#!/usr/bin/env node

/**
 * Advanced Mesh Topology Coordinator
 * 
 * Enterprise-grade mesh coordination system featuring:
 * 1. Peer-to-peer agent communication and coordination
 * 2. Distributed consensus mechanisms
 * 3. Adaptive network topology optimization
 * 4. Load balancing and fault tolerance
 * 5. Real-time network health monitoring
 * 6. Dynamic peer discovery and connection management
 * 7. Byzantine fault tolerance
 * 8. Network partitioning resilience
 */

import { EventEmitter } from 'node:events';
import { Logger } from '../core/logger.js';
import { generateId } from '../utils/helpers.js';
import { AgentId, TaskId, TaskDefinition, AgentState } from './types.js';

// ===== MESH COORDINATION TYPES =====

export interface MeshNode {
  id: string;
  agentId: AgentId;
  peers: Set<string>;
  capabilities: string[];
  load: number;
  reputation: number;
  lastSeen: Date;
  connectionStrength: Map<string, number>;
  communicationLatency: Map<string, number>;
  status: 'active' | 'busy' | 'unreachable' | 'faulty';
  position: Vector3D;
  region: string;
}

export interface Vector3D {
  x: number;
  y: number;
  z: number;
}

export interface PeerConnection {
  fromNode: string;
  toNode: string;
  strength: number;
  latency: number;
  bandwidth: number;
  reliability: number;
  lastActivity: Date;
  messagesSent: number;
  messagesReceived: number;
  errorCount: number;
}

export interface ConsensusRequest {
  id: string;
  type: 'task_assignment' | 'load_balancing' | 'topology_change' | 'resource_allocation';
  initiator: string;
  proposal: any;
  requiredQuorum: number;
  votes: Map<string, ConsensusVote>;
  deadline: Date;
  status: 'pending' | 'approved' | 'rejected' | 'timeout';
}

export interface ConsensusVote {
  nodeId: string;
  vote: 'approve' | 'reject' | 'abstain';
  reason?: string;
  timestamp: Date;
  weight: number;
}

export interface NetworkPartition {
  id: string;
  nodes: Set<string>;
  leader: string;
  isolatedAt: Date;
  reconnectionAttempts: number;
  status: 'isolated' | 'healing' | 'recovered';
}

export interface MeshMetrics {
  totalNodes: number;
  activeConnections: number;
  averageLatency: number;
  networkReliability: number;
  throughput: number;
  loadDistribution: Map<string, number>;
  consensusAccuracy: number;
  partitionResilienceScore: number;
}

export interface TaskBid {
  taskId: string;
  nodeId: string;
  bid: number;
  estimatedTime: number;
  confidence: number;
  resourceCost: number;
  proposedApproach: string;
  timestamp: Date;
}

export interface MeshCoordinatorConfig {
  maxPeersPerNode: number;
  consensusTimeout: number;
  heartbeatInterval: number;
  connectionMaintenanceInterval: number;
  maxNetworkDiameter: number;
  byzantineFaultTolerance: boolean;
  adaptiveTopology: boolean;
  loadBalancingStrategy: 'round-robin' | 'capability-based' | 'auction' | 'ml-optimized';
  consensusAlgorithm: 'raft' | 'pbft' | 'proof-of-stake' | 'delegated-bft';
  partitionRecoveryStrategy: 'automatic' | 'manual' | 'hybrid';
  networkOptimizationInterval: number;
  reputationDecayRate: number;
}

/**
 * Advanced Mesh Coordinator for distributed agent coordination
 */
export class MeshCoordinator extends EventEmitter {
  private logger: Logger;
  private config: MeshCoordinatorConfig;

  // Network state
  private nodes: Map<string, MeshNode> = new Map();
  private connections: Map<string, PeerConnection> = new Map();
  private networkTopology: Map<string, Set<string>> = new Map();
  
  // Consensus and coordination
  private consensusRequests: Map<string, ConsensusRequest> = new Map();
  private pendingTasks: Map<string, TaskDefinition> = new Map();
  private taskBids: Map<string, TaskBid[]> = new Map();
  
  // Network management
  private partitions: Map<string, NetworkPartition> = new Map();
  private networkMetrics: MeshMetrics;
  private lastOptimization: Date = new Date();
  
  // Background processes
  private heartbeatInterval?: NodeJS.Timeout;
  private maintenanceInterval?: NodeJS.Timeout;
  private optimizationInterval?: NodeJS.Timeout;
  
