import { Task, TaskNotFoundError, TaskNotCancelableError } from "../../types/types.ts";
import { AgentExecutionContext } from "./context.ts";
import type { AgentExecutionResult } from "./types.ts";
/**
 * Interface for implementing agent execution logic within the A2A protocol
 *
 * The IAgentExecutor defines the contract for processing agent requests and managing
 * task lifecycle. Implementations of this interface contain the core business logic
 * for handling messages, executing tasks, and managing agent behavior.
 */
interface IAgentExecutor {
    /**
     * Executes an agent request within the provided execution context
     *
     * This method is called by the A2A server to process incoming messages and tasks.
     * The implementation should handle the request appropriately and return one of:
     * - A completed Task
     * - A Message response
     * - A StreamResult for long-running operations
     * - An A2AError for error conditions
     *
     * @param context - The execution context containing request data, task information, and utilities
     * @returns Promise resolving to the execution result
     */
    execute(context: AgentExecutionContext): Promise<AgentExecutionResult>;
    /**
     * Attempts to cancel an active task
     *
     * This method is called when a client requests task cancellation. The implementation
     * should attempt to stop the task execution gracefully and return the updated task
     * with appropriate status, or return an error if cancellation is not possible.
     *
     * @param task - The task to cancel
     * @returns Promise resolving to the updated task or an error indicating why cancellation failed
     */
    cancel(task: Task): Promise<Task | TaskNotFoundError | TaskNotCancelableError>;
}
export type { IAgentExecutor };