import { EventEmitter } from 'events';
import { GitHubRepository } from './github-coordinator.js';
import { GitHubUser } from './pull-request-manager.js';

// Types and Interfaces
export interface RepositoryStructure {
  repositoryId: string;
  analysisId: string;
  timestamp: Date;
  structure: DirectoryNode;
  metrics: StructureMetrics;
  patterns: ArchitecturalPattern[];
  violations: StructureViolation[];
  recommendations: StructureRecommendation[];
  complianceScore: number;
  techStack: TechnologyStack;
  dependencies: DependencyAnalysis;
}

export interface DirectoryNode {
  name: string;
  path: string;
  type: 'directory' | 'file';
  size: number;
  children: DirectoryNode[];
  metadata: FileMetadata;
  purpose: string;
  importance: 'critical' | 'important' | 'optional' | 'deprecated';
}

export interface FileMetadata {
  language: string;
  lines: number;
  complexity: number;
  maintainabilityIndex: number;
  lastModified: Date;
  author: GitHubUser;
  changeFrequency: number;
  testCoverage?: number;
  dependencies: string[];
  exports: string[];
  imports: string[];
}

export interface StructureMetrics {
  totalFiles: number;
  totalDirectories: number;
  averageFileSize: number;
  largestFile: string;
  deepestNesting: number;
  duplicateFiles: DuplicateFile[];
  codeToTestRatio: number;
  organizationScore: number;
  maintainabilityScore: number;
  complexityScore: number;
}

export interface DuplicateFile {
  files: string[];
  similarity: number;
  type: 'exact' | 'near' | 'structural';
  recommendation: string;
}

export interface ArchitecturalPattern {
  name: string;
  type: 'mvc' | 'mvp' | 'mvvm' | 'microservices' | 'monolithic' | 'layered' | 'hexagonal' | 'clean';
  confidence: number;
  implementation: PatternImplementation;
  adherence: number;
  violations: PatternViolation[];
  benefits: string[];
  improvements: string[];
}

export interface PatternImplementation {
  directories: string[];
  conventions: Convention[];
  separationOfConcerns: number;
  cohesion: number;
  coupling: number;
}

export interface Convention {
  type: 'naming' | 'structure' | 'organization' | 'testing';
  description: string;
  adherence: number;
  violations: string[];
  examples: string[];
}

export interface PatternViolation {
  type: string;
  severity: 'low' | 'medium' | 'high' | 'critical';
  location: string;
  description: string;
  impact: string;
  suggestion: string;
}

export interface StructureViolation {
  id: string;
  type: 'naming' | 'organization' | 'dependency' | 'coupling' | 'cohesion' | 'complexity';
  severity: 'low' | 'medium' | 'high' | 'critical';
  file: string;
  line?: number;
  description: string;
  impact: string;
  recommendation: string;
  autoFixable: boolean;
  category: string;
}

export interface StructureRecommendation {
  id: string;
  type: 'refactoring' | 'reorganization' | 'standardization' | 'optimization' | 'modernization';
  priority: number;
  title: string;
  description: string;
  rationale: string;
  implementation: ImplementationPlan;
  impact: ImpactAssessment;
  effort: EffortEstimate;
  dependencies: string[];
  alternatives: Alternative[];
}

export interface ImplementationPlan {
  steps: ImplementationStep[];
  estimatedDuration: number;
  complexity: 'low' | 'medium' | 'high';
  risks: Risk[];
  prerequisites: string[];
  validation: ValidationCriteria[];
}

export interface ImplementationStep {
  order: number;
  description: string;
  action: 'move' | 'rename' | 'create' | 'delete' | 'modify' | 'split' | 'merge';
  target: string;
  newLocation?: string;
  automated: boolean;
  command?: string;
  validation: string;
}

export interface ImpactAssessment {
  buildBreaking: boolean;
  testBreaking: boolean;
  userFacing: boolean;
  performanceImpact: 'positive' | 'neutral' | 'negative';
  maintainabilityImpact: 'positive' | 'neutral' | 'negative';
  securityImpact: 'positive' | 'neutral' | 'negative';
  affectedSystems: string[];
}

export interface EffortEstimate {
  hours: number;
  complexity: 'trivial' | 'simple' | 'moderate' | 'complex' | 'expert';
  skillsRequired: string[];
  toolsRequired: string[];
  teamSize: number;
}

export interface Alternative {
  name: string;
  description: string;
  pros: string[];
  cons: string[];
  effort: number;
  impact: string;
}

export interface Risk {
  description: string;
  probability: number;
  impact: number;
  mitigation: string;
  contingency: string;
}

export interface ValidationCriteria {
  description: string;
  automated: boolean;
  command?: string;
  expectedResult: string;
}

export interface TechnologyStack {
  languages: LanguageUsage[];
  frameworks: FrameworkUsage[];
  tools: ToolUsage[];
  platforms: string[];
  databases: string[];
  cloudServices: string[];
  buildTools: string[];
  testingFrameworks: string[];
  linters: string[];
  packageManagers: string[];
}

export interface LanguageUsage {
  language: string;
  percentage: number;
  files: number;
  lines: number;
  version?: string;
  modern: boolean;
  deprecated: boolean;
}

export interface FrameworkUsage {
  framework: string;
  version: string;
  files: number;
  current: boolean;
  supported: boolean;
  securityIssues: SecurityIssue[];
  updateAvailable: boolean;
  usage: 'primary' | 'secondary' | 'legacy' | 'deprecated';
}

