smartui-migration-tool/lib/simple-commands/suggestion-engine.js

Enterprise-grade CLI tool for migrating visual testing platforms to LambdaTest SmartUI

const { Command, Flags } = require('@oclif/core');
const chalk = require('chalk');
const fs = require('fs-extra');
const path = require('path');
const glob = require('glob');

class SuggestionEngine extends Command {
  static description = 'Generate intelligent suggestions for code improvement and migration';

  static flags = {
    path: Flags.string({
      char: 'p',
      description: 'Path to analyze (default: current directory)',
      default: process.cwd()
    }),
    include: Flags.string({
      char: 'i',
      description: 'File patterns to include (comma-separated)',
      default: '**/*.{js,ts,jsx,tsx,py,java,cs}'
    }),
    exclude: Flags.string({
      char: 'e',
      description: 'File patterns to exclude (comma-separated)',
      default: 'node_modules/**,dist/**,build/**,*.min.js'
    }),
    output: Flags.string({
      char: 'o',
      description: 'Output file for suggestions',
      default: 'suggestions.json'
    }),
    type: Flags.string({
      char: 't',
      description: 'Type of suggestions to generate',
      default: 'all',
      options: ['all', 'quality', 'performance', 'security', 'migration', 'architecture']
    }),
    priority: Flags.string({
      char: 'r',
      description: 'Minimum priority level',
      default: 'medium',
      options: ['low', 'medium', 'high', 'critical']
    }),
    verbose: Flags.boolean({
      char: 'v',
      description: 'Enable verbose output',
      default: false
    })
  };

  async run() {
    const { flags } = await this.parse(SuggestionEngine);
    
    console.log(chalk.blue.bold('\n💡 Intelligent Suggestion Engine'));
    console.log(chalk.gray('Generating smart suggestions for code improvement...\n'));

    try {
      // Create suggestion engine
      const engine = this.createSuggestionEngine();
      
      // Generate suggestions
      const results = await this.generateSuggestions(flags, engine);
      
      // Display results
      this.displayResults(results, flags.verbose);
      
      // Save results
      if (flags.output) {
        await fs.writeJson(flags.output, results, { spaces: 2 });
        console.log(chalk.green(`\n✅ Suggestions saved to: ${flags.output}`));
      }
      
    } catch (error) {
      console.error(chalk.red(`\n❌ Error generating suggestions: ${error.message}`));
      this.exit(1);
    }
  }

  createSuggestionEngine() {
    return {
      // Code Quality Suggestions
      generateQualitySuggestions: (files) => {
        const suggestions = [];
        
        files.forEach(file => {
          if (file.content) {
            // Complexity suggestions
            const complexitySuggestions = this.analyzeComplexity(file);
            suggestions.push(...complexitySuggestions);
            
            // Maintainability suggestions
            const maintainabilitySuggestions = this.analyzeMaintainability(file);
            suggestions.push(...maintainabilitySuggestions);
            
            // Readability suggestions
            const readabilitySuggestions = this.analyzeReadability(file);
            suggestions.push(...readabilitySuggestions);
            
            // Code style suggestions
            const styleSuggestions = this.analyzeCodeStyle(file);
            suggestions.push(...styleSuggestions);
          }
        });
        
        return suggestions;
      },

      // Performance Suggestions
      generatePerformanceSuggestions: (files) => {
        const suggestions = [];
        
        files.forEach(file => {
          if (file.content) {
            // Performance anti-patterns
            const performanceSuggestions = this.analyzePerformance(file);
            suggestions.push(...performanceSuggestions);
            
            // Memory usage suggestions
            const memorySuggestions = this.analyzeMemoryUsage(file);
            suggestions.push(...memorySuggestions);
            
            // Algorithm efficiency suggestions
            const algorithmSuggestions = this.analyzeAlgorithms(file);
            suggestions.push(...algorithmSuggestions);
          }
        });
        
        return suggestions;
      },

      // Security Suggestions
      generateSecuritySuggestions: (files) => {
        const suggestions = [];
        
        files.forEach(file => {
          if (file.content) {
            // Security vulnerabilities
            const securitySuggestions = this.analyzeSecurity(file);
            suggestions.push(...securitySuggestions);
            
