cause harm, confusion, or data loss',
    weight: 0.2,
    criticalThreshold: 0.9
  },
  ALTERNATIVES: {
    name: 'Alternatives',
    description: 'Better alternative approaches have been considered',
    weight: 0.1,
    criticalThreshold: 0.6
  }
};

/**
 * Confidence levels
 */
const CONFIDENCE_LEVELS = {
  HIGH: { min: 0.8, action: 'PROCEED', description: 'High confidence, proceed' },
  MEDIUM: { min: 0.6, action: 'PROCEED_WITH_CAUTION', description: 'Medium confidence, proceed with notification' },
  LOW: { min: 0.4, action: 'REQUEST_CONFIRMATION', description: 'Low confidence, request user confirmation' },
  VERY_LOW: { min: 0.0, action: 'REQUIRE_REVIEW', description: 'Very low confidence, require human review' }
};

class MetacognitiveVerifier {
  constructor() {
    this.dimensions = VERIFICATION_DIMENSIONS;
    this.confidenceLevels = CONFIDENCE_LEVELS;
    this.classifier = classifier;
    this.validator = validator;
    this.enforcer = enforcer;
    this.monitor = monitor;

    // Statistics tracking
    this.stats = {
      total_verifications: 0,
      by_decision: {
        PROCEED: 0,
        REQUEST_CONFIRMATION: 0,
        REQUEST_CLARIFICATION: 0,
        BLOCK: 0
      },
      average_confidence: 0,
      total_confidence_sum: 0
    };

    logger.info('MetacognitiveVerifier initialized');
  }

  /**
   * Verify a proposed action before execution
   * @param {Object} action - The proposed action
   * @param {Object} reasoning - The reasoning behind the action
   * @param {Object} context - Conversation/session context
   * @returns {Object} Verification result
   */
  verify(action, reasoning, context) {
    try {
      // Run all verification checks
      const alignmentScore = this._checkAlignment(action, reasoning, context);
      const coherenceScore = this._checkCoherence(action, reasoning, context);
      const completenessScore = this._checkCompleteness(action, reasoning, context);
      const safetyScore = this._checkSafety(action, reasoning, context);
      const alternativesScore = this._checkAlternatives(action, reasoning, context);

      // Calculate weighted confidence score
      const scores = {
        alignment: alignmentScore,
        coherence: coherenceScore,
        completeness: completenessScore,
        safety: safetyScore,
        alternatives: alternativesScore
      };

      const confidence = this._calculateConfidence(scores);

      // Determine confidence level
      const confidenceLevel = this._determineConfidenceLevel(confidence);

      // Check for critical failures
      const criticalFailures = this._checkCriticalFailures(scores);

      // Get pressure analysis
      const pressureAnalysis = this.monitor.analyzePressure(context);

      // Adjust confidence based on pressure
      const adjustedConfidence = this._adjustForPressure(
        confidence,
        pressureAnalysis
      );

      // Generate verification result
      const decision = this._makeVerificationDecision(
        adjustedConfidence,
        criticalFailures,
        pressureAnalysis
      );

      const verification = {
        confidence: adjustedConfidence,
        originalConfidence: confidence,
        level: confidenceLevel.action,
        description: confidenceLevel.description,
        checks: {
          alignment: { passed: alignmentScore.score >= 0.7, score: alignmentScore.score, issues: alignmentScore.issues || [] },
          coherence: { passed: coherenceScore.score >= 0.7, score: coherenceScore.score, issues: coherenceScore.issues || [] },
          completeness: { passed: completenessScore.score >= 0.8, score: completenessScore.score, missing_considerations: completenessScore.missing || [] },
          safety: { passed: safetyScore.score >= 0.9, score: safetyScore.score, risk_level: safetyScore.riskLevel || 'UNKNOWN', concerns: safetyScore.concerns || [] },
          alternatives: { passed: alternativesScore.score >= 0.6, score: alternativesScore.score, issues: alternativesScore.issues || [] }
        },
        scores,
        criticalFailures,
        pressureLevel: pressureAnalysis.pressureName,
        pressure_adjustment: adjustedConfidence - confidence,
        confidence_adjustment: adjustedConfidence - confidence,
        pressureAdjustment: adjustedConfidence - confidence,
        threshold_adjusted: pressureAnalysis.pressureName !== 'NORMAL',
        required_confidence: pressureAnalysis.pressureName === 'CRITICAL' ? 0.8 : 0.6,
        requires_confirmation: decision === 'REQUEST_CONFIRMATION',
        recommendations: this._generateRecommendations(
          scores,
          criticalFailures,
          pressureAnalysis
        ),
        decision,
        reason: decision !== 'PROCEED' ? this._getDecisionReason(decision, scores, criticalFailures) : undefined,
        analysis: {
          failed_checks: criticalFailures.map(cf => cf.dimension),
          recommendations: this._generateRecommendations(scores, criticalFailures, pressureAnalysis)
        },
        suggestions: decision !== 'PROCEED' ? this._generateSuggestions(scores, criticalFailures) : undefined,
        timestamp: new Date()
      };

