wp-calypso/client/my-sites/subscribers/components/subscribers-header-popover/subscribers-header-popover.tsx

import { Icon, Button } from '@wordpress/components';
import { moreVertical } from '@wordpress/icons';
import clsx from 'clsx';
import { translate } from 'i18n-calypso';
import { useCallback, useRef, useState } from 'react';
import { useDispatch } from 'react-redux';
import PopoverMenu from 'calypso/components/popover-menu';
import PopoverMenuItem from 'calypso/components/popover-menu/item';
import { addQueryArgs } from 'calypso/lib/url';
import { useSelector } from 'calypso/state';
import { recordGoogleEvent } from 'calypso/state/analytics/actions';
import { getCurrentUserSiteCount } from 'calypso/state/current-user/selectors';
import useSubscriberCountQuery from '../../queries/use-subscriber-count-query';
import { useRecordExport } from '../../tracks';

import '../shared/popover-style.scss';

type SubscribersHeaderPopoverProps = {
	siteId: number | null;
	openMigrateSubscribersModal: () => void;
};

const SubscribersHeaderPopover = ( {
	siteId,
	openMigrateSubscribersModal,
}: SubscribersHeaderPopoverProps ) => {
	const [ isVisible, setIsVisible ] = useState( false );
	const dispatch = useDispatch();
	const onToggle = useCallback( () => setIsVisible( ( visible ) => ! visible ), [] );
	const buttonRef = useRef< HTMLButtonElement >( null );
	const downloadCsvLink = addQueryArgs(
		{ page: 'subscribers', blog: siteId, blog_subscribers: 'csv', type: 'all' },
		'https://dashboard.wordpress.com/wp-admin/index.php'
	);
	const { data: subscribersTotals } = useSubscriberCountQuery( siteId );
	const hasSubscribers = !! subscribersTotals?.total_subscribers;
	const recordExport = useRecordExport();
	const currentUserSiteCount = useSelector( getCurrentUserSiteCount );

	const onDownloadCsvClick = () => {
		dispatch(
			recordGoogleEvent(
				'Subscribers',
				'Clicked Download email subscribers as CSV menu item on Subscribers'
			)
		);
		recordExport();
	};

	const hasMultipleSites = currentUserSiteCount && currentUserSiteCount > 1;

	// No point showing the dropdown if they don't have subscribers or sites
	if ( ! hasSubscribers && ! hasMultipleSites ) {
		