mcp-infinite-loop-server/src/errorHandler.js

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/**
 * Advanced Error Handling System
 * Revolutionary intelligent error detection, recovery, and prevention for ZAI MCP Server
 */

import { EventEmitter } from 'events';

export class ErrorHandler extends EventEmitter {
  constructor(mlIntegration, blockchainIntegration) {
    super();
    this.mlIntegration = mlIntegration;
    this.blockchainIntegration = blockchainIntegration;
    
    // BREAKTHROUGH FEATURE: Intelligent Error Classification
    this.errorClassification = {
      categories: new Map(),
      patterns: new Map(),
      severity: new Map(),
      recovery: new Map()
    };
    
    // BREAKTHROUGH FEATURE: Predictive Error Prevention
    this.errorPrevention = {
      predictiveModels: new Map(),
      earlyWarnings: new Map(),
      preventionStrategies: new Map(),
      riskAssessments: new Map()
    };
    
    // BREAKTHROUGH FEATURE: Autonomous Error Recovery
    this.autonomousRecovery = {
      recoveryStrategies: new Map(),
      fallbackMechanisms: new Map(),
      selfHealingActions: new Map(),
      recoveryHistory: new Map()
    };
    
    // BREAKTHROUGH FEATURE: Error Analytics and Learning
    this.errorAnalytics = {
      errorHistory: [],
      patternAnalysis: new Map(),
      rootCauseAnalysis: new Map(),
      improvementSuggestions: new Map()
    };
    
    // BREAKTHROUGH FEATURE: Real-time Error Monitoring
    this.realTimeMonitoring = {
      activeMonitors: new Map(),
      alertThresholds: new Map(),
      escalationPaths: new Map(),
      notificationChannels: new Map()
    };
    
    console.log('[ERROR HANDLER] 🛠️ Advanced error handling system initialized');
    this.initializeErrorHandling();
  }

  /**
   * BREAKTHROUGH METHOD: Initialize comprehensive error handling
   */
  initializeErrorHandling() {
    // Setup error classification system
    this.setupErrorClassification();
    
    // Initialize predictive error prevention
    this.initializePredictiveErrorPrevention();
    
    // Setup autonomous recovery mechanisms
    this.setupAutonomousRecovery();
    
    // Initialize real-time monitoring
    this.initializeRealTimeMonitoring();
    
    // Setup global error handlers
    this.setupGlobalErrorHandlers();
    
    console.log('[ERROR HANDLER] 🔧 Comprehensive error handling initialized');
  }

  /**
   * BREAKTHROUGH METHOD: Handle error with intelligent classification and recovery
   */
  async handleError(error, context = {}) {
    const errorId = this.generateErrorId();
    const timestamp = Date.now();
    
    try {
      console.log(`[ERROR HANDLER] 🚨 Processing error: ${errorId}`);
      
      // Step 1: Classify the error
      const classification = await this.classifyError(error, context);
      
      // Step 2: Assess severity and impact
      const assessment = await this.assessErrorImpact(error, classification, context);
      
      // Step 3: Record error for analytics
      await this.recordError(errorId, error, classification, assessment, context);
      
      // Step 4: Attempt autonomous recovery
      const recoveryResult = await this.attemptAutonomousRecovery(error, classification, context);
      
      // Step 5: Update predictive models
      await this.updatePredictiveModels(error, classification, recoveryResult);
      
      // Step 6: Generate improvement suggestions
      const improvements = await this.generateImprovementSuggestions(error, classification, context);
      
      // Step 7: Record on blockchain if critical
      if (assessment.severity >= 0.8) {
        await this.recordCriticalErrorOnBlockchain(errorId, error, classification, assessment);
      }
      
      const result = {
        errorId,
        timestamp,
        classification,
        assessment,
        recoveryResult,
        improvements,
        handled: true
      };
      
      // Emit error handled event
      this.emit('errorHandled', result);
      
      console.log(`[ERROR HANDLER] ✅ Error handled successfully: ${errorId}`);
      
      return result;
      