            // Input validation suggestions
            const validationSuggestions = this.analyzeInputValidation(file);
            suggestions.push(...validationSuggestions);
            
            // Authentication suggestions
            const authSuggestions = this.analyzeAuthentication(file);
            suggestions.push(...authSuggestions);
          }
        });
        
        return suggestions;
      },

      // Migration Suggestions
      generateMigrationSuggestions: (files) => {
        const suggestions = [];
        
        files.forEach(file => {
          if (file.content) {
            // Visual testing migration
            const visualTestingSuggestions = this.analyzeVisualTesting(file);
            suggestions.push(...visualTestingSuggestions);
            
            // Framework migration
            const frameworkSuggestions = this.analyzeFrameworkMigration(file);
            suggestions.push(...frameworkSuggestions);
            
            // API migration
            const apiSuggestions = this.analyzeAPIMigration(file);
            suggestions.push(...apiSuggestions);
          }
        });
        
        return suggestions;
      },

      // Architecture Suggestions
      generateArchitectureSuggestions: (files) => {
        const suggestions = [];
        
        // Design pattern suggestions
        const patternSuggestions = this.analyzeDesignPatterns(files);
        suggestions.push(...patternSuggestions);
        
        // Modularity suggestions
        const modularitySuggestions = this.analyzeModularity(files);
        suggestions.push(...modularitySuggestions);
        
        // Scalability suggestions
        const scalabilitySuggestions = this.analyzeScalability(files);
        suggestions.push(...scalabilitySuggestions);
        
        return suggestions;
      },

      // Confidence Scoring
      calculateConfidence: (suggestion) => {
        let confidence = 0.5; // Base confidence
        
        // Increase confidence based on evidence
        if (suggestion.evidence && suggestion.evidence.length > 0) {
          confidence += 0.2;
        }
        
        if (suggestion.severity === 'high' || suggestion.severity === 'critical') {
          confidence += 0.1;
        }
        
        if (suggestion.impact === 'high') {
          confidence += 0.1;
        }
        
        return Math.min(confidence, 1.0);
      },

      // Priority Ranking
      calculatePriority: (suggestion) => {
        let priority = 0;
        
        // Base priority from severity
        const severityMap = { low: 1, medium: 2, high: 3, critical: 4 };
        priority += severityMap[suggestion.severity] || 1;
        
        // Increase priority based on impact
        const impactMap = { low: 1, medium: 2, high: 3 };
        priority += impactMap[suggestion.impact] || 1;
        
        // Increase priority based on confidence
        priority += suggestion.confidence * 2;
        
        return priority;
      },

      // Transformation Suggestions
      generateTransformations: (suggestion) => {
        const transformations = [];
        
        if (suggestion.type === 'complexity') {
          transformations.push({
            type: 'refactor',
            description: 'Break down complex function into smaller functions',
            code: this.generateRefactoringCode(suggestion)
          });
        } else if (suggestion.type === 'performance') {
          transformations.push({
            type: 'optimize',
            description: 'Optimize performance bottleneck',
            code: this.generateOptimizationCode(suggestion)
          });
        } else if (suggestion.type === 'security') {
          transformations.push({
            type: 'secure',
            description: 'Implement security best practices',
            code: this.generateSecurityCode(suggestion)
          });
        } else if (suggestion.type === 'migration') {
          transformations.push({
            type: 'migrate',
            description: 'Migrate to recommended solution',
            code: this.generateMigrationCode(suggestion)
          });
        }
        
        return transformations;
      }
    };
  }

  async generateSuggestions(flags, engine) {
    const results = {
      timestamp: new Date().toISOString(),
      path: flags.path,
      type: flags.type,
      priority: flags.priority,
      files: [],
      suggestions: [],
      summary: {}
    };

    // Find files to analyze
    const files = await this.findFiles(flags);
    results.files = files;

