/**
 * A2A Adapter — Types (RFC-0069)
 */

// ─── Agent Card ─────────────────────────────────────────────────────────────

export interface AgentCard {
	name: string;
	description: string;
	url: string;
	version: string;
	capabilities: AgentCapabilities;
	skills: Skill[];
	authentication?: Authentication;
	defaultInputModes?: string[];
	defaultOutputModes?: string[];
}

export interface AgentCapabilities {
	streaming?: boolean;
	pushNotifications?: boolean;
	stateTransitionHistory?: boolean;
}

export interface Skill {
	id: string;
	name: string;
	description: string;
	tags?: string[];
	inputModes?: string[];
	outputModes?: string[];
}

export interface Authentication {
	schemes: string[];
	credentials?: string;
}

// ─── Task ─────────────────────────────────────────────────────────────────

export type TaskStatus =
	| "submitted"
	| "working"
	| "completed"
	| "canceled"
	| "failed";

export interface Task {
	id: string;
	sessionId?: string;
	status: TaskStatus;
	artifacts?: Artifact[];
	kind: "message" | "search" | "task";
}

export interface TaskStatusUpdateEvent {
	taskId: string;
	status: TaskStatus;
	message?: TaskMessage;
	final?: boolean;
}

export interface TaskMessage {
	role: "agent" | "user";
	content: string;
}

export interface Artifact {
	name?: string;
	description?: string;
	parts: Array<{ type: "text"; text: string }>;
}

// ─── A2A Requests / Responses ─────────────────────────────────────────────

export type A2ARequest =
	| {
			method: "tasks/send";
			params: { taskId?: string; sessionId?: string; message: TaskMessage };
	  }
	| {
			method: "tasks/sendSubscribe";
			params: { taskId?: string; sessionId?: string; message: TaskMessage };
	  }
	| { method: "tasks/get"; params: { taskId: string } }
	| { method: "tasks/cancel"; params: { taskId: string } }
	| { method: "agents/info"; params: { agentId?: string } }
	| { method: "agents/list"; params?: { filter?: Record<string, string> } };

export interface A2AResponse {
	result?: unknown;
	error?: { code: number; message: string };
}

// ─── A2A Client ─────────────────────────────────────────────────────────

export interface A2AClientConfig {
	timeout?: number;
	headers?: Record<string, string>;
}

export interface TaskHandle {
	taskId: string;
	status: TaskStatus;
}

// ─── A2A Agent ───────────────────────────────────────────────────────────

export interface A2AAgentConfig {
	name: string;
	description: string;
	url: string;
	version: string;
	skills?: Skill[];
	capabilities?: Partial<AgentCapabilities>;
	port?: number;
}