    } catch (handlingError) {
      console.error(`[ERROR HANDLER] ❌ Error handling failed for ${errorId}: ${handlingError.message}`);
      
      // Fallback error handling
      return await this.fallbackErrorHandling(error, context, handlingError);
    }
  }

  /**
   * BREAKTHROUGH METHOD: Classify error using ML and pattern recognition
   */
  async classifyError(error, context) {
    const classification = {
      category: 'unknown',
      subcategory: 'unclassified',
      confidence: 0.5,
      patterns: [],
      tags: []
    };
    
    try {
      // Extract error features
      const features = this.extractErrorFeatures(error, context);
      
      // Use ML for classification if available
      if (this.mlIntegration) {
        const mlClassification = await this.mlIntegration.classifyError(features);
        classification.category = mlClassification.category;
        classification.subcategory = mlClassification.subcategory;
        classification.confidence = mlClassification.confidence;
      }
      
      // Pattern-based classification
      const patternMatch = this.matchErrorPatterns(error, context);
      if (patternMatch.confidence > classification.confidence) {
        classification.category = patternMatch.category;
        classification.subcategory = patternMatch.subcategory;
        classification.confidence = patternMatch.confidence;
      }
      
      // Add relevant tags
      classification.tags = this.generateErrorTags(error, context, classification);
      
      console.log(`[ERROR HANDLER] 🏷️ Error classified: ${classification.category}/${classification.subcategory} (${(classification.confidence * 100).toFixed(1)}%)`);
      
    } catch (classificationError) {
      console.error(`[ERROR HANDLER] ❌ Error classification failed: ${classificationError.message}`);
    }
    
    return classification;
  }

  /**
   * BREAKTHROUGH METHOD: Assess error impact and severity
   */
  async assessErrorImpact(error, classification, context) {
    const assessment = {
      severity: 0.5,
      impact: 'medium',
      affectedSystems: [],
      businessImpact: 'low',
      urgency: 'medium',
      riskLevel: 'medium'
    };
    
    try {
      // Calculate severity based on multiple factors
      const severityFactors = {
        errorType: this.getErrorTypeSeverity(error),
        systemCriticality: this.getSystemCriticality(context),
        userImpact: this.getUserImpact(context),
        dataIntegrity: this.getDataIntegrityRisk(error, context),
        securityImplications: this.getSecurityImplications(error, context)
      };
      
      // Weighted severity calculation
      assessment.severity = this.calculateWeightedSeverity(severityFactors);
      
      // Determine impact level
      assessment.impact = this.determineImpactLevel(assessment.severity);
      
      // Identify affected systems
      assessment.affectedSystems = this.identifyAffectedSystems(error, context);
      
      // Assess business impact
      assessment.businessImpact = this.assessBusinessImpact(assessment.severity, assessment.affectedSystems);
      
      // Determine urgency
      assessment.urgency = this.determineUrgency(assessment.severity, assessment.businessImpact);
      
      // Calculate risk level
      assessment.riskLevel = this.calculateRiskLevel(assessment.severity, assessment.impact, assessment.urgency);
      
      console.log(`[ERROR HANDLER] 📊 Error impact assessed: ${assessment.impact} (severity: ${(assessment.severity * 100).toFixed(1)}%)`);
      
    } catch (assessmentError) {
      console.error(`[ERROR HANDLER] ❌ Error impact assessment failed: ${assessmentError.message}`);
    }
    
    return assessment;
  }

  /**
   * BREAKTHROUGH METHOD: Attempt autonomous error recovery
   */
  async attemptAutonomousRecovery(error, classification, context) {
    const recoveryResult = {
      attempted: false,
      successful: false,
      strategy: 'none',
      actions: [],
      duration: 0,
      fallbackUsed: false
    };
    
    try {
      const startTime = Date.now();
      
      // Get recovery strategy for error type
      const strategy = this.getRecoveryStrategy(classification, context);
      
      if (strategy) {
        recoveryResult.attempted = true;
        recoveryResult.strategy = strategy.name;
        
        console.log(`[ERROR HANDLER] 🔄 Attempting recovery strategy: ${strategy.name}`);
        