    // Generate suggestions based on type
    let allSuggestions = [];
    
    if (flags.type === 'all' || flags.type === 'quality') {
      const qualitySuggestions = engine.generateQualitySuggestions(files);
      allSuggestions.push(...qualitySuggestions);
    }
    
    if (flags.type === 'all' || flags.type === 'performance') {
      const performanceSuggestions = engine.generatePerformanceSuggestions(files);
      allSuggestions.push(...performanceSuggestions);
    }
    
    if (flags.type === 'all' || flags.type === 'security') {
      const securitySuggestions = engine.generateSecuritySuggestions(files);
      allSuggestions.push(...securitySuggestions);
    }
    
    if (flags.type === 'all' || flags.type === 'migration') {
      const migrationSuggestions = engine.generateMigrationSuggestions(files);
      allSuggestions.push(...migrationSuggestions);
    }
    
    if (flags.type === 'all' || flags.type === 'architecture') {
      const architectureSuggestions = engine.generateArchitectureSuggestions(files);
      allSuggestions.push(...architectureSuggestions);
    }

    // Calculate confidence and priority for each suggestion
    allSuggestions.forEach(suggestion => {
      suggestion.confidence = engine.calculateConfidence(suggestion);
      suggestion.priority = engine.calculatePriority(suggestion);
      suggestion.transformations = engine.generateTransformations(suggestion);
    });

    // Filter by priority
    const priorityMap = { low: 1, medium: 2, high: 3, critical: 4 };
    const minPriority = priorityMap[flags.priority] || 2;
    
    results.suggestions = allSuggestions.filter(s => s.priority >= minPriority);
    
    // Sort by priority (descending)
    results.suggestions.sort((a, b) => b.priority - a.priority);

    // Generate summary
    results.summary = this.generateSummary(results.suggestions);

    return results;
  }

  async findFiles(flags) {
    const includePatterns = flags.include.split(',');
    const excludePatterns = flags.exclude.split(',');
    
    const files = [];
    
    for (const pattern of includePatterns) {
      const matches = glob.sync(pattern, {
        cwd: flags.path,
        absolute: true,
        ignore: excludePatterns
      });
      
      files.push(...matches.map(file => ({ path: file })));
    }
    
    // Read file contents
    for (const file of files) {
      try {
        const content = await fs.readFile(file.path, 'utf8');
        const language = this.detectLanguage(file.path);
        
        file.content = content;
        file.language = language;
        file.size = content.length;
        file.lines = content.split('\n').length;
      } catch (error) {
        if (flags.verbose) {
          console.warn(chalk.yellow(`⚠️  Could not read file: ${file.path}`));
        }
      }
    }
    
    return files;
  }

  detectLanguage(filePath) {
    const ext = path.extname(filePath).toLowerCase();
    const languageMap = {
      '.js': 'javascript',
      '.jsx': 'javascript',
      '.ts': 'typescript',
      '.tsx': 'typescript',
      '.py': 'python',
      '.java': 'java',
      '.cs': 'csharp'
    };
    return languageMap[ext] || 'unknown';
  }

  analyzeComplexity(file) {
    const suggestions = [];
    const content = file.content;
    const lines = content.split('\n');
    
    // Check for long functions
    const functionRegex = /function\s+(\w+)\s*\([^)]*\)\s*\{/g;
    let match;
    while ((match = functionRegex.exec(content)) !== null) {
      const functionName = match[1];
      const functionStart = match.index;
      const functionEnd = this.findFunctionEnd(content, functionStart);
      const functionLines = content.substring(functionStart, functionEnd).split('\n').length;
      
      if (functionLines > 50) {
        suggestions.push({
          type: 'complexity',
          severity: 'medium',
          impact: 'medium',
          title: 'Long Function Detected',
          description: `Function '${functionName}' is ${functionLines} lines long`,
          file: file.path,
          line: this.getLineNumber(content, functionStart),
          evidence: [`Function length: ${functionLines} lines`],
          recommendation: 'Consider breaking this function into smaller, more focused functions'
        });
      }
    }
    
