/**
 * Session and conversation history management
 */
import type { Session, Message, SessionMetadata, Configuration, ToolCall, SessionInfo, CompactionResult, CompactionConfig } from '../types/index.js';
/**
 * Create a new session
 */
export declare function createSession(workingDirectory: string, currentModel: string, isContinuation?: boolean): Session;
/**
 * Load session from history
 */
export declare function loadSession(workingDirectory: string, currentModel: string, config: Configuration): Promise<Session>;
/**
 * Add a user message to session
 */
export declare function addUserMessage(session: Session, content: string): Message;
/**
 * Add an assistant message to session
 */
export declare function addAssistantMessage(session: Session, content: string, model: string, metadata?: {
    tokensUsed?: number;
    streamingDuration?: number;
    toolCalls?: ToolCall[];
}): Message;
/**
 * Save message to history file
 */
export declare function saveMessage(workingDirectory: string, message: Message): Promise<void>;
/**
 * Save session messages to history
 */
export declare function saveSession(session: Session, config: Configuration): Promise<void>;
/**
 * Clear session history
 */
export declare function clearHistory(workingDirectory: string): Promise<void>;
/**
 * Get recent messages (for display)
 */
export declare function getRecentMessages(session: Session, count?: number): Message[];
/**
 * Get conversation messages for API (without metadata)
 */
export declare function getConversationForAPI(session: Session): Array<{
    role: string;
    content: string;
}>;
/**
 * Update session model
 */
export declare function updateSessionModel(session: Session, modelId: string): Session;
/**
 * Get session statistics
 */
export declare function getSessionStats(session: Session): SessionMetadata;
/**
 * Check if session has messages
 */
export declare function hasMessages(session: Session): boolean;
/**
 * Get last user message
 */
export declare function getLastUserMessage(session: Session): Message | null;
/**
 * Get last assistant message
 */
export declare function getLastAssistantMessage(session: Session): Message | null;
/**
 * Create a new session with multi-session support
 * Automatically creates session metadata and history file
 */
export declare function createNewSession(workingDirectory: string, currentModel: string): Promise<Session>;
/**
 * Load current session from metadata
 */
export declare function loadCurrentSession(workingDirectory: string): Promise<Session | null>;
/**
 * Register a new session in metadata
 */
export declare function registerSession(workingDirectory: string, sessionInfo: SessionInfo): Promise<void>;
/**
 * Save session to session-specific history file
 */
export declare function saveSessionToHistory(session: Session): Promise<void>;
/**
 * Clear conversation history (reset messages to empty array)
 */
export declare function clearConversationHistory(session: Session): Promise<Session>;
/**
 * Migrate from legacy single-file format to multi-session
 */
export declare function migrateToMultiSession(workingDirectory: string): Promise<boolean>;
/**
 * Estimate token count for conversation
 */
export declare function estimateConversationTokensLocal(messages: Message[]): number;
/**
 * Compact conversation using AI summarization
 */
export declare function compactConversation(session: Session, config: CompactionConfig, apiKey: string): Promise<CompactionResult>;
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