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

// # List Component

// ## Dependencies

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

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

// ## Children
import ListItem from './item';

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

/**
 * Component description.
 */
const List = createReactClass({
	displayName: LIST,

	propTypes: {
		/**
		 * Determines whether or not to show a checkmark for selected items.
		 */
		checkmark: PropTypes.bool,
		/**
		 * CSS classes to be added to `<ul />`.
		 */
		className: PropTypes.string,
		/**
		 * Used internally to determine the id that will be used for list items.
		 */
		getListItemId: PropTypes.func,
		/**
		 * Used internally to pass references to the individual menu items back up for focusing / scrolling.
		 */
		itemRefs: PropTypes.func,
		/**
		 * If provided, this function will be used to render the contents of each menu item.
		 */
		itemRenderer: PropTypes.func,
		/**
		 * Sets the height of the list based on the numeber of items.
		 */
		length: PropTypes.oneOf([null, '5', '7', '10']),
		/**
		 * Triggered when a list item is selected (via mouse or keyboard).
		 */
		onSelect: PropTypes.func,
		/**
		 * An array of items to render in the list.
		 */
		options: PropTypes.array,
		/**
		 * The index of the currently selected item in the list.
		 */
		selectedIndex: PropTypes.number,
		/**
		 * The id of the element which triggered this list (in a menu context).
		 */
		triggerId: PropTypes.string,
	},

	getDefaultProps () {
		return {
			length: '5',
			options: [],
			selectedIndex: -1,
		};
	},

	render () {
		let lengthClassName;
		if (this.props.length) {
			lengthClassName = `slds-dropdown--length-${this.props.length}`;
		}
		return (
			<ul
				aria-labelledby={this.props.triggerId}
				className={classNames(
					'dropdown__list',
					lengthClassName,
					this.props.className
				)}
				role="menu"
			>
				{this.props.options.map((option, index) => {
					const id = this.props.getListItemId(index);
					const isSingleSelected = index === this.props.selectedIndex;
					const isMultipleSelected =
						!!this.props.selectedIndices &&
						this.props.selectedIndices.indexOf(index) !== -1;
					return (
						<ListItem
							{...option}
							aria-disabled={option.disabled}
							checkmark={
								this.props.checkmark && (isSingleSelected || isMultipleSelected)
							}
							data={option}
							id={id}
							index={index}
							isSelected={isSingleSelected || isMultipleSelected}
							key={`${id}-${option.value}`}
							labelRenderer={this.props.itemRenderer}
							onSelect={this.props.onSelect}
							ref={(listItem) => this.props.itemRefs(listItem, index)}
						/>
					);
				})}
			</ul>
		);
	},
});

export default List;