    // Check for deep nesting
    const nestingLevel = this.calculateNestingLevel(content);
    if (nestingLevel > 4) {
      suggestions.push({
        type: 'complexity',
        severity: 'high',
        impact: 'high',
        title: 'Deep Nesting Detected',
        description: `Maximum nesting level: ${nestingLevel}`,
        file: file.path,
        evidence: [`Nesting level: ${nestingLevel}`],
        recommendation: 'Refactor to reduce nesting depth and improve readability'
      });
    }
    
    return suggestions;
  }

  analyzeMaintainability(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for magic numbers
    const magicNumberRegex = /\b\d{3,}\b/g;
    const magicNumbers = content.match(magicNumberRegex);
    if (magicNumbers && magicNumbers.length > 5) {
      suggestions.push({
        type: 'maintainability',
        severity: 'medium',
        impact: 'medium',
        title: 'Magic Numbers Detected',
        description: `${magicNumbers.length} magic numbers found`,
        file: file.path,
        evidence: magicNumbers.slice(0, 5),
        recommendation: 'Replace magic numbers with named constants'
      });
    }
    
    // Check for commented code
    const commentedCodeRegex = /\/\/.*\w+.*\(/g;
    const commentedCode = content.match(commentedCodeRegex);
    if (commentedCode && commentedCode.length > 3) {
      suggestions.push({
        type: 'maintainability',
        severity: 'low',
        impact: 'low',
        title: 'Commented Code Detected',
        description: `${commentedCode.length} lines of commented code found`,
        file: file.path,
        evidence: commentedCode.slice(0, 3),
        recommendation: 'Remove commented code or convert to documentation'
      });
    }
    
    return suggestions;
  }

  analyzeReadability(file) {
    const suggestions = [];
    const content = file.content;
    const lines = content.split('\n');
    
    // Check for long lines
    lines.forEach((line, index) => {
      if (line.length > 120) {
        suggestions.push({
          type: 'readability',
          severity: 'low',
          impact: 'low',
          title: 'Long Line Detected',
          description: `Line ${index + 1} is ${line.length} characters long`,
          file: file.path,
          line: index + 1,
          evidence: [line.substring(0, 50) + '...'],
          recommendation: 'Break long lines to improve readability'
        });
      }
    });
    
    // Check for inconsistent naming
    const variableRegex = /(?:let|const|var)\s+([a-zA-Z_][a-zA-Z0-9_]*)/g;
    const variables = [];
    let match;
    while ((match = variableRegex.exec(content)) !== null) {
      variables.push(match[1]);
    }
    
    const namingIssues = this.checkNamingConsistency(variables);
    if (namingIssues.length > 0) {
      suggestions.push({
        type: 'readability',
        severity: 'low',
        impact: 'low',
        title: 'Inconsistent Naming Detected',
        description: `${namingIssues.length} naming inconsistencies found`,
        file: file.path,
        evidence: namingIssues.slice(0, 3),
        recommendation: 'Use consistent naming conventions throughout the codebase'
      });
    }
    
    return suggestions;
  }

  analyzeCodeStyle(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for missing semicolons (JavaScript/TypeScript)
    if (file.language === 'javascript' || file.language === 'typescript') {
      const lines = content.split('\n');
      const missingSemicolons = [];
      
      lines.forEach((line, index) => {
        const trimmedLine = line.trim();
        if (trimmedLine && 
            !trimmedLine.endsWith(';') && 
            !trimmedLine.endsWith('{') && 
            !trimmedLine.endsWith('}') && 
            !trimmedLine.startsWith('//') && 
            !trimmedLine.startsWith('*') &&
            !trimmedLine.startsWith('if') &&
            !trimmedLine.startsWith('for') &&
            !trimmedLine.startsWith('while') &&
            !trimmedLine.startsWith('switch') &&
            !trimmedLine.startsWith('function') &&
            !trimmedLine.startsWith('class')) {
          missingSemicolons.push(index + 1);
        }
      });
      
