import React from 'react';
import PropTypes from 'prop-types';
import { lucidClassNames } from '../../util/style-helpers';
import { createClass, getFirst, omitProps } from '../../util/component-types';
import _ from 'lodash';

const cx = lucidClassNames.bind('&-Validation');

const { any } = PropTypes;

/**
 *
 * {"categories": ["helpers"]}
 *
 * Validation is a wrapper component that's meant to be used by other
 * components. Wrap your form components in it and style them accordingly if
 * there's an error.
 */
const Validation = createClass({
	displayName: 'Validation',

	components: {
		/**
		 * Content that will be displayed as an error message.
		 */
		Error: createClass({
			displayName: 'Validation.Error',
			propName: 'Error',
		}),
	},

	propTypes: {
		/**
		 * In most cases this will be a string, but it also accepts any valid React
		 * element. If this is a falsey value, then no error message will be
		 * displayed.
		 *
		 * If this is the literal `true`, it will add the `-is-error` class to the
		 * wrapper div, but not render the `-error-content` `div`.
		 */
		Error: any,

		/**
		 * Classes that are appended to the component defaults. This prop is run
		 * through the `classnames` library.
		 */
		className: any,

		/**
		 * Any valid React children.
		 */
		children: any.isRequired,
	},

	render() {
		const { className, children, ...passThroughs } = this.props;

		const errorChildProps = _.get(
			getFirst(this.props, Validation.Error),
			'props'
		);

		return (
			<div
				{...omitProps(passThroughs, Validation)}
				className={cx(
					'&',
					{
						'&-is-error': errorChildProps && errorChildProps.children,
					},
					className
				)}
			>
				{children}
				{errorChildProps &&
					errorChildProps.children &&
					errorChildProps.children !== true
					? <div
							{...omitProps(errorChildProps, Validation.Error)}
							className={cx('&-error-content', errorChildProps.className)}
						>
							{errorChildProps.children}
						</div>
					: null}
			</div>
		);
	},
});

export default Validation;