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

// # Global Navigation Bar Component

// Implements the [Global Navigation Bar design pattern](https://www.lightningdesignsystem.com/components/global-navigation#flavor-navigation-bar) in React.
// Based on SLDS v2.1.0-rc.2

// ## Dependencies

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

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

// ## Constants
import {
	GLOBAL_NAVIGATION_BAR,
	GLOBAL_NAVIGATION_BAR_REGION,
} from '../../utilities/constants';

const auditChildren = (children) => {
	let primaryRegion;
	// there can be multiple secondary navigation regions
	const secondaryRegions = [];
	let tertiaryRegion;

	React.Children.forEach(children, (child) => {
		if (child && child.type.displayName === GLOBAL_NAVIGATION_BAR_REGION) {
			if (child.props.region === 'primary') {
				primaryRegion = child;
			} else if (child.props.region === 'secondary') {
				// eslint-disable-next-line fp/no-mutating-methods
				secondaryRegions.push(child);
			} else if (child.props.region === 'tertiary') {
				tertiaryRegion = child;
			}
		}
	});

	return [primaryRegion, ...secondaryRegions, tertiaryRegion];
};

/**
 * Global Navigation Bar represents a list of links that either take the user to another page or parts of the page the user is in.
 */
const GlobalNavigationBar = (props) => (
	<div
		className={classNames(
			'slds-context-bar',
			{
				[`slds-context-bar_theme-${props.cloud}`]: props.cloud,
				[`slds-context-bar_theme-${props.theme}`]: props.theme,
			},
			props.className
		)}
	>
		{auditChildren(props.children)}
	</div>
);

// ### Prop Types
GlobalNavigationBar.propTypes = {
	/**
	 * The items to be displayed in the Global Navigation Bar.
	 */
	children: PropTypes.node,
	/**
	 * CSS class names to be added to the container element.
	 */
	className: PropTypes.oneOfType([
		PropTypes.array,
		PropTypes.object,
		PropTypes.string,
	]),
	/**
	 * Typically the cloud name (e.g.- "sales" or "marketing"). This primarily changes the background color.
	 */
	cloud: PropTypes.string,
	/**
	 * Transforms text and interactions (such as hover) to be more visually accessible.
	 */
	theme: PropTypes.oneOf(['light', 'dark']),
};

GlobalNavigationBar.defaultProps = {};

GlobalNavigationBar.displayName = GLOBAL_NAVIGATION_BAR;

export default GlobalNavigationBar;