@clduab11/gemini-flow/src/core/github-a2a-pr-system.ts

Revolutionary AI agent swarm coordination platform with Google Services integration, multimedia processing, and production-ready monitoring. Features 8 Google AI services, quantum computing capabilities, and enterprise-grade security.

/**
 * GitHub A2A Pull Request System - Automated PR reviews with multiple specialized agents
 * Coordinates A2A agents for comprehensive code review, testing, and approval workflows
 */

import {
  GitHubA2ABridge,
  A2AAgent,
  GitHubOperation,
} from "./github-a2a-bridge.js";
import { A2AIntegration } from "./a2a-integration.js";
import { EventEmitter } from "events";

export interface PRReviewRequest {
  repository: string;
  pr_number: number;
  head_sha: string;
  base_sha: string;
  files_changed: GitHubFile[];
  author: string;
  title: string;
  description: string;
  labels: string[];
  reviewers: string[];
  assignees: string[];
}

export interface GitHubFile {
  filename: string;
  status: "added" | "modified" | "removed" | "renamed";
  additions: number;
  deletions: number;
  changes: number;
  patch?: string;
  previous_filename?: string;
}

export interface ReviewResult {
  agent_id: string;
  agent_type: string;
  review_type:
    | "code_quality"
    | "security"
    | "performance"
    | "testing"
    | "architecture";
  status: "approved" | "changes_requested" | "comment";
  confidence: number;
  findings: ReviewFinding[];
  suggestions: ReviewSuggestion[];
  overall_score: number;
  execution_time: number;
}

export interface ReviewFinding {
  type: "error" | "warning" | "info" | "suggestion";
  severity: "critical" | "high" | "medium" | "low";
  file: string;
  line?: number;
  column?: number;
  message: string;
  rule_id?: string;
  suggestion?: string;
}

export interface ReviewSuggestion {
  type: "refactor" | "optimize" | "security" | "style" | "documentation";
  file: string;
  line_start?: number;
  line_end?: number;
  current_code?: string;
  suggested_code?: string;
  rationale: string;
  impact: "low" | "medium" | "high";
}

export interface PRAnalysis {
  complexity_score: number;
  risk_assessment: "low" | "medium" | "high" | "critical";
  test_coverage_impact: number;
  breaking_changes: boolean;
  security_implications: boolean;
  performance_impact: "positive" | "negative" | "neutral";
  architectural_changes: boolean;
  documentation_required: boolean;
}

export class GitHubA2APRSystem extends EventEmitter {
  private bridge: GitHubA2ABridge;
  private a2aIntegration: A2AIntegration;
  private activeReviews: Map<string, PRReviewSession> = new Map();
  private reviewStrategies: Map<string, ReviewStrategy> = new Map();

  constructor(bridge: GitHubA2ABridge) {
    super();
    this.bridge = bridge;
    this.a2aIntegration = new A2AIntegration();
    this.initializeReviewStrategies();
    this.setupEventHandlers();
  }

  /**
   * Initialize different review strategies for various PR types
   */
  private initializeReviewStrategies(): void {
    this.reviewStrategies.set("security-focused", {
      name: "Security-Focused Review",
      agents: ["security", "reviewer", "analyst"],
      parallel: true,
      required_approvals: 2,
      focus_areas: [
        "security",
        "vulnerability",
        "authentication",
        "authorization",
      ],
    });

    this.reviewStrategies.set("architecture-review", {
      name: "Architecture Review",
      agents: ["architect", "reviewer", "security"],
      parallel: false,
      required_approvals: 2,
      focus_areas: [
        "design-patterns",
        "scalability",
        "maintainability",
        "performance",
      ],
    });

    this.reviewStrategies.set("feature-review", {
      name: "Feature Review",
      agents: ["reviewer", "tester", "analyst"],
      parallel: true,
      required_approvals: 2,
      focus_areas: [
        "functionality",
        "testing",
        "documentation",
        "code-quality",
      ],
    });

    this.reviewStrategies.set("hotfix-review", {
      name: "Hotfix Review",
      agents: ["security", "reviewer"],
      parallel: true,
      required_approvals: 1,
      focus_areas: ["security", "regression-risk", "impact-analysis"],
    });
  }

