import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { DuckDBService } from '../duckdb/service.js';
/**
 * Configuration for MCP Client
 */
export interface MCPClientConfig {
    name?: string;
    version?: string;
    cacheEnabled?: boolean;
    cacheTTL?: number;
    maxRetries?: number;
}
/**
 * Represents an attached MCP server
 */
export interface AttachedServer {
    alias: string;
    url: string;
    transport: 'stdio' | 'http' | 'websocket' | 'tcp';
    client: Client;
    resources?: any[];
    tools?: any[];
    lastRefresh?: Date;
}
/**
 * MCP Client for connecting to external MCP servers
 * and creating virtual tables in DuckDB
 */
export declare class MCPClient {
    private config;
    private attachedServers;
    private resourceCache;
    private duckdb;
    constructor(config?: MCPClientConfig);
    /**
     * Set DuckDB service for virtual table creation
     */
    setDuckDBService(duckdb: DuckDBService): void;
    /**
     * Attach an external MCP server
     */
    attachServer(url: string, alias: string, transport?: 'stdio' | 'http' | 'websocket' | 'tcp'): Promise<void>;
    /**
     * Detach a server
     */
    detachServer(alias: string): Promise<void>;
    /**
     * List all attached servers
     */
    listAttachedServers(): AttachedServer[];
    /**
     * Get a specific attached server
     */
    getAttachedServer(alias: string): AttachedServer | undefined;
    /**
     * List resources from a specific server or all servers
     */
    listResources(serverAlias?: string): Promise<any[]>;
    /**
     * Read a resource from a server
     */
    readResource(uri: string, serverAlias?: string, useCache?: boolean): Promise<any>;
    /**
     * Create a virtual table in DuckDB from an MCP resource
     */
    createVirtualTable(tableName: string, resourceUri: string, serverAlias?: string): Promise<void>;
    /**
     * Refresh a virtual table by re-reading the resource
     */
    refreshVirtualTable(tableName: string, resourceUri: string, serverAlias?: string): Promise<void>;
    /**
     * Execute a tool on an attached server
     */
    callTool(serverAlias: string, toolName: string, args: any): Promise<any>;
    /**
     * Clear resource cache
     */
    clearCache(serverAlias?: string): void;
    /**
     * Disconnect all servers
     */
    disconnectAll(): Promise<void>;
}
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