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

// Types and Interfaces
export interface SynchronizationJob {
  id: string;
  name: string;
  description: string;
  repositories: GitHubRepository[];
  strategy: 'immediate' | 'batched' | 'scheduled' | 'triggered';
  syncType: 'version' | 'dependency' | 'configuration' | 'content' | 'branch' | 'tag';
  status: 'pending' | 'running' | 'completed' | 'failed' | 'cancelled' | 'paused';
  createdAt: Date;
  startedAt?: Date;
  completedAt?: Date;
  createdBy: GitHubUser;
  configuration: SyncConfiguration;
  progress: SyncProgress;
  results: SyncResult[];
  errors: SyncError[];
  dependencies: JobDependency[];
  schedule?: ScheduleConfig;
}

export interface SyncConfiguration {
  sourceOfTruth: 'primary_repo' | 'latest_version' | 'manual_selection' | 'consensus';
  conflictResolution: 'manual' | 'auto_merge' | 'source_wins' | 'target_wins' | 'skip';
  excludePatterns: string[];
  includePatterns: string[];
  dryRun: boolean;
  createPullRequests: boolean;
  autoMerge: boolean;
  notifyOnConflicts: boolean;
  retryPolicy: RetryPolicy;
  validation: ValidationConfig;
  rollback: RollbackConfig;
}

export interface RetryPolicy {
  maxRetries: number;
  backoffStrategy: 'linear' | 'exponential' | 'fixed';
  baseDelay: number;
  maxDelay: number;
  retryOnErrors: string[];
}

export interface ValidationConfig {
  preSync: ValidationRule[];
  postSync: ValidationRule[];
  continuous: ValidationRule[];
  failOnValidationError: boolean;
}

export interface ValidationRule {
  id: string;
  name: string;
  description: string;
  type: 'build' | 'test' | 'lint' | 'security' | 'custom';
  command?: string;
  timeout: number;
  critical: boolean;
}

export interface RollbackConfig {
  enabled: boolean;
  automaticTriggers: string[];
  manualApprovalRequired: boolean;
  preserveHistory: boolean;
  notificationChannels: string[];
}

export interface SyncProgress {
  totalRepositories: number;
  processedRepositories: number;
  completedRepositories: number;
  failedRepositories: number;
  currentRepository?: string;
  currentOperation?: string;
  estimatedTimeRemaining?: number;
  percentComplete: number;
}

export interface SyncResult {
  repository: GitHubRepository;
  status: 'success' | 'failed' | 'skipped' | 'conflict';
  changes: SyncChange[];
  conflicts: SyncConflict[];
  pullRequestId?: string;
  commitId?: string;
  duration: number;
  logs: string[];
  metrics: SyncMetrics;
}

export interface SyncChange {
  type: 'create' | 'update' | 'delete' | 'move' | 'rename';
  path: string;
  content?: string;
  previousContent?: string;
  reason: string;
  automated: boolean;
  reviewed: boolean;
}

export interface SyncConflict {
  type: 'version' | 'content' | 'merge' | 'dependency' | 'configuration';
  path: string;
  description: string;
  localValue: any;
  remoteValue: any;
  suggestedResolution: any;
  priority: 'low' | 'medium' | 'high' | 'critical';
  autoResolvable: boolean;
  resolution?: ConflictResolution;
}

export interface ConflictResolution {
  strategy: 'accept_local' | 'accept_remote' | 'merge' | 'manual' | 'skip';
  resolvedValue: any;
  resolvedBy: GitHubUser;
  resolvedAt: Date;
  reasoning: string;
}

export interface SyncMetrics {
  filesProcessed: number;
  linesChanged: number;
  dependenciesUpdated: number;
  conflictsResolved: number;
  testsRun: number;
  buildTime: number;
  validationTime: number;
}

export interface JobDependency {
  dependentJobId: string;
  dependsOnJobId: string;
  type: 'hard' | 'soft' | 'conditional';
  condition?: string;
}

export interface ScheduleConfig {
  type: 'cron' | 'interval' | 'trigger';
  expression: string;
  timezone: string;
  enabled: boolean;
  nextRun?: Date;
  lastRun?: Date;
}

export interface SyncError {
  id: string;
  type: 'network' | 'permission' | 'conflict' | 'validation' | 'build' | 'unknown';
  severity: 'low' | 'medium' | 'high' | 'critical';
  message: string;
  repository?: string;
  path?: string;
  timestamp: Date;
  resolved: boolean;
  resolution?: string;
  stackTrace?: string;
}

export interface VersionAlignment {
  alignmentId: string;
  packages: PackageVersion[];
  strategy: 'latest' | 'stable' | 'lts' | 'custom' | 'semver_range';
  targetVersion?: string;
  constraints: VersionConstraint[];
  conflicts: VersionConflict[];
  recommendations: VersionRecommendation[];
  timeline: AlignmentTimeline;
  impactAnalysis: AlignmentImpact;
}