      // Track statistics
      this.stats.total_verifications++;
      this.stats.total_confidence_sum += adjustedConfidence;
      this.stats.average_confidence = this.stats.total_confidence_sum / this.stats.total_verifications;
      if (this.stats.by_decision[decision] !== undefined) {
        this.stats.by_decision[decision]++;
      }

      // Log verification
      if (verification.decision !== 'PROCEED') {
        logger.warn('Action verification flagged', {
          action: action.description?.substring(0, 50),
          decision: verification.decision,
          confidence: adjustedConfidence
        });
      }

      return verification;

    } catch (error) {
      logger.error('Verification error:', error);
      return this._failSafeVerification(action);
    }
  }

  /**
   * Quick verification for low-risk actions
   */
  quickVerify(action, context) {
    // Simplified verification for routine actions
    const boundaryCheck = this.enforcer.enforce(action, context);
    const pressureCheck = this.monitor.shouldProceed(action, context);

    if (!boundaryCheck.allowed || !pressureCheck.proceed) {
      return {
        confidence: 0.3,
        level: 'REQUIRE_REVIEW',
        decision: 'BLOCK',
        reason: 'Failed boundary or pressure check',
        timestamp: new Date()
      };
    }

    return {
      confidence: 0.7,
      level: 'PROCEED',
      decision: 'PROCEED',
      quickCheck: true,
      timestamp: new Date()
    };
  }

  /**
   * Private verification methods
   */

  _checkAlignment(action, reasoning, context) {
    let score = 0.5; // Base score
    const issues = [];

    // Check if action parameters conflict with reasoning
    if (action.parameters && reasoning.explanation) {
      const paramConflict = this._checkParameterConflicts(action.parameters, reasoning);
      if (paramConflict) {
        score -= 0.4;
        issues.push('action parameters conflict with reasoning');
      }
    }

    // Check cross-reference validation
    const validation = this.validator.validate(action, context);
    if (validation.status === 'APPROVED') {
      score += 0.3;
    } else if (validation.status === 'WARNING') {
      score += 0.1;
      issues.push('Minor conflict detected with user instructions');
    } else if (validation.status === 'REJECTED') {
      score -= 0.3;
      issues.push('Action conflicts with explicit user instructions');
    }

    // Check if action addresses stated user goal
    if (reasoning.userGoal && reasoning.addresses) {
      score += 0.2;
    }

    // Check consistency with recent user statements
    if (context.recentUserStatements) {
      const consistencyScore = this._checkConsistencyWithStatements(
        action,
        context.recentUserStatements
      );
      score += consistencyScore * 0.2;
      if (consistencyScore < 0.5) {
        issues.push('Action may not be consistent with recent user statements');
      }
    }

    return {
      score: Math.min(1.0, Math.max(0.0, score)),
      issues
    };
  }

  _checkCoherence(action, reasoning, context) {
    let score = 0.7; // Default to reasonable coherence
    const issues = [];

    // Check if reasoning steps are provided
    if (!reasoning.steps || reasoning.steps.length === 0) {
      score -= 0.2;
      issues.push('No reasoning steps provided');
    }

