/**
 * Conversation Memory Manager for NeuroLink
 * Handles in-memory conversation storage, session management, and context injection
 */
import type { ChatMessage, ConversationMemoryConfig, ConversationMemoryStats, SessionListItem, SessionMemory, StoreConversationTurnOptions, IConversationMemoryManager } from "../types/index.js";
export declare class ConversationMemoryManager implements IConversationMemoryManager {
    private sessions;
    config: ConversationMemoryConfig;
    private isInitialized;
    private summarizationEngine;
    /**
     * Track sessions currently being summarized to prevent race conditions
     */
    private summarizationInProgress;
    constructor(config: ConversationMemoryConfig);
    /**
     * Initialize the memory manager
     */
    initialize(): Promise<void>;
    /** Whether this memory manager can persist data (always true for in-memory within process) */
    get canPersist(): boolean;
    /** Whether Redis client is configured (always false for in-memory) */
    get isRedisConfigured(): boolean;
    /** Get health status for monitoring */
    getHealthStatus(): {
        initialized: boolean;
        connected: boolean;
    };
    /**
     * Store a conversation turn for a session
     * TOKEN-BASED: Validates message size and triggers summarization based on tokens
     */
    storeConversationTurn(options: StoreConversationTurnOptions): Promise<void>;
    /**
     * Validate and prepare a message before adding to session
     * Truncates if message exceeds token limit
     */
    private validateAndPrepareMessage;
    /**
     * Check if summarization is needed based on token count
     */
    private checkAndSummarize;
    /**
     * Estimate total tokens for a list of messages
     */
    private estimateTokens;
    /**
     * Build context messages for AI prompt injection (TOKEN-BASED)
     * Returns messages from pointer onwards (or all if no pointer)
     * Now consistently async to match Redis implementation
     */
    buildContextMessages(sessionId: string, _userId?: string, _enableSummarization?: boolean, requestId?: string): Promise<ChatMessage[]>;
    getSession(sessionId: string, _userId?: string): SessionMemory | undefined;
    createSummarySystemMessage(content: string, summarizesFrom?: string, summarizesTo?: string): ChatMessage;
    private ensureInitialized;
    private createNewSession;
    private enforceSessionLimit;
    getStats(): Promise<ConversationMemoryStats>;
    /**
     * List all sessions with metadata
     * @param userId - Optional user ID to filter sessions
     * @returns Array of session list items with metadata
     */
    listSessions(userId?: string): Promise<SessionListItem[]>;
    /**
     * Format milliseconds into human-readable time ago string
     */
    private formatTimeAgo;
    clearSession(sessionId: string): Promise<boolean>;
    clearAllSessions(): Promise<void>;
    /**
     * Get the raw messages array for a session.
     * Returns the full messages list without context filtering or summarization.
     * Returns a deep copy to prevent external mutation of internal state.
     */
    getSessionMessages(sessionId: string, _userId?: string): Promise<ChatMessage[]>;
    /**
     * Replace the entire messages array for a session.
     * Creates the session if it does not exist.
     * Resets summary pointers since old pointers may reference messages that no longer exist.
     */
    setSessionMessages(sessionId: string, messages: ChatMessage[], userId?: string): Promise<void>;
    /**
     * Persist a step's tool calls and results as `tool_call` / `tool_result`
     * messages, mirroring the Redis manager.
     *
     * Parity fix: this used to exist only on the Redis backend, so an in-memory
     * session never turned tool activity into messages and every downstream path
     * that reasons about tool batches (compaction, pruning, pair repair) saw a
     * different history shape depending on `STORAGE_TYPE`.
     *
     * Calls are written before results — the same order the Redis flush uses —
     * and `toolCallId` is carried on BOTH sides so `repairToolPairs` can match by
     * id rather than adjacency (a parallel batch has no positional pairing).
     */
    storeToolExecution(sessionId: string, userId: string | undefined, toolCalls: Array<{
        toolCallId?: string;
        toolName?: string;
        args?: Record<string, unknown>;
        [key: string]: unknown;
    }>, toolResults: Array<{
        toolCallId?: string;
        output?: unknown;
        result?: unknown;
        error?: string;
        [key: string]: unknown;
    }>, currentTime?: Date): Promise<void>;
    /** Close/shutdown — no-op for in-memory manager (no external connections to release) */
    close(): Promise<void>;
}