export interface PackageVersion {
  name: string;
  repository: GitHubRepository;
  currentVersion: string;
  targetVersion: string;
  dependencies: DependencyRef[];
  devDependencies: DependencyRef[];
  peerDependencies: DependencyRef[];
  breaking: boolean;
  security: boolean;
  updateType: 'major' | 'minor' | 'patch' | 'prerelease';
}

export interface DependencyRef {
  name: string;
  version: string;
  range: string;
  optional: boolean;
  dev: boolean;
  peer: boolean;
}

export interface VersionConstraint {
  package: string;
  constraint: string;
  reason: string;
  source: 'policy' | 'security' | 'compatibility' | 'manual';
  flexible: boolean;
}

export interface VersionConflict {
  package: string;
  repositories: string[];
  versions: { repo: string; version: string }[];
  type: 'incompatible' | 'outdated' | 'security' | 'breaking';
  resolution?: VersionResolution;
}

export interface VersionResolution {
  targetVersion: string;
  strategy: 'upgrade_all' | 'downgrade_all' | 'mixed' | 'manual';
  breakingChanges: string[];
  migrationRequired: boolean;
  testingRequired: boolean;
}

export interface VersionRecommendation {
  package: string;
  currentVersion: string;
  recommendedVersion: string;
  reason: string;
  priority: 'low' | 'medium' | 'high' | 'critical';
  effort: 'trivial' | 'low' | 'medium' | 'high';
  risks: string[];
  benefits: string[];
}

export interface AlignmentTimeline {
  phases: AlignmentPhase[];
  dependencies: PhaseDependency[];
  criticalPath: string[];
  estimatedDuration: number;
}

export interface AlignmentPhase {
  id: string;
  name: string;
  description: string;
  repositories: string[];
  packages: string[];
  order: number;
  estimatedHours: number;
  parallelizable: boolean;
  prerequisites: string[];
}

export interface PhaseDependency {
  predecessor: string;
  successor: string;
  type: 'finish_to_start' | 'start_to_start' | 'finish_to_finish';
  lag: number;
}

export interface AlignmentImpact {
  riskLevel: 'low' | 'medium' | 'high' | 'critical';
  breakingChanges: number;
  affectedRepositories: number;
  testingRequired: boolean;
  downtime: number;
  rollbackComplexity: 'simple' | 'moderate' | 'complex';
  communicationPlan: CommunicationPlan;
}

export interface CommunicationPlan {
  stakeholders: Stakeholder[];
  notifications: NotificationRule[];
  escalationPath: string[];
  updateFrequency: string;
}

export interface Stakeholder {
  name: string;
  role: string;
  contact: string;
  notificationLevel: 'critical' | 'important' | 'informational';
}

export interface NotificationRule {
  trigger: string;
  channels: string[];
  template: string;
  recipients: string[];
  urgency: 'low' | 'medium' | 'high' | 'critical';
}

export interface CrossRepoDependency {
  dependencyId: string;
  sourceRepository: GitHubRepository;
  targetRepository: GitHubRepository;
  dependencyType: 'package' | 'service' | 'api' | 'data' | 'build' | 'deployment';
  relationship: 'depends_on' | 'provides' | 'consumes' | 'extends' | 'implements';
  version: string;
  versionRange: string;
  critical: boolean;
  status: 'active' | 'deprecated' | 'breaking' | 'migrating';
  impact: DependencyImpact;
  metadata: Record<string, any>;
}

export interface DependencyImpact {
  breakingChange: boolean;
  performance: 'positive' | 'neutral' | 'negative';
  security: 'improved' | 'neutral' | 'degraded';
  maintenance: 'easier' | 'neutral' | 'harder';
  testing: 'simpler' | 'neutral' | 'complex';
  deployment: 'independent' | 'coordinated' | 'synchronized';
}

export interface MonorepoCoordination {
  coordinationId: string;
  monorepo: GitHubRepository;
  packages: MonorepoPackage[];
  workspace: WorkspaceConfig;
  buildOrder: BuildOrderConfig;
  releaseStrategy: ReleaseStrategy;
  dependencyGraph: DependencyGraph;
  changesets: ChangesetConfig;
  testing: TestingStrategy;
  deployment: DeploymentCoordination;
}

export interface MonorepoPackage {
  name: string;
  path: string;
  version: string;
  private: boolean;
  dependencies: string[];
  devDependencies: string[];
  scripts: Record<string, string>;
  buildOutputs: string[];
  publishable: boolean;
  changesSinceLastRelease: boolean;
}

export interface WorkspaceConfig {
  tool: 'lerna' | 'nx' | 'rush' | 'yarn_workspaces' | 'npm_workspaces' | 'pnpm_workspaces';
  configuration: Record<string, any>;
  packageGlobs: string[];
  excludePatterns: string[];
  hoisting: 'full' | 'partial' | 'none';
  linkWorkspaceDependencies: boolean;
}

export interface BuildOrderConfig {
  strategy: 'topological' | 'parallel' | 'incremental' | 'affected_only';
  parallelism: number;
  caching: boolean;
  distributedBuilds: boolean;
  buildGraph: BuildNode[];
}

export interface BuildNode {
  package: string;
  dependencies: string[];
  buildTime: number;
  cacheable: boolean;
  outputs: string[];
}