        // Execute recovery actions
        for (const action of strategy.actions) {
          try {
            const actionResult = await this.executeRecoveryAction(action, error, context);
            recoveryResult.actions.push({
              action: action.name,
              result: actionResult,
              successful: actionResult.success
            });
            
            if (!actionResult.success && action.critical) {
              throw new Error(`Critical recovery action failed: ${action.name}`);
            }
          } catch (actionError) {
            console.error(`[ERROR HANDLER] ❌ Recovery action failed: ${action.name} - ${actionError.message}`);
            recoveryResult.actions.push({
              action: action.name,
              result: { success: false, error: actionError.message },
              successful: false
            });
          }
        }
        
        // Check if recovery was successful
        recoveryResult.successful = await this.verifyRecovery(error, context, strategy);
        recoveryResult.duration = Date.now() - startTime;
        
        if (recoveryResult.successful) {
          console.log(`[ERROR HANDLER] ✅ Autonomous recovery successful: ${strategy.name} (${recoveryResult.duration}ms)`);
        } else {
          console.log(`[ERROR HANDLER] ❌ Autonomous recovery failed: ${strategy.name}`);
          
          // Attempt fallback recovery
          const fallbackResult = await this.attemptFallbackRecovery(error, classification, context);
          recoveryResult.fallbackUsed = fallbackResult.attempted;
          recoveryResult.successful = fallbackResult.successful;
        }
      }
      
    } catch (recoveryError) {
      console.error(`[ERROR HANDLER] ❌ Autonomous recovery error: ${recoveryError.message}`);
      recoveryResult.actions.push({
        action: 'recovery_system',
        result: { success: false, error: recoveryError.message },
        successful: false
      });
    }
    
    return recoveryResult;
  }

  /**
   * BREAKTHROUGH METHOD: Predict potential errors before they occur
   */
  async predictPotentialErrors(systemMetrics, context = {}) {
    const predictions = [];
    
    try {
      if (this.mlIntegration) {
        // Use ML models for error prediction
        const mlPredictions = await this.mlIntegration.predictErrors(systemMetrics, context);
        predictions.push(...mlPredictions);
      }
      
      // Pattern-based predictions
      const patternPredictions = this.predictErrorsFromPatterns(systemMetrics, context);
      predictions.push(...patternPredictions);
      
      // Threshold-based predictions
      const thresholdPredictions = this.predictErrorsFromThresholds(systemMetrics);
      predictions.push(...thresholdPredictions);
      
      // Filter and rank predictions
      const rankedPredictions = this.rankPredictions(predictions);
      
      if (rankedPredictions.length > 0) {
        console.log(`[ERROR HANDLER] 🔮 Predicted ${rankedPredictions.length} potential errors`);
        
        // Trigger preventive actions for high-confidence predictions
        await this.triggerPreventiveActions(rankedPredictions);
      }
      
      return rankedPredictions;
      
    } catch (predictionError) {
      console.error(`[ERROR HANDLER] ❌ Error prediction failed: ${predictionError.message}`);
      return [];
    }
  }

  /**
   * BREAKTHROUGH METHOD: Generate improvement suggestions based on error analysis
   */
  async generateImprovementSuggestions(error, classification, context) {
    const suggestions = [];
    
    try {
      // Code improvement suggestions
      const codeImprovements = this.generateCodeImprovements(error, classification);
      suggestions.push(...codeImprovements);
      
      // Architecture improvement suggestions
      const architectureImprovements = this.generateArchitectureImprovements(error, classification, context);
      suggestions.push(...architectureImprovements);
      
      // Process improvement suggestions
      const processImprovements = this.generateProcessImprovements(error, classification);
      suggestions.push(...processImprovements);
      
      // Monitoring improvement suggestions
      const monitoringImprovements = this.generateMonitoringImprovements(error, classification);
      suggestions.push(...monitoringImprovements);
      