      if (missingSemicolons.length > 5) {
        suggestions.push({
          type: 'style',
          severity: 'low',
          impact: 'low',
          title: 'Missing Semicolons',
          description: `${missingSemicolons.length} lines missing semicolons`,
          file: file.path,
          evidence: missingSemicolons.slice(0, 5),
          recommendation: 'Add semicolons for consistency and to avoid potential issues'
        });
      }
    }
    
    return suggestions;
  }

  analyzePerformance(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for inefficient loops
    const forLoopRegex = /for\s*\(\s*var\s+(\w+)\s*=\s*0\s*;\s*\1\s*<\s*(\w+)\.length\s*;\s*\1\+\+\)/g;
    let match;
    while ((match = forLoopRegex.exec(content)) !== null) {
      suggestions.push({
        type: 'performance',
        severity: 'medium',
        impact: 'medium',
        title: 'Inefficient Loop Detected',
        description: 'Consider caching array length or using forEach',
        file: file.path,
        line: this.getLineNumber(content, match.index),
        evidence: [match[0]],
        recommendation: 'Cache array length or use forEach for better performance'
      });
    }
    
    // Check for string concatenation in loops
    const stringConcatRegex = /(\w+)\s*\+=\s*['"][^'"]*['"]/g;
    const stringConcats = content.match(stringConcatRegex);
    if (stringConcats && stringConcats.length > 3) {
      suggestions.push({
        type: 'performance',
        severity: 'medium',
        impact: 'medium',
        title: 'String Concatenation in Loop',
        description: 'Consider using array.join() or template literals',
        file: file.path,
        evidence: stringConcats.slice(0, 3),
        recommendation: 'Use array.join() or template literals for better performance'
      });
    }
    
    return suggestions;
  }

  analyzeMemoryUsage(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for potential memory leaks
    const eventListenerRegex = /addEventListener\s*\([^,]+,\s*[^)]+\)/g;
    const eventListeners = content.match(eventListenerRegex);
    if (eventListeners && eventListeners.length > 5) {
      suggestions.push({
        type: 'performance',
        severity: 'medium',
        impact: 'medium',
        title: 'Multiple Event Listeners',
        description: `${eventListeners.length} event listeners found`,
        file: file.path,
        evidence: eventListeners.slice(0, 3),
        recommendation: 'Ensure event listeners are properly removed to prevent memory leaks'
      });
    }
    
    return suggestions;
  }

  analyzeAlgorithms(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for O(n²) algorithms
    const nestedLoopRegex = /for\s*\([^)]+\)\s*\{[^}]*for\s*\([^)]+\)\s*\{/g;
    if (nestedLoopRegex.test(content)) {
      suggestions.push({
        type: 'performance',
        severity: 'medium',
        impact: 'medium',
        title: 'Nested Loops Detected',
        description: 'Consider optimizing nested loops for better performance',
        file: file.path,
        evidence: ['Nested loop structure detected'],
        recommendation: 'Consider using more efficient algorithms or data structures'
      });
    }
    
    return suggestions;
  }

  analyzeSecurity(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for eval usage
    if (content.includes('eval(')) {
      suggestions.push({
        type: 'security',
        severity: 'critical',
        impact: 'high',
        title: 'eval() Usage Detected',
        description: 'eval() can be dangerous and should be avoided',
        file: file.path,
        evidence: ['eval() function found'],
        recommendation: 'Replace eval() with safer alternatives like JSON.parse() or Function constructor'
      });
    }
    
    // Check for innerHTML usage
    if (content.includes('innerHTML')) {
      suggestions.push({
        type: 'security',
        severity: 'high',
        impact: 'high',
        title: 'innerHTML Usage Detected',
        description: 'innerHTML can lead to XSS vulnerabilities',
        file: file.path,
        evidence: ['innerHTML property found'],
        recommendation: 'Use textContent or createElement for safer DOM manipulation'
      });
    }
    
    return suggestions;
  }

  analyzeInputValidation(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for missing input validation
    const inputRegex = /input\s*\[[^\]]+\]/g;
    const inputs = content.match(inputRegex);
    if (inputs && inputs.length > 0) {
      const hasValidation = content.includes('validate') || content.includes('check') || content.includes('test');
      if (!hasValidation) {
        suggestions.push({
          type: 'security',
          severity: 'high',
          impact: 'high',
          title: 'Missing Input Validation',
          description: 'Input validation not detected',
          file: file.path,
          evidence: ['Input access without validation'],
          recommendation: 'Add proper input validation and sanitization'
        });
      }
    }
    