export interface ReleaseStrategy {
  type: 'independent' | 'fixed' | 'synchronized' | 'grouped';
  versioningScheme: 'semver' | 'calendar' | 'sequential';
  changelogGeneration: boolean;
  gitTagging: boolean;
  npmPublishing: boolean;
  releaseNotes: boolean;
  prereleaseStrategy: string;
}

export interface DependencyGraph {
  nodes: DependencyNode[];
  edges: DependencyEdge[];
  cycles: string[][];
  levels: string[][];
  criticalPath: string[];
}

export interface DependencyNode {
  package: string;
  type: 'internal' | 'external';
  version: string;
  level: number;
  critical: boolean;
}

export interface DependencyEdge {
  from: string;
  to: string;
  type: 'runtime' | 'development' | 'peer' | 'optional';
  weight: number;
}

export interface ChangesetConfig {
  enabled: boolean;
  tool: 'changesets' | 'conventional_commits' | 'manual';
  autoGeneration: boolean;
  releaseProcess: 'automatic' | 'manual' | 'hybrid';
  versionBumping: 'automatic' | 'manual';
}

export interface TestingStrategy {
  levels: TestLevel[];
  parallelization: boolean;
  affectedOnly: boolean;
  caching: boolean;
  coverage: CoverageConfig;
  integration: IntegrationTestConfig;
}

export interface TestLevel {
  name: string;
  scope: 'package' | 'workspace' | 'integration' | 'e2e';
  command: string;
  timeout: number;
  retries: number;
  parallel: boolean;
}

export interface CoverageConfig {
  enabled: boolean;
  threshold: number;
  enforce: boolean;
  format: string[];
  aggregation: 'package' | 'workspace';
}

export interface IntegrationTestConfig {
  enabled: boolean;
  environment: 'local' | 'staging' | 'production_like';
  services: string[];
  fixtures: string[];
  cleanup: boolean;
}

export interface DeploymentCoordination {
  strategy: 'all_at_once' | 'rolling' | 'blue_green' | 'canary';
  environments: DeploymentEnvironment[];
  dependencies: DeploymentDependency[];
  rollback: RollbackStrategy;
  monitoring: MonitoringConfig;
}

export interface DeploymentEnvironment {
  name: string;
  packages: string[];
  configuration: Record<string, any>;
  healthChecks: HealthCheck[];
  promotionCriteria: PromotionCriteria[];
}

export interface HealthCheck {
  name: string;
  type: 'http' | 'tcp' | 'command' | 'custom';
  configuration: Record<string, any>;
  timeout: number;
  retries: number;
  interval: number;
}

export interface PromotionCriteria {
  type: 'automatic' | 'manual' | 'time_based' | 'metric_based';
  configuration: Record<string, any>;
  required: boolean;
}

export interface DeploymentDependency {
  package: string;
  dependsOn: string[];
  type: 'hard' | 'soft';
  timeout: number;
}

export interface RollbackStrategy {
  automatic: boolean;
  triggers: string[];
  timeWindow: number;
  preserveData: boolean;
  notificationRequired: boolean;
}

export interface MonitoringConfig {
  enabled: boolean;
  metrics: string[];
  alerts: AlertConfig[];
  dashboards: string[];
}

export interface AlertConfig {
  name: string;
  condition: string;
  severity: 'info' | 'warning' | 'error' | 'critical';
  channels: string[];
  escalation: EscalationConfig;
}

export interface EscalationConfig {
  levels: EscalationLevel[];
  timeouts: number[];
  notificationRules: NotificationRule[];
}

export interface EscalationLevel {
  name: string;
  contacts: string[];
  methods: string[];
}

export interface SyncCoordinatorConfig {
  maxConcurrentJobs: number;
  defaultRetryPolicy: RetryPolicy;
  conflictResolutionStrategy: 'interactive' | 'automatic' | 'manual';
  validationTimeout: number;
  enabledSyncTypes: string[];
  notificationChannels: string[];
  auditLogging: boolean;
  performanceMonitoring: boolean;
  securityScanning: boolean;
  backupBeforeSync: boolean;
}

/**
 * Enterprise-grade Synchronization Coordinator
 * 
 * Provides comprehensive cross-repository synchronization capabilities including:
 * - Multi-package version alignment and dependency management
 * - Cross-repository content and configuration synchronization
 * - Monorepo coordination with workspace management
 * - Automated conflict resolution and validation
 * - Enterprise-grade scheduling and monitoring
 */
export class SyncCoordinator extends EventEmitter {
  private config: SyncCoordinatorConfig;
  private syncJobs: Map<string, SynchronizationJob> = new Map();
  private versionAlignments: Map<string, VersionAlignment> = new Map();
  private crossRepoDependencies: Map<string, CrossRepoDependency> = new Map();
  private monorepoCoordinations: Map<string, MonorepoCoordination> = new Map();
  private activeJobs: Set<string> = new Set();
  private scheduler: Map<string, NodeJS.Timeout> = new Map();
  private performanceMetrics: Map<string, any> = new Map();