export interface ToolUsage {
  tool: string;
  purpose: string;
  version: string;
  configured: boolean;
  recommended: boolean;
}

export interface SecurityIssue {
  id: string;
  severity: 'low' | 'medium' | 'high' | 'critical';
  description: string;
  cve?: string;
  fix: string;
}

export interface DependencyAnalysis {
  totalDependencies: number;
  directDependencies: number;
  transitiveDependencies: number;
  outdatedDependencies: OutdatedDependency[];
  vulnerableDependencies: VulnerableDependency[];
  unusedDependencies: string[];
  circularDependencies: CircularDependency[];
  dependencyTree: DependencyNode;
  licenseCompliance: LicenseCompliance;
  bundleSize: BundleAnalysis;
}

export interface OutdatedDependency {
  name: string;
  current: string;
  latest: string;
  majorUpdate: boolean;
  breakingChanges: string[];
  updateRecommended: boolean;
  securityUpdate: boolean;
}

export interface VulnerableDependency {
  name: string;
  version: string;
  vulnerabilities: SecurityIssue[];
  patchAvailable: boolean;
  severity: 'low' | 'medium' | 'high' | 'critical';
}

export interface CircularDependency {
  cycle: string[];
  type: 'import' | 'module' | 'package';
  impact: string;
  resolution: string;
}

export interface DependencyNode {
  name: string;
  version: string;
  dependencies: DependencyNode[];
  devDependency: boolean;
  peerDependency: boolean;
  optional: boolean;
}

export interface LicenseCompliance {
  compliant: boolean;
  issues: LicenseIssue[];
  incompatibleLicenses: string[];
  recommendedActions: string[];
}

export interface LicenseIssue {
  dependency: string;
  license: string;
  issue: string;
  severity: 'low' | 'medium' | 'high';
  recommendation: string;
}

export interface BundleAnalysis {
  totalSize: number;
  gzippedSize: number;
  largestDependencies: { name: string; size: number }[];
  duplicates: string[];
  treeShakeable: boolean;
  optimizationOpportunities: OptimizationOpportunity[];
}

export interface OptimizationOpportunity {
  type: 'tree_shaking' | 'code_splitting' | 'lazy_loading' | 'bundle_splitting';
  description: string;
  potentialSavings: number;
  effort: 'low' | 'medium' | 'high';
  implementation: string;
}

export interface ComplianceCheck {
  checkId: string;
  category: 'security' | 'quality' | 'licensing' | 'accessibility' | 'performance' | 'standards';
  name: string;
  description: string;
  status: 'passed' | 'failed' | 'warning' | 'not_applicable';
  score: number;
  details: ComplianceDetail[];
  remediation: string[];
  references: string[];
}

export interface ComplianceDetail {
  item: string;
  status: 'passed' | 'failed' | 'warning';
  message: string;
  location?: string;
  severity: 'low' | 'medium' | 'high' | 'critical';
}

export interface CodeOrganizationAnalysis {
  analysisId: string;
  repository: GitHubRepository;
  timestamp: Date;
  organization: OrganizationScore;
  modularity: ModularityAnalysis;
  cohesion: CohesionAnalysis;
  coupling: CouplingAnalysis;
  complexity: ComplexityAnalysis;
  duplication: DuplicationAnalysis;
  recommendations: OrganizationRecommendation[];
}

export interface OrganizationScore {
  overall: number;
  structure: number;
  naming: number;
  grouping: number;
  separation: number;
  consistency: number;
}

export interface ModularityAnalysis {
  score: number;
  modules: ModuleInfo[];
  interfaces: InterfaceAnalysis[];
  boundaries: BoundaryViolation[];
}

export interface ModuleInfo {
  name: string;
  path: string;
  size: number;
  cohesion: number;
  coupling: number;
  responsibility: string;
  dependencies: string[];
  dependents: string[];
}

export interface InterfaceAnalysis {
  module: string;
  publicInterface: string[];
  privateImplementation: string[];
  exposureLevel: number;
  stability: number;
}

export interface BoundaryViolation {
  type: 'layer' | 'module' | 'domain';
  source: string;
  target: string;
  violation: string;
  impact: string;
}

export interface CohesionAnalysis {
  score: number;
  modules: { name: string; cohesion: number }[];
  lowCohesionModules: string[];
  recommendations: string[];
}

export interface CouplingAnalysis {
  score: number;
  afferentCoupling: { module: string; coupling: number }[];
  efferentCoupling: { module: string; coupling: number }[];
  instability: { module: string; instability: number }[];
  highCouplingPairs: CouplingPair[];
}

export interface CouplingPair {
  source: string;
  target: string;
  strength: number;
  type: 'data' | 'control' | 'content' | 'common' | 'external';
  recommendation: string;
}

export interface ComplexityAnalysis {
  cyclomaticComplexity: number;
  cognitiveComplexity: number;
  halsteadComplexity: number;
  maintainabilityIndex: number;
  complexFiles: ComplexFile[];
  recommendations: string[];
}

export interface ComplexFile {
  file: string;
  complexity: number;
  type: 'cyclomatic' | 'cognitive' | 'halstead';
  recommendation: string;
}

export interface DuplicationAnalysis {
  duplicatedLines: number;
  duplicatedFiles: number;
  duplicationPercentage: number;
  duplicateBlocks: DuplicateBlock[];
  recommendations: string[];
}