    // Check for logical consistency
    if (reasoning.assumptions && reasoning.conclusions) {
      const logicallySound = this._checkLogicalFlow(
        reasoning.assumptions,
        reasoning.conclusions
      );
      if (logicallySound) {
        score += 0.2;
      } else {
        score -= 0.3;
        issues.push('Logical inconsistency detected between assumptions and conclusions');
      }
    }

    // Check for internal contradictions
    if (this._hasContradictions(reasoning)) {
      score -= 0.4;
      issues.push('Internal contradictions detected in reasoning');
    }

    return {
      score: Math.min(1.0, Math.max(0.0, score)),
      issues
    };
  }

  _checkCompleteness(action, reasoning, context) {
    let score = 0.5; // Base score
    const missing = [];

    // Check if reasoning has steps
    if (reasoning.steps && reasoning.steps.length > 0) {
      score += 0.2;

      // Check for quality of steps (comprehensive coverage)
      const stepCount = reasoning.steps.length;
      if (stepCount >= 4) {
        score += 0.2; // Comprehensive steps
      } else if (stepCount < 2) {
        score -= 0.1; // Too few steps
        missing.push('insufficient steps provided');
      }

      // For deployment actions, check for critical steps
      if (action.type === 'deploy' || action.parameters?.environment === 'production') {
        const stepsText = reasoning.steps.join(' ').toLowerCase();
        if (!stepsText.includes('test')) {
          missing.push('testing');
          score -= 0.2;
        }
        if (!stepsText.includes('backup')) {
          missing.push('backup');
          score -= 0.1;
        }
      }
    } else {
      missing.push('No reasoning steps provided');
      score -= 0.2;
    }

    // Check if all stated requirements are addressed
    if (context.requirements) {
      const unaddressed = context.requirements.filter(req =>
        !this._isRequirementAddressed(req, action, reasoning)
      );
      const addressedCount = context.requirements.length - unaddressed.length;
      score += (addressedCount / context.requirements.length) * 0.2;
      unaddressed.forEach(req => missing.push(`Requirement not addressed: ${req}`));
    }

    // Check for edge cases consideration
    if (reasoning.edgeCases && reasoning.edgeCases.length > 0) {
      score += 0.1;
    }

    // Check for error handling
    if (reasoning.errorHandling || action.errorHandling) {
      score += 0.1;
    }

    return {
      score: Math.min(1.0, Math.max(0.0, score)),
      missing
    };
  }

  _checkSafety(action, reasoning, context) {
    let score = 0.9; // Start with safe assumption
    const concerns = [];
    let riskLevel = 'LOW';

    // Check boundary enforcement
    const boundaryCheck = this.enforcer.enforce(action, context);
    if (!boundaryCheck.allowed) {
      score -= 0.5; // Major safety concern
      concerns.push('Action violates Tractatus boundaries');
      riskLevel = 'CRITICAL';
    }

    // Check for destructive operations in action type or description
    const destructivePatterns = [
      /delete|remove|drop|truncate/i,
      /force|--force|-f\s/i,
      /rm\s+-rf/i
    ];

    const actionText = (action.type || '') + ' ' + (action.description || '') + ' ' + (action.command || '');
    const isDestructive = destructivePatterns.some(pattern => pattern.test(actionText));

    if (isDestructive) {
      score -= 0.3;
      concerns.push('destructive operation');
      riskLevel = 'HIGH';
    }

    // Check if data backup is mentioned for risky operations
    if (score < 0.7 && !reasoning.backupMentioned) {
      score -= 0.1;
      concerns.push('No backup mentioned for risky operation');
    }

    // Check for validation before execution
    if (action.requiresValidation && !reasoning.validationPlanned) {
      score -= 0.1;
      concerns.push('No validation planned before execution');
    }

    return {
      score: Math.min(1.0, Math.max(0.0, score)),
      riskLevel,
      concerns
    };
  }

  _checkAlternatives(action, reasoning, context) {
    let score = 0.5; // Base score
    const issues = [];

    // Support both camelCase and snake_case for alternatives
    const alternatives = reasoning.alternativesConsidered || reasoning.alternatives_considered;
    const explored = reasoning.explored;

    // Check if alternatives were considered
    if (alternatives && alternatives.length > 0) {
      score += 0.3;
    } else {
      issues.push('No alternatives considered');
    }