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

  private setupEventHandlers(): void {
    this.on('sync-job-created', this.handleSyncJobCreated.bind(this));
    this.on('sync-job-started', this.handleSyncJobStarted.bind(this));
    this.on('sync-job-completed', this.handleSyncJobCompleted.bind(this));
    this.on('conflict-detected', this.handleConflictDetected.bind(this));
    this.on('validation-failed', this.handleValidationFailed.bind(this));
  }

  private initializeScheduler(): void {
    // Initialize job scheduler
    setInterval(() => {
      this.processScheduledJobs();
    }, 60000); // Check every minute
  }

  // Multi-Package Synchronization
  async createSyncJob(jobConfig: Partial<SynchronizationJob>): Promise<SynchronizationJob> {
    const job: SynchronizationJob = {
      id: `sync_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
      name: jobConfig.name || 'Unnamed Sync Job',
      description: jobConfig.description || '',
      repositories: jobConfig.repositories || [],
      strategy: jobConfig.strategy || 'immediate',
      syncType: jobConfig.syncType || 'version',
      status: 'pending',
      createdAt: new Date(),
      createdBy: jobConfig.createdBy!,
      configuration: jobConfig.configuration || this.createDefaultSyncConfig(),
      progress: {
        totalRepositories: jobConfig.repositories?.length || 0,
        processedRepositories: 0,
        completedRepositories: 0,
        failedRepositories: 0,
        percentComplete: 0
      },
      results: [],
      errors: [],
      dependencies: jobConfig.dependencies || [],
      schedule: jobConfig.schedule
    };

    this.syncJobs.set(job.id, job);
    this.emit('sync-job-created', job);

    // Execute immediately or schedule
    if (job.strategy === 'immediate') {
      await this.executeSyncJob(job.id);
    } else if (job.schedule) {
      this.scheduleJob(job);
    }

    return job;
  }

  async executeSyncJob(jobId: string): Promise<boolean> {
    const job = this.syncJobs.get(jobId);
    if (!job) {
      throw new Error(`Sync job ${jobId} not found`);
    }

    if (this.activeJobs.size >= this.config.maxConcurrentJobs) {
      job.status = 'pending';
      return false;
    }

    this.activeJobs.add(jobId);
    job.status = 'running';
    job.startedAt = new Date();

    this.emit('sync-job-started', job);

    try {
      // Pre-sync validation
      await this.performPreSyncValidation(job);

      // Execute synchronization
      for (const repository of job.repositories) {
        await this.syncRepository(job, repository);
        job.progress.processedRepositories++;
        job.progress.percentComplete = (job.progress.processedRepositories / job.progress.totalRepositories) * 100;
      }

      // Post-sync validation
      await this.performPostSyncValidation(job);

      job.status = 'completed';
      job.completedAt = new Date();

      this.emit('sync-job-completed', job);
      return true;

    } catch (error) {
      job.status = 'failed';
      job.errors.push({
        id: `error_${Date.now()}`,
        type: 'unknown',
        severity: 'critical',
        message: error instanceof Error ? error.message : 'Unknown error',
        timestamp: new Date(),
        resolved: false
      });

      this.emit('sync-job-failed', { job, error });
      return false;

    } finally {
      this.activeJobs.delete(jobId);
    }
  }

  // Version Alignment
  async createVersionAlignment(
    packages: string[],
    repositories: GitHubRepository[],
    strategy: 'latest' | 'stable' | 'lts' | 'custom'
  ): Promise<VersionAlignment> {
    const alignmentId = `alignment_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;

    // Analyze current package versions
    const packageVersions = await this.analyzePackageVersions(packages, repositories);

    // Detect conflicts
    const conflicts = await this.detectVersionConflicts(packageVersions);

    // Generate recommendations
    const recommendations = await this.generateVersionRecommendations(packageVersions, strategy);

    // Build timeline
    const timeline = await this.buildAlignmentTimeline(packageVersions, recommendations);

    // Assess impact
    const impactAnalysis = await this.assessAlignmentImpact(packageVersions, recommendations);

    const alignment: VersionAlignment = {
      alignmentId,
      packages: packageVersions,
      strategy,
      constraints: [],
      conflicts,
      recommendations,
      timeline,
      impactAnalysis
    };

    this.versionAlignments.set(alignmentId, alignment);
    this.emit('version-alignment-created', alignment);

    return alignment;
  }

  async executeVersionAlignment(alignmentId: string): Promise<boolean> {
    const alignment = this.versionAlignments.get(alignmentId);
    if (!alignment) {
      throw new Error(`Version alignment ${alignmentId} not found`);
    }

    this.emit('version-alignment-started', alignment);

    try {
      // Execute alignment phases
      for (const phase of alignment.timeline.phases) {
        await this.executeAlignmentPhase(alignment, phase);
      }

      this.emit('version-alignment-completed', alignment);
      return true;

    } catch (error) {
      this.emit('version-alignment-failed', { alignment, error });
      return false;
    }
  }

