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

// # Global Header Notifications Component
// Implements the [Global Header Notifications design pattern](https://www.lightningdesignsystem.com/components/global-header/#Notifications) in React.

import React from 'react';
import PropTypes from 'prop-types';
import assign from 'lodash.assign';
import Button from '../button';
import Popover from '../popover';

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

const propTypes = {
	/**
	 * **Assistive text for accessibility**
	 * * `newNotificationsAfter`: Assistive text for when there are new notifications, after the notificationCount. The default is ' new notifications'.
	 * * `newNotificationsBefore`: Assistive text for when there are new notifications, before the notificationCount. The default is ''.
	 * * `noNotifications`: Assistive text for when there are no new notifications.
	 */
	assistiveText: PropTypes.shape({
		newNotificationsAfter: PropTypes.string,
		newNotificationsBefore: PropTypes.string,
		noNotifications: PropTypes.string,
	}),
	/**
	 * Dictates the number of notifications shown in the new notifications badge.
	 */
	notificationCount: PropTypes.number,
	/**
	 * A `Popover` component. The props from this popover will be merged and override any default props. The `children` prop will be ignored.
	 */
	popover: PropTypes.node,
};

/**
 * A GlobalHeaderNotifications component. Notifications are a way to notify a user about a global change within the application.
 */
class GlobalHeaderNotifications extends React.Component {
	render() {
		const buttonAriaProps = {
			'aria-live': 'assertive',
		};
		const { notificationCount } = this.props;
		const popoverProps = assign(
			{
				align: 'bottom right',
				body: <span />,
				triggerClassName: 'slds-dropdown-trigger slds-dropdown-trigger_click',
			},
			this.props.popover ? this.props.popover.props : {}
		);
		let notificationsAssistiveText = this.props.assistiveText.noNotifications;

		// eslint-disable-next-line fp/no-delete
		delete popoverProps.children;

		if (notificationCount > 0) {
			notificationsAssistiveText = `${
				this.props.assistiveText.newNotificationsBefore
			}${notificationCount}${this.props.assistiveText.newNotificationsAfter}`;
		} else {
			buttonAriaProps['aria-atomic'] = true;
		}

		return (
			<Popover {...popoverProps}>
				<Button
					assistiveText={{ icon: notificationsAssistiveText }}
					className="slds-button_icon slds-global-actions__notifications slds-global-actions__item-action"
					iconCategory="utility"
					iconClassName="slds-global-header__icon"
					iconName="notification"
					iconSize="small"
					iconVariant="container"
					title={notificationsAssistiveText}
					variant="icon"
					{...buttonAriaProps}
				/>
				{notificationCount > 0 ? (
					<span
						aria-hidden="true"
						className="slds-notification-badge slds-incoming-notification slds-show-notification"
					>
						{notificationCount}
					</span>
				) : (
					<span aria-hidden="true" className="slds-notification-badge" />
				)}
			</Popover>
		);
	}
}

GlobalHeaderNotifications.displayName = GLOBAL_HEADER_NOTIFICATIONS;

GlobalHeaderNotifications.defaultProps = {
	assistiveText: {
		newNotificationsAfter: ' new notifications',
		newNotificationsBefore: '',
		noNotifications: 'No new notifications',
	},
	notificationCount: 0,
};

GlobalHeaderNotifications.propTypes = propTypes;

export default GlobalHeaderNotifications;