    return suggestions;
  }

  analyzeAuthentication(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for hardcoded credentials
    const credentialRegex = /(?:password|secret|key|token)\s*[:=]\s*['"][^'"]+['"]/gi;
    const credentials = content.match(credentialRegex);
    if (credentials && credentials.length > 0) {
      suggestions.push({
        type: 'security',
        severity: 'critical',
        impact: 'high',
        title: 'Hardcoded Credentials Detected',
        description: 'Hardcoded credentials found in code',
        file: file.path,
        evidence: credentials.slice(0, 3),
        recommendation: 'Move credentials to environment variables or secure configuration'
      });
    }
    
    return suggestions;
  }

  analyzeVisualTesting(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for Percy usage
    if (content.includes('percy') || content.includes('Percy')) {
      suggestions.push({
        type: 'migration',
        severity: 'high',
        impact: 'high',
        title: 'Percy Visual Testing Detected',
        description: 'Percy visual testing code found',
        file: file.path,
        evidence: ['Percy API usage detected'],
        recommendation: 'Consider migrating to SmartUI for better performance and features'
      });
    }
    
    // Check for Applitools usage
    if (content.includes('applitools') || content.includes('eyes')) {
      suggestions.push({
        type: 'migration',
        severity: 'high',
        impact: 'high',
        title: 'Applitools Visual Testing Detected',
        description: 'Applitools visual testing code found',
        file: file.path,
        evidence: ['Applitools API usage detected'],
        recommendation: 'Consider migrating to SmartUI for better performance and features'
      });
    }
    
    return suggestions;
  }

  analyzeFrameworkMigration(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for outdated framework usage
    if (content.includes('jQuery') && !content.includes('$')) {
      suggestions.push({
        type: 'migration',
        severity: 'medium',
        impact: 'medium',
        title: 'jQuery Usage Detected',
        description: 'Consider migrating to modern frameworks',
        file: file.path,
        evidence: ['jQuery library usage'],
        recommendation: 'Consider migrating to React, Vue, or Angular for better maintainability'
      });
    }
    
    return suggestions;
  }

  analyzeAPIMigration(file) {
    const suggestions = [];
    const content = file.content;
    
    // Check for deprecated API usage
    if (content.includes('XMLHttpRequest') && !content.includes('fetch')) {
      suggestions.push({
        type: 'migration',
        severity: 'medium',
        impact: 'medium',
        title: 'XMLHttpRequest Usage Detected',
        description: 'Consider using modern fetch API',
        file: file.path,
        evidence: ['XMLHttpRequest usage'],
        recommendation: 'Migrate to fetch API for better promise support and cleaner code'
      });
    }
    
    return suggestions;
  }

  analyzeDesignPatterns(files) {
    const suggestions = [];
    
    // Check for singleton pattern usage
    const hasSingleton = files.some(f => 
      f.content && f.content.includes('getInstance') && f.content.includes('static')
    );
    
    if (hasSingleton) {
      suggestions.push({
        type: 'architecture',
        severity: 'low',
        impact: 'low',
        title: 'Singleton Pattern Detected',
        description: 'Consider if singleton is the right pattern for your use case',
        evidence: ['Singleton pattern implementation found'],
        recommendation: 'Evaluate if singleton is necessary or if dependency injection would be better'
      });
    }
    
    return suggestions;
  }

  analyzeModularity(files) {
    const suggestions = [];
    
    // Check for large files
    const largeFiles = files.filter(f => f.content && f.content.length > 10000);
    if (largeFiles.length > 0) {
      suggestions.push({
        type: 'architecture',
        severity: 'medium',
        impact: 'medium',
        title: 'Large Files Detected',
        description: `${largeFiles.length} files are larger than 10KB`,
        evidence: largeFiles.map(f => `${path.basename(f.path)}: ${f.content.length} characters`),
        recommendation: 'Consider breaking large files into smaller, more focused modules'
      });
    }
    
    return suggestions;
  }

  analyzeScalability(files) {
    const suggestions = [];
    
