import * as React from 'react';

export interface IClickOutsideProps {
	onClick: () => void;
	/** element to add the click event listener, default selector is body */
	parentTargetQuerySelector?: string;
}

/**
 * Function Component to re-use the behavior of click outside
 *
 * expects to have a children and a defined onClick callback
 */
const ClickOutside: React.FunctionComponent<IClickOutsideProps> = ({
	parentTargetQuerySelector = 'body',
	children,
	onClick
}) => {
	const refs = React.Children.map(children, () => React.useRef<any>(null));

	const appElement = window.document.querySelector(parentTargetQuerySelector) || window.document;

	const handleClick = React.useCallback(
		(e: Event) => {
			const isOutside = refs.every(ref => {
				if (!ref.current) {
					return false;
				}
				return !ref.current!.contains(e.target);
			});

			if (isOutside) {
				onClick();
			}
		},
		[onClick]
	);

	React.useEffect(() => {
		appElement.addEventListener('click', handleClick);
		return () => appElement.removeEventListener('click', handleClick);
	}, [handleClick]);

	return <>{React.Children.map(children, (element: any, idx) => React.cloneElement(element, { ref: refs[idx] }))}</>;
};

export default ClickOutside;