import { ModuleRef } from '@nestjs/core';
import { Response } from 'express';
import { Request } from 'express';
import { AgentToAgentModuleOptions } from '../interfaces/a2a.options';
import { CancelTaskRequest, GetTaskPushNotificationRequest, GetTaskRequest, JSONRPCResponse, SendTaskRequest, SendTaskStreamingRequest, TaskResubscriptionRequest } from '../interfaces/a2a.types';
import { A2ARegistry } from './a2a.registry';
/**
 * Implements the A2A executor for handling A2A protocol requests in NestJS.
 */
export declare class A2AExecutor {
    private readonly options;
    private readonly request;
    private readonly registry;
    readonly moduleRef: ModuleRef;
    private readonly logger;
    private readonly taskStore;
    private readonly activeCancellations;
    constructor(options: AgentToAgentModuleOptions, request: Request, registry: A2ARegistry, moduleRef: ModuleRef);
    /**
     * Handles a task send request (non-streaming).
     */
    handleTaskSend(body: SendTaskRequest): Promise<JSONRPCResponse>;
    /**
     * Handles a task send request with streaming response.
     */
    handleTaskSendSubscribe(body: SendTaskStreamingRequest, response: Response): Promise<void>;
    /**
     * Handles a task get request.
     */
    handleTaskGet(body: GetTaskRequest): Promise<JSONRPCResponse>;
    /**
     * Handles a task cancel request.
     */
    handleTaskCancel(body: CancelTaskRequest): Promise<JSONRPCResponse>;
    /**
     * Handles a task resubscribe request.
     * Not fully implemented yet - returns unsupported operation error.
     */
    handleTaskResubscribe(_body: TaskResubscriptionRequest): Promise<JSONRPCResponse>;
    /**
     * Handles a task get push notification request.
     * Not fully implemented yet - returns unsupported operation error.
     */
    handleTaskGetPushNotification(_body: GetTaskPushNotificationRequest): Promise<JSONRPCResponse>;
    /**
     * Loads an existing task or creates a new one with the given message.
     */
    private loadOrCreateTaskAndHistory;
    /**
     * Creates a task context object for the handler.
     */
    private createTaskContext;
    /**
     * Finds an appropriate handler for the given task and message.
     * Currently just returns a default handler, but could be enhanced to select
     * based on task type, message content, etc.
     */
    private findHandlerForTask;
    /**
     * Validates the parameters for a task send request.
     */
    private validateTaskSendParams;
    /**
     * Helper to apply updates (status or artifact) immutably to a task and history.
     */
    private applyUpdateToTaskAndHistory;
    /**
     * Type guard to check if an update is a task status update.
     */
    private isTaskStatusUpdate;
    /**
     * Creates a TaskStatusUpdateEvent object.
     */
    private createTaskStatusEvent;
    /**
     * Gets the current timestamp in ISO format.
     */
    private getCurrentTimestamp;
    /**
     * Handles errors by converting them to appropriate JSON-RPC responses.
     */
    private handleError;
}