    // Check if rationale for chosen approach is provided
    if (reasoning.chosenBecause || reasoning.chosen_because) {
      score += 0.2;
    } else {
      issues.push('No rationale provided for chosen approach');
    }

    // Lower score if action seems like first idea without exploration
    if (!alternatives && !explored) {
      score -= 0.2;
      issues.push('Appears to be first idea without exploration');
    }

    return {
      score: Math.min(1.0, Math.max(0.0, score)),
      issues
    };
  }

  _calculateConfidence(scores) {
    let confidence = 0;

    for (const [dimension, dimensionConfig] of Object.entries(this.dimensions)) {
      const key = dimension.toLowerCase();
      const scoreData = scores[key];
      // Handle both object format {score: X} and legacy number format
      const score = typeof scoreData === 'object' ? (scoreData.score || 0.5) : (scoreData || 0.5);
      confidence += score * dimensionConfig.weight;
    }

    return Math.min(1.0, Math.max(0.0, confidence));
  }

  _determineConfidenceLevel(confidence) {
    if (confidence >= CONFIDENCE_LEVELS.HIGH.min) {
      return CONFIDENCE_LEVELS.HIGH;
    }
    if (confidence >= CONFIDENCE_LEVELS.MEDIUM.min) {
      return CONFIDENCE_LEVELS.MEDIUM;
    }
    if (confidence >= CONFIDENCE_LEVELS.LOW.min) {
      return CONFIDENCE_LEVELS.LOW;
    }
    return CONFIDENCE_LEVELS.VERY_LOW;
  }

  _checkCriticalFailures(scores) {
    const failures = [];

    for (const [dimension, config] of Object.entries(this.dimensions)) {
      const key = dimension.toLowerCase();
      const scoreData = scores[key];
      // Handle both object format {score: X} and legacy number format
      const score = typeof scoreData === 'object' ? (scoreData.score || 0.5) : (scoreData || 0.5);

      if (score < config.criticalThreshold) {
        failures.push({
          dimension: config.name,
          score,
          threshold: config.criticalThreshold,
          severity: score < 0.3 ? 'CRITICAL' : 'WARNING'
        });
      }
    }

    return failures;
  }

  _adjustForPressure(confidence, pressureAnalysis) {
    // Reduce confidence based on pressure level
    const pressureReduction = {
      NORMAL: 0,
      ELEVATED: 0.05,
      HIGH: 0.10,
      CRITICAL: 0.15,
      DANGEROUS: 0.25
    };

    const reduction = pressureReduction[pressureAnalysis.pressureName] || 0;
    return Math.max(0.0, confidence - reduction);
  }

  _generateRecommendations(scores, criticalFailures, pressureAnalysis) {
    const recommendations = [];

    // Recommendations based on low scores
    for (const [key, score] of Object.entries(scores)) {
      if (score < 0.5) {
        const dimension = this.dimensions[key.toUpperCase()];
        recommendations.push({
          type: 'LOW_SCORE',
          dimension: dimension.name,
          score,
          message: `Low ${dimension.name.toLowerCase()} score - ${dimension.description}`,
          action: `Improve ${dimension.name.toLowerCase()} before proceeding`
        });
      }
    }

    // Recommendations based on critical failures
    for (const failure of criticalFailures) {
      recommendations.push({
        type: 'CRITICAL_FAILURE',
        dimension: failure.dimension,
        severity: failure.severity,
        message: `${failure.dimension} below critical threshold`,
        action: 'Address this issue before proceeding'
      });
    }

    // Include pressure recommendations
    if (pressureAnalysis.recommendations) {
      recommendations.push(...pressureAnalysis.recommendations);
    }

    return recommendations;
  }

  _makeVerificationDecision(confidence, criticalFailures, pressureAnalysis) {
    // Block if critical failures
    if (criticalFailures.some(f => f.severity === 'CRITICAL')) {
      return 'BLOCK';
    }

    // Block if dangerous pressure
    if (pressureAnalysis.pressureLevel >= 4) {
      return 'BLOCK';
    }

    // Require review if very low confidence
    if (confidence < 0.4) {
      return 'REQUIRE_REVIEW';
    }