export interface DuplicateBlock {
  files: string[];
  lines: number;
  similarity: number;
  type: 'exact' | 'structural' | 'functional';
  refactoringOpportunity: string;
}

export interface OrganizationRecommendation {
  id: string;
  type: 'structure' | 'naming' | 'grouping' | 'separation' | 'modularization';
  priority: number;
  title: string;
  description: string;
  currentState: string;
  proposedState: string;
  rationale: string;
  implementation: ImplementationPlan;
  benefits: string[];
  risks: string[];
}

export interface RepositoryArchitectConfig {
  analysisDepth: 'basic' | 'detailed' | 'comprehensive';
  includeDependencyAnalysis: boolean;
  includeSecurityAnalysis: boolean;
  includeComplianceChecks: boolean;
  complianceStandards: string[];
  architecturalPatterns: string[];
  codeQualityThresholds: QualityThresholds;
  organizationRules: OrganizationRule[];
  automatedFixes: boolean;
  reportFormat: 'json' | 'markdown' | 'html' | 'pdf';
}

export interface QualityThresholds {
  maintainabilityIndex: number;
  cyclomaticComplexity: number;
  codeToTestRatio: number;
  duplicationPercentage: number;
  dependencyCount: number;
  fileSize: number;
  nestingDepth: number;
}

export interface OrganizationRule {
  id: string;
  name: string;
  description: string;
  pattern: string;
  severity: 'error' | 'warning' | 'info';
  category: string;
  autoFixable: boolean;
}

/**
 * Enterprise-grade Repository Architect
 * 
 * Provides comprehensive repository analysis and optimization capabilities including:
 * - Deep structure analysis and architectural pattern detection
 * - Dependency analysis with security and license compliance
 * - Code organization recommendations and automated refactoring
 * - Compliance checking against industry standards
 * - Performance optimization and maintainability improvements
 */
export class RepositoryArchitect extends EventEmitter {
  private config: RepositoryArchitectConfig;
  private structures: Map<string, RepositoryStructure> = new Map();
  private organizations: Map<string, CodeOrganizationAnalysis> = new Map();
  private complianceResults: Map<string, ComplianceCheck[]> = new Map();
  private performanceMetrics: Map<string, any> = new Map();

  constructor(config: RepositoryArchitectConfig) {
    super();
    this.config = config;
    this.setupEventHandlers();
  }

  private setupEventHandlers(): void {
    this.on('analysis-started', this.handleAnalysisStarted.bind(this));
    this.on('analysis-completed', this.handleAnalysisCompleted.bind(this));
    this.on('violation-detected', this.handleViolationDetected.bind(this));
    this.on('recommendation-generated', this.handleRecommendationGenerated.bind(this));
  }

  // Repository Structure Analysis
  async analyzeRepositoryStructure(repository: GitHubRepository): Promise<RepositoryStructure> {
    const analysisId = `analysis_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    this.emit('analysis-started', { repository, analysisId, type: 'structure' });

    try {
      // Build directory structure
      const structure = await this.buildDirectoryStructure(repository);
      
      // Calculate metrics
      const metrics = await this.calculateStructureMetrics(structure);
      
      // Detect architectural patterns
      const patterns = await this.detectArchitecturalPatterns(structure);
      
      // Find violations
      const violations = await this.findStructureViolations(structure, patterns);
      
      // Generate recommendations
      const recommendations = await this.generateStructureRecommendations(structure, violations, patterns);
      
      // Analyze technology stack
      const techStack = await this.analyzeTechnologyStack(structure);
      
      // Analyze dependencies
      const dependencies = this.config.includeDependencyAnalysis 
        ? await this.analyzeDependencies(repository)
        : this.createEmptyDependencyAnalysis();
      
      // Calculate compliance score
      const complianceScore = await this.calculateComplianceScore(violations, patterns);

      const repositoryStructure: RepositoryStructure = {
        repositoryId: repository.fullName,
        analysisId,
        timestamp: new Date(),
        structure,
        metrics,
        patterns,
        violations,
        recommendations,
        complianceScore,
        techStack,
        dependencies
      };

      this.structures.set(analysisId, repositoryStructure);
      this.emit('analysis-completed', { repository, analysis: repositoryStructure });

      return repositoryStructure;

    } catch (error) {
      this.emit('analysis-failed', { repository, analysisId, error });
      throw error;
    }
  }

  // Code Organization Analysis
  async analyzeCodeOrganization(repository: GitHubRepository): Promise<CodeOrganizationAnalysis> {
    const analysisId = `org_analysis_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    this.emit('analysis-started', { repository, analysisId, type: 'organization' });

    try {
      // Analyze overall organization
      const organization = await this.analyzeOrganizationScore(repository);
      
      // Analyze modularity
      const modularity = await this.analyzeModularity(repository);
      
      // Analyze cohesion
      const cohesion = await this.analyzeCohesion(repository);
      
      // Analyze coupling
      const coupling = await this.analyzeCoupling(repository);
      
      // Analyze complexity
      const complexity = await this.analyzeComplexity(repository);
      
      // Analyze code duplication
      const duplication = await this.analyzeDuplication(repository);
      
      // Generate organization recommendations
      const recommendations = await this.generateOrganizationRecommendations(
        organization, modularity, cohesion, coupling, complexity, duplication
      );

      const organizationAnalysis: CodeOrganizationAnalysis = {
        analysisId,
        repository,
        timestamp: new Date(),
        organization,
        modularity,
        cohesion,
        coupling,
        complexity,
        duplication,
        recommendations
      };

      this.organizations.set(analysisId, organizationAnalysis);
      this.emit('analysis-completed', { repository, analysis: organizationAnalysis });

      return organizationAnalysis;

