import * as plugins from '../../plugins.js';
import type {
  IConnectionRecord,
  ISmartProxyOptions
} from './models/interfaces.js';
import {
  isRoutedOptions
} from './models/interfaces.js';
import type {
  IRouteConfig,
  IRouteAction
} from './models/route-types.js';
import { ConnectionManager } from './connection-manager.js';
import { SecurityManager } from './security-manager.js';
import { TlsManager } from './tls-manager.js';
import { NetworkProxyBridge } from './network-proxy-bridge.js';
import { TimeoutManager } from './timeout-manager.js';
import { RouteManager } from './route-manager.js';
import type { ForwardingHandler } from '../../forwarding/handlers/base-handler.js';

/**
 * Handles new connection processing and setup logic with support for route-based configuration
 */
export class RouteConnectionHandler {
  private settings: ISmartProxyOptions;

  constructor(
    settings: ISmartProxyOptions,
    private connectionManager: ConnectionManager,
    private securityManager: SecurityManager,
    private tlsManager: TlsManager,
    private networkProxyBridge: NetworkProxyBridge,
    private timeoutManager: TimeoutManager,
    private routeManager: RouteManager
  ) {
    this.settings = settings;
  }

  /**
   * Handle a new incoming connection
   */
  public handleConnection(socket: plugins.net.Socket): void {
    const remoteIP = socket.remoteAddress || '';
    const localPort = socket.localPort || 0;

    // Validate IP against rate limits and connection limits
    const ipValidation = this.securityManager.validateIP(remoteIP);
    if (!ipValidation.allowed) {
      console.log(`Connection rejected from ${remoteIP}: ${ipValidation.reason}`);
      socket.end();
      socket.destroy();
      return;
    }

    // Create a new connection record
    const record = this.connectionManager.createConnection(socket);
    const connectionId = record.id;

    // Apply socket optimizations
    socket.setNoDelay(this.settings.noDelay);

    // Apply keep-alive settings if enabled
    if (this.settings.keepAlive) {
      socket.setKeepAlive(true, this.settings.keepAliveInitialDelay);
      record.hasKeepAlive = true;

      // Apply enhanced TCP keep-alive options if enabled
      if (this.settings.enableKeepAliveProbes) {
        try {
          // These are platform-specific and may not be available
          if ('setKeepAliveProbes' in socket) {
            (socket as any).setKeepAliveProbes(10);
          }
          if ('setKeepAliveInterval' in socket) {
            (socket as any).setKeepAliveInterval(1000);
          }
        } catch (err) {
          // Ignore errors - these are optional enhancements
          if (this.settings.enableDetailedLogging) {
            console.log(`[${connectionId}] Enhanced TCP keep-alive settings not supported: ${err}`);
          }
        }
      }
    }

    if (this.settings.enableDetailedLogging) {
      console.log(
        `[${connectionId}] New connection from ${remoteIP} on port ${localPort}. ` +
          `Keep-Alive: ${record.hasKeepAlive ? 'Enabled' : 'Disabled'}. ` +
          `Active connections: ${this.connectionManager.getConnectionCount()}`
      );
    } else {
      console.log(
        `New connection from ${remoteIP} on port ${localPort}. Active connections: ${this.connectionManager.getConnectionCount()}`
      );
    }

    // Start TLS SNI handling
    this.handleTlsConnection(socket, record);
  }

  /**
   * Handle a connection and wait for TLS handshake for SNI extraction if needed
   */
  private handleTlsConnection(socket: plugins.net.Socket, record: IConnectionRecord): void {
    const connectionId = record.id;
    const localPort = record.localPort;
    let initialDataReceived = false;

    // Set an initial timeout for handshake data
    let initialTimeout: NodeJS.Timeout | null = setTimeout(() => {
      if (!initialDataReceived) {
        console.log(
          `[${connectionId}] Initial data warning (${this.settings.initialDataTimeout}ms) for connection from ${record.remoteIP}`
        );