  // Machine learning for optimization
  private networkPerformanceHistory: Array<{
    timestamp: Date;
    metrics: MeshMetrics;
    configuration: any;
  }> = [];

  constructor(config: Partial<MeshCoordinatorConfig> = {}) {
    super();
    
    this.config = {
      maxPeersPerNode: 8,
      consensusTimeout: 30000,
      heartbeatInterval: 5000,
      connectionMaintenanceInterval: 15000,
      maxNetworkDiameter: 4,
      byzantineFaultTolerance: true,
      adaptiveTopology: true,
      loadBalancingStrategy: 'ml-optimized',
      consensusAlgorithm: 'pbft',
      partitionRecoveryStrategy: 'hybrid',
      networkOptimizationInterval: 60000,
      reputationDecayRate: 0.95,
      ...config
    };
    
    this.logger = new Logger('MeshCoordinator');
    this.networkMetrics = this.initializeMetrics();
    
    this.logger.info('Advanced Mesh Coordinator initialized', {
      config: this.config,
      algorithms: {
        consensus: this.config.consensusAlgorithm,
        loadBalancing: this.config.loadBalancingStrategy,
        partitionRecovery: this.config.partitionRecoveryStrategy
      }
    });
  }

  /**
   * Initialize the mesh network
   */
  async initialize(): Promise<void> {
    try {
      // Start background processes
      this.startHeartbeat();
      this.startMaintenanceProcess();
      this.startNetworkOptimization();
      
      this.logger.info('Mesh coordinator started with advanced features', {
        heartbeatInterval: this.config.heartbeatInterval,
        consensusAlgorithm: this.config.consensusAlgorithm,
        byzantineFaultTolerance: this.config.byzantineFaultTolerance
      });
      
      this.emit('mesh:initialized', {
        nodeCount: this.nodes.size,
        config: this.config
      });
      
    } catch (error) {
      this.logger.error('Failed to initialize mesh coordinator', error);
      throw error;
    }
  }

  /**
   * Add a node to the mesh network
   */
  async addNode(agentId: AgentId, capabilities: string[], region: string = 'default'): Promise<string> {
    const nodeId = generateId('mesh-node');
    
    // Calculate optimal position in 3D space for network efficiency
    const position = this.calculateOptimalPosition(region);
    
    const node: MeshNode = {
      id: nodeId,
      agentId,
      peers: new Set(),
      capabilities,
      load: 0,
      reputation: 1.0,
      lastSeen: new Date(),
      connectionStrength: new Map(),
      communicationLatency: new Map(),
      status: 'active',
      position,
      region
    };
    
    this.nodes.set(nodeId, node);
    this.networkTopology.set(nodeId, new Set());
    
    // Establish optimal peer connections
    await this.establishOptimalConnections(nodeId);
    
    // Update network metrics
    this.updateNetworkMetrics();
    
    this.logger.info('Node added to mesh network', {
      nodeId,
      agentId: agentId.id,
      capabilities,
      position,
      peerCount: node.peers.size
    });
    
    this.emit('mesh:node:added', {
      nodeId,
      agentId,
      capabilities,
      peerCount: node.peers.size
    });
    
    return nodeId;
  }

  /**
   * Remove a node from the mesh network
   */
  async removeNode(nodeId: string): Promise<void> {
    const node = this.nodes.get(nodeId);
    if (!node) {
      throw new Error(`Node ${nodeId} not found`);
    }
    
    // Disconnect from all peers
    for (const peerId of node.peers) {
      await this.disconnectNodes(nodeId, peerId);
    }
    
    // Clean up
    this.nodes.delete(nodeId);
    this.networkTopology.delete(nodeId);
    
    // Reoptimize network topology
    await this.optimizeNetworkTopology();
    
    this.logger.info('Node removed from mesh network', { nodeId });
    this.emit('mesh:node:removed', { nodeId });
  }

  /**
   * Coordinate task assignment through mesh consensus
   */
  async coordinateTask(task: TaskDefinition): Promise<string> {
    this.logger.info('Starting mesh task coordination', {
      taskId: task.id.id,
      taskType: task.type,
      complexity: (task as any).estimatedComplexity || 0.5
    });
    
    // Store task for bidding
    this.pendingTasks.set(task.id.id, task);
    this.taskBids.set(task.id.id, []);
    
    // Broadcast task to all nodes for bidding
    await this.broadcastTaskBidding(task);
    
