ArcticSwarm 2026: Arsitektur Gated Isolation, Shared Bulletin Board, dan Three-Tier Commitment Review untuk Mengatasi Premature Consensus pada Long-Horizon Multi-Agent Deep Research

// ArcticSwarm Multi-Agent Deep Research Kernel & Gated Isolation Engine
// Berdasarkan Arsitektur Snowflake AI Research (arXiv:2609.01870, September 2026)
// Memisahkan Evidence Gathering dari Evidence Integration via Gated BBS & 3-Tier Review Gates

import { EventEmitter } from 'node:events';
import { createHash } from 'node:crypto';

export type BBSChannelType = 'discoveries' | 'key-findings' | 'discussion' | 'consensus';

export interface BBSPost {
  id: string;
  channel: BBSChannelType;
  authorSubagentId: string;
  hypothesis: string;
  evidenceSnippets: Array<{
    url: string;
    passageHash: string;
    extractedFact: string;
    relevanceScore: number;
  }>;
  confidenceScore: number; // 0.0 - 1.0
  isAlternativeSweep: boolean;
  timestamp: number;
}

export interface ReviewVerdict {
  reviewerId: string;
  postId: string;
  status: 'ACCEPTED' | 'CHALLENGED' | 'REJECTED';
  challengeReason?: string;
  alternativeCandidatesRequired: boolean;
  reviewedAt: number;
}

/**
 * 1. Gated Isolation Manager: Mengisolasi sub-agen investigasi selama fase eksplorasi.
 * Mencegah sub-agen membaca temuan parsial rekanan yang memicu premature convergence.
 */
export class GatedIsolationManager {
  private isolatedSubagents: Set = new Set();
  private evidenceJaccardHistory: Map = new Map();

  public registerSubagent(subagentId: string, isolatePeerReads: boolean = true): void {
    if (isolatePeerReads) {
      this.isolatedSubagents.add(subagentId);
    }
    this.evidenceJaccardHistory.set(subagentId, new Set());
  }

  public canReadBBS(subagentId: string, channel: BBSChannelType): boolean {
    // Sub-agen terisolasi dilarang membaca channel konsensus & diskusi bebas selama fase gathering
    if (this.isolatedSubagents.has(subagentId)) {
      return channel === 'discoveries'; // Hanya membaca feed penemuan mentah tanpa interpretasi rekan
    }
    return true;
  }

  public recordVisitedPassages(subagentId: string, urls: string[]): void {
    const history = this.evidenceJaccardHistory.get(subagentId);
    if (history) {
      urls.forEach(u => history.add(u));
    }
  }

  /**
   * Menghitung pairwise Jaccard overlap untuk memvalidasi dispersi pencarian antar-agen
   */
  public calculateMeanPairwiseJaccard(): number {
    const agents = Array.from(this.evidenceJaccardHistory.keys());
    if (agents.length < 2) return 0;

    let totalJaccard = 0;
    let pairsCount = 0;

    for (let i = 0; i < agents.length; i++) {
      for (let j = i + 1; j < agents.length; j++) {
        const setA = this.evidenceJaccardHistory.get(agents[i])!;
        const setB = this.evidenceJaccardHistory.get(agents[j])!;
        const intersection = new Set([...setA].filter(x => setB.has(x)));
        const union = new Set([...setA, ...setB]);
        const jaccard = union.size === 0 ? 0 : intersection.size / union.size;
        totalJaccard += jaccard;
        pairsCount++;
      }
    }

    return pairsCount === 0 ? 0 : totalJaccard / pairsCount;
  }

  public liftIsolation(subagentId: string): void {
    this.isolatedSubagents.delete(subagentId);
  }
}

