/**
 * Specialist Session Manager
 *
 * Manages persistent, contextual conversations with BC specialist personas.
 * Supports in-memory sessions by default with layer-configurable persistence.
 */
import { SpecialistSession, SessionSummary, SessionMessage, SessionContext, SessionManager, SessionStorageConfig, SessionEvents } from '../types/session-types.js';
import { MultiContentLayerService } from './multi-content-layer-service.js';
export declare class SpecialistSessionManager implements SessionManager {
    private storage;
    private layerService;
    private events;
    constructor(layerService: MultiContentLayerService, storageConfig?: SessionStorageConfig);
    /**
     * Start a new specialist session
     */
    startSession(specialistId: string, userId: string, initialMessage?: string): Promise<SpecialistSession>;
    /**
     * Get existing session
     */
    getSession(sessionId: string): Promise<SpecialistSession | null>;
    /**
     * Continue existing session with new message
     */
    continueSession(sessionId: string, message: string): Promise<SpecialistSession>;
    /**
     * Transfer session to different specialist
     */
    transferSession(sessionId: string, toSpecialistId: string): Promise<SpecialistSession>;
    /**
     * End session
     */
    endSession(sessionId: string): Promise<void>;
    /**
     * List user's sessions
     */
    listUserSessions(userId: string): Promise<SessionSummary[]>;
    /**
     * List user's active sessions
     */
    listActiveSessions(userId: string): Promise<SessionSummary[]>;
    /**
     * Add message to session
     */
    addMessage(sessionId: string, message: SessionMessage): Promise<void>;
    /**
     * Update session context
     */
    updateContext(sessionId: string, context: Partial<SessionContext>): Promise<void>;
    /**
     * Cleanup expired sessions
     */
    cleanupSessions(): Promise<number>;
    /**
     * Subscribe to session events
     */
    on<K extends keyof SessionEvents>(event: K, handler: SessionEvents[K]): void;
    /**
     * Get session statistics
     */
    getSessionStats(userId?: string): Promise<{
        totalSessions: number;
        activeSessions: number;
        totalMessages: number;
        averageSessionLength: number;
    }>;
    /**
     * Initialize storage based on configuration
     */
    private initializeStorage;
    /**
     * Get all session summaries (for stats)
     */
    private getAllSessionSummaries;
}
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