  // Cross-Repository Dependency Management
  async registerCrossRepoDependency(dependency: Omit<CrossRepoDependency, 'dependencyId'>): Promise<CrossRepoDependency> {
    const crossRepoDep: CrossRepoDependency = {
      ...dependency,
      dependencyId: `dep_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`
    };

    this.crossRepoDependencies.set(crossRepoDep.dependencyId, crossRepoDep);
    this.emit('cross-repo-dependency-registered', crossRepoDep);

    return crossRepoDep;
  }

  async analyzeDependencyImpact(dependencyId: string, proposedChange: any): Promise<DependencyImpact> {
    const dependency = this.crossRepoDependencies.get(dependencyId);
    if (!dependency) {
      throw new Error(`Cross-repo dependency ${dependencyId} not found`);
    }

    // Analyze impact of proposed change
    const impact: DependencyImpact = {
      breakingChange: this.isBreakingChange(dependency, proposedChange),
      performance: this.assessPerformanceImpact(dependency, proposedChange),
      security: this.assessSecurityImpact(dependency, proposedChange),
      maintenance: this.assessMaintenanceImpact(dependency, proposedChange),
      testing: this.assessTestingImpact(dependency, proposedChange),
      deployment: this.assessDeploymentImpact(dependency, proposedChange)
    };

    this.emit('dependency-impact-analyzed', { dependency, proposedChange, impact });
    return impact;
  }

  // Monorepo Coordination
  async createMonorepoCoordination(monorepo: GitHubRepository): Promise<MonorepoCoordination> {
    const coordinationId = `monorepo_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;

    // Discover packages
    const packages = await this.discoverMonorepoPackages(monorepo);

    // Analyze workspace configuration
    const workspace = await this.analyzeWorkspaceConfig(monorepo);

    // Build dependency graph
    const dependencyGraph = await this.buildMonorepoDependencyGraph(packages);

    // Determine build order
    const buildOrder = await this.calculateBuildOrder(dependencyGraph);

    // Analyze release strategy
    const releaseStrategy = await this.analyzeReleaseStrategy(monorepo, packages);

    // Configure changesets
    const changesets = await this.configureChangesets(monorepo);

    // Setup testing strategy
    const testing = await this.setupTestingStrategy(packages);

    // Configure deployment coordination
    const deployment = await this.configureDeploymentCoordination(packages);

    const coordination: MonorepoCoordination = {
      coordinationId,
      monorepo,
      packages,
      workspace,
      buildOrder,
      releaseStrategy,
      dependencyGraph,
      changesets,
      testing,
      deployment
    };

    this.monorepoCoordinations.set(coordinationId, coordination);
    this.emit('monorepo-coordination-created', coordination);

    return coordination;
  }

  async executeMonorepoOperation(
    coordinationId: string,
    operation: 'build' | 'test' | 'release' | 'deploy',
    options: Record<string, any> = {}
  ): Promise<boolean> {
    const coordination = this.monorepoCoordinations.get(coordinationId);
    if (!coordination) {
      throw new Error(`Monorepo coordination ${coordinationId} not found`);
    }

    this.emit('monorepo-operation-started', { coordination, operation, options });

    try {
      switch (operation) {
        case 'build':
          return await this.executeMonorepoBuild(coordination, options);
        case 'test':
          return await this.executeMonorepoTest(coordination, options);
        case 'release':
          return await this.executeMonorepoRelease(coordination, options);
        case 'deploy':
          return await this.executeMonorepoDeploy(coordination, options);
        default:
          throw new Error(`Unknown monorepo operation: ${operation}`);
      }
    } catch (error) {
      this.emit('monorepo-operation-failed', { coordination, operation, error });
      return false;
    }
  }

  // Analytics and Reporting
  async generateSyncAnalytics(timeRange: { start: Date; end: Date }): Promise<any> {
    const jobsInRange = Array.from(this.syncJobs.values())
      .filter(job => job.createdAt >= timeRange.start && job.createdAt <= timeRange.end);

    const analytics = {
      totalJobs: jobsInRange.length,
      successfulJobs: jobsInRange.filter(j => j.status === 'completed').length,
      failedJobs: jobsInRange.filter(j => j.status === 'failed').length,
      averageExecutionTime: this.calculateAverageExecutionTime(jobsInRange),
      conflictRate: this.calculateConflictRate(jobsInRange),
      repositoriesSynced: this.countUniqueRepositories(jobsInRange),
      syncTypeDistribution: this.groupJobsBySyncType(jobsInRange),
      errorCategories: this.categorizeErrors(jobsInRange),
      performance: {
        averageRepoProcessingTime: this.calculateAverageRepoProcessingTime(jobsInRange),
        throughput: this.calculateThroughput(jobsInRange),
        reliability: this.calculateReliability(jobsInRange)
      }
    };