    // Check for synchronous operations
    const syncOps = files.filter(f => 
      f.content && (f.content.includes('sync') || f.content.includes('Sync'))
    );
    
    if (syncOps.length > 0) {
      suggestions.push({
        type: 'architecture',
        severity: 'medium',
        impact: 'medium',
        title: 'Synchronous Operations Detected',
        description: 'Consider using asynchronous operations for better scalability',
        evidence: ['Synchronous operations found'],
        recommendation: 'Replace synchronous operations with async/await or promises where possible'
      });
    }
    
    return suggestions;
  }

  checkNamingConsistency(variables) {
    const issues = [];
    const camelCase = /^[a-z][a-zA-Z0-9]*$/;
    const snakeCase = /^[a-z][a-z0-9_]*$/;
    const pascalCase = /^[A-Z][a-zA-Z0-9]*$/;
    
    const namingStyles = {
      camelCase: variables.filter(v => camelCase.test(v)).length,
      snakeCase: variables.filter(v => snakeCase.test(v)).length,
      pascalCase: variables.filter(v => pascalCase.test(v)).length
    };
    
    const total = variables.length;
    const dominantStyle = Object.entries(namingStyles).reduce((a, b) => 
      namingStyles[a[0]] > namingStyles[b[0]] ? a : b
    )[0];
    
    variables.forEach(variable => {
      if (dominantStyle === 'camelCase' && !camelCase.test(variable)) {
        issues.push(variable);
      } else if (dominantStyle === 'snakeCase' && !snakeCase.test(variable)) {
        issues.push(variable);
      } else if (dominantStyle === 'pascalCase' && !pascalCase.test(variable)) {
        issues.push(variable);
      }
    });
    
    return issues;
  }

  calculateNestingLevel(content) {
    let maxNesting = 0;
    let currentNesting = 0;
    
    for (let i = 0; i < content.length; i++) {
      if (content[i] === '{') {
        currentNesting++;
        maxNesting = Math.max(maxNesting, currentNesting);
      } else if (content[i] === '}') {
        currentNesting--;
      }
    }
    
    return maxNesting;
  }

  findFunctionEnd(content, start) {
    let braceCount = 0;
    let i = start;
    
    while (i < content.length) {
      if (content[i] === '{') {
        braceCount++;
      } else if (content[i] === '}') {
        braceCount--;
        if (braceCount === 0) {
          return i + 1;
        }
      }
      i++;
    }
    
    return content.length;
  }

  getLineNumber(content, position) {
    return content.substring(0, position).split('\n').length;
  }

  generateRefactoringCode(suggestion) {
    return `// Refactored version of ${suggestion.title}
// Break down complex function into smaller, focused functions

function processData(data) {
  const validatedData = validateData(data);
  const processedData = transformData(validatedData);
  return processedData;
}

function validateData(data) {
  // Validation logic here
  return data;
}

function transformData(data) {
  // Transformation logic here
  return data;
}`;
  }

  generateOptimizationCode(suggestion) {
    return `// Optimized version for better performance
// Cache array length and use efficient algorithms

// Before: for (var i = 0; i < array.length; i++)
// After:
const length = array.length;
for (let i = 0; i < length; i++) {
  // Process array[i]
}

// Or use forEach for better readability
array.forEach((item, index) => {
  // Process item
});`;
  }

  generateSecurityCode(suggestion) {
    return `// Secure implementation
// Replace dangerous functions with safe alternatives

// Instead of eval():
const result = JSON.parse(jsonString);

// Instead of innerHTML:
element.textContent = userInput;
// Or use createElement for safe DOM manipulation
const div = document.createElement('div');
div.textContent = userInput;`;
  }

  generateMigrationCode(suggestion) {
    return `// Migration to SmartUI
// Replace Percy/Applitools with SmartUI