    } catch (error) {
      this.emit('analysis-failed', { repository, analysisId, error });
      throw error;
    }
  }

  // Compliance Checking
  async performComplianceCheck(repository: GitHubRepository): Promise<ComplianceCheck[]> {
    if (!this.config.includeComplianceChecks) {
      return [];
    }

    this.emit('compliance-check-started', repository);

    try {
      const checks: ComplianceCheck[] = [];

      for (const standard of this.config.complianceStandards) {
        const check = await this.performStandardCheck(repository, standard);
        checks.push(check);
      }

      this.complianceResults.set(repository.fullName, checks);
      this.emit('compliance-check-completed', { repository, checks });

      return checks;

    } catch (error) {
      this.emit('compliance-check-failed', { repository, error });
      throw error;
    }
  }

  // Dependency Analysis
  async analyzeDependencies(repository: GitHubRepository): Promise<DependencyAnalysis> {
    this.emit('dependency-analysis-started', repository);

    try {
      // Parse package files
      const packageFiles = await this.findPackageFiles(repository);
      
      // Build dependency tree
      const dependencyTree = await this.buildDependencyTree(packageFiles);
      
      // Find outdated dependencies
      const outdatedDependencies = await this.findOutdatedDependencies(dependencyTree);
      
      // Find vulnerable dependencies
      const vulnerableDependencies = await this.findVulnerableDependencies(dependencyTree);
      
      // Find unused dependencies
      const unusedDependencies = await this.findUnusedDependencies(repository, dependencyTree);
      
      // Find circular dependencies
      const circularDependencies = await this.findCircularDependencies(repository);
      
      // Check license compliance
      const licenseCompliance = await this.checkLicenseCompliance(dependencyTree);
      
      // Analyze bundle size
      const bundleSize = await this.analyzeBundleSize(repository, dependencyTree);

      const analysis: DependencyAnalysis = {
        totalDependencies: this.countTotalDependencies(dependencyTree),
        directDependencies: this.countDirectDependencies(dependencyTree),
        transitiveDependencies: this.countTransitiveDependencies(dependencyTree),
        outdatedDependencies,
        vulnerableDependencies,
        unusedDependencies,
        circularDependencies,
        dependencyTree,
        licenseCompliance,
        bundleSize
      };

      this.emit('dependency-analysis-completed', { repository, analysis });
      return analysis;

    } catch (error) {
      this.emit('dependency-analysis-failed', { repository, error });
      throw error;
    }
  }

  // Optimization Recommendations
  async generateOptimizationPlan(repository: GitHubRepository): Promise<StructureRecommendation[]> {
    const structure = await this.analyzeRepositoryStructure(repository);
    const organization = await this.analyzeCodeOrganization(repository);
    
    const optimizations: StructureRecommendation[] = [];
    
    // Structure optimizations
    optimizations.push(...structure.recommendations);
    
    // Organization optimizations
    optimizations.push(...organization.recommendations.map(this.convertToStructureRecommendation));
    
    // Dependency optimizations
    if (structure.dependencies.bundleSize.optimizationOpportunities.length > 0) {
      optimizations.push(...this.generateDependencyOptimizations(structure.dependencies));
    }
    
    // Performance optimizations
    optimizations.push(...await this.generatePerformanceOptimizations(repository));
    
    // Security optimizations
    optimizations.push(...await this.generateSecurityOptimizations(repository));
    
    // Sort by priority and impact
    optimizations.sort((a, b) => b.priority - a.priority);
    
    this.emit('optimization-plan-generated', { repository, optimizations });
    return optimizations;
  }

  // Automated Refactoring
  async applyAutomatedFixes(repository: GitHubRepository, recommendations: string[]): Promise<boolean> {
    if (!this.config.automatedFixes) {
      throw new Error('Automated fixes are disabled');
    }

    this.emit('automated-fixes-started', { repository, recommendations });

    try {
      for (const recommendationId of recommendations) {
        await this.applyRecommendation(repository, recommendationId);
      }

      this.emit('automated-fixes-completed', { repository, recommendations });
      return true;

    } catch (error) {
      this.emit('automated-fixes-failed', { repository, recommendations, error });
      return false;
    }
  }

  // Analytics and Reporting
  async generateArchitectureReport(repository: GitHubRepository): Promise<any> {
    const structure = await this.analyzeRepositoryStructure(repository);
    const organization = await this.analyzeCodeOrganization(repository);
    const compliance = await this.performComplianceCheck(repository);

    const report = {
      repository: repository.fullName,
      timestamp: new Date(),
      summary: {
        overallScore: this.calculateOverallScore(structure, organization, compliance),
        structureScore: structure.complianceScore,
        organizationScore: organization.organization.overall,
        complianceScore: this.calculateComplianceScore(structure.violations, structure.patterns),
        recommendationCount: structure.recommendations.length + organization.recommendations.length
      },
      structure: {
        metrics: structure.metrics,
        patterns: structure.patterns,
        violations: structure.violations.filter(v => v.severity === 'high' || v.severity === 'critical'),
        techStack: structure.techStack
      },
      organization: {
        modularity: organization.modularity.score,
        cohesion: organization.cohesion.score,
        coupling: organization.coupling.score,
        complexity: organization.complexity.maintainabilityIndex,
        duplication: organization.duplication.duplicationPercentage
      },
      dependencies: {
        total: structure.dependencies.totalDependencies,
        outdated: structure.dependencies.outdatedDependencies.length,
        vulnerable: structure.dependencies.vulnerableDependencies.length,
        unused: structure.dependencies.unusedDependencies.length,
        licenseIssues: structure.dependencies.licenseCompliance.issues.length
      },
      compliance: compliance.reduce((acc, check) => {
        acc[check.category] = check.status;
        return acc;
      }, {} as Record<string, string>),
      recommendations: [
        ...structure.recommendations.slice(0, 10), // Top 10 structure recommendations
        ...organization.recommendations.slice(0, 10) // Top 10 organization recommendations
      ].sort((a, b) => b.priority - a.priority)
    };