  /**
   * Process incoming pull request for A2A agent review
   */
  async processPullRequest(request: PRReviewRequest): Promise<string> {
    const sessionId = `pr-${request.repository}-${request.pr_number}-${Date.now()}`;

    try {
      // Analyze PR to determine review strategy
      const analysis = await this.analyzePullRequest(request);

      // Select appropriate review strategy
      const strategy = this.selectReviewStrategy(request, analysis);

      // Create review session
      const session = new PRReviewSession(
        sessionId,
        request,
        strategy,
        analysis,
      );
      this.activeReviews.set(sessionId, session);

      // Assign A2A agents to review
      const assignedAgents = await this.assignReviewAgents(strategy);

      // Start coordinated review process
      await this.startCoordinatedReview(session, assignedAgents);

      this.emit("pr-review-started", {
        sessionId,
        request,
        strategy,
        assignedAgents,
      });

      return sessionId;
    } catch (error) {
      console.error(
        `Failed to process PR review for ${request.repository}#${request.pr_number}:`,
        error,
      );
      throw error;
    }
  }

  /**
   * Analyze pull request to understand its characteristics
   */
  private async analyzePullRequest(
    request: PRReviewRequest,
  ): Promise<PRAnalysis> {
    const analysis: PRAnalysis = {
      complexity_score: this.calculateComplexityScore(request),
      risk_assessment: this.assessRisk(request),
      test_coverage_impact: this.calculateTestCoverageImpact(request),
      breaking_changes: this.detectBreakingChanges(request),
      security_implications: this.detectSecurityImplications(request),
      performance_impact: this.assessPerformanceImpact(request),
      architectural_changes: this.detectArchitecturalChanges(request),
      documentation_required: this.isDocumentationRequired(request),
    };

    return analysis;
  }

  /**
   * Select appropriate review strategy based on PR characteristics
   */
  private selectReviewStrategy(
    request: PRReviewRequest,
    analysis: PRAnalysis,
  ): ReviewStrategy {
    // Security-critical changes
    if (
      analysis.security_implications ||
      analysis.risk_assessment === "critical"
    ) {
      return this.reviewStrategies.get("security-focused")!;
    }

    // Architectural changes
    if (analysis.architectural_changes || analysis.complexity_score > 80) {
      return this.reviewStrategies.get("architecture-review")!;
    }

    // Hotfix or urgent changes
    if (
      request.labels.includes("hotfix") ||
      request.labels.includes("urgent")
    ) {
      return this.reviewStrategies.get("hotfix-review")!;
    }

    // Default feature review
    return this.reviewStrategies.get("feature-review")!;
  }

  /**
   * Assign A2A agents for review based on strategy
   */
  private async assignReviewAgents(
    strategy: ReviewStrategy,
  ): Promise<A2AAgent[]> {
    const availableAgents = await this.getAvailableAgents();
    const assignedAgents: A2AAgent[] = [];

    for (const agentType of strategy.agents) {
      const agent = availableAgents.find(
        (a) => a.type === agentType && a.status === "idle",
      );

      if (agent) {
        agent.status = "working";
        assignedAgents.push(agent);
      }
    }

    return assignedAgents;
  }

  /**
   * Start coordinated review process with assigned agents
   */
  private async startCoordinatedReview(
    session: PRReviewSession,
    agents: A2AAgent[],
  ): Promise<void> {
    const reviewTasks = await this.createReviewTasks(session, agents);

    if (session.strategy.parallel) {
      // Execute reviews in parallel
      const reviewPromises = reviewTasks.map((task) =>
        this.executeReviewTask(task),
      );
      const results = await Promise.all(reviewPromises);
      await this.consolidateReviewResults(session.id, results);
    } else {
      // Execute reviews sequentially
      const results: ReviewResult[] = [];
      for (const task of reviewTasks) {
        const result = await this.executeReviewTask(task);
        results.push(result);
      }
      await this.consolidateReviewResults(session.id, results);
    }
  }

