/**
 * @toolplex/ai-engine - Chat Engine
 *
 * Core streaming engine that orchestrates AI chat sessions.
 * Uses adapters for all platform-specific I/O operations.
 */
import type { EngineAdapter } from "../adapters/types.js";
import type { StreamOptions, StreamResult, EngineConfig } from "../types/index.js";
import type { AutomationContext } from "../mcp/types.js";
export interface ChatEngineOptions {
    adapter: EngineAdapter;
    config?: EngineConfig;
}
export declare class ChatEngine {
    private adapter;
    private config;
    private initialized;
    constructor(options: ChatEngineOptions);
    /**
     * Initialize the engine
     */
    initialize(): Promise<void>;
    /**
     * Shutdown the engine
     */
    shutdown(): Promise<void>;
    /**
     * Initialize MCP for a session
     * @param userId - Optional user ID for system API keys (per-user telemetry)
     * @param clientMode - Client mode: standard, restricted, or automation
     * @param automationContext - Optional automation context for HITL support (automation mode only)
     */
    initializeMCP(sessionId: string, userId?: string, clientMode?: "standard" | "restricted" | "automation", automationContext?: AutomationContext): Promise<void>;
    /**
     * Initialize a session with ToolPlex context
     * @param userId - Optional user ID for system API keys (per-user telemetry)
     * @param clientMode - Client mode: standard, restricted, or automation
     * @param automationContext - Optional automation context for HITL support (automation mode only)
     */
    initializeSession(sessionId: string, modelId: string, provider: string, userId?: string, clientMode?: "standard" | "restricted" | "automation", automationContext?: AutomationContext): Promise<{
        success: boolean;
        context?: string;
        error?: string;
    }>;
    /**
     * Stream a chat completion
     */
    stream(options: StreamOptions): Promise<StreamResult>;
    /**
     * Process messages for streaming (handle attachments, filter empty blocks)
     */
    private processMessages;
}
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