    this.emit('architecture-report-generated', report);
    return report;
  }

  // Private Implementation Methods

  private async buildDirectoryStructure(repository: GitHubRepository): Promise<DirectoryNode> {
    // Simulate building directory structure from repository
    const rootNode: DirectoryNode = {
      name: repository.name,
      path: '/',
      type: 'directory',
      size: 0,
      children: [
        {
          name: 'src',
          path: '/src',
          type: 'directory',
          size: 0,
          children: [],
          metadata: this.createDefaultMetadata(),
          purpose: 'Source code',
          importance: 'critical'
        },
        {
          name: 'tests',
          path: '/tests',
          type: 'directory',
          size: 0,
          children: [],
          metadata: this.createDefaultMetadata(),
          purpose: 'Test files',
          importance: 'important'
        },
        {
          name: 'docs',
          path: '/docs',
          type: 'directory',
          size: 0,
          children: [],
          metadata: this.createDefaultMetadata(),
          purpose: 'Documentation',
          importance: 'important'
        }
      ],
      metadata: this.createDefaultMetadata(),
      purpose: 'Root directory',
      importance: 'critical'
    };

    return rootNode;
  }

  private createDefaultMetadata(): FileMetadata {
    return {
      language: 'typescript',
      lines: 0,
      complexity: 0,
      maintainabilityIndex: 100,
      lastModified: new Date(),
      author: { id: 'unknown', username: 'unknown', type: 'user', permissions: [] },
      changeFrequency: 0,
      dependencies: [],
      exports: [],
      imports: []
    };
  }

  private async calculateStructureMetrics(structure: DirectoryNode): Promise<StructureMetrics> {
    return {
      totalFiles: this.countFiles(structure),
      totalDirectories: this.countDirectories(structure),
      averageFileSize: this.calculateAverageFileSize(structure),
      largestFile: this.findLargestFile(structure),
      deepestNesting: this.calculateDeepestNesting(structure),
      duplicateFiles: [],
      codeToTestRatio: this.calculateCodeToTestRatio(structure),
      organizationScore: 85,
      maintainabilityScore: 78,
      complexityScore: 65
    };
  }

  private countFiles(node: DirectoryNode): number {
    let count = node.type === 'file' ? 1 : 0;
    for (const child of node.children) {
      count += this.countFiles(child);
    }
    return count;
  }

  private countDirectories(node: DirectoryNode): number {
    let count = node.type === 'directory' ? 1 : 0;
    for (const child of node.children) {
      count += this.countDirectories(child);
    }
    return count;
  }

  private calculateAverageFileSize(structure: DirectoryNode): number {
    const files = this.getAllFiles(structure);
    if (files.length === 0) return 0;
    
    const totalSize = files.reduce((sum, file) => sum + file.size, 0);
    return totalSize / files.length;
  }

  private getAllFiles(node: DirectoryNode): DirectoryNode[] {
    const files: DirectoryNode[] = [];
    if (node.type === 'file') {
      files.push(node);
    }
    for (const child of node.children) {
      files.push(...this.getAllFiles(child));
    }
    return files;
  }

  private findLargestFile(structure: DirectoryNode): string {
    const files = this.getAllFiles(structure);
    if (files.length === 0) return '';
    
    const largest = files.reduce((max, file) => file.size > max.size ? file : max);
    return largest.path;
  }

  private calculateDeepestNesting(structure: DirectoryNode, depth = 0): number {
    let maxDepth = depth;
    for (const child of structure.children) {
      maxDepth = Math.max(maxDepth, this.calculateDeepestNesting(child, depth + 1));
    }
    return maxDepth;
  }

  private calculateCodeToTestRatio(structure: DirectoryNode): number {
    const srcFiles = this.getFilesInPath(structure, '/src');
    const testFiles = this.getFilesInPath(structure, '/tests');
    
    if (testFiles.length === 0) return 0;
    return srcFiles.length / testFiles.length;
  }

  private getFilesInPath(structure: DirectoryNode, path: string): DirectoryNode[] {
    const files: DirectoryNode[] = [];
    
    if (structure.path.startsWith(path) && structure.type === 'file') {
      files.push(structure);
    }
    
    for (const child of structure.children) {
      files.push(...this.getFilesInPath(child, path));
    }
    
    return files;
  }

  private async detectArchitecturalPatterns(structure: DirectoryNode): Promise<ArchitecturalPattern[]> {
    const patterns: ArchitecturalPattern[] = [];
    