  /**
   * Create review tasks for assigned agents
   */
  private async createReviewTasks(
    session: PRReviewSession,
    agents: A2AAgent[],
  ): Promise<ReviewTask[]> {
    const tasks: ReviewTask[] = [];

    for (const agent of agents) {
      const task: ReviewTask = {
        id: `review-${session.id}-${agent.id}`,
        session_id: session.id,
        agent_id: agent.id,
        agent_type: agent.type,
        review_type: this.mapAgentTypeToReviewType(agent.type),
        focus_areas: session.strategy.focus_areas,
        files_to_review: this.filterFilesForAgent(
          session.request.files_changed,
          agent.type,
        ),
        priority: this.calculateTaskPriority(session.analysis, agent.type),
        estimated_duration: this.estimateReviewDuration(
          session.request,
          agent.type,
        ),
      };

      tasks.push(task);
    }

    return tasks;
  }

  /**
   * Execute individual review task with A2A agent
   */
  private async executeReviewTask(task: ReviewTask): Promise<ReviewResult> {
    const startTime = Date.now();

    try {
      // Send review request to A2A agent
      const reviewRequest = {
        task_id: task.id,
        type: "code_review",
        data: {
          files: task.files_to_review,
          focus_areas: task.focus_areas,
          review_type: task.review_type,
        },
      };

      const agentResponse = await this.a2aIntegration.executeTask(
        task.agent_id,
        reviewRequest,
      );

      // Process agent response into review result
      const result: ReviewResult = {
        agent_id: task.agent_id,
        agent_type: task.agent_type,
        review_type: task.review_type,
        status: agentResponse.status || "comment",
        confidence: agentResponse.confidence || 0.8,
        findings: agentResponse.findings || [],
        suggestions: agentResponse.suggestions || [],
        overall_score: agentResponse.score || 75,
        execution_time: Date.now() - startTime,
      };

      this.emit("review-task-completed", { task, result });

      return result;
    } catch (error) {
      console.error(`Review task failed for agent ${task.agent_id}:`, error);

      // Return error result
      return {
        agent_id: task.agent_id,
        agent_type: task.agent_type,
        review_type: task.review_type,
        status: "changes_requested",
        confidence: 0,
        findings: [
          {
            type: "error",
            severity: "high",
            file: "system",
            message: `Review failed: ${error}`,
            rule_id: "system-error",
          },
        ],
        suggestions: [],
        overall_score: 0,
        execution_time: Date.now() - startTime,
      };
    }
  }

  /**
   * Consolidate review results from all agents
   */
  private async consolidateReviewResults(
    sessionId: string,
    results: ReviewResult[],
  ): Promise<void> {
    const session = this.activeReviews.get(sessionId);
    if (!session) return;

    session.results = results;

    // Calculate overall review status
    const overallStatus = this.calculateOverallStatus(results);
    const consolidatedFindings = this.consolidateFindings(results);
    const consolidatedSuggestions = this.consolidateSuggestions(results);

    // Create consolidated review
    const consolidatedReview = {
      session_id: sessionId,
      overall_status: overallStatus,
      agent_results: results,
      consolidated_findings: consolidatedFindings,
      consolidated_suggestions: consolidatedSuggestions,
      recommendation: this.generateRecommendation(results, session.analysis),
      confidence: this.calculateOverallConfidence(results),
      review_quality_score: this.calculateReviewQuality(results),
    };

    // Submit review to GitHub
    await this.submitGitHubReview(session.request, consolidatedReview);

    // Update session status
    session.status = "completed";
    session.completed_at = new Date();

    this.emit("pr-review-completed", { sessionId, consolidatedReview });
  }

  /**
   * Submit consolidated review to GitHub
   */
  private async submitGitHubReview(
    request: PRReviewRequest,
    review: any,
  ): Promise<void> {
    // Format review for GitHub API
    const githubReview = {
      event: review.overall_status,
      body: this.formatReviewBody(review),
      comments: this.formatReviewComments(
        review.consolidated_findings,
        review.consolidated_suggestions,
      ),
    };

    // Submit via GitHub API (would be actual API call in real implementation)
    console.log(
      `Submitting review for ${request.repository}#${request.pr_number}:`,
      githubReview,
    );

    // Emit event for external handlers
    this.emit("github-review-submitted", { request, review: githubReview });
  }

  /**
   * Format review body for GitHub
   */
  private formatReviewBody(review: any): string {
    let body = "## 🤖 A2A Agent Review Summary\n\n";

    body += `**Overall Status:** ${review.overall_status.toUpperCase()}\n`;
    body += `**Confidence:** ${(review.confidence * 100).toFixed(1)}%\n`;
    body += `**Quality Score:** ${review.review_quality_score}/100\n\n`;

    if (review.recommendation) {
      body += `**Recommendation:** ${review.recommendation}\n\n`;
    }