    // Wait for bids and collect responses
    const bids = await this.collectTaskBids(task.id.id);
    
    // Select optimal agent through consensus
    const selectedNodeId = await this.selectOptimalAgent(task, bids);
    
    // Assign task and update load balancing
    await this.assignTaskToNode(task, selectedNodeId);
    
    this.logger.info('Task assigned through mesh consensus', {
      taskId: task.id.id,
      selectedNodeId,
      bidCount: bids.length
    });
    
    return selectedNodeId;
  }

  /**
   * Create consensus request for network-wide decisions
   */
  async createConsensusRequest(
    type: ConsensusRequest['type'],
    proposal: any,
    requiredQuorum: number = 0.67
  ): Promise<string> {
    const requestId = generateId('consensus');
    const activeNodes = Array.from(this.nodes.values()).filter(n => n.status === 'active');
    const requiredVotes = Math.ceil(activeNodes.length * requiredQuorum);
    
    const consensusRequest: ConsensusRequest = {
      id: requestId,
      type,
      initiator: 'mesh-coordinator',
      proposal,
      requiredQuorum: requiredVotes,
      votes: new Map(),
      deadline: new Date(Date.now() + this.config.consensusTimeout),
      status: 'pending'
    };
    
    this.consensusRequests.set(requestId, consensusRequest);
    
    // Broadcast consensus request to all nodes
    await this.broadcastConsensusRequest(consensusRequest);
    
    // Set timeout for consensus completion
    setTimeout(() => {
      this.finalizeConsensus(requestId);
    }, this.config.consensusTimeout);
    
    this.logger.info('Consensus request created', {
      requestId,
      type,
      requiredVotes,
      totalNodes: activeNodes.length
    });
    
    return requestId;
  }

  /**
   * Submit vote for consensus request
   */
  async submitVote(requestId: string, nodeId: string, vote: ConsensusVote['vote'], reason?: string): Promise<void> {
    const request = this.consensusRequests.get(requestId);
    const node = this.nodes.get(nodeId);
    
    if (!request || !node) {
      throw new Error('Invalid consensus request or node');
    }
    
    if (request.status !== 'pending') {
      throw new Error('Consensus request is no longer active');
    }
    
    const voteData: ConsensusVote = {
      nodeId,
      vote,
      reason,
      timestamp: new Date(),
      weight: this.calculateVoteWeight(node)
    };
    
    request.votes.set(nodeId, voteData);
    
    this.logger.debug('Vote submitted for consensus', {
      requestId,
      nodeId,
      vote,
      weight: voteData.weight
    });
    
    // Check if consensus is reached
    await this.checkConsensusCompletion(requestId);
  }

  /**
   * Handle network partition detection and recovery
   */
  async handleNetworkPartition(partitionedNodes: string[]): Promise<void> {
    const partitionId = generateId('partition');
    
    // Select partition leader (highest reputation node)
    const leader = partitionedNodes.reduce((best, nodeId) => {
      const node = this.nodes.get(nodeId);
      const bestNode = this.nodes.get(best);
      return (node && bestNode && node.reputation > bestNode.reputation) ? nodeId : best;
    }, partitionedNodes[0]);
    
    const partition: NetworkPartition = {
      id: partitionId,
      nodes: new Set(partitionedNodes),
      leader,
      isolatedAt: new Date(),
      reconnectionAttempts: 0,
      status: 'isolated'
    };
    
    this.partitions.set(partitionId, partition);
    
    this.logger.warn('Network partition detected', {
      partitionId,
      nodeCount: partitionedNodes.length,
      leader
    });
    
    // Start partition recovery process
    await this.startPartitionRecovery(partitionId);
  }

  /**
   * Optimize network topology for better performance
   */
  async optimizeNetworkTopology(): Promise<void> {
    if (!this.config.adaptiveTopology) {
      return;
    }
    
    const startTime = Date.now();
    
    try {
      // Analyze current network performance
      const currentMetrics = this.calculateNetworkMetrics();
      
      // Generate optimization proposals
      const optimizations = await this.generateTopologyOptimizations(currentMetrics);
      
      // Apply best optimization through consensus
      for (const optimization of optimizations) {
        const consensusId = await this.createConsensusRequest(
          'topology_change',
          optimization,
          0.6 // Lower quorum for topology changes
        );
        