        // Add a grace period
        setTimeout(() => {
          if (!initialDataReceived) {
            console.log(`[${connectionId}] Final initial data timeout after grace period`);
            if (record.incomingTerminationReason === null) {
              record.incomingTerminationReason = 'initial_timeout';
              this.connectionManager.incrementTerminationStat('incoming', 'initial_timeout');
            }
            socket.end();
            this.connectionManager.cleanupConnection(record, 'initial_timeout');
          }
        }, 30000);
      }
    }, this.settings.initialDataTimeout!);

    // Make sure timeout doesn't keep the process alive
    if (initialTimeout.unref) {
      initialTimeout.unref();
    }

    // Set up error handler
    socket.on('error', this.connectionManager.handleError('incoming', record));

    // First data handler to capture initial TLS handshake
    socket.once('data', (chunk: Buffer) => {
      // Clear the initial timeout since we've received data
      if (initialTimeout) {
        clearTimeout(initialTimeout);
        initialTimeout = null;
      }

      initialDataReceived = true;
      record.hasReceivedInitialData = true;

      // Block non-TLS connections on port 443
      if (!this.tlsManager.isTlsHandshake(chunk) && localPort === 443) {
        console.log(
          `[${connectionId}] Non-TLS connection detected on port 443. ` +
            `Terminating connection - only TLS traffic is allowed on standard HTTPS port.`
        );
        if (record.incomingTerminationReason === null) {
          record.incomingTerminationReason = 'non_tls_blocked';
          this.connectionManager.incrementTerminationStat('incoming', 'non_tls_blocked');
        }
        socket.end();
        this.connectionManager.cleanupConnection(record, 'non_tls_blocked');
        return;
      }

      // Check if this looks like a TLS handshake
      let serverName = '';
      if (this.tlsManager.isTlsHandshake(chunk)) {
        record.isTLS = true;

        // Check for ClientHello to extract SNI
        if (this.tlsManager.isClientHello(chunk)) {
          // Create connection info for SNI extraction
          const connInfo = {
            sourceIp: record.remoteIP,
            sourcePort: socket.remotePort || 0,
            destIp: socket.localAddress || '',
            destPort: socket.localPort || 0,
          };

          // Extract SNI
          serverName = this.tlsManager.extractSNI(chunk, connInfo) || '';

          // Lock the connection to the negotiated SNI
          record.lockedDomain = serverName;

          // Check if we should reject connections without SNI
          if (!serverName && this.settings.allowSessionTicket === false) {
            console.log(`[${connectionId}] No SNI detected in TLS ClientHello; sending TLS alert.`);
            if (record.incomingTerminationReason === null) {
              record.incomingTerminationReason = 'session_ticket_blocked_no_sni';
              this.connectionManager.incrementTerminationStat('incoming', 'session_ticket_blocked_no_sni');
            }
            const alert = Buffer.from([0x15, 0x03, 0x03, 0x00, 0x02, 0x01, 0x70]);
            try { 
              socket.cork(); 
              socket.write(alert); 
              socket.uncork(); 
              socket.end(); 
            } catch { 
              socket.end(); 
            }
            this.connectionManager.cleanupConnection(record, 'session_ticket_blocked_no_sni');
            return;
          }

          if (this.settings.enableDetailedLogging) {
            console.log(`[${connectionId}] TLS connection with SNI: ${serverName || '(empty)'}`);
          }
        }
      }

      // Find the appropriate route for this connection
      this.routeConnection(socket, record, serverName, chunk);
    });
  }

  /**
   * Route the connection based on match criteria
   */
  private routeConnection(
    socket: plugins.net.Socket, 
    record: IConnectionRecord,
    serverName: string,
    initialChunk?: Buffer
  ): void {
    const connectionId = record.id;
    const localPort = record.localPort;
    const remoteIP = record.remoteIP;