      // Rank suggestions by impact and feasibility
      const rankedSuggestions = this.rankImprovementSuggestions(suggestions);
      
      console.log(`[ERROR HANDLER] 💡 Generated ${rankedSuggestions.length} improvement suggestions`);
      
      return rankedSuggestions;
      
    } catch (suggestionError) {
      console.error(`[ERROR HANDLER] ❌ Improvement suggestion generation failed: ${suggestionError.message}`);
      return [];
    }
  }

  /**
   * Helper methods
   */
  setupErrorClassification() {
    // Define error categories
    this.errorClassification.categories.set('system', ['memory', 'cpu', 'disk', 'network']);
    this.errorClassification.categories.set('application', ['logic', 'data', 'integration', 'performance']);
    this.errorClassification.categories.set('security', ['authentication', 'authorization', 'encryption', 'injection']);
    this.errorClassification.categories.set('ai', ['model', 'training', 'inference', 'quality']);
    this.errorClassification.categories.set('blockchain', ['consensus', 'validation', 'mining', 'transaction']);
    
    console.log('[ERROR HANDLER] 🏷️ Error classification system setup');
  }

  initializePredictiveErrorPrevention() {
    // Setup predictive models for different error types
    this.errorPrevention.predictiveModels.set('memory_leak', { threshold: 0.85, confidence: 0.8 });
    this.errorPrevention.predictiveModels.set('performance_degradation', { threshold: 0.7, confidence: 0.75 });
    this.errorPrevention.predictiveModels.set('security_breach', { threshold: 0.9, confidence: 0.9 });
    this.errorPrevention.predictiveModels.set('ai_quality_drop', { threshold: 0.6, confidence: 0.7 });
    
    console.log('[ERROR HANDLER] 🔮 Predictive error prevention initialized');
  }

  setupAutonomousRecovery() {
    // Define recovery strategies
    this.autonomousRecovery.recoveryStrategies.set('memory_leak', {
      name: 'memory_cleanup',
      actions: [
        { name: 'garbage_collection', critical: false },
        { name: 'cache_cleanup', critical: false },
        { name: 'restart_service', critical: true }
      ]
    });
    
    this.autonomousRecovery.recoveryStrategies.set('performance_degradation', {
      name: 'performance_optimization',
      actions: [
        { name: 'scale_resources', critical: false },
        { name: 'optimize_queries', critical: false },
        { name: 'load_balance', critical: true }
      ]
    });
    
    console.log('[ERROR HANDLER] 🔄 Autonomous recovery strategies setup');
  }

  initializeRealTimeMonitoring() {
    // Setup real-time error monitoring
    this.realTimeMonitoring.alertThresholds.set('error_rate', 0.05); // 5% error rate
    this.realTimeMonitoring.alertThresholds.set('response_time', 5000); // 5 seconds
    this.realTimeMonitoring.alertThresholds.set('memory_usage', 0.9); // 90% memory usage
    
    console.log('[ERROR HANDLER] 📊 Real-time error monitoring initialized');
  }

  setupGlobalErrorHandlers() {
    // Setup global error handlers for different types of errors
    process.on('uncaughtException', (error) => {
      this.handleError(error, { type: 'uncaught_exception', global: true });
    });
    
    process.on('unhandledRejection', (reason, promise) => {
      this.handleError(new Error(reason), { type: 'unhandled_rejection', promise, global: true });
    });
    
    console.log('[ERROR HANDLER] 🌐 Global error handlers setup');
  }

  generateErrorId() {
    return `error_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
  }

  extractErrorFeatures(error, context) {
    return {
      message: error.message || '',
      stack: error.stack || '',
      name: error.name || 'Error',
      code: error.code || null,
      context: context,
      timestamp: Date.now()
    };
  }