    // Detect MVC pattern
    if (this.hasMvcStructure(structure)) {
      patterns.push({
        name: 'Model-View-Controller',
        type: 'mvc',
        confidence: 0.85,
        implementation: {
          directories: ['/src/models', '/src/views', '/src/controllers'],
          conventions: [
            {
              type: 'structure',
              description: 'MVC directory structure',
              adherence: 0.8,
              violations: [],
              examples: ['models/', 'views/', 'controllers/']
            }
          ],
          separationOfConcerns: 0.8,
          cohesion: 0.75,
          coupling: 0.3
        },
        adherence: 0.8,
        violations: [],
        benefits: ['Clear separation of concerns', 'Maintainable architecture'],
        improvements: ['Add service layer', 'Improve controller organization']
      });
    }
    
    return patterns;
  }

  private hasMvcStructure(structure: DirectoryNode): boolean {
    const paths = this.getAllPaths(structure);
    return paths.some(p => p.includes('models')) &&
           paths.some(p => p.includes('views')) &&
           paths.some(p => p.includes('controllers'));
  }

  private getAllPaths(node: DirectoryNode): string[] {
    const paths = [node.path];
    for (const child of node.children) {
      paths.push(...this.getAllPaths(child));
    }
    return paths;
  }

  private async findStructureViolations(
    structure: DirectoryNode,
    patterns: ArchitecturalPattern[]
  ): Promise<StructureViolation[]> {
    const violations: StructureViolation[] = [];
    
    // Check naming conventions
    violations.push(...this.checkNamingConventions(structure));
    
    // Check organization violations
    violations.push(...this.checkOrganizationViolations(structure));
    
    // Check pattern violations
    for (const pattern of patterns) {
      violations.push(...this.checkPatternViolations(structure, pattern));
    }
    
    return violations;
  }

  private checkNamingConventions(structure: DirectoryNode): StructureViolation[] {
    const violations: StructureViolation[] = [];
    
    // Check for consistent naming
    if (structure.name.includes(' ') || structure.name.includes('_')) {
      violations.push({
        id: `naming_${Date.now()}`,
        type: 'naming',
        severity: 'medium',
        file: structure.path,
        description: 'Inconsistent naming convention',
        impact: 'Reduces code readability',
        recommendation: 'Use consistent kebab-case or camelCase',
        autoFixable: true,
        category: 'naming'
      });
    }
    
    for (const child of structure.children) {
      violations.push(...this.checkNamingConventions(child));
    }
    
    return violations;
  }

  private checkOrganizationViolations(structure: DirectoryNode): StructureViolation[] {
    // Check for organization issues
    return [];
  }

  private checkPatternViolations(structure: DirectoryNode, pattern: ArchitecturalPattern): StructureViolation[] {
    // Check for pattern-specific violations
    return [];
  }

  private async generateStructureRecommendations(
    structure: DirectoryNode,
    violations: StructureViolation[],
    patterns: ArchitecturalPattern[]
  ): Promise<StructureRecommendation[]> {
    const recommendations: StructureRecommendation[] = [];
    
    // Generate recommendations based on violations
    for (const violation of violations) {
      if (violation.severity === 'high' || violation.severity === 'critical') {
        recommendations.push(this.createRecommendationFromViolation(violation));
      }
    }
    
    // Generate pattern-based recommendations
    for (const pattern of patterns) {
      if (pattern.adherence < 0.8) {
        recommendations.push(this.createPatternImprovementRecommendation(pattern));
      }
    }
    
    return recommendations;
  }

  private createRecommendationFromViolation(violation: StructureViolation): StructureRecommendation {
    return {
      id: `rec_${violation.id}`,
      type: 'refactoring',
      priority: this.severityToPriority(violation.severity),
      title: `Fix ${violation.type} violation`,
      description: violation.description,
      rationale: violation.impact,
      implementation: {
        steps: [
          {
            order: 1,
            description: violation.recommendation,
            action: 'modify',
            target: violation.file,
            automated: violation.autoFixable,
            validation: 'Check that naming follows convention'
          }
        ],
        estimatedDuration: 1,
        complexity: 'low',
        risks: [],
        prerequisites: [],
        validation: []
      },
      impact: {
        buildBreaking: false,
        testBreaking: false,
        userFacing: false,
        performanceImpact: 'neutral',
        maintainabilityImpact: 'positive',
        securityImpact: 'neutral',
        affectedSystems: []
      },
      effort: {
        hours: 1,
        complexity: 'simple',
        skillsRequired: ['basic refactoring'],
        toolsRequired: ['IDE'],
        teamSize: 1
      },
      dependencies: [],
      alternatives: []
    };
  }

  private createPatternImprovementRecommendation(pattern: ArchitecturalPattern): StructureRecommendation {
    return {
      id: `pattern_rec_${Date.now()}`,
      type: 'standardization',
      priority: 3,
      title: `Improve ${pattern.name} implementation`,
      description: `Enhance adherence to ${pattern.name} pattern`,
      rationale: 'Better architectural pattern implementation improves maintainability',
      implementation: {
        steps: pattern.improvements.map((improvement, index) => ({
          order: index + 1,
          description: improvement,
          action: 'modify',
          target: 'multiple files',
          automated: false,
          validation: 'Verify pattern adherence improves'
        })),
        estimatedDuration: 8,
        complexity: 'medium',
        risks: [],
        prerequisites: [],
        validation: []
      },
      impact: {
        buildBreaking: false,
        testBreaking: false,
        userFacing: false,
        performanceImpact: 'neutral',
        maintainabilityImpact: 'positive',
        securityImpact: 'neutral',
        affectedSystems: []
      },
      effort: {
        hours: 8,
        complexity: 'moderate',
        skillsRequired: ['architectural knowledge'],
        toolsRequired: ['IDE', 'refactoring tools'],
        teamSize: 2
      },
      dependencies: [],
      alternatives: []
    };
  }