    // Agent breakdown
    body += "### Agent Reviews\n\n";
    for (const result of review.agent_results) {
      body += `- **${result.agent_type}**: ${result.status} (${result.overall_score}/100)\n`;
    }

    body += "\n---\n";
    body +=
      "*This review was generated by A2A (Agent-to-Agent) collaboration system*";

    return body;
  }

  /**
   * Format review comments for GitHub
   */
  private formatReviewComments(
    findings: ReviewFinding[],
    suggestions: ReviewSuggestion[],
  ): any[] {
    const comments: any[] = [];

    // Add findings as comments
    for (const finding of findings) {
      if (finding.file && finding.line) {
        comments.push({
          path: finding.file,
          position: finding.line,
          body: `**${finding.severity.toUpperCase()}**: ${finding.message}${finding.suggestion ? `\n\n**Suggestion:** ${finding.suggestion}` : ""}`,
        });
      }
    }

    // Add suggestions as comments
    for (const suggestion of suggestions) {
      if (suggestion.file && suggestion.line_start) {
        let commentBody = `**${suggestion.type.toUpperCase()}**: ${suggestion.rationale}`;

        if (suggestion.suggested_code) {
          commentBody += "\n\n**Suggested change:**\n```diff\n";
          if (suggestion.current_code) {
            commentBody += `- ${suggestion.current_code}\n`;
          }
          commentBody += `+ ${suggestion.suggested_code}\n`;
          commentBody += "```";
        }

        comments.push({
          path: suggestion.file,
          position: suggestion.line_start,
          body: commentBody,
        });
      }
    }

    return comments;
  }

  // Utility methods for PR analysis
  private calculateComplexityScore(request: PRReviewRequest): number {
    let score = 0;

    // File count factor
    score += Math.min(request.files_changed.length * 5, 30);

    // Change volume factor
    const totalChanges = request.files_changed.reduce(
      (sum, file) => sum + file.changes,
      0,
    );
    score += Math.min(totalChanges / 10, 40);

    // File type complexity
    for (const file of request.files_changed) {
      if (file.filename.includes("test")) score += 2;
      if (file.filename.endsWith(".ts") || file.filename.endsWith(".js"))
        score += 3;
      if (
        file.filename.includes("config") ||
        file.filename.includes("security")
      )
        score += 5;
    }

    return Math.min(score, 100);
  }

  private assessRisk(
    request: PRReviewRequest,
  ): "low" | "medium" | "high" | "critical" {
    const riskFactors = [
      request.files_changed.some((f) => f.filename.includes("security")),
      request.files_changed.some((f) => f.filename.includes("auth")),
      request.files_changed.some((f) => f.filename.includes("config")),
      request.files_changed.length > 20,
      request.labels.includes("breaking-change"),
    ];

    const riskScore = riskFactors.filter(Boolean).length;

    if (riskScore >= 3) return "critical";
    if (riskScore >= 2) return "high";
    if (riskScore >= 1) return "medium";
    return "low";
  }

  private calculateTestCoverageImpact(request: PRReviewRequest): number {
    const testFiles = request.files_changed.filter(
      (f) => f.filename.includes("test") || f.filename.includes("spec"),
    ).length;

    const sourceFiles = request.files_changed.filter(
      (f) => !f.filename.includes("test") && !f.filename.includes("spec"),
    ).length;

    if (sourceFiles === 0) return 100;
    return Math.min((testFiles / sourceFiles) * 100, 100);
  }

  private detectBreakingChanges(request: PRReviewRequest): boolean {
    return (
      request.labels.includes("breaking-change") ||
      request.files_changed.some((f) => f.deletions > f.additions * 2)
    );
  }

  private detectSecurityImplications(request: PRReviewRequest): boolean {
    const securityKeywords = [
      "auth",
      "security",
      "password",
      "token",
      "key",
      "crypto",
    ];
    return (
      request.files_changed.some((f) =>
        securityKeywords.some((keyword) =>
          f.filename.toLowerCase().includes(keyword),
        ),
      ) || request.labels.includes("security")
    );
  }