    this.emit('sync-analytics-generated', analytics);
    return analytics;
  }

  // Private Implementation Methods

  private createDefaultSyncConfig(): SyncConfiguration {
    return {
      sourceOfTruth: 'latest_version',
      conflictResolution: 'manual',
      excludePatterns: ['.git', 'node_modules', '.env'],
      includePatterns: ['**/*'],
      dryRun: false,
      createPullRequests: true,
      autoMerge: false,
      notifyOnConflicts: true,
      retryPolicy: this.config.defaultRetryPolicy,
      validation: {
        preSync: [
          {
            id: 'git_status',
            name: 'Git Status Check',
            description: 'Ensure clean working directory',
            type: 'custom',
            command: 'git status --porcelain',
            timeout: 30000,
            critical: true
          }
        ],
        postSync: [
          {
            id: 'build_test',
            name: 'Build and Test',
            description: 'Run build and test suite',
            type: 'build',
            command: 'npm run build && npm test',
            timeout: 300000,
            critical: true
          }
        ],
        continuous: [],
        failOnValidationError: true
      },
      rollback: {
        enabled: true,
        automaticTriggers: ['validation_failure', 'build_failure'],
        manualApprovalRequired: false,
        preserveHistory: true,
        notificationChannels: ['slack', 'email']
      }
    };
  }

  private scheduleJob(job: SynchronizationJob): void {
    if (!job.schedule) return;

    // Simple cron-like scheduling (in a real implementation, use a proper cron library)
    const timeout = setTimeout(() => {
      this.executeSyncJob(job.id);
    }, this.parseScheduleExpression(job.schedule.expression));

    this.scheduler.set(job.id, timeout);
  }

  private parseScheduleExpression(expression: string): number {
    // Simplified parsing - in production, use a proper cron parser
    if (expression.startsWith('every ')) {
      const parts = expression.split(' ');
      const interval = parseInt(parts[1]);
      const unit = parts[2];
      
      switch (unit) {
        case 'minutes': return interval * 60 * 1000;
        case 'hours': return interval * 60 * 60 * 1000;
        case 'days': return interval * 24 * 60 * 60 * 1000;
        default: return 60 * 60 * 1000; // 1 hour default
      }
    }
    return 60 * 60 * 1000; // 1 hour default
  }

  private async processScheduledJobs(): Promise<void> {
    // Process jobs that are ready to run
    for (const [jobId, job] of this.syncJobs) {
      if (job.status === 'pending' && job.schedule && this.shouldRunScheduledJob(job)) {
        await this.executeSyncJob(jobId);
      }
    }
  }

  private shouldRunScheduledJob(job: SynchronizationJob): boolean {
    // Simple scheduling logic
    if (!job.schedule || !job.schedule.enabled) return false;
    
    const now = new Date();
    if (job.schedule.nextRun && now >= job.schedule.nextRun) {
      return true;
    }
    
    return false;
  }

  private async performPreSyncValidation(job: SynchronizationJob): Promise<void> {
    for (const rule of job.configuration.validation.preSync) {
      await this.executeValidationRule(rule);
    }
  }

  private async performPostSyncValidation(job: SynchronizationJob): Promise<void> {
    for (const rule of job.configuration.validation.postSync) {
      await this.executeValidationRule(rule);
    }
  }

  private async executeValidationRule(rule: ValidationRule): Promise<void> {
    // Execute validation rule
    if (rule.command) {
      // Execute command and check result
      // In a real implementation, this would use child_process.exec
    }
  }

  private async syncRepository(job: SynchronizationJob, repository: GitHubRepository): Promise<void> {
    const result: SyncResult = {
      repository,
      status: 'success',
      changes: [],
      conflicts: [],
      duration: 0,
      logs: [],
      metrics: {
        filesProcessed: 0,
        linesChanged: 0,
        dependenciesUpdated: 0,
        conflictsResolved: 0,
        testsRun: 0,
        buildTime: 0,
        validationTime: 0
      }
    };

    const startTime = Date.now();

    try {
      // Perform sync operation based on type
      switch (job.syncType) {
        case 'version':
          await this.syncVersions(job, repository, result);
          break;
        case 'dependency':
          await this.syncDependencies(job, repository, result);
          break;
        case 'configuration':
          await this.syncConfiguration(job, repository, result);
          break;
        case 'content':
          await this.syncContent(job, repository, result);
          break;
        case 'branch':
          await this.syncBranches(job, repository, result);
          break;
        case 'tag':
          await this.syncTags(job, repository, result);
          break;
      }

      result.duration = Date.now() - startTime;
      job.results.push(result);
      job.progress.completedRepositories++;

    } catch (error) {
      result.status = 'failed';
      result.duration = Date.now() - startTime;
      job.results.push(result);
      job.progress.failedRepositories++;
      throw error;
    }
  }

  private async syncVersions(job: SynchronizationJob, repository: GitHubRepository, result: SyncResult): Promise<void> {
    // Sync package versions
    result.logs.push('Starting version synchronization');
    // Implementation would go here
  }

  private async syncDependencies(job: SynchronizationJob, repository: GitHubRepository, result: SyncResult): Promise<void> {
    // Sync dependencies
    result.logs.push('Starting dependency synchronization');
    // Implementation would go here
  }

  private async syncConfiguration(job: SynchronizationJob, repository: GitHubRepository, result: SyncResult): Promise<void> {
    // Sync configuration files
    result.logs.push('Starting configuration synchronization');
    // Implementation would go here
  }

  private async syncContent(job: SynchronizationJob, repository: GitHubRepository, result: SyncResult): Promise<void> {
    // Sync content
    result.logs.push('Starting content synchronization');
    // Implementation would go here
  }

  private async syncBranches(job: SynchronizationJob, repository: GitHubRepository, result: SyncResult): Promise<void> {
    // Sync branches
    result.logs.push('Starting branch synchronization');
    // Implementation would go here
  }

  private async syncTags(job: SynchronizationJob, repository: GitHubRepository, result: SyncResult): Promise<void> {
    // Sync tags
    result.logs.push('Starting tag synchronization');
    // Implementation would go here
  }