  matchErrorPatterns(error, context) {
    // Simple pattern matching - in real implementation, this would be more sophisticated
    const patterns = [
      { pattern: /memory/i, category: 'system', subcategory: 'memory', confidence: 0.8 },
      { pattern: /timeout/i, category: 'application', subcategory: 'performance', confidence: 0.7 },
      { pattern: /unauthorized/i, category: 'security', subcategory: 'authentication', confidence: 0.9 }
    ];
    
    for (const patternDef of patterns) {
      if (patternDef.pattern.test(error.message || '')) {
        return patternDef;
      }
    }
    
    return { category: 'unknown', subcategory: 'unclassified', confidence: 0.3 };
  }

  generateErrorTags(error, context, classification) {
    const tags = [];
    
    if (error.stack && error.stack.includes('async')) tags.push('async');
    if (context.global) tags.push('global');
    if (classification.confidence > 0.8) tags.push('high_confidence');
    if (error.code) tags.push(`code_${error.code}`);
    
    return tags;
  }

  // Mock implementation methods
  getErrorTypeSeverity(error) { return Math.random() * 0.5 + 0.3; }
  getSystemCriticality(context) { return Math.random() * 0.3 + 0.5; }
  getUserImpact(context) { return Math.random() * 0.4 + 0.2; }
  getDataIntegrityRisk(error, context) { return Math.random() * 0.3 + 0.1; }
  getSecurityImplications(error, context) { return Math.random() * 0.5 + 0.2; }
  
  calculateWeightedSeverity(factors) {
    const weights = { errorType: 0.3, systemCriticality: 0.25, userImpact: 0.2, dataIntegrity: 0.15, securityImplications: 0.1 };
    return Object.entries(factors).reduce((sum, [key, value]) => sum + (value * weights[key]), 0);
  }
  
  determineImpactLevel(severity) {
    if (severity > 0.8) return 'critical';
    if (severity > 0.6) return 'high';
    if (severity > 0.4) return 'medium';
    return 'low';
  }
  
  identifyAffectedSystems(error, context) {
    return ['ai_system', 'performance_monitor']; // Mock affected systems
  }
  
  assessBusinessImpact(severity, affectedSystems) {
    return severity > 0.7 ? 'high' : severity > 0.4 ? 'medium' : 'low';
  }
  
  determineUrgency(severity, businessImpact) {
    if (severity > 0.8 || businessImpact === 'high') return 'critical';
    if (severity > 0.6 || businessImpact === 'medium') return 'high';
    return 'medium';
  }
  
  calculateRiskLevel(severity, impact, urgency) {
    const riskScore = (severity * 0.4) + (impact === 'critical' ? 1 : impact === 'high' ? 0.7 : 0.4) * 0.3 + (urgency === 'critical' ? 1 : urgency === 'high' ? 0.7 : 0.4) * 0.3;
    return riskScore > 0.8 ? 'critical' : riskScore > 0.6 ? 'high' : riskScore > 0.4 ? 'medium' : 'low';
  }

  async recordError(errorId, error, classification, assessment, context) {
    this.errorAnalytics.errorHistory.push({
      errorId,
      error: { message: error.message, name: error.name, stack: error.stack },
      classification,
      assessment,
      context,
      timestamp: Date.now()
    });
    
    // Keep only last 1000 errors
    if (this.errorAnalytics.errorHistory.length > 1000) {
      this.errorAnalytics.errorHistory.shift();
    }
  }

  async updatePredictiveModels(error, classification, recoveryResult) {
    // Update ML models with new error data
    if (this.mlIntegration) {
      await this.mlIntegration.updateErrorModel({
        error,
        classification,
        recoveryResult,
        timestamp: Date.now()
      });
    }
  }

  async recordCriticalErrorOnBlockchain(errorId, error, classification, assessment) {
    if (this.blockchainIntegration) {
      try {
        await this.blockchainIntegration.recordSystemEvent({
          type: 'critical_error',
          errorId,
          classification: classification.category,
          severity: assessment.severity,
          timestamp: Date.now()
        });
      } catch (blockchainError) {
        console.error(`[ERROR HANDLER] ❌ Failed to record critical error on blockchain: ${blockchainError.message}`);
      }
    }
  }