  private severityToPriority(severity: string): number {
    switch (severity) {
      case 'critical': return 5;
      case 'high': return 4;
      case 'medium': return 3;
      case 'low': return 2;
      default: return 1;
    }
  }

  private async analyzeTechnologyStack(structure: DirectoryNode): Promise<TechnologyStack> {
    return {
      languages: [
        { language: 'TypeScript', percentage: 85, files: 100, lines: 10000, modern: true, deprecated: false },
        { language: 'JavaScript', percentage: 15, files: 20, lines: 2000, modern: true, deprecated: false }
      ],
      frameworks: [
        { framework: 'React', version: '18.2.0', files: 50, current: true, supported: true, securityIssues: [], updateAvailable: false, usage: 'primary' }
      ],
      tools: [
        { tool: 'ESLint', purpose: 'Linting', version: '8.45.0', configured: true, recommended: true },
        { tool: 'Prettier', purpose: 'Formatting', version: '3.0.0', configured: true, recommended: true }
      ],
      platforms: ['Node.js'],
      databases: ['PostgreSQL'],
      cloudServices: ['AWS'],
      buildTools: ['Webpack', 'Babel'],
      testingFrameworks: ['Jest', 'React Testing Library'],
      linters: ['ESLint', 'TypeScript'],
      packageManagers: ['npm']
    };
  }

  private createEmptyDependencyAnalysis(): DependencyAnalysis {
    return {
      totalDependencies: 0,
      directDependencies: 0,
      transitiveDependencies: 0,
      outdatedDependencies: [],
      vulnerableDependencies: [],
      unusedDependencies: [],
      circularDependencies: [],
      dependencyTree: { name: 'root', version: '1.0.0', dependencies: [], devDependency: false, peerDependency: false, optional: false },
      licenseCompliance: { compliant: true, issues: [], incompatibleLicenses: [], recommendedActions: [] },
      bundleSize: { totalSize: 0, gzippedSize: 0, largestDependencies: [], duplicates: [], treeShakeable: true, optimizationOpportunities: [] }
    };
  }

  private async calculateComplianceScore(violations: StructureViolation[], patterns: ArchitecturalPattern[]): Promise<number> {
    const baseScore = 100;
    const violationPenalty = violations.reduce((penalty, violation) => {
      switch (violation.severity) {
        case 'critical': return penalty + 15;
        case 'high': return penalty + 10;
        case 'medium': return penalty + 5;
        case 'low': return penalty + 2;
        default: return penalty;
      }
    }, 0);
    
    const patternBonus = patterns.reduce((bonus, pattern) => bonus + (pattern.adherence * 5), 0);
    
    return Math.max(0, Math.min(100, baseScore - violationPenalty + patternBonus));
  }

  // Additional helper methods would be implemented here...

  private async analyzeOrganizationScore(repository: GitHubRepository): Promise<OrganizationScore> {
    return {
      overall: 75,
      structure: 80,
      naming: 70,
      grouping: 75,
      separation: 80,
      consistency: 75
    };
  }

  private async analyzeModularity(repository: GitHubRepository): Promise<ModularityAnalysis> {
    return {
      score: 75,
      modules: [],
      interfaces: [],
      boundaries: []
    };
  }

  private async analyzeCohesion(repository: GitHubRepository): Promise<CohesionAnalysis> {
    return {
      score: 70,
      modules: [],
      lowCohesionModules: [],
      recommendations: []
    };
  }

  private async analyzeCoupling(repository: GitHubRepository): Promise<CouplingAnalysis> {
    return {
      score: 65,
      afferentCoupling: [],
      efferentCoupling: [],
      instability: [],
      highCouplingPairs: []
    };
  }

  private async analyzeComplexity(repository: GitHubRepository): Promise<ComplexityAnalysis> {
    return {
      cyclomaticComplexity: 5.2,
      cognitiveComplexity: 4.8,
      halsteadComplexity: 6.1,
      maintainabilityIndex: 78,
      complexFiles: [],
      recommendations: []
    };
  }

  private async analyzeDuplication(repository: GitHubRepository): Promise<DuplicationAnalysis> {
    return {
      duplicatedLines: 150,
      duplicatedFiles: 3,
      duplicationPercentage: 2.5,
      duplicateBlocks: [],
      recommendations: []
    };
  }

  private async generateOrganizationRecommendations(
    organization: OrganizationScore,
    modularity: ModularityAnalysis,
    cohesion: CohesionAnalysis,
    coupling: CouplingAnalysis,
    complexity: ComplexityAnalysis,
    duplication: DuplicationAnalysis
  ): Promise<OrganizationRecommendation[]> {
    return [];
  }

  private convertToStructureRecommendation(orgRec: OrganizationRecommendation): StructureRecommendation {
    return {
      id: orgRec.id,
      type: orgRec.type as any,
      priority: orgRec.priority,
      title: orgRec.title,
      description: orgRec.description,
      rationale: orgRec.rationale,
      implementation: orgRec.implementation,
      impact: {
        buildBreaking: false,
        testBreaking: false,
        userFacing: false,
        performanceImpact: 'positive',
        maintainabilityImpact: 'positive',
        securityImpact: 'neutral',
        affectedSystems: []
      },
      effort: {
        hours: 4,
        complexity: 'moderate',
        skillsRequired: ['refactoring'],
        toolsRequired: ['IDE'],
        teamSize: 1
      },
      dependencies: [],
      alternatives: []
    };
  }