    // Find matching route
    const routeMatch = this.routeManager.findMatchingRoute({
      port: localPort,
      domain: serverName,
      clientIp: remoteIP,
      path: undefined, // We don't have path info at this point
      tlsVersion: undefined // We don't extract TLS version yet
    });

    if (!routeMatch) {
      console.log(`[${connectionId}] No route found for ${serverName || 'connection'} on port ${localPort}`);

      // No matching route, use default/fallback handling
      console.log(`[${connectionId}] Using default route handling for connection`);

      // Check default security settings
      const defaultSecuritySettings = this.settings.defaults?.security;
      if (defaultSecuritySettings) {
        if (defaultSecuritySettings.allowedIps && defaultSecuritySettings.allowedIps.length > 0) {
          const isAllowed = this.securityManager.isIPAuthorized(
            remoteIP,
            defaultSecuritySettings.allowedIps,
            defaultSecuritySettings.blockedIps || []
          );

          if (!isAllowed) {
            console.log(`[${connectionId}] IP ${remoteIP} not in default allowed list`);
            socket.end();
            this.connectionManager.cleanupConnection(record, 'ip_blocked');
            return;
          }
        }
      }
      
      // Setup direct connection with default settings
      if (this.settings.defaults?.target) {
        // Use defaults from configuration
        const targetHost = this.settings.defaults.target.host;
        const targetPort = this.settings.defaults.target.port;

        return this.setupDirectConnection(
          socket,
          record,
          undefined,
          serverName,
          initialChunk,
          undefined,
          targetHost,
          targetPort
        );
      } else {
        // No default target available, terminate the connection
        console.log(`[${connectionId}] No default target configured. Closing connection.`);
        socket.end();
        this.connectionManager.cleanupConnection(record, 'no_default_target');
        return;
      }
    }
    
    // A matching route was found
    const route = routeMatch.route;
    
    if (this.settings.enableDetailedLogging) {
      console.log(
        `[${connectionId}] Route matched: "${route.name || 'unnamed'}" for ${serverName || 'connection'} on port ${localPort}`
      );
    }
    
    // Handle the route based on its action type
    switch (route.action.type) {
      case 'forward':
        return this.handleForwardAction(socket, record, route, initialChunk);
      
      case 'redirect':
        return this.handleRedirectAction(socket, record, route);
      
      case 'block':
        return this.handleBlockAction(socket, record, route);
      
      default:
        console.log(`[${connectionId}] Unknown action type: ${(route.action as any).type}`);
        socket.end();
        this.connectionManager.cleanupConnection(record, 'unknown_action');
    }
  }
  
  /**
   * Handle a forward action for a route
   */
  private handleForwardAction(
    socket: plugins.net.Socket,
    record: IConnectionRecord,
    route: IRouteConfig,
    initialChunk?: Buffer
  ): void {
    const connectionId = record.id;
    const action = route.action;
    
    // We should have a target configuration for forwarding
    if (!action.target) {
      console.log(`[${connectionId}] Forward action missing target configuration`);
      socket.end();
      this.connectionManager.cleanupConnection(record, 'missing_target');
      return;
    }
    
    // Determine if this needs TLS handling
    if (action.tls) {
      switch (action.tls.mode) {
        case 'passthrough':
          // For TLS passthrough, just forward directly
          if (this.settings.enableDetailedLogging) {
            console.log(`[${connectionId}] Using TLS passthrough to ${action.target.host}`);
          }
          
          // Allow for array of hosts
          const targetHost = Array.isArray(action.target.host) 
            ? action.target.host[Math.floor(Math.random() * action.target.host.length)]
            : action.target.host;
          
          // Determine target port - either target port or preserve incoming port
          const targetPort = action.target.preservePort ? record.localPort : action.target.port;
          
          return this.setupDirectConnection(
            socket,
            record,
            undefined,
            record.lockedDomain,
            initialChunk,
            undefined,
            targetHost,
            targetPort
          );
          
        case 'terminate':
        case 'terminate-and-reencrypt':
          // For TLS termination, use NetworkProxy
          if (this.networkProxyBridge.getNetworkProxy()) {
            if (this.settings.enableDetailedLogging) {
              console.log(
                `[${connectionId}] Using NetworkProxy for TLS termination to ${action.target.host}`
              );
            }
            
