import type { IDataObject, IExecuteFunctions, ILoadOptionsFunctions, INode } from 'n8n-workflow';
import { NodeOperationError } from 'n8n-workflow';

import type { AgentParametersInput, AgentResultResponse, AirtopAgentResponse } from './agent.types';
import { AIRTOP_HOOKS_BASE_URL, BASE_URL_V2, ERROR_MESSAGES } from '../../constants';
import { apiRequest } from '../../transport';

/**
 * Gets the agent input parameters schema.
 */
export async function getAgentDetails(
	this: IExecuteFunctions | ILoadOptionsFunctions,
	agentId: string,
): Promise<AirtopAgentResponse> {
	return await apiRequest.call<
		IExecuteFunctions | ILoadOptionsFunctions,
		['GET', string],
		Promise<AirtopAgentResponse>
	>(this, 'GET', `${BASE_URL_V2}/agents/${agentId}`);
}

/**
 * Validates the agent parameters with the schema.
 */
export function validateAgentParameters(
	this: IExecuteFunctions,
	params: AgentParametersInput,
): IDataObject {
	const inputParameters = params?.value ?? {};
	const requiredParameters = (params?.schema ?? [])
		.filter((field) => field.required)
		.map((field) => field.id);
	// check for empty values on required fields
	const missingRequiredParameters = requiredParameters.filter((reqParam) => {
		return (
			inputParameters[reqParam] === undefined ||
			inputParameters[reqParam] === null ||
			inputParameters[reqParam] === ''
		);
	});
	if (missingRequiredParameters.length) {
		throw new NodeOperationError(
			this.getNode(),
			`Missing required parameters: ${missingRequiredParameters.join(', ')}`,
		);
	}

	return { configVars: inputParameters };
}

/**
 * Gets the agent status
 */
export async function getAgentStatus(
	this: IExecuteFunctions,
	agentId: string,
	invocationId: string,
): Promise<AgentResultResponse> {
	const resultUrl = `${AIRTOP_HOOKS_BASE_URL}/agents/${agentId}/invocations/${invocationId}/result`;
	return await apiRequest.call<IExecuteFunctions, ['GET', string], Promise<AgentResultResponse>>(
		this,
		'GET',
		resultUrl,
	);
}

/**
 * Polls the agent execution status until it's completed or fails.
 */
export async function pollAgentStatus(
	this: IExecuteFunctions,
	agentId: string,
	invocationId: string,
	timeoutSeconds: number,
): Promise<AgentResultResponse | undefined> {
	const airtopNode = this.getNode();
	const startTime = Date.now();
	const timeoutMs = timeoutSeconds * 1000;
	let response: AgentResultResponse | undefined;

	this.logger.info(`[${airtopNode.name}] Polling agent status for invocationId: ${invocationId}`);

	while (true) {
		const elapsed = Date.now() - startTime;
		throwOperationErrorIf(elapsed >= timeoutMs, ERROR_MESSAGES.TIMEOUT_REACHED, airtopNode);

		response = await getAgentStatus.call(this, agentId, invocationId);

		if (response?.output || response?.error) {
			return response;
		}

		// Wait one second before next poll
		await new Promise((resolve) => setTimeout(resolve, 1000));
	}
}

/**
 * Throws an operation error if the statement is true.
 */
export function throwOperationErrorIf(statement: boolean, message: string, node: INode) {
	if (statement) {
		throw new NodeOperationError(node, message);
	}
}