/**
 * External dependencies
 */
import apiFetch from '../../api-fetch/index.ts';
/**
 * Types
 */

const MAX_CONCURRENT_REQUESTS = 5;

let concurrentCounter = 0;

/**
 * Concurrency-limited request to wpcom-proxy-request.
 * @param { object } params - The request params, as expected by apiFetch.
 * @return { Promise }                   The response.
 * @throws { Error }                      If there are too many concurrent requests.
 */
export default async function wpcomLimitedRequest< T >( params: object ): Promise< T > {
	concurrentCounter += 1;

	if ( concurrentCounter > MAX_CONCURRENT_REQUESTS ) {
		concurrentCounter -= 1;
		throw new Error( 'Too many requests' );
	}

	return apiFetch( params ).finally( () => {
		concurrentCounter -= 1;
	} ) as Promise< T >;
}