            // If we have an initial chunk with TLS data, start processing it
            if (initialChunk && record.isTLS) {
              return this.networkProxyBridge.forwardToNetworkProxy(
                connectionId,
                socket,
                record,
                initialChunk,
                this.settings.networkProxyPort,
                (reason) => this.connectionManager.initiateCleanupOnce(record, reason)
              );
            }
            
            // This shouldn't normally happen - we should have TLS data at this point
            console.log(`[${connectionId}] TLS termination route without TLS data`);
            socket.end();
            this.connectionManager.cleanupConnection(record, 'tls_error');
            return;
          } else {
            console.log(`[${connectionId}] NetworkProxy not available for TLS termination`);
            socket.end();
            this.connectionManager.cleanupConnection(record, 'no_network_proxy');
            return;
          }
      }
    } else {
      // No TLS settings - basic forwarding
      if (this.settings.enableDetailedLogging) {
        console.log(`[${connectionId}] Using basic forwarding to ${action.target.host}:${action.target.port}`);
      }
      
      // Allow for array of hosts
      const targetHost = Array.isArray(action.target.host) 
        ? action.target.host[Math.floor(Math.random() * action.target.host.length)]
        : action.target.host;
      
      // Determine target port - either target port or preserve incoming port
      const targetPort = action.target.preservePort ? record.localPort : action.target.port;
      
      return this.setupDirectConnection(
        socket,
        record,
        undefined,
        record.lockedDomain,
        initialChunk,
        undefined,
        targetHost,
        targetPort
      );
    }
  }
  
  /**
   * Handle a redirect action for a route
   */
  private handleRedirectAction(
    socket: plugins.net.Socket,
    record: IConnectionRecord,
    route: IRouteConfig
  ): void {
    const connectionId = record.id;
    const action = route.action;
    
    // We should have a redirect configuration
    if (!action.redirect) {
      console.log(`[${connectionId}] Redirect action missing redirect configuration`);
      socket.end();
      this.connectionManager.cleanupConnection(record, 'missing_redirect');
      return;
    }
    
    // For TLS connections, we can't do redirects at the TCP level
    if (record.isTLS) {
      console.log(`[${connectionId}] Cannot redirect TLS connection at TCP level`);
      socket.end();
      this.connectionManager.cleanupConnection(record, 'tls_redirect_error');
      return;
    }
    
    // Wait for the first HTTP request to perform the redirect
    const dataListeners: ((chunk: Buffer) => void)[] = [];
    
    const httpDataHandler = (chunk: Buffer) => {
      // Remove all data listeners to avoid duplicated processing
      for (const listener of dataListeners) {
        socket.removeListener('data', listener);
      }
      
      // Parse HTTP request to get path
      try {
        const headersEnd = chunk.indexOf('\r\n\r\n');
        if (headersEnd === -1) {
          // Not a complete HTTP request, need more data
          socket.once('data', httpDataHandler);
          dataListeners.push(httpDataHandler);
          return;
        }
        
        const httpHeaders = chunk.slice(0, headersEnd).toString();
        const requestLine = httpHeaders.split('\r\n')[0];
        const [method, path] = requestLine.split(' ');
        
        // Extract Host header
        const hostMatch = httpHeaders.match(/Host: (.+?)(\r\n|\r|\n|$)/i);
        const host = hostMatch ? hostMatch[1].trim() : record.lockedDomain || '';
        
        // Process the redirect URL with template variables
        let redirectUrl = action.redirect.to;
        redirectUrl = redirectUrl.replace(/\{domain\}/g, host);
        redirectUrl = redirectUrl.replace(/\{path\}/g, path || '');
        redirectUrl = redirectUrl.replace(/\{port\}/g, record.localPort.toString());
        