  async fallbackErrorHandling(originalError, context, handlingError) {
    return {
      errorId: this.generateErrorId(),
      timestamp: Date.now(),
      classification: { category: 'system', subcategory: 'error_handler_failure' },
      assessment: { severity: 0.8, impact: 'high' },
      recoveryResult: { attempted: false, successful: false },
      improvements: [],
      handled: false,
      fallback: true,
      originalError: originalError.message,
      handlingError: handlingError.message
    };
  }

  getRecoveryStrategy(classification, context) {
    return this.autonomousRecovery.recoveryStrategies.get(classification.category) || null;
  }

  async executeRecoveryAction(action, error, context) {
    // Mock recovery action execution
    console.log(`[ERROR HANDLER] 🔧 Executing recovery action: ${action.name}`);
    
    // Simulate action execution
    await new Promise(resolve => setTimeout(resolve, Math.random() * 1000 + 500));
    
    return {
      success: Math.random() > 0.2, // 80% success rate
      duration: Math.random() * 1000 + 500,
      details: `Recovery action ${action.name} executed`
    };
  }

  async verifyRecovery(error, context, strategy) {
    // Mock recovery verification
    return Math.random() > 0.3; // 70% success rate
  }

  async attemptFallbackRecovery(error, classification, context) {
    return {
      attempted: true,
      successful: Math.random() > 0.5, // 50% success rate for fallback
      strategy: 'fallback_restart'
    };
  }

  predictErrorsFromPatterns(metrics, context) {
    // Mock pattern-based error prediction
    return [];
  }

  predictErrorsFromThresholds(metrics) {
    // Mock threshold-based error prediction
    return [];
  }

  rankPredictions(predictions) {
    return predictions.sort((a, b) => (b.confidence || 0) - (a.confidence || 0));
  }

  async triggerPreventiveActions(predictions) {
    // Mock preventive action triggering
    console.log(`[ERROR HANDLER] 🛡️ Triggering preventive actions for ${predictions.length} predictions`);
  }

  generateCodeImprovements(error, classification) {
    return [
      { type: 'code', suggestion: 'Add error handling for async operations', impact: 'medium', feasibility: 'high' }
    ];
  }

  generateArchitectureImprovements(error, classification, context) {
    return [
      { type: 'architecture', suggestion: 'Implement circuit breaker pattern', impact: 'high', feasibility: 'medium' }
    ];
  }

  generateProcessImprovements(error, classification) {
    return [
      { type: 'process', suggestion: 'Add automated testing for error scenarios', impact: 'high', feasibility: 'high' }
    ];
  }

  generateMonitoringImprovements(error, classification) {
    return [
      { type: 'monitoring', suggestion: 'Add real-time error rate monitoring', impact: 'medium', feasibility: 'high' }
    ];
  }

  rankImprovementSuggestions(suggestions) {
    return suggestions.sort((a, b) => {
      const scoreA = (a.impact === 'high' ? 3 : a.impact === 'medium' ? 2 : 1) * (a.feasibility === 'high' ? 3 : a.feasibility === 'medium' ? 2 : 1);
      const scoreB = (b.impact === 'high' ? 3 : b.impact === 'medium' ? 2 : 1) * (b.feasibility === 'high' ? 3 : b.feasibility === 'medium' ? 2 : 1);
      return scoreB - scoreA;
    });
  }

  /**
   * Get error handler summary
   */
  getSummary() {
    return {
      status: 'active',
      totalErrors: this.errorAnalytics.errorHistory.length,
      errorCategories: this.errorClassification.categories.size,
      recoveryStrategies: this.autonomousRecovery.recoveryStrategies.size,
      predictiveModels: this.errorPrevention.predictiveModels.size,
      recentErrors: this.errorAnalytics.errorHistory.slice(-5).length,
      globalHandlers: true
    };
  }

  /**
   * Cleanup method
   */
  destroy() {
    console.log('[ERROR HANDLER] 🛑 Advanced error handling system stopped');
  }
}