    // Request confirmation if low confidence
    if (confidence < 0.6) {
      return 'REQUEST_CONFIRMATION';
    }

    // Proceed with caution if medium confidence
    if (confidence < 0.8) {
      return 'PROCEED_WITH_CAUTION';
    }

    // Proceed if high confidence
    return 'PROCEED';
  }

  /**
   * Helper methods
   */

  _checkConsistencyWithStatements(action, statements) {
    // Simplified consistency check
    return 0.5; // Default to neutral
  }

  _checkLogicalFlow(assumptions, conclusions) {
    // Simplified logical flow check
    return true; // Assume logical unless obviously not
  }

  _hasContradictions(reasoning) {
    // Check for contradictory statements in reasoning
    if (!reasoning.explanation && !reasoning.steps) {
      return false;
    }

    const text = (reasoning.explanation || '') + ' ' + (reasoning.steps || []).join(' ');
    const lower = text.toLowerCase();

    // Simple contradiction patterns
    const contradictionPatterns = [
      [/should use/i, /should not use/i],
      [/will use/i, /will not use/i],
      [/must.*true/i, /must.*false/i],
      [/enable/i, /disable/i]
    ];

    for (const [pattern1, pattern2] of contradictionPatterns) {
      if (pattern1.test(text) && pattern2.test(text)) {
        return true;
      }
    }

    return false;
  }

  _checkParameterConflicts(parameters, reasoning) {
    // Check if parameter values in action conflict with reasoning
    // Only flag conflicts for explicit parameter assignments, not casual mentions
    const reasoningText = (reasoning.explanation || '') + ' ' + (reasoning.evidence || []).join(' ');

    for (const [key, value] of Object.entries(parameters)) {
      const valueStr = String(value);

      // Check for explicit parameter assignments only (key: value or key = value)
      // Pattern matches "port: 27017" or "port = 27017" but not "port read"
      const keyPattern = new RegExp(`\\b${key}\\s*[:=]\\s*([\\w.-]+)`, 'i');
      const match = reasoningText.match(keyPattern);

      if (match && match[1] !== valueStr) {
        return true; // Conflict: reasoning explicitly assigns different value
      }
    }

    return false;
  }

  _isRequirementAddressed(requirement, action, reasoning) {
    // Simplified requirement matching
    const actionText = (action.description || '').toLowerCase();
    const requirementText = requirement.toLowerCase();
    return actionText.includes(requirementText);
  }

  _failSafeVerification(action) {
    return {
      confidence: 0.3,
      originalConfidence: 0.3,
      level: 'REQUIRE_REVIEW',
      description: 'Verification failed, requiring human review',
      decision: 'BLOCK',
      checks: {
        alignment: { passed: false, score: 0, issues: ['verification error'] },
        coherence: { passed: false, score: 0, issues: ['verification error'] },
        completeness: { passed: false, score: 0, missing_considerations: ['verification error'] },
        safety: { passed: false, score: 0, risk_level: 'HIGH', concerns: ['verification error'] },
        alternatives: { passed: false, score: 0, issues: ['verification error'] }
      },
      scores: {},
      criticalFailures: [{
        dimension: 'ERROR',
        score: 0,
        threshold: 1,
        severity: 'CRITICAL'
      }],
      pressureLevel: 'ELEVATED',
      pressureAdjustment: 0,
      recommendations: [{
        type: 'ERROR',
        severity: 'CRITICAL',
        message: 'Verification process encountered error',
        action: 'Require human review before proceeding'
      }],
      timestamp: new Date()
    };
  }

  /**
   * Get decision reason (exposed for tests)
   */
  _getDecisionReason(decision, scores, criticalFailures) {
    if (decision === 'BLOCK') {
      return 'Critical failures detected: ' + criticalFailures.map(cf => cf.dimension).join(', ');
    }
    if (decision === 'REQUEST_CLARIFICATION') {
      return 'Low confidence in alignment or completeness';
    }
    if (decision === 'REQUEST_CONFIRMATION') {
      return 'Moderate confidence, user confirmation recommended';
    }
    return 'Proceeding with high confidence';
  }