        // Prepare the HTTP redirect response
        const redirectResponse = [
          `HTTP/1.1 ${action.redirect.status} Moved`,
          `Location: ${redirectUrl}`,
          'Connection: close',
          'Content-Length: 0',
          '',
          ''
        ].join('\r\n');
        
        if (this.settings.enableDetailedLogging) {
          console.log(`[${connectionId}] Redirecting to ${redirectUrl} with status ${action.redirect.status}`);
        }
        
        // Send the redirect response
        socket.end(redirectResponse);
        this.connectionManager.initiateCleanupOnce(record, 'redirect_complete');
      } catch (err) {
        console.log(`[${connectionId}] Error processing HTTP redirect: ${err}`);
        socket.end();
        this.connectionManager.initiateCleanupOnce(record, 'redirect_error');
      }
    };
    
    // Setup the HTTP data handler
    socket.once('data', httpDataHandler);
    dataListeners.push(httpDataHandler);
  }
  
  /**
   * Handle a block action for a route
   */
  private handleBlockAction(
    socket: plugins.net.Socket,
    record: IConnectionRecord,
    route: IRouteConfig
  ): void {
    const connectionId = record.id;
    
    if (this.settings.enableDetailedLogging) {
      console.log(`[${connectionId}] Blocking connection based on route "${route.name || 'unnamed'}"`);
    }
    
    // Simply close the connection
    socket.end();
    this.connectionManager.initiateCleanupOnce(record, 'route_blocked');
  }
  
  /**
   * Legacy connection handling has been removed in favor of pure route-based approach
   */
  
  /**
   * Sets up a direct connection to the target
   */
  private setupDirectConnection(
    socket: plugins.net.Socket,
    record: IConnectionRecord,
    _unused?: any, // kept for backward compatibility
    serverName?: string,
    initialChunk?: Buffer,
    overridePort?: number,
    targetHost?: string,
    targetPort?: number
  ): void {
    const connectionId = record.id;

    // Determine target host and port if not provided
    const finalTargetHost = targetHost ||
      (this.settings.defaults?.target?.host || 'localhost');

    // Determine target port
    const finalTargetPort = targetPort ||
      (overridePort !== undefined ? overridePort :
       (this.settings.defaults?.target?.port || 443));

    // Setup connection options
    const connectionOptions: plugins.net.NetConnectOpts = {
      host: finalTargetHost,
      port: finalTargetPort,
    };

    // Preserve source IP if configured
    if (this.settings.defaults?.preserveSourceIP || this.settings.preserveSourceIP) {
      connectionOptions.localAddress = record.remoteIP.replace('::ffff:', '');
    }
    
    // Create a safe queue for incoming data
    const dataQueue: Buffer[] = [];
    let queueSize = 0;
    let processingQueue = false;
    let drainPending = false;
    let pipingEstablished = false;
    
    // Pause the incoming socket to prevent buffer overflows
    socket.pause();
    
    // Function to safely process the data queue without losing events
    const processDataQueue = () => {
      if (processingQueue || dataQueue.length === 0 || pipingEstablished) return;
      
      processingQueue = true;
      
      try {
        // Process all queued chunks with the current active handler
        while (dataQueue.length > 0) {
          const chunk = dataQueue.shift()!;
          queueSize -= chunk.length;
          
          // Once piping is established, we shouldn't get here,
          // but just in case, pass to the outgoing socket directly
          if (pipingEstablished && record.outgoing) {
            record.outgoing.write(chunk);
            continue;
          }
          
          // Track bytes received
          record.bytesReceived += chunk.length;
          
          // Check for TLS handshake
          if (!record.isTLS && this.tlsManager.isTlsHandshake(chunk)) {
            record.isTLS = true;
            
            if (this.settings.enableTlsDebugLogging) {
              console.log(
                `[${connectionId}] TLS handshake detected in tempDataHandler, ${chunk.length} bytes`
              );
            }
          }
          