/**
 * 2. Asynchronous Bulletin Board System (BBS): Kanal topik terstruktur
 */
export class SharedResearchBulletinBoard extends EventEmitter {
  private channels: Map = new Map([
    ['discoveries', []],
    ['key-findings', []],
    ['discussion', []],
    ['consensus', []],
  ]);

  public publish(post: BBSPost): void {
    const list = this.channels.get(post.channel) || [];
    list.push(post);
    this.channels.set(post.channel, list);
    this.emit('new_post', post);
  }

  public getPosts(channel: BBSChannelType): BBSPost[] {
    return this.channels.get(channel) || [];
  }
}

/**
 * 3. Three-Tier Commitment Review Engine:
 * Tier 1: Investigator Self-Check
 * Tier 2: Dedicated Reviewer Board Audit
 * Tier 3: Enforced Commit Gate + Mandatory Alternative-Candidate Sweep
 */
export class ThreeTierCommitmentReviewer {
  private bbs: SharedResearchBulletinBoard;
  private isolationManager: GatedIsolationManager;

  constructor(bbs: SharedResearchBulletinBoard, isolation: GatedIsolationManager) {
    this.bbs = bbs;
    this.isolationManager = isolation;
  }

  // Tier 1: Investigator Self-Check
  public async executeSelfCheck(post: BBSPost): Promise {
    if (post.evidenceSnippets.length < 2) return false;
    if (post.confidenceScore < 0.75) return false;
    // Verifikasi hash integritas kutipan
    for (const snippet of post.evidenceSnippets) {
      if (!snippet.passageHash || snippet.extractedFact.trim().length === 0) {
        return false;
      }
    }
    return true;
  }

  // Tier 2: Dedicated Reviewer Board Audit
  public async executeBoardAudit(
    reviewerId: string, 
    post: BBSPost
  ): Promise {
    // Mengecek apakah terdapat bukti yang saling berkontradiksi di kanal discoveries
    const discoveries = this.bbs.getPosts('discoveries');
    const contradictions = discoveries.filter(d => 
      d.id !== post.id && 
      d.authorSubagentId !== post.authorSubagentId &&
      d.hypothesis !== post.hypothesis &&
      d.confidenceScore > 0.8
    );

    if (contradictions.length > 0) {
      return {
        reviewerId,
        postId: post.id,
        status: 'CHALLENGED',
        challengeReason: `Terdapat ${contradictions.length} bukti tandingan independen yang belum diverifikasi.`,
        alternativeCandidatesRequired: true,
        reviewedAt: Date.now(),
      };
    }

    return {
      reviewerId,
      postId: post.id,
      status: 'ACCEPTED',
      alternativeCandidatesRequired: false,
      reviewedAt: Date.now(),
    };
  }

  // Tier 3: Enforced Commit Gate
  public async evaluateCommitGate(
    leadingPost: BBSPost,
    auditVerdict: ReviewVerdict,
    hasAlternativeCandidateSweep: boolean
  ): Promise<{ canCommit: boolean; committedAnswer?: string; reason: string }> {
    if (auditVerdict.status !== 'ACCEPTED') {
      return {
        canCommit: false,
        reason: 'Board Audit belum memberikan vonis ACCEPTED terhadap kandidat utama.',
      };
    }

    // Syarat wajib arXiv:2609.01870: sapuan kandidat alternatif harus selesai sebelum soft deadline
    if (!hasAlternativeCandidateSweep) {
      return {
        canCommit: false,
        reason: 'Commit diblokir: Alternative-candidate sweep wajib dieksekusi untuk membuktikan hipotesis tandingan salah.',
      };
    }

    // Rekomendasikan post ke kanal consensus
    this.bbs.publish({
      ...leadingPost,
      channel: 'consensus',
      confidenceScore: 0.98,
      timestamp: Date.now(),
    });

    return {
      canCommit: true,
      committedAnswer: leadingPost.hypothesis,
      reason: 'Semua 3 gate terpenuhi secara deterministik: Self-Check lolos, Board Audit tervalidasi, dan Alternative Sweep nihil sanggahan.',
    };
  }
}