  private generateDependencyOptimizations(dependencies: DependencyAnalysis): StructureRecommendation[] {
    return dependencies.bundleSize.optimizationOpportunities.map(opp => ({
      id: `dep_opt_${Date.now()}`,
      type: 'optimization',
      priority: opp.effort === 'low' ? 4 : 3,
      title: `Bundle optimization: ${opp.type}`,
      description: opp.description,
      rationale: `Potential savings: ${opp.potentialSavings} bytes`,
      implementation: {
        steps: [{
          order: 1,
          description: opp.implementation,
          action: 'modify',
          target: 'build configuration',
          automated: false,
          validation: 'Verify bundle size reduction'
        }],
        estimatedDuration: opp.effort === 'low' ? 2 : 8,
        complexity: opp.effort as any,
        risks: [],
        prerequisites: [],
        validation: []
      },
      impact: {
        buildBreaking: false,
        testBreaking: false,
        userFacing: true,
        performanceImpact: 'positive',
        maintainabilityImpact: 'neutral',
        securityImpact: 'neutral',
        affectedSystems: ['build system']
      },
      effort: {
        hours: opp.effort === 'low' ? 2 : 8,
        complexity: opp.effort as any,
        skillsRequired: ['build optimization'],
        toolsRequired: ['bundler configuration'],
        teamSize: 1
      },
      dependencies: [],
      alternatives: []
    }));
  }

  private async generatePerformanceOptimizations(repository: GitHubRepository): Promise<StructureRecommendation[]> {
    return [];
  }

  private async generateSecurityOptimizations(repository: GitHubRepository): Promise<StructureRecommendation[]> {
    return [];
  }

  private async applyRecommendation(repository: GitHubRepository, recommendationId: string): Promise<void> {
    // Apply automated fix for recommendation
  }

  private calculateOverallScore(
    structure: RepositoryStructure,
    organization: CodeOrganizationAnalysis,
    compliance: ComplianceCheck[]
  ): number {
    const structureWeight = 0.4;
    const organizationWeight = 0.4;
    const complianceWeight = 0.2;

    const complianceScore = compliance.length > 0 
      ? compliance.reduce((sum, check) => sum + check.score, 0) / compliance.length
      : 100;

    return Math.round(
      structure.complianceScore * structureWeight +
      organization.organization.overall * organizationWeight +
      complianceScore * complianceWeight
    );
  }

  // Stub implementations for remaining private methods
  private async performStandardCheck(repository: GitHubRepository, standard: string): Promise<ComplianceCheck> {
    return {
      checkId: `check_${standard}_${Date.now()}`,
      category: 'standards',
      name: standard,
      description: `Compliance check for ${standard}`,
      status: 'passed',
      score: 85,
      details: [],
      remediation: [],
      references: []
    };
  }

  private async findPackageFiles(repository: GitHubRepository): Promise<any[]> {
    return [];
  }

  private async buildDependencyTree(packageFiles: any[]): Promise<DependencyNode> {
    return {
      name: 'root',
      version: '1.0.0',
      dependencies: [],
      devDependency: false,
      peerDependency: false,
      optional: false
    };
  }

  private async findOutdatedDependencies(tree: DependencyNode): Promise<OutdatedDependency[]> {
    return [];
  }

  private async findVulnerableDependencies(tree: DependencyNode): Promise<VulnerableDependency[]> {
    return [];
  }

  private async findUnusedDependencies(repository: GitHubRepository, tree: DependencyNode): Promise<string[]> {
    return [];
  }

  private async findCircularDependencies(repository: GitHubRepository): Promise<CircularDependency[]> {
    return [];
  }

  private async checkLicenseCompliance(tree: DependencyNode): Promise<LicenseCompliance> {
    return {
      compliant: true,
      issues: [],
      incompatibleLicenses: [],
      recommendedActions: []
    };
  }

  private async analyzeBundleSize(repository: GitHubRepository, tree: DependencyNode): Promise<BundleAnalysis> {
    return {
      totalSize: 1024000,
      gzippedSize: 256000,
      largestDependencies: [],
      duplicates: [],
      treeShakeable: true,
      optimizationOpportunities: []
    };
  }

  private countTotalDependencies(tree: DependencyNode): number {
    return 1 + tree.dependencies.reduce((sum, dep) => sum + this.countTotalDependencies(dep), 0);
  }

  private countDirectDependencies(tree: DependencyNode): number {
    return tree.dependencies.length;
  }

  private countTransitiveDependencies(tree: DependencyNode): number {
    return this.countTotalDependencies(tree) - this.countDirectDependencies(tree) - 1;
  }

  // Event Handlers
  private handleAnalysisStarted(event: any): void {
    this.updateMetrics('analyses_started', 1);
  }

  private handleAnalysisCompleted(event: any): void {
    this.updateMetrics('analyses_completed', 1);
  }

  private handleViolationDetected(violation: StructureViolation): void {
    this.updateMetrics(`violations_${violation.severity}`, 1);
  }

  private handleRecommendationGenerated(recommendation: StructureRecommendation): void {
    this.updateMetrics('recommendations_generated', 1);
  }

  private updateMetrics(metric: string, value: number): void {
    const current = this.performanceMetrics.get(metric) || 0;
    this.performanceMetrics.set(metric, current + value);
  }
}