  // Version alignment methods
  private async analyzePackageVersions(packages: string[], repositories: GitHubRepository[]): Promise<PackageVersion[]> {
    // Analyze current package versions across repositories
    return [];
  }

  private async detectVersionConflicts(packageVersions: PackageVersion[]): Promise<VersionConflict[]> {
    // Detect version conflicts
    return [];
  }

  private async generateVersionRecommendations(packageVersions: PackageVersion[], strategy: string): Promise<VersionRecommendation[]> {
    // Generate version recommendations
    return [];
  }

  private async buildAlignmentTimeline(packageVersions: PackageVersion[], recommendations: VersionRecommendation[]): Promise<AlignmentTimeline> {
    // Build alignment timeline
    return {
      phases: [],
      dependencies: [],
      criticalPath: [],
      estimatedDuration: 0
    };
  }

  private async assessAlignmentImpact(packageVersions: PackageVersion[], recommendations: VersionRecommendation[]): Promise<AlignmentImpact> {
    // Assess impact
    return {
      riskLevel: 'medium',
      breakingChanges: 0,
      affectedRepositories: 0,
      testingRequired: true,
      downtime: 0,
      rollbackComplexity: 'moderate',
      communicationPlan: {
        stakeholders: [],
        notifications: [],
        escalationPath: [],
        updateFrequency: 'daily'
      }
    };
  }

  private async executeAlignmentPhase(alignment: VersionAlignment, phase: AlignmentPhase): Promise<void> {
    // Execute alignment phase
  }

  // Cross-repo dependency methods
  private isBreakingChange(dependency: CrossRepoDependency, proposedChange: any): boolean {
    // Determine if change is breaking
    return false;
  }

  private assessPerformanceImpact(dependency: CrossRepoDependency, proposedChange: any): 'positive' | 'neutral' | 'negative' {
    // Assess performance impact
    return 'neutral';
  }

  private assessSecurityImpact(dependency: CrossRepoDependency, proposedChange: any): 'improved' | 'neutral' | 'degraded' {
    // Assess security impact
    return 'neutral';
  }

  private assessMaintenanceImpact(dependency: CrossRepoDependency, proposedChange: any): 'easier' | 'neutral' | 'harder' {
    // Assess maintenance impact
    return 'neutral';
  }

  private assessTestingImpact(dependency: CrossRepoDependency, proposedChange: any): 'simpler' | 'neutral' | 'complex' {
    // Assess testing impact
    return 'neutral';
  }

  private assessDeploymentImpact(dependency: CrossRepoDependency, proposedChange: any): 'independent' | 'coordinated' | 'synchronized' {
    // Assess deployment impact
    return 'independent';
  }

  // Monorepo methods
  private async discoverMonorepoPackages(monorepo: GitHubRepository): Promise<MonorepoPackage[]> {
    // Discover packages in monorepo
    return [];
  }

  private async analyzeWorkspaceConfig(monorepo: GitHubRepository): Promise<WorkspaceConfig> {
    // Analyze workspace configuration
    return {
      tool: 'npm_workspaces',
      configuration: {},
      packageGlobs: ['packages/*'],
      excludePatterns: [],
      hoisting: 'full',
      linkWorkspaceDependencies: true
    };
  }

  private async buildMonorepoDependencyGraph(packages: MonorepoPackage[]): Promise<DependencyGraph> {
    // Build dependency graph
    return {
      nodes: [],
      edges: [],
      cycles: [],
      levels: [],
      criticalPath: []
    };
  }

  private async calculateBuildOrder(dependencyGraph: DependencyGraph): Promise<BuildOrderConfig> {
    // Calculate build order
    return {
      strategy: 'topological',
      parallelism: 4,
      caching: true,
      distributedBuilds: false,
      buildGraph: []
    };
  }

  private async analyzeReleaseStrategy(monorepo: GitHubRepository, packages: MonorepoPackage[]): Promise<ReleaseStrategy> {
    // Analyze release strategy
    return {
      type: 'independent',
      versioningScheme: 'semver',
      changelogGeneration: true,
      gitTagging: true,
      npmPublishing: true,
      releaseNotes: true,
      prereleaseStrategy: 'alpha'
    };
  }

  private async configureChangesets(monorepo: GitHubRepository): Promise<ChangesetConfig> {
    // Configure changesets
    return {
      enabled: true,
      tool: 'changesets',
      autoGeneration: false,
      releaseProcess: 'hybrid',
      versionBumping: 'automatic'
    };
  }