          // Check if adding this chunk would exceed the buffer limit
          const newSize = record.pendingDataSize + chunk.length;
          
          if (this.settings.maxPendingDataSize && newSize > this.settings.maxPendingDataSize) {
            console.log(
              `[${connectionId}] Buffer limit exceeded for connection from ${record.remoteIP}: ${newSize} bytes > ${this.settings.maxPendingDataSize} bytes`
            );
            socket.end(); // Gracefully close the socket
            this.connectionManager.initiateCleanupOnce(record, 'buffer_limit_exceeded');
            return;
          }
          
          // Buffer the chunk and update the size counter
          record.pendingData.push(Buffer.from(chunk));
          record.pendingDataSize = newSize;
          this.timeoutManager.updateActivity(record);
        }
      } finally {
        processingQueue = false;
        
        // If there's a pending drain and we've processed everything,
        // signal we're ready for more data if we haven't established piping yet
        if (drainPending && dataQueue.length === 0 && !pipingEstablished) {
          drainPending = false;
          socket.resume();
        }
      }
    };
    
    // Unified data handler that safely queues incoming data
    const safeDataHandler = (chunk: Buffer) => {
      // If piping is already established, just let the pipe handle it
      if (pipingEstablished) return;
      
      // Add to our queue for orderly processing
      dataQueue.push(Buffer.from(chunk)); // Make a copy to be safe
      queueSize += chunk.length;
      
      // If queue is getting large, pause socket until we catch up
      if (this.settings.maxPendingDataSize && queueSize > this.settings.maxPendingDataSize * 0.8) {
        socket.pause();
        drainPending = true;
      }
      
      // Process the queue
      processDataQueue();
    };
    
    // Add our safe data handler
    socket.on('data', safeDataHandler);
    
    // Add initial chunk to pending data if present
    if (initialChunk) {
      record.bytesReceived += initialChunk.length;
      record.pendingData.push(Buffer.from(initialChunk));
      record.pendingDataSize = initialChunk.length;
    }
    
    // Create the target socket but don't set up piping immediately
    const targetSocket = plugins.net.connect(connectionOptions);
    record.outgoing = targetSocket;
    record.outgoingStartTime = Date.now();
    
    // Apply socket optimizations
    targetSocket.setNoDelay(this.settings.noDelay);
    
    // Apply keep-alive settings to the outgoing connection as well
    if (this.settings.keepAlive) {
      targetSocket.setKeepAlive(true, this.settings.keepAliveInitialDelay);
      
      // Apply enhanced TCP keep-alive options if enabled
      if (this.settings.enableKeepAliveProbes) {
        try {
          if ('setKeepAliveProbes' in targetSocket) {
            (targetSocket as any).setKeepAliveProbes(10);
          }
          if ('setKeepAliveInterval' in targetSocket) {
            (targetSocket as any).setKeepAliveInterval(1000);
          }
        } catch (err) {
          // Ignore errors - these are optional enhancements
          if (this.settings.enableDetailedLogging) {
            console.log(
              `[${connectionId}] Enhanced TCP keep-alive not supported for outgoing socket: ${err}`
            );
          }
        }
      }
    }
    
    // Setup specific error handler for connection phase
    targetSocket.once('error', (err) => {
      // This handler runs only once during the initial connection phase
      const code = (err as any).code;
      console.log(
        `[${connectionId}] Connection setup error to ${finalTargetHost}:${connectionOptions.port}: ${err.message} (${code})`
      );
      
      // Resume the incoming socket to prevent it from hanging
      socket.resume();
      
      if (code === 'ECONNREFUSED') {
        console.log(
          `[${connectionId}] Target ${finalTargetHost}:${connectionOptions.port} refused connection`
        );
      } else if (code === 'ETIMEDOUT') {
        console.log(
          `[${connectionId}] Connection to ${finalTargetHost}:${connectionOptions.port} timed out`
        );
      } else if (code === 'ECONNRESET') {
        console.log(
          `[${connectionId}] Connection to ${finalTargetHost}:${connectionOptions.port} was reset`
        );
      } else if (code === 'EHOSTUNREACH') {
        console.log(`[${connectionId}] Host ${finalTargetHost} is unreachable`);
      }
      
