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

// Implements the [Button Stateful design pattern](https://lightningdesignsystem.com/components/buttons/#flavor-stateful) in React.
// Based on SLDS v2.1.1

// ## Dependencies

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

// ### classNames
import classNames from 'classnames';

// ### isBoolean
import isBoolean from 'lodash.isboolean';

// ### isFunction
import isFunction from 'lodash.isfunction';

// ## Children
import ButtonIcon from '../icon/button-icon';

import { BUTTON_STATEFUL } from '../../utilities/constants';

const propTypes = {
	/**
	 * Specifies the current state of the button. If set, the button will act as a ['controlled' component](https://facebook.github.io/react/docs/forms.html#controlled-components).
	 */
	active: PropTypes.bool,
	/**
	 * Text that is visually hidden but read aloud by screenreaders to tell the user what the icon means. This should also include the state of the button.
	 * If the button has an icon and a visible label, you can omit the <code>assistiveText</code> prop and use the <code>label</code> prop.
	 */
	assistiveText: PropTypes.string,
	/**
	 * Disables the button and adds disabled styling.
	 */
	disabled: PropTypes.bool,
	/**
	 * Name of the icon. Visit <a href='http://www.lightningdesignsystem.com/resources/icons'>Lightning Design System Icons</a> to reference icon names.
	 */
	iconName: PropTypes.string,
	/**
	 * Determines the size of the icon.
	 */
	iconSize: PropTypes.oneOf(['x-small', 'small', 'medium', 'large']),
	/**
	 * If true, button/icon is white. Meant for buttons or utility icons on dark backgrounds.
	 */
	inverse: PropTypes.bool,
	/**
	 * Triggered when focus is removed.
	 */
	onBlur: PropTypes.func,
	/**
	 * Triggered when the button is clicked.
	 */
	onClick: PropTypes.func,
	/**
	 * Triggered when component is focused.
	 */
	onFocus: PropTypes.func,
	/**
	 * Triggered when a key is pressed down
	 */
	onKeyDown: PropTypes.func,
	/**
	 * Triggered when a key is pressed and released
	 */
	onKeyPress: PropTypes.func,
	/**
	 * Triggered when a key is released
	 */
	onKeyUp: PropTypes.func,
	/**
	 * Triggered when a mouse button is pressed down
	 */
	onMouseDown: PropTypes.func,
	/**
	 * Triggered when a mouse arrow hovers
	 */
	onMouseEnter: PropTypes.func,
	/**
	 * Triggered when a mouse arrow no longer hovers
	 */
	onMouseLeave: PropTypes.func,
	/**
	 * If true, button scales to 100% width on small form factors.
	 */
	responsive: PropTypes.bool,
	/**
	 * Initial label and icon (optional) of button.
	 */
	stateOne: PropTypes.object,
	/**
	 * Selected label and icon (optional) of button.
	 */
	stateTwo: PropTypes.object,
	/**
	 * Deselect label and icon (optional) of button.
	 */
	stateThree: PropTypes.object,
	/**
	 * Write "-1" if you don't want the user to tab to the button.
	 */
	tabIndex: PropTypes.string,
	/**
	 * [Deprecated] Tooltip on button. Button should be a child of `Tooltip` instead.
	 */
	tooltip: PropTypes.node,
	/**
	 * Different types of buttons
	 */
	variant: PropTypes.oneOf(['base', 'neutral', 'brand', 'destructive', 'icon']),
};

// i18n
const defaultProps = {
	disabled: false,
	iconSize: 'medium',
	responsive: false,
	stateOne: { iconName: 'add', label: 'Follow' },
	stateTwo: { iconName: 'check', label: 'Following' },
	stateThree: { iconName: 'close', label: 'Unfollow' },
};

/**
 * The ButtonStateful component is a variant of the Lightning Design System Button component. It is used for buttons that have a state of unselected or selected.
 * For icon buttons, use <code>variant='icon'</code>. For buttons with labels or buttons with labels and icons, pass data to the state props (ie. <code>stateOne={{iconName: 'add', label: 'Join'}}</code>).
 */
class ButtonStateful extends React.Component {
	constructor (props) {
		super(props);
		this.state = { active: false };
	}

	getClassName (active) {
		return classNames(this.props.className, 'slds-button', {
			'slds-button--neutral': this.props.variant !== 'icon',
			'slds-button--inverse': this.props.variant === 'inverse',
			'slds-not-selected': !active,
			'slds-is-selected': active,
			'slds-max-small-button--stretch': this.props.responsive,
			'slds-button--icon-border': this.props.variant === 'icon',
		});
	}

	handleBlur = (e) => {
		if (this.props.onBlur) this.props.onBlur(e);
		e.currentTarget.blur();
	};

	handleClick = (e) => {
		if (isFunction(this.props.onClick)) this.props.onClick(e);
		if (!isBoolean(this.props.active)) {
			this.setState({ active: !this.state.active });
		}
	};

	render () {
		const {
			active,
			assistiveText,
			disabled,
			iconName,
			iconSize,
			id,
			onFocus,
			onKeyDown,
			onKeyPress,
			onKeyUp,
			onMouseDown,
			onMouseEnter,
			// onMouseLeave,  // This prop isn't used anywhere! But removing it would be a breaking change
			stateOne,
			stateTwo,
			stateThree,
			tabIndex,
			variant,
		} = this.props;

		const isActive = isBoolean(active) ? active : this.state.active;

		if (variant === 'icon') {
			return (
				<button
					aria-live="polite"
					className={this.getClassName(isActive)}
					disabled={disabled}
					id={id}
					onBlur={this.handleBlur}
					onClick={this.handleClick}
					onFocus={onFocus}
					onKeyDown={onKeyDown}
					onKeyPress={onKeyPress}
					onKeyUp={onKeyUp}
					onMouseDown={onMouseDown}
					onMouseEnter={onMouseEnter}
					onMouseLeave={this.handleBlur}
					tabIndex={tabIndex}
				>
					<ButtonIcon
						disabled={disabled}
						name={iconName}
						size={iconSize}
						className="slds-button__icon--stateful"
					/>
					{assistiveText ? (
						<span className="slds-assistive-text">{assistiveText}</span>
					) : null}
				</button>
			);
		}

		return (
			<button
				aria-live="assertive"
				className={this.getClassName(isActive)}
				disabled={disabled}
				id={id}
				onBlur={this.handleBlur}
				onClick={this.handleClick}
				onFocus={onFocus}
				onKeyDown={onKeyDown}
				onKeyPress={onKeyPress}
				onKeyUp={onKeyUp}
				onMouseEnter={onMouseEnter}
				onMouseLeave={this.handleBlur}
				tabIndex={tabIndex}
			>
				<span className="slds-text-not-selected">
					<ButtonIcon
						disabled={disabled}
						name={stateOne.iconName}
						size="small"
						position="left"
						className="slds-button__icon--stateful"
					/>
					{stateOne.label}
				</span>
				<span className="slds-text-selected">
					<ButtonIcon
						disabled={disabled}
						name={stateTwo.iconName}
						size="small"
						position="left"
						className="slds-button__icon--stateful"
					/>
					{stateTwo.label}
				</span>
				<span className="slds-text-selected-focus">
					<ButtonIcon
						disabled={disabled}
						name={stateThree.iconName}
						size="small"
						position="left"
						className="slds-button__icon--stateful"
					/>
					{stateThree.label}
				</span>
			</button>
		);
	}
}

ButtonStateful.displayName = BUTTON_STATEFUL;
ButtonStateful.propTypes = propTypes;
ButtonStateful.defaultProps = defaultProps;

export default ButtonStateful;