  private async setupTestingStrategy(packages: MonorepoPackage[]): Promise<TestingStrategy> {
    // Setup testing strategy
    return {
      levels: [],
      parallelization: true,
      affectedOnly: true,
      caching: true,
      coverage: {
        enabled: true,
        threshold: 80,
        enforce: true,
        format: ['lcov', 'html'],
        aggregation: 'workspace'
      },
      integration: {
        enabled: true,
        environment: 'local',
        services: [],
        fixtures: [],
        cleanup: true
      }
    };
  }

  private async configureDeploymentCoordination(packages: MonorepoPackage[]): Promise<DeploymentCoordination> {
    // Configure deployment coordination
    return {
      strategy: 'rolling',
      environments: [],
      dependencies: [],
      rollback: {
        automatic: true,
        triggers: ['health_check_failure'],
        timeWindow: 3600000, // 1 hour
        preserveData: true,
        notificationRequired: true
      },
      monitoring: {
        enabled: true,
        metrics: ['response_time', 'error_rate', 'throughput'],
        alerts: [],
        dashboards: []
      }
    };
  }

  private async executeMonorepoBuild(coordination: MonorepoCoordination, options: Record<string, any>): Promise<boolean> {
    // Execute monorepo build
    return true;
  }

  private async executeMonorepoTest(coordination: MonorepoCoordination, options: Record<string, any>): Promise<boolean> {
    // Execute monorepo tests
    return true;
  }

  private async executeMonorepoRelease(coordination: MonorepoCoordination, options: Record<string, any>): Promise<boolean> {
    // Execute monorepo release
    return true;
  }

  private async executeMonorepoDeploy(coordination: MonorepoCoordination, options: Record<string, any>): Promise<boolean> {
    // Execute monorepo deployment
    return true;
  }

  // Analytics methods
  private calculateAverageExecutionTime(jobs: SynchronizationJob[]): number {
    const completedJobs = jobs.filter(j => j.completedAt && j.startedAt);
    if (completedJobs.length === 0) return 0;

    const totalTime = completedJobs.reduce((sum, job) => {
      return sum + (job.completedAt!.getTime() - job.startedAt!.getTime());
    }, 0);

    return totalTime / completedJobs.length;
  }

  private calculateConflictRate(jobs: SynchronizationJob[]): number {
    const totalResults = jobs.reduce((sum, job) => sum + job.results.length, 0);
    const conflictResults = jobs.reduce((sum, job) => {
      return sum + job.results.filter(r => r.conflicts.length > 0).length;
    }, 0);

    return totalResults > 0 ? conflictResults / totalResults : 0;
  }

  private countUniqueRepositories(jobs: SynchronizationJob[]): number {
    const repositories = new Set<string>();
    jobs.forEach(job => {
      job.repositories.forEach(repo => {
        repositories.add(repo.fullName);
      });
    });
    return repositories.size;
  }

  private groupJobsBySyncType(jobs: SynchronizationJob[]): Record<string, number> {
    return jobs.reduce((groups, job) => {
      groups[job.syncType] = (groups[job.syncType] || 0) + 1;
      return groups;
    }, {} as Record<string, number>);
  }

  private categorizeErrors(jobs: SynchronizationJob[]): Record<string, number> {
    const categories: Record<string, number> = {};
    jobs.forEach(job => {
      job.errors.forEach(error => {
        categories[error.type] = (categories[error.type] || 0) + 1;
      });
    });
    return categories;
  }

  private calculateAverageRepoProcessingTime(jobs: SynchronizationJob[]): number {
    let totalTime = 0;
    let totalRepos = 0;

    jobs.forEach(job => {
      job.results.forEach(result => {
        totalTime += result.duration;
        totalRepos++;
      });
    });

    return totalRepos > 0 ? totalTime / totalRepos : 0;
  }

  private calculateThroughput(jobs: SynchronizationJob[]): number {
    // Calculate repositories processed per hour
    const totalRepos = jobs.reduce((sum, job) => sum + job.progress.completedRepositories, 0);
    const timeSpan = Date.now() - Math.min(...jobs.map(j => j.createdAt.getTime()));
    const hours = timeSpan / (60 * 60 * 1000);
    
    return hours > 0 ? totalRepos / hours : 0;
  }

  private calculateReliability(jobs: SynchronizationJob[]): number {
    const totalJobs = jobs.length;
    const successfulJobs = jobs.filter(j => j.status === 'completed').length;
    
    return totalJobs > 0 ? successfulJobs / totalJobs : 1;
  }

  // Event Handlers
  private handleSyncJobCreated(job: SynchronizationJob): void {
    this.updateMetrics('jobs_created', 1);
  }

  private handleSyncJobStarted(job: SynchronizationJob): void {
    this.updateMetrics('jobs_started', 1);
  }

  private handleSyncJobCompleted(job: SynchronizationJob): void {
    this.updateMetrics('jobs_completed', 1);
  }

  private handleConflictDetected(conflict: SyncConflict): void {
    this.updateMetrics('conflicts_detected', 1);
  }

  private handleValidationFailed(event: { job: SynchronizationJob; rule: ValidationRule; error: any }): void {
    this.updateMetrics('validation_failures', 1);
  }

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