import type { Hooks, StoreKey } from './types';

/**
 * Returns whether a hook is currently being executed.
 *
 */
export type DoingHook = (
	/**
	 * The name of the hook to check for.
	 * If omitted, will check for any hook being executed.
	 */ hookName?: string
) => boolean;

/**
 * Returns a function which, when invoked, will return whether a hook is
 * currently being executed.
 *
 * @param hooks    Hooks instance.
 * @param storeKey
 *
 * @return Function that returns whether a hook is currently
 *                     being executed.
 */
function createDoingHook( hooks: Hooks, storeKey: StoreKey ): DoingHook {
	return function doingHook( hookName ) {
		const hooksStore = hooks[ storeKey ];

		// If the hookName was not passed, check for any current hook.
		if ( 'undefined' === typeof hookName ) {
			return hooksStore.__current.size > 0;
		}

		// Find if the `hookName` hook is in `__current`.
		return Array.from( hooksStore.__current ).some(
			( hook ) => hook.name === hookName
		);
	};
}

export default createDoingHook;