  /**
   * Generate suggestions for improvement (exposed for tests)
   */
  _generateSuggestions(scores, criticalFailures) {
    const suggestions = [];

    if (scores.alignment && scores.alignment.score < 0.7) {
      suggestions.push('Clarify how this action aligns with user goals');
    }
    if (scores.coherence && scores.coherence.score < 0.7) {
      suggestions.push('Review reasoning for logical consistency');
    }
    if (scores.completeness && scores.completeness.score < 0.8) {
      suggestions.push('Ensure all requirements are addressed');
    }
    if (scores.safety && scores.safety.score < 0.9) {
      suggestions.push('Verify safety implications of this action');
    }
    if (scores.alternatives && scores.alternatives.score < 0.6) {
      suggestions.push('Consider alternative approaches');
    }

    return suggestions;
  }

  /**
   * Assess evidence quality (exposed for tests)
   */
  _assessEvidenceQuality(reasoning) {
    if (!reasoning || !reasoning.evidence) return 0.0;

    const evidence = reasoning.evidence;
    if (!Array.isArray(evidence) || evidence.length === 0) return 0.0;

    let qualityScore = 0;

    // Check for explicit user instructions
    const hasExplicit = evidence.some(e =>
      typeof e === 'string' && /user\s+(explicitly|specifically|said|requested|instructed)/i.test(e)
    );
    if (hasExplicit) qualityScore += 0.4;

    // Check for documentation references
    const hasDocs = evidence.some(e =>
      typeof e === 'string' && /documentation|docs|spec|standard/i.test(e)
    );
    if (hasDocs) qualityScore += 0.3;

    // Check for testing/validation
    const hasValidation = evidence.some(e =>
      typeof e === 'string' && /test|validate|verify|confirm/i.test(e)
    );
    if (hasValidation) qualityScore += 0.3;

    // Penalize weak evidence
    const hasWeak = evidence.some(e =>
      typeof e === 'string' && /think|maybe|probably|assume/i.test(e)
    );
    if (hasWeak) qualityScore -= 0.3;

    return Math.max(0, Math.min(1, qualityScore));
  }

  /**
   * Assess reasoning quality (exposed for tests)
   */
  _assessReasoningQuality(reasoning) {
    if (!reasoning) return 0.0;

    let score = 0;

    // Check explanation quality
    if (reasoning.explanation) {
      const length = reasoning.explanation.length;
      if (length > 100) score += 0.3;
      else if (length > 50) score += 0.1;
    }

    // Check evidence
    const evidenceScore = this._assessEvidenceQuality(reasoning);
    score += evidenceScore * 0.4;

    // Check steps
    if (reasoning.steps && Array.isArray(reasoning.steps) && reasoning.steps.length > 0) {
      score += Math.min(0.3, reasoning.steps.length * 0.1);
    }

    // Check alternatives
    if (reasoning.alternatives_considered && reasoning.alternatives_considered.length > 0) {
      score += 0.2;
    }

    return Math.min(1.0, score);
  }

  /**
   * Make verification decision (exposed for tests)
   */
  _makeDecision(confidence, context) {
    const pressureLevel = context.pressure_level || 'NORMAL';

    // Block at dangerous pressure regardless of confidence
    if (pressureLevel === 'DANGEROUS') {
      return { decision: 'BLOCK', requires_confirmation: true };
    }

    // Adjust thresholds based on pressure
    const proceedThreshold = pressureLevel === 'CRITICAL' ? 0.8 : 0.7;
    const confirmThreshold = pressureLevel === 'HIGH' ? 0.6 : 0.5;

    if (confidence >= proceedThreshold) {
      return { decision: 'PROCEED', requires_confirmation: false };
    } else if (confidence >= confirmThreshold) {
      return { decision: 'REQUEST_CONFIRMATION', requires_confirmation: true };
    } else if (confidence >= 0.3) {
      return { decision: 'REQUEST_CLARIFICATION', requires_confirmation: true };
    } else {
      return { decision: 'BLOCK', requires_confirmation: true };
    }
  }

  /**
   * Get verification statistics
   * @returns {Object} Statistics object
   */
  getStats() {
    return {
      ...this.stats,
      timestamp: new Date()
    };
  }
}

// Singleton instance
const verifier = new MetacognitiveVerifier();

module.exports = verifier;