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

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

const { number, string, oneOf, object } = PropTypes;

/**
 * {"categories": ["visualizations", "chart primitives"]}
 *
 * *For use within an `svg`*
 *
 * Centered labels for axes that typically are fit into the margins of a chart.
 */
const AxisLabel = createClass({
	displayName: 'AxisLabel',

	propTypes: {
		/**
		 * Passed through to the root element.
		 */
		style: object,
		/**
		 * Appended to the component-specific class names set on the root element.
		 */
		className: string,
		/**
		 * Height of the margin this label should fit into.
		 */
		height: number.isRequired,
		/**
		 * Width of the margin this label should fit into.
		 */
		width: number.isRequired,
		/**
		 * Strings should match an existing color class unless they start with a
		 * '#' for specific colors. E.g.:
		 *
		 * - `COLOR_0`
		 * - `COLOR_GOOD`
		 * - `'#123abc'`
		 */
		color: string,
		/**
		 * Contents of the label, should only ever be a string since we use a `text`
		 * under the hood.
		 */
		label: string,
		/**
		 * Determine orientation of the label.
		 */
		orient: oneOf(['top', 'bottom', 'left', 'right']),
	},

	getDefaultProps() {
		return {
			color: '#000',
		};
	},

	render() {
		const {
			height,
			width,
			orient,
			label,
			color,
			style,
			className,
			...passThroughs
		} = this.props;

		const isH = orient === 'top' || orient === 'bottom';
		const isCustomColor = _.startsWith(color, '#');
		const colorStyle = isCustomColor ? { fill: color } : null;

		return (
			<text
				{...omitProps(passThroughs, AxisLabel)}
				style={{
					...colorStyle,
					...style,
				}}
				className={cx(className, '&', {
					[`&-${color}`]: !isCustomColor,
				})}
				x={isH ? width / 2 : height / 2 * -1}
				y={orient === 'right' ? width : orient === 'bottom' ? height : 0}
				dy={orient === 'top' || orient === 'left' ? '1em' : '-.32em'}
				transform={isH ? '' : 'rotate(-90)'}
			>
				{label}
			</text>
		);
	},
});

export default AxisLabel;