      // Clear any existing error handler after connection phase
      targetSocket.removeAllListeners('error');
      
      // Re-add the normal error handler for established connections
      targetSocket.on('error', this.connectionManager.handleError('outgoing', record));
      
      if (record.outgoingTerminationReason === null) {
        record.outgoingTerminationReason = 'connection_failed';
        this.connectionManager.incrementTerminationStat('outgoing', 'connection_failed');
      }
      
      // If we have a forwarding handler for this domain, let it handle the error
      if (domainConfig) {
        try {
          const forwardingHandler = this.domainConfigManager.getForwardingHandler(domainConfig);
          forwardingHandler.emit('connection_error', {
            socket,
            error: err,
            connectionId
          });
        } catch (handlerErr) {
          // If getting the handler fails, just log and continue with normal cleanup
          console.log(`Error getting forwarding handler for error handling: ${handlerErr}`);
        }
      }
      
      // Clean up the connection
      this.connectionManager.initiateCleanupOnce(record, `connection_failed_${code}`);
    });
    
    // Setup close handler
    targetSocket.on('close', this.connectionManager.handleClose('outgoing', record));
    socket.on('close', this.connectionManager.handleClose('incoming', record));
    
    // Handle timeouts with keep-alive awareness
    socket.on('timeout', () => {
      // For keep-alive connections, just log a warning instead of closing
      if (record.hasKeepAlive) {
        console.log(
          `[${connectionId}] Timeout event on incoming keep-alive connection from ${
            record.remoteIP
          } after ${plugins.prettyMs(
            this.settings.socketTimeout || 3600000
          )}. Connection preserved.`
        );
        return;
      }
      
      // For non-keep-alive connections, proceed with normal cleanup
      console.log(
        `[${connectionId}] Timeout on incoming side from ${
          record.remoteIP
        } after ${plugins.prettyMs(this.settings.socketTimeout || 3600000)}`
      );
      if (record.incomingTerminationReason === null) {
        record.incomingTerminationReason = 'timeout';
        this.connectionManager.incrementTerminationStat('incoming', 'timeout');
      }
      this.connectionManager.initiateCleanupOnce(record, 'timeout_incoming');
    });
    
    targetSocket.on('timeout', () => {
      // For keep-alive connections, just log a warning instead of closing
      if (record.hasKeepAlive) {
        console.log(
          `[${connectionId}] Timeout event on outgoing keep-alive connection from ${
            record.remoteIP
          } after ${plugins.prettyMs(
            this.settings.socketTimeout || 3600000
          )}. Connection preserved.`
        );
        return;
      }
      
      // For non-keep-alive connections, proceed with normal cleanup
      console.log(
        `[${connectionId}] Timeout on outgoing side from ${
          record.remoteIP
        } after ${plugins.prettyMs(this.settings.socketTimeout || 3600000)}`
      );
      if (record.outgoingTerminationReason === null) {
        record.outgoingTerminationReason = 'timeout';
        this.connectionManager.incrementTerminationStat('outgoing', 'timeout');
      }
      this.connectionManager.initiateCleanupOnce(record, 'timeout_outgoing');
    });
    
    // Apply socket timeouts
    this.timeoutManager.applySocketTimeouts(record);
    
    // Track outgoing data for bytes counting
    targetSocket.on('data', (chunk: Buffer) => {
      record.bytesSent += chunk.length;
      this.timeoutManager.updateActivity(record);
    });
    
    // Wait for the outgoing connection to be ready before setting up piping
    targetSocket.once('connect', () => {
      // Clear the initial connection error handler
      targetSocket.removeAllListeners('error');
      
      // Add the normal error handler for established connections
      targetSocket.on('error', this.connectionManager.handleError('outgoing', record));
      
      // Process any remaining data in the queue before switching to piping
      processDataQueue();
      
      // Set up piping immediately
      pipingEstablished = true;
      
