import { Content } from '../models/types';
import { Event } from '../events/Event';
import { CallbackContext } from './CallbackContext';
import { InvocationContext } from './InvocationContext';
/**
 * Callback signature that is invoked before the agent run.
 *
 * @param callbackContext The callback context.
 * @returns The content to return to the user. When set, the agent run will be skipped and
 * the provided content will be returned to user.
 */
export type BeforeAgentCallback = (callbackContext: CallbackContext) => Content | undefined;
/**
 * Callback signature that is invoked after the agent run.
 *
 * @param callbackContext The callback context.
 * @returns The content to return to the user. When set, the agent run will be skipped and
 * the provided content will be appended to event history as agent response.
 */
export type AfterAgentCallback = (callbackContext: CallbackContext) => Content | undefined;
/**
 * Options for agent configuration.
 */
export interface AgentOptions {
    /** The description of the agent */
    description?: string;
    /** The parent agent */
    parentAgent?: BaseAgent;
    /** Additional agent-specific options */
    [key: string]: any;
}
/**
 * Abstract base class for all agents.
 */
export declare abstract class BaseAgent {
    /** The name of the agent */
    name: string;
    /** The description of the agent */
    description?: string;
    /** The parent agent of this agent */
    parentAgent?: BaseAgent;
    /** The sub-agents of this agent */
    subAgents: BaseAgent[];
    /** Callback invoked before the agent run */
    beforeAgentCallback?: BeforeAgentCallback;
    /** Callback invoked after the agent run */
    afterAgentCallback?: AfterAgentCallback;
    /**
     * Creates a new agent.
     *
     * @param name The name of the agent
     * @param options Options for the agent
     */
    constructor(name: string, options?: AgentOptions);
    /**
     * Invokes the agent with the given context.
     *
     * @param invocationContext The invocation context
     * @returns An async generator of events
     */
    invoke(invocationContext: InvocationContext): AsyncGenerator<Event, void, unknown>;
    /**
     * Implementation of the agent's async invocation logic.
     *
     * @param invocationContext The invocation context
     * @returns An async generator of events
     */
    protected abstract runAsyncImpl(invocationContext: InvocationContext): AsyncGenerator<Event, void, unknown>;
    /**
     * Implementation of the agent's live invocation logic.
     *
     * @param invocationContext The invocation context
     * @returns An async generator of events
     */
    protected abstract runLiveImpl(invocationContext: InvocationContext): AsyncGenerator<Event, void, unknown>;
    /**
     * Sets the user content for the agent.
     *
     * @param content The user content
     * @param invocationContext The invocation context
     */
    abstract setUserContent(content: Content, invocationContext: InvocationContext): void;
    /**
     * Gets the root agent of the agent tree.
     *
     * @returns The root agent
     */
    get rootAgent(): BaseAgent;
    /**
     * Finds a sub-agent by name among direct children.
     *
     * @param name The name of the sub-agent to find
     * @returns The sub-agent if found, undefined otherwise
     */
    findSubAgent(name: string): BaseAgent | undefined;
    /**
     * Sets the parent agent of this agent.
     *
     * @param parentAgent The parent agent
     */
    setParentAgent(parentAgent: BaseAgent): void;
    /**
     * Adds a sub-agent to this agent.
     *
     * @param agent The sub-agent to add
     * @returns This agent for method chaining
     */
    addSubAgent(agent: BaseAgent): this;
    /**
     * Creates a new invocation context for this agent.
     *
     * @param parentContext The parent invocation context
     * @returns A new invocation context
     */
    protected createInvocationContext(parentContext: InvocationContext): InvocationContext;
    /**
     * Handles the before-agent callback.
     *
     * @param invocationContext The invocation context
     * @returns The event if the callback returns content, undefined otherwise
     */
    private handleBeforeAgentCallback;
    /**
     * Handles the after-agent callback.
     *
     * @param invocationContext The invocation context
     * @returns The event if the callback returns content, undefined otherwise
     */
    private handleAfterAgentCallback;
}