/* Copyright (c) 2015-present, salesforce.com, inc. All rights reserved */
/* Licensed under BSD 3-Clause - see LICENSE.txt or git.io/sfdc-license */

// # Icon Component

// Based on SLDS v2.1.0-rc.4

// ## Dependencies

// ### React
import React from 'react';
import PropTypes from 'prop-types';

// ### classNames
// [github.com/JedWatson/classnames](https://github.com/JedWatson/classnames)
// A simple javascript utility for conditionally joining classNames together.
import classNames from '../../utilities/class-names';

// ## Children
import UtilityIcon from '../utilities/utility-icon';

// ## Constants
import { ICON } from '../../utilities/constants';

/**
 * The Icon component is the Lightning Design System Icon component and should be used for naked icons. For icons that are buttons, use the <a href='/components/buttons/'>Button component</a> component with <code>variant='icon'</code>.
 */
const Icon = ({
	assistiveText,
	category,
	className,
	containerClassName,
	icon,
	inverse,
	name,
	path,
	size,
	style,
	title
}) => {
	const kababCaseName = name ? name.replace(/_/g, '-') : '';

	return (
		<span
			className={classNames(
				{
					'slds-icon_container': category !== 'utility',
					'slds-icon_container--circle': category === 'action',
					[`slds-icon-${category}-${kababCaseName}`]:
						category !== 'utility' && category !== 'doctype' && !path
				},
				containerClassName
			)}
			title={title}
		>
			<UtilityIcon
				aria-hidden="true"
				category={category}
				className={classNames(className, 'slds-icon', {
					'slds-icon--xx-small': size === 'xx-small',
					'slds-icon--x-small': size === 'x-small',
					'slds-icon--small': size === 'small',
					// medium intentially not present
					'slds-icon--large': size === 'large',
					// if category is `utility` and `inverse` is false (default), icon will be dark // return true
					// if category is `utility` and `inverse` is true, icon will be light // return false
					// if category is NOT `utility` and `inverse` is false (default), icon will be light // return false
					// if category is NOT `utility` and `inverse` is true, icon will be dark // return true
					'slds-icon-text-default': category === 'utility' ? !inverse : inverse
				})}
				icon={icon}
				name={name}
				path={path}
				style={style}
			/>
			{assistiveText ? (
				<span className="slds-assistive-text">{assistiveText}</span>
			) : (
				''
			)}
		</span>
	);
};

// ### Display Name
// Always use the canonical component name as the React display name.
Icon.displayName = ICON;

// ### Prop Types
Icon.propTypes = {
	/**
	 * Text that is visually hidden but read aloud by screenreaders to tell the user what the icon means.
	 * Naked icons must have assistive text, however, if you also have visible descriptive text with the icon,
	 * declare this prop as <code>assistiveText=''</code>.
	 */
	assistiveText: PropTypes.string,
	/**
	 * Icon category from [lightningdesignsystem.com/icons/](https://www.lightningdesignsystem.com/icons/)
	 */
	category: PropTypes.oneOf([
		'action',
		'custom',
		'doctype',
		'standard',
		'utility'
	]).isRequired,
	/**
	 * CSS classes that are applied to the SVG.
	 */
	className: PropTypes.oneOfType([
		PropTypes.array,
		PropTypes.object,
		PropTypes.string
	]),
	/**
	 * CSS classes that are applied to the span.
	 */
	containerClassName: PropTypes.oneOfType([
		PropTypes.array,
		PropTypes.object,
		PropTypes.string
	]),
	/**
	 * Icon color variants
	 */
	colorVariant: PropTypes.oneOf(['base', 'default', 'error', 'warning']),
	/**
	 * A custom SVG object to use instead of the supplied SLDS icons, look in `design-system-react/icons` for examples and syntax.
	 */
	icon: PropTypes.object,
	/**
	 * Setting `inverse` to true will switch the color of the icon: light to dark, dark to light.
	 */
	inverse: PropTypes.bool,
	/**
	 * Name of the icon. Visit <a href='http://www.lightningdesignsystem.com/resources/icons'>Lightning Design System Icons</a> to reference icon names.
	 */
	name: PropTypes.string,
	/**
	 * Path to the icon. This will override any global icon settings
	 */
	path: PropTypes.string,
	/**
	 * Size of the icon. Visit [lightningdesignsystem.com/components/icons/#flavor-sizes](https://www.lightningdesignsystem.com/components/icons/#flavor-sizes)
	 */
	size: PropTypes.oneOf(['xx-small', 'x-small', 'small', 'medium', 'large']),
	/**
	 * Custom styles to be passed to the SVG. Could be used to change icon or background color.
	 */
	style: PropTypes.object,
	/**
	 * Title attribute for the icon container
	 */
	title: PropTypes.string
};

Icon.defaultProps = {
	category: 'standard',
	size: 'medium'
};

export default Icon;