      // Flush all pending data to target
      if (record.pendingData.length > 0) {
        const combinedData = Buffer.concat(record.pendingData);
        
        if (this.settings.enableDetailedLogging) {
          console.log(
            `[${connectionId}] Forwarding ${combinedData.length} bytes of initial data to target`
          );
        }
        
        // Write pending data immediately
        targetSocket.write(combinedData, (err) => {
          if (err) {
            console.log(`[${connectionId}] Error writing pending data to target: ${err.message}`);
            return this.connectionManager.initiateCleanupOnce(record, 'write_error');
          }
        });
        
        // Clear the buffer now that we've processed it
        record.pendingData = [];
        record.pendingDataSize = 0;
      }
      
      // Setup piping in both directions without any delays
      socket.pipe(targetSocket);
      targetSocket.pipe(socket);
      
      // Resume the socket to ensure data flows
      socket.resume();
      
      // Process any data that might be queued in the interim
      if (dataQueue.length > 0) {
        // Write any remaining queued data directly to the target socket
        for (const chunk of dataQueue) {
          targetSocket.write(chunk);
        }
        // Clear the queue
        dataQueue.length = 0;
        queueSize = 0;
      }
      
      if (this.settings.enableDetailedLogging) {
        console.log(
          `[${connectionId}] Connection established: ${record.remoteIP} -> ${finalTargetHost}:${connectionOptions.port}` +
            `${
              serverName
                ? ` (SNI: ${serverName})`
                : domainConfig
                ? ` (Port-based for domain: ${domainConfig.domains.join(', ')})`
                : ''
            }` +
            ` TLS: ${record.isTLS ? 'Yes' : 'No'}, Keep-Alive: ${
              record.hasKeepAlive ? 'Yes' : 'No'
            }`
        );
      } else {
        console.log(
          `Connection established: ${record.remoteIP} -> ${finalTargetHost}:${connectionOptions.port}` +
            `${
              serverName
                ? ` (SNI: ${serverName})`
                : domainConfig
                ? ` (Port-based for domain: ${domainConfig.domains.join(', ')})`
                : ''
            }`
        );
      }
      
      // Add the renegotiation handler for SNI validation
      if (serverName) {
        // Create connection info object for the existing connection
        const connInfo = {
          sourceIp: record.remoteIP,
          sourcePort: record.incoming.remotePort || 0,
          destIp: record.incoming.localAddress || '',
          destPort: record.incoming.localPort || 0,
        };
        
        // Create a renegotiation handler function
        const renegotiationHandler = this.tlsManager.createRenegotiationHandler(
          connectionId,
          serverName,
          connInfo,
          (connectionId, reason) => this.connectionManager.initiateCleanupOnce(record, reason)
        );
        
        // Store the handler in the connection record so we can remove it during cleanup
        record.renegotiationHandler = renegotiationHandler;
        
        // Add the handler to the socket
        socket.on('data', renegotiationHandler);
        
        if (this.settings.enableDetailedLogging) {
          console.log(
            `[${connectionId}] TLS renegotiation handler installed for SNI domain: ${serverName}`
          );
          if (this.settings.allowSessionTicket === false) {
            console.log(
              `[${connectionId}] Session ticket usage is disabled. Connection will be reset on reconnection attempts.`
            );
          }
        }
      }
      
      // Set connection timeout
      record.cleanupTimer = this.timeoutManager.setupConnectionTimeout(record, (record, reason) => {
        console.log(
          `[${connectionId}] Connection from ${record.remoteIP} exceeded max lifetime, forcing cleanup.`
        );
        this.connectionManager.initiateCleanupOnce(record, reason);
      });
      
      // Mark TLS handshake as complete for TLS connections
      if (record.isTLS) {
        record.tlsHandshakeComplete = true;
        
        if (this.settings.enableTlsDebugLogging) {
          console.log(
            `[${connectionId}] TLS handshake complete for connection from ${record.remoteIP}`
          );
        }
      }
    });
  }
}