  private assessPerformanceImpact(
    request: PRReviewRequest,
  ): "positive" | "negative" | "neutral" {
    const performanceKeywords = [
      "performance",
      "optimize",
      "cache",
      "async",
      "parallel",
    ];
    const hasPerformanceChanges = request.files_changed.some((f) =>
      performanceKeywords.some(
        (keyword) =>
          f.filename.toLowerCase().includes(keyword) ||
          (f.patch && f.patch.toLowerCase().includes(keyword)),
      ),
    );

    if (hasPerformanceChanges) return "positive";
    if (request.files_changed.some((f) => f.changes > 500)) return "negative";
    return "neutral";
  }

  private detectArchitecturalChanges(request: PRReviewRequest): boolean {
    const archKeywords = [
      "architecture",
      "design",
      "pattern",
      "structure",
      "core",
      "framework",
    ];
    return request.files_changed.some((f) =>
      archKeywords.some((keyword) =>
        f.filename.toLowerCase().includes(keyword),
      ),
    );
  }

  private isDocumentationRequired(request: PRReviewRequest): boolean {
    return (
      request.files_changed.some((f) => f.status === "added") ||
      request.files_changed.length > 10 ||
      !request.files_changed.some((f) =>
        f.filename.toLowerCase().includes("readme"),
      )
    );
  }

  private mapAgentTypeToReviewType(
    agentType: string,
  ): ReviewResult["review_type"] {
    const mapping: Record<string, ReviewResult["review_type"]> = {
      reviewer: "code_quality",
      security: "security",
      tester: "testing",
      architect: "architecture",
      analyst: "code_quality",
    };
    return mapping[agentType] || "code_quality";
  }

  private filterFilesForAgent(
    files: GitHubFile[],
    agentType: string,
  ): GitHubFile[] {
    // Filter files based on agent specialization
    switch (agentType) {
      case "security":
        return files.filter(
          (f) =>
            f.filename.includes("auth") ||
            f.filename.includes("security") ||
            f.filename.includes("crypto"),
        );
      case "tester":
        return files.filter(
          (f) =>
            f.filename.includes("test") ||
            f.filename.includes("spec") ||
            f.filename.endsWith(".test.ts") ||
            f.filename.endsWith(".spec.ts"),
        );
      default:
        return files;
    }
  }

  private calculateTaskPriority(
    analysis: PRAnalysis,
    agentType: string,
  ): "low" | "medium" | "high" {
    if (analysis.risk_assessment === "critical" && agentType === "security")
      return "high";
    if (analysis.complexity_score > 80) return "high";
    if (analysis.breaking_changes) return "high";
    return "medium";
  }

  private estimateReviewDuration(
    request: PRReviewRequest,
    agentType: string,
  ): number {
    const baseTime = 10; // minutes
    const complexityFactor = request.files_changed.length * 2;
    const agentFactor = agentType === "security" ? 1.5 : 1.0;

    return Math.min(baseTime + complexityFactor * agentFactor, 60);
  }

  private calculateOverallStatus(results: ReviewResult[]): string {
    const approvals = results.filter((r) => r.status === "approved").length;
    const changesRequested = results.filter(
      (r) => r.status === "changes_requested",
    ).length;

    if (changesRequested > 0) return "REQUEST_CHANGES";
    if (approvals >= 2) return "APPROVE";
    return "COMMENT";
  }

  private consolidateFindings(results: ReviewResult[]): ReviewFinding[] {
    const allFindings = results.flatMap((r) => r.findings);

    // Remove duplicates and prioritize by severity
    const uniqueFindings = new Map<string, ReviewFinding>();

    for (const finding of allFindings) {
      const key = `${finding.file}:${finding.line}:${finding.message}`;
      const existing = uniqueFindings.get(key);

      if (
        !existing ||
        this.getSeverityWeight(finding.severity) >
          this.getSeverityWeight(existing.severity)
      ) {
        uniqueFindings.set(key, finding);
      }
    }

    return Array.from(uniqueFindings.values()).sort(
      (a, b) =>
        this.getSeverityWeight(b.severity) - this.getSeverityWeight(a.severity),
    );
  }

  private consolidateSuggestions(results: ReviewResult[]): ReviewSuggestion[] {
    const allSuggestions = results.flatMap((r) => r.suggestions);