// Before (Percy):
// percy.snapshot('Homepage');

// After (SmartUI):
await smartui.snapshot('Homepage', {
  name: 'Homepage',
  fullPage: true
});`;
  }

  generateSummary(suggestions) {
    const summary = {
      total: suggestions.length,
      byType: {},
      bySeverity: {},
      byImpact: {},
      topSuggestions: suggestions.slice(0, 5)
    };
    
    suggestions.forEach(suggestion => {
      // Count by type
      summary.byType[suggestion.type] = (summary.byType[suggestion.type] || 0) + 1;
      
      // Count by severity
      summary.bySeverity[suggestion.severity] = (summary.bySeverity[suggestion.severity] || 0) + 1;
      
      // Count by impact
      summary.byImpact[suggestion.impact] = (summary.byImpact[suggestion.impact] || 0) + 1;
    });
    
    return summary;
  }

  displayResults(results, verbose) {
    console.log(chalk.green.bold('\n💡 Suggestion Engine Results'));
    console.log(chalk.gray('=' * 50));
    
    // Summary
    console.log(chalk.blue.bold('\n📊 Summary:'));
    console.log(`  Total suggestions: ${results.summary.total}`);
    console.log(`  Files analyzed: ${results.files.length}`);
    
    // By Type
    console.log(chalk.blue.bold('\n📋 By Type:'));
    Object.entries(results.summary.byType).forEach(([type, count]) => {
      console.log(`  ${type}: ${count}`);
    });
    
    // By Severity
    console.log(chalk.blue.bold('\n⚠️  By Severity:'));
    Object.entries(results.summary.bySeverity).forEach(([severity, count]) => {
      const color = severity === 'critical' ? chalk.red : 
                   severity === 'high' ? chalk.yellow : 
                   severity === 'medium' ? chalk.blue : chalk.green;
      console.log(`  ${color(severity)}: ${count}`);
    });
    
    // Top Suggestions
    console.log(chalk.blue.bold('\n🎯 Top Suggestions:'));
    results.summary.topSuggestions.forEach((suggestion, index) => {
      const severityColor = suggestion.severity === 'critical' ? chalk.red : 
                           suggestion.severity === 'high' ? chalk.yellow : 
                           suggestion.severity === 'medium' ? chalk.blue : chalk.green;
      
      console.log(`  ${index + 1}. ${severityColor(suggestion.title)} (${suggestion.severity})`);
      console.log(`     ${suggestion.description}`);
      console.log(`     File: ${path.basename(suggestion.file)}`);
      console.log(`     Confidence: ${(suggestion.confidence * 100).toFixed(1)}%`);
      console.log(`     Priority: ${suggestion.priority.toFixed(1)}`);
      console.log('');
    });
    
    if (verbose) {
      console.log(chalk.blue.bold('\n🔍 Detailed Suggestions:'));
      results.suggestions.forEach((suggestion, index) => {
        console.log(`\n${index + 1}. ${suggestion.title}`);
        console.log(`   Type: ${suggestion.type}`);
        console.log(`   Severity: ${suggestion.severity}`);
        console.log(`   Impact: ${suggestion.impact}`);
        console.log(`   Confidence: ${(suggestion.confidence * 100).toFixed(1)}%`);
        console.log(`   Priority: ${suggestion.priority.toFixed(1)}`);
        console.log(`   File: ${suggestion.file}`);
        if (suggestion.line) {
          console.log(`   Line: ${suggestion.line}`);
        }
        console.log(`   Description: ${suggestion.description}`);
        console.log(`   Recommendation: ${suggestion.recommendation}`);
        
        if (suggestion.evidence && suggestion.evidence.length > 0) {
          console.log(`   Evidence: ${suggestion.evidence.join(', ')}`);
        }
        
        if (suggestion.transformations && suggestion.transformations.length > 0) {
          console.log(`   Transformations:`);
          suggestion.transformations.forEach((transformation, tIndex) => {
            console.log(`     ${tIndex + 1}. ${transformation.description}`);
          });
        }
      });
    }
  }
}

module.exports.default = SuggestionEngine;