/**
 * SMTP Session Manager
 * Responsible for creating, managing, and cleaning up SMTP sessions
 */
import * as plugins from '../../../plugins.js';
import { SmtpState } from './interfaces.js';
import type { ISmtpSession } from './interfaces.js';
import type { ISessionManager, ISessionEvents } from './interfaces.js';
/**
 * Manager for SMTP sessions
 * Handles session creation, tracking, timeout management, and cleanup
 */
export declare class SessionManager implements ISessionManager {
    /**
     * Map of socket ID to session
     */
    private sessions;
    /**
     * Map of socket to socket ID
     */
    private socketIds;
    /**
     * SMTP server options
     */
    private options;
    /**
     * Event listeners
     */
    private eventListeners;
    /**
     * Timer for cleanup interval
     */
    private cleanupTimer;
    /**
     * Creates a new session manager
     * @param options - Session manager options
     */
    constructor(options?: {
        socketTimeout?: number;
        connectionTimeout?: number;
        cleanupInterval?: number;
    });
    /**
     * Creates a new session for a socket connection
     * @param socket - Client socket
     * @param secure - Whether the connection is secure (TLS)
     * @returns New SMTP session
     */
    createSession(socket: plugins.net.Socket | plugins.tls.TLSSocket, secure: boolean): ISmtpSession;
    /**
     * Updates the session state
     * @param session - SMTP session
     * @param newState - New state
     */
    updateSessionState(session: ISmtpSession, newState: SmtpState): void;
    /**
     * Updates the session's last activity timestamp
     * @param session - SMTP session
     */
    updateSessionActivity(session: ISmtpSession): void;
    /**
     * Removes a session
     * @param socket - Client socket
     */
    removeSession(socket: plugins.net.Socket | plugins.tls.TLSSocket): void;
    /**
     * Gets a session for a socket
     * @param socket - Client socket
     * @returns SMTP session or undefined if not found
     */
    getSession(socket: plugins.net.Socket | plugins.tls.TLSSocket): ISmtpSession | undefined;
    /**
     * Cleans up idle sessions
     */
    cleanupIdleSessions(): void;
    /**
     * Gets the current number of active sessions
     * @returns Number of active sessions
     */
    getSessionCount(): number;
    /**
     * Clears all sessions (used when shutting down)
     */
    clearAllSessions(): void;
    /**
     * Register an event listener
     * @param event - Event name
     * @param listener - Event listener function
     */
    on<K extends keyof ISessionEvents>(event: K, listener: ISessionEvents[K]): void;
    /**
     * Remove an event listener
     * @param event - Event name
     * @param listener - Event listener function
     */
    off<K extends keyof ISessionEvents>(event: K, listener: ISessionEvents[K]): void;
    /**
     * Emit an event to registered listeners
     * @param event - Event name
     * @param args - Event arguments
     */
    private emitEvent;
    /**
     * Start the cleanup timer
     */
    private startCleanupTimer;
    /**
     * Stop the cleanup timer
     */
    private stopCleanupTimer;
    /**
     * Replace socket mapping for STARTTLS upgrades
     * @param oldSocket - Original plain socket
     * @param newSocket - New TLS socket
     * @returns Whether the replacement was successful
     */
    replaceSocket(oldSocket: plugins.net.Socket | plugins.tls.TLSSocket, newSocket: plugins.net.Socket | plugins.tls.TLSSocket): boolean;
    /**
     * Gets a unique key for a socket
     * @param socket - Client socket
     * @returns Socket key
     */
    private getSocketKey;
    /**
     * Get all active sessions
     */
    getAllSessions(): ISmtpSession[];
    /**
     * Update last activity for a session by socket
     */
    updateLastActivity(socket: plugins.net.Socket | plugins.tls.TLSSocket): void;
    /**
     * Check for timed out sessions
     */
    checkTimeouts(timeoutMs: number): ISmtpSession[];
    /**
     * Clean up resources
     */
    destroy(): void;
}