    // Remove duplicates and prioritize by impact
    const uniqueSuggestions = new Map<string, ReviewSuggestion>();

    for (const suggestion of allSuggestions) {
      const key = `${suggestion.file}:${suggestion.line_start}:${suggestion.type}`;
      const existing = uniqueSuggestions.get(key);

      if (
        !existing ||
        this.getImpactWeight(suggestion.impact) >
          this.getImpactWeight(existing.impact)
      ) {
        uniqueSuggestions.set(key, suggestion);
      }
    }

    return Array.from(uniqueSuggestions.values()).sort(
      (a, b) => this.getImpactWeight(b.impact) - this.getImpactWeight(a.impact),
    );
  }

  private generateRecommendation(
    results: ReviewResult[],
    analysis: PRAnalysis,
  ): string {
    const avgScore =
      results.reduce((sum, r) => sum + r.overall_score, 0) / results.length;
    const criticalFindings = results
      .flatMap((r) => r.findings)
      .filter((f) => f.severity === "critical").length;

    if (criticalFindings > 0) {
      return "Address critical security or functionality issues before merging.";
    }

    if (avgScore > 85) {
      return "Code quality is excellent. Ready for merge after minor adjustments.";
    }

    if (avgScore > 70) {
      return "Good code quality with some areas for improvement. Consider addressing suggestions.";
    }

    return "Significant improvements needed. Please address the identified issues.";
  }

  private calculateOverallConfidence(results: ReviewResult[]): number {
    if (results.length === 0) return 0;
    return results.reduce((sum, r) => sum + r.confidence, 0) / results.length;
  }

  private calculateReviewQuality(results: ReviewResult[]): number {
    if (results.length === 0) return 0;

    const scores = results.map((r) => r.overall_score);
    const avgScore =
      scores.reduce((sum, score) => sum + score, 0) / scores.length;

    // Adjust for review thoroughness
    const thoroughnessBonus = Math.min(results.length * 5, 20);

    return Math.min(avgScore + thoroughnessBonus, 100);
  }

  private getSeverityWeight(severity: string): number {
    const weights = { critical: 4, high: 3, medium: 2, low: 1 };
    return weights[severity as keyof typeof weights] || 1;
  }

  private getImpactWeight(impact: string): number {
    const weights = { high: 3, medium: 2, low: 1 };
    return weights[impact as keyof typeof weights] || 1;
  }

  private async getAvailableAgents(): Promise<A2AAgent[]> {
    // This would integrate with the bridge to get available agents
    return [];
  }

  private setupEventHandlers(): void {
    this.on("review-timeout", (sessionId: string) => {
      const session = this.activeReviews.get(sessionId);
      if (session) {
        session.status = "timeout";
        console.warn(`Review session ${sessionId} timed out`);
      }
    });
  }

  /**
   * Get active review sessions
   */
  getActiveReviews(): Map<string, PRReviewSession> {
    return this.activeReviews;
  }

  /**
   * Cancel a review session
   */
  async cancelReview(sessionId: string): Promise<void> {
    const session = this.activeReviews.get(sessionId);
    if (session) {
      session.status = "cancelled";
      this.activeReviews.delete(sessionId);
      this.emit("pr-review-cancelled", { sessionId });
    }
  }
}

// Supporting interfaces and classes
interface ReviewStrategy {
  name: string;
  agents: string[];
  parallel: boolean;
  required_approvals: number;
  focus_areas: string[];
}

interface ReviewTask {
  id: string;
  session_id: string;
  agent_id: string;
  agent_type: string;
  review_type: ReviewResult["review_type"];
  focus_areas: string[];
  files_to_review: GitHubFile[];
  priority: "low" | "medium" | "high";
  estimated_duration: number;
}

class PRReviewSession {
  public id: string;
  public request: PRReviewRequest;
  public strategy: ReviewStrategy;
  public analysis: PRAnalysis;
  public status:
    | "pending"
    | "in_progress"
    | "completed"
    | "cancelled"
    | "timeout";
  public created_at: Date;
  public completed_at?: Date;
  public results?: ReviewResult[];

  constructor(
    id: string,
    request: PRReviewRequest,
    strategy: ReviewStrategy,
    analysis: PRAnalysis,
  ) {
    this.id = id;
    this.request = request;
    this.strategy = strategy;
    this.analysis = analysis;
    this.status = "pending";
    this.created_at = new Date();
  }
}