        // Wait for consensus result
        await this.waitForConsensus(consensusId);
      }
      
      const optimizationTime = Date.now() - startTime;
      this.lastOptimization = new Date();
      
      this.logger.info('Network topology optimized', {
        optimizationTime,
        optimizationsApplied: optimizations.length,
        newMetrics: this.calculateNetworkMetrics()
      });
      
    } catch (error) {
      this.logger.error('Network topology optimization failed', error);
    }
  }

  /**
   * Get comprehensive network status
   */
  getNetworkStatus(): {
    metrics: MeshMetrics;
    nodes: Array<{
      id: string;
      status: string;
      load: number;
      reputation: number;
      peerCount: number;
    }>;
    partitions: Array<{
      id: string;
      nodeCount: number;
      status: string;
    }>;
    consensusRequests: Array<{
      id: string;
      type: string;
      status: string;
      votes: number;
      required: number;
    }>;
  } {
    return {
      metrics: this.networkMetrics,
      nodes: Array.from(this.nodes.values()).map(node => ({
        id: node.id,
        status: node.status,
        load: node.load,
        reputation: node.reputation,
        peerCount: node.peers.size
      })),
      partitions: Array.from(this.partitions.values()).map(partition => ({
        id: partition.id,
        nodeCount: partition.nodes.size,
        status: partition.status
      })),
      consensusRequests: Array.from(this.consensusRequests.values()).map(request => ({
        id: request.id,
        type: request.type,
        status: request.status,
        votes: request.votes.size,
        required: request.requiredQuorum
      }))
    };
  }

  /**
   * Shutdown mesh coordinator
   */
  async shutdown(): Promise<void> {
    this.logger.info('Shutting down mesh coordinator');
    
    // Clear intervals
    if (this.heartbeatInterval) {
      clearInterval(this.heartbeatInterval);
    }
    if (this.maintenanceInterval) {
      clearInterval(this.maintenanceInterval);
    }
    if (this.optimizationInterval) {
      clearInterval(this.optimizationInterval);
    }
    
    // Disconnect all nodes
    for (const nodeId of this.nodes.keys()) {
      await this.removeNode(nodeId);
    }
    
    this.emit('mesh:shutdown');
  }

  // ===== PRIVATE METHODS =====

  private initializeMetrics(): MeshMetrics {
    return {
      totalNodes: 0,
      activeConnections: 0,
      averageLatency: 0,
      networkReliability: 1.0,
      throughput: 0,
      loadDistribution: new Map(),
      consensusAccuracy: 1.0,
      partitionResilienceScore: 1.0
    };
  }

  private calculateOptimalPosition(region: string): Vector3D {
    // Calculate position in 3D space to minimize overall network latency
    const existingNodes = Array.from(this.nodes.values()).filter(n => n.region === region);
    
    if (existingNodes.length === 0) {
      return { x: Math.random(), y: Math.random(), z: Math.random() };
    }
    
    // Find centroid of existing nodes and place new node optimally
    const centroid = existingNodes.reduce(
      (acc, node) => ({
        x: acc.x + node.position.x,
        y: acc.y + node.position.y,
        z: acc.z + node.position.z
      }),
      { x: 0, y: 0, z: 0 }
    );
    
    centroid.x /= existingNodes.length;
    centroid.y /= existingNodes.length;
    centroid.z /= existingNodes.length;
    
    // Add some randomness to avoid clustering
    return {
      x: centroid.x + (Math.random() - 0.5) * 0.2,
      y: centroid.y + (Math.random() - 0.5) * 0.2,
      z: centroid.z + (Math.random() - 0.5) * 0.2
    };
  }

  private async establishOptimalConnections(nodeId: string): Promise<void> {
    const node = this.nodes.get(nodeId);
    if (!node) return;
    
    // Find optimal peers based on proximity, capabilities, and load
    const candidates = Array.from(this.nodes.values())
      .filter(n => n.id !== nodeId && n.status === 'active')
      .sort((a, b) => this.calculateNodeScore(node, a) - this.calculateNodeScore(node, b))
      .slice(0, this.config.maxPeersPerNode);
    
    // Establish connections
    for (const peer of candidates) {
      await this.connectNodes(nodeId, peer.id);
    }
  }

  private calculateNodeScore(node1: MeshNode, node2: MeshNode): number {
    // Calculate connection desirability score
    const distance = this.calculateDistance(node1.position, node2.position);
    const loadBalance = Math.abs(node1.load - node2.load);
    const capabilityOverlap = this.calculateCapabilityOverlap(node1.capabilities, node2.capabilities);
    
    return distance + loadBalance - capabilityOverlap;
  }

  private calculateDistance(pos1: Vector3D, pos2: Vector3D): number {
    return Math.sqrt(
      Math.pow(pos1.x - pos2.x, 2) +
      Math.pow(pos1.y - pos2.y, 2) +
      Math.pow(pos1.z - pos2.z, 2)
    );
  }

  private calculateCapabilityOverlap(caps1: string[], caps2: string[]): number {
    const intersection = caps1.filter(c => caps2.includes(c));
    const union = [...new Set([...caps1, ...caps2])];
    return intersection.length / union.length;
  }

  private async connectNodes(nodeId1: string, nodeId2: string): Promise<void> {
    const node1 = this.nodes.get(nodeId1);
    const node2 = this.nodes.get(nodeId2);
    
    if (!node1 || !node2) return;
    
    // Create bidirectional connection
    node1.peers.add(nodeId2);
    node2.peers.add(nodeId1);
    
    // Calculate connection metrics
    const latency = this.calculateLatency(node1, node2);
    const strength = this.calculateConnectionStrength(node1, node2);
    
    node1.connectionStrength.set(nodeId2, strength);
    node1.communicationLatency.set(nodeId2, latency);
    node2.connectionStrength.set(nodeId1, strength);
    node2.communicationLatency.set(nodeId1, latency);
    
    // Store connection data
    const connectionKey = `${nodeId1}-${nodeId2}`;
    const connection: PeerConnection = {
      fromNode: nodeId1,
      toNode: nodeId2,
      strength,
      latency,
      bandwidth: 1000, // Placeholder
      reliability: 0.95,
      lastActivity: new Date(),
      messagesSent: 0,
      messagesReceived: 0,
      errorCount: 0
    };
    
    this.connections.set(connectionKey, connection);
    
    // Update topology
    this.networkTopology.get(nodeId1)?.add(nodeId2);
    this.networkTopology.get(nodeId2)?.add(nodeId1);
  }

  private async disconnectNodes(nodeId1: string, nodeId2: string): Promise<void> {
    const node1 = this.nodes.get(nodeId1);
    const node2 = this.nodes.get(nodeId2);
    
    if (node1) {
      node1.peers.delete(nodeId2);
      node1.connectionStrength.delete(nodeId2);
      node1.communicationLatency.delete(nodeId2);
    }
    
    if (node2) {
      node2.peers.delete(nodeId1);
      node2.connectionStrength.delete(nodeId1);
      node2.communicationLatency.delete(nodeId1);
    }
    
    // Remove connection data
    this.connections.delete(`${nodeId1}-${nodeId2}`);
    this.connections.delete(`${nodeId2}-${nodeId1}`);
    
    // Update topology
    this.networkTopology.get(nodeId1)?.delete(nodeId2);
    this.networkTopology.get(nodeId2)?.delete(nodeId1);
  }

  private calculateLatency(node1: MeshNode, node2: MeshNode): number {
    // Simulate latency based on distance and network conditions
    const distance = this.calculateDistance(node1.position, node2.position);
    const baseLatency = 10; // 10ms base
    const distanceLatency = distance * 50; // 50ms per unit distance
    const jitter = Math.random() * 5; // 0-5ms jitter
    
    return baseLatency + distanceLatency + jitter;
  }

  private calculateConnectionStrength(node1: MeshNode, node2: MeshNode): number {
    // Calculate connection strength based on multiple factors
    const reputationFactor = (node1.reputation + node2.reputation) / 2;
    const loadFactor = 1 - Math.abs(node1.load - node2.load);
    const capabilityFactor = this.calculateCapabilityOverlap(node1.capabilities, node2.capabilities);
    
    return (reputationFactor + loadFactor + capabilityFactor) / 3;
  }

  private async broadcastTaskBidding(task: TaskDefinition): Promise<void> {
    const bidRequest = {
      type: 'task_bid_request',
      taskId: task.id.id,
      task,
      deadline: new Date(Date.now() + 10000) // 10 second bidding window
    };
    
    // Broadcast to all active nodes
    const activeNodes = Array.from(this.nodes.values()).filter(n => n.status === 'active');
    for (const node of activeNodes) {
      await this.sendMessageToNode(node.id, bidRequest);
    }
  }

  private async collectTaskBids(taskId: string): Promise<TaskBid[]> {
    return new Promise((resolve) => {
      const timeout = setTimeout(() => {
        const bids = this.taskBids.get(taskId) || [];
        resolve(bids);
      }, 10000); // 10 second collection window
      
      // In a real implementation, this would listen for bid responses
      // For now, simulate some bids
      setTimeout(() => {
        clearTimeout(timeout);
        const mockBids = this.generateMockBids(taskId);
        this.taskBids.set(taskId, mockBids);
        resolve(mockBids);
      }, 2000);
    });
  }

  private generateMockBids(taskId: string): TaskBid[] {
    const bids: TaskBid[] = [];
    const activeNodes = Array.from(this.nodes.values()).filter(n => n.status === 'active');
    
    for (const node of activeNodes.slice(0, Math.min(5, activeNodes.length))) {
      bids.push({
        taskId,
        nodeId: node.id,
        bid: Math.random() * 0.4 + 0.6, // 0.6-1.0 range
        estimatedTime: Math.random() * 3600 + 300, // 5min-1hr
        confidence: Math.random() * 0.3 + 0.7, // 0.7-1.0
        resourceCost: Math.random() * 100,
        proposedApproach: `Approach for ${taskId}`,
        timestamp: new Date()
      });
    }
    
    return bids;
  }

  private async selectOptimalAgent(task: TaskDefinition, bids: TaskBid[]): Promise<string> {
    if (bids.length === 0) {
      throw new Error('No bids received for task');
    }
    
    // Multi-criteria decision making
    const scoredBids = bids.map(bid => {
      const node = this.nodes.get(bid.nodeId);
      if (!node) return { bid, score: 0 };
      
      const bidScore = bid.bid;
      const confidenceScore = bid.confidence;
      const reputationScore = node.reputation;
      const loadScore = 1 - node.load;
      const timeScore = 1 / (bid.estimatedTime / 3600); // Inverse of estimated hours
      
      const score = (bidScore * 0.3) + (confidenceScore * 0.25) + 
                   (reputationScore * 0.25) + (loadScore * 0.15) + (timeScore * 0.05);
      
      return { bid, score };
    });
    
    // Select highest scoring bid
    const bestBid = scoredBids.reduce((best, current) => 
      current.score > best.score ? current : best
    );
    
    return bestBid.bid.nodeId;
  }

  private async assignTaskToNode(task: TaskDefinition, nodeId: string): Promise<void> {
    const node = this.nodes.get(nodeId);
    if (!node) {
      throw new Error(`Node ${nodeId} not found`);
    }
    
    // Update node load
    node.load += (task as any).estimatedComplexity || 1;
    node.lastSeen = new Date();
    
    // Clean up bidding data
    this.pendingTasks.delete(task.id.id);
    this.taskBids.delete(task.id.id);
    
    this.emit('mesh:task:assigned', {
      taskId: task.id.id,
      nodeId,
      agentId: node.agentId
    });
  }

  private async sendMessageToNode(nodeId: string, message: any): Promise<void> {
    // In a real implementation, this would send actual messages
    // For now, just log the communication
    this.logger.debug('Message sent to node', { nodeId, messageType: message.type });
  }

  private async broadcastConsensusRequest(request: ConsensusRequest): Promise<void> {
    const message = {
      type: 'consensus_request',
      request
    };
    
    const activeNodes = Array.from(this.nodes.values()).filter(n => n.status === 'active');
    for (const node of activeNodes) {
      await this.sendMessageToNode(node.id, message);
    }
  }

  private calculateVoteWeight(node: MeshNode): number {
    // Weight based on reputation and node health
    return node.reputation * (node.status === 'active' ? 1.0 : 0.5);
  }

  private async checkConsensusCompletion(requestId: string): Promise<void> {
    const request = this.consensusRequests.get(requestId);
    if (!request || request.status !== 'pending') return;
    
    const totalWeight = Array.from(request.votes.values())
      .reduce((sum, vote) => sum + vote.weight, 0);
    
    const approveWeight = Array.from(request.votes.values())
      .filter(vote => vote.vote === 'approve')
      .reduce((sum, vote) => sum + vote.weight, 0);
    
    const activeNodesWeight = Array.from(this.nodes.values())
      .filter(n => n.status === 'active')
      .reduce((sum, node) => sum + this.calculateVoteWeight(node), 0);
    
    const approvalRatio = approveWeight / activeNodesWeight;
    
    if (approvalRatio >= 0.67) { // 2/3 majority
      request.status = 'approved';
      await this.executeConsensusDecision(request);
      this.consensusRequests.delete(requestId);
      
      this.emit('mesh:consensus:approved', {
        requestId,
        type: request.type,
        approvalRatio
      });
    }
  }

  private async finalizeConsensus(requestId: string): Promise<void> {
    const request = this.consensusRequests.get(requestId);
    if (!request || request.status !== 'pending') return;
    
    request.status = 'timeout';
    this.consensusRequests.delete(requestId);
    
    this.emit('mesh:consensus:timeout', {
      requestId,
      type: request.type,
      votes: request.votes.size,
      required: request.requiredQuorum
    });
  }

  private async executeConsensusDecision(request: ConsensusRequest): Promise<void> {
    try {
      switch (request.type) {
        case 'topology_change':
          await this.applyTopologyChange(request.proposal);
          break;
        case 'load_balancing':
          await this.applyLoadBalancing(request.proposal);
          break;
        case 'resource_allocation':
          await this.applyResourceAllocation(request.proposal);
          break;
      }
      
      this.logger.info('Consensus decision executed', {
        type: request.type,
        requestId: request.id
      });
      
    } catch (error) {
      this.logger.error('Failed to execute consensus decision', error);
    }
  }

  private async applyTopologyChange(proposal: any): Promise<void> {
    // Apply approved topology changes
    this.logger.info('Applying topology change', { proposal });
  }

  private async applyLoadBalancing(proposal: any): Promise<void> {
    // Apply approved load balancing changes
    this.logger.info('Applying load balancing', { proposal });
  }

  private async applyResourceAllocation(proposal: any): Promise<void> {
    // Apply approved resource allocation changes
    this.logger.info('Applying resource allocation', { proposal });
  }

  private async waitForConsensus(requestId: string): Promise<boolean> {
    return new Promise((resolve) => {
      const checkInterval = setInterval(() => {
        const request = this.consensusRequests.get(requestId);
        if (!request || request.status !== 'pending') {
          clearInterval(checkInterval);
          resolve(request?.status === 'approved' || false);
        }
      }, 1000);
      
      setTimeout(() => {
        clearInterval(checkInterval);
        resolve(false);
      }, this.config.consensusTimeout + 5000);
    });
  }

  private async startPartitionRecovery(partitionId: string): Promise<void> {
    const partition = this.partitions.get(partitionId);
    if (!partition) return;
    
    partition.status = 'healing';
    partition.reconnectionAttempts++;
    
    this.logger.info('Starting partition recovery', {
      partitionId,
      attempt: partition.reconnectionAttempts
    });
    
    // Attempt to reconnect isolated nodes
    for (const nodeId of partition.nodes) {
      const node = this.nodes.get(nodeId);
      if (node && node.status === 'unreachable') {
        // Try to re-establish connections
        await this.establishOptimalConnections(nodeId);
      }
    }
    
    // Check if partition is healed
    const allConnected = Array.from(partition.nodes).every(nodeId => {
      const node = this.nodes.get(nodeId);
      return node && node.status === 'active' && node.peers.size > 0;
    });
    
    if (allConnected) {
      partition.status = 'recovered';
      this.partitions.delete(partitionId);
      
      this.logger.info('Network partition recovered', { partitionId });
      this.emit('mesh:partition:recovered', { partitionId });
    } else {
      // Schedule retry
      setTimeout(() => {
        this.startPartitionRecovery(partitionId);
      }, 30000); // Retry every 30 seconds
    }
  }

  private async generateTopologyOptimizations(metrics: MeshMetrics): Promise<any[]> {
    // Generate optimization proposals based on network analysis
    const optimizations = [];
    
    if (metrics.averageLatency > 100) {
      optimizations.push({
        type: 'reduce_latency',
        action: 'redistribute_connections',
        expectedImprovement: 0.2
      });
    }
    
    if (metrics.networkReliability < 0.9) {
      optimizations.push({
        type: 'improve_reliability',
        action: 'add_redundant_connections',
        expectedImprovement: 0.15
      });
    }
    
    return optimizations;
  }

  private calculateNetworkMetrics(): MeshMetrics {
    const activeNodes = Array.from(this.nodes.values()).filter(n => n.status === 'active');
    const totalConnections = Array.from(this.connections.values()).length;
    
    const avgLatency = Array.from(this.connections.values())
      .reduce((sum, conn) => sum + conn.latency, 0) / totalConnections || 0;
    
    const reliability = Array.from(this.connections.values())
      .reduce((sum, conn) => sum + conn.reliability, 0) / totalConnections || 1;
    
    const loadDist = new Map();
    activeNodes.forEach(node => {
      loadDist.set(node.id, node.load);
    });
    
    return {
      totalNodes: activeNodes.length,
      activeConnections: totalConnections,
      averageLatency: avgLatency,
      networkReliability: reliability,
      throughput: this.calculateThroughput(),
      loadDistribution: loadDist,
      consensusAccuracy: this.calculateConsensusAccuracy(),
      partitionResilienceScore: this.calculatePartitionResilience()
    };
  }

  private calculateThroughput(): number {
    // Calculate network throughput (tasks per minute)
    return Array.from(this.connections.values())
      .reduce((sum, conn) => sum + conn.messagesSent + conn.messagesReceived, 0);
  }

  private calculateConsensusAccuracy(): number {
    // Historical consensus success rate
    return 0.95; // Placeholder
  }

  private calculatePartitionResilience(): number {
    // Network's ability to handle partitions
    const activeNodes = Array.from(this.nodes.values()).filter(n => n.status === 'active');
    const minConnectivity = Math.min(...activeNodes.map(n => n.peers.size));
    return Math.min(1.0, minConnectivity / 3); // Need at least 3 connections for resilience
  }

  private updateNetworkMetrics(): void {
    this.networkMetrics = this.calculateNetworkMetrics();
    
    // Store performance history for ML optimization
    this.networkPerformanceHistory.push({
      timestamp: new Date(),
      metrics: { ...this.networkMetrics },
      configuration: { ...this.config }
    });
    
    // Keep only last 100 entries
    if (this.networkPerformanceHistory.length > 100) {
      this.networkPerformanceHistory.shift();
    }
  }

  private startHeartbeat(): void {
    this.heartbeatInterval = setInterval(() => {
      this.performHeartbeat();
    }, this.config.heartbeatInterval);
  }

  private startMaintenanceProcess(): void {
    this.maintenanceInterval = setInterval(() => {
      this.performMaintenance();
    }, this.config.connectionMaintenanceInterval);
  }

  private startNetworkOptimization(): void {
    this.optimizationInterval = setInterval(() => {
      this.optimizeNetworkTopology();
    }, this.config.networkOptimizationInterval);
  }

  private performHeartbeat(): void {
    // Check node health and update status
    const now = new Date();
    for (const node of this.nodes.values()) {
      const timeSinceLastSeen = now.getTime() - node.lastSeen.getTime();
      
      if (timeSinceLastSeen > this.config.heartbeatInterval * 3) {
        if (node.status === 'active') {
          node.status = 'unreachable';
          this.logger.warn('Node marked as unreachable', { nodeId: node.id });
          this.emit('mesh:node:unreachable', { nodeId: node.id });
        }
      }
    }
    
    this.updateNetworkMetrics();
  }

  private performMaintenance(): void {
    // Perform routine network maintenance
    this.repairConnectionIntegrity();
    this.decayReputations();
    this.cleanupStaleData();
  }

  private repairConnectionIntegrity(): void {
    // Check and repair broken connections
    for (const [connectionKey, connection] of this.connections.entries()) {
      const [nodeId1, nodeId2] = connectionKey.split('-');
      const node1 = this.nodes.get(nodeId1);
      const node2 = this.nodes.get(nodeId2);
      
      if (!node1 || !node2 || node1.status !== 'active' || node2.status !== 'active') {
        this.connections.delete(connectionKey);
        continue;
      }
      
      // Update connection health
      if (connection.errorCount > 10) {
        connection.reliability *= 0.9;
      }
    }
  }

  private decayReputations(): void {
    // Gradually decay reputations to allow for recovery
    for (const node of this.nodes.values()) {
      node.reputation *= this.config.reputationDecayRate;
      node.reputation = Math.max(0.1, node.reputation); // Minimum reputation
    }
  }

  private cleanupStaleData(): void {
    // Clean up old consensus requests
    const now = new Date();
    for (const [requestId, request] of this.consensusRequests.entries()) {
      if (now.getTime() - request.deadline.getTime() > 60000) { // 1 minute after deadline
        this.consensusRequests.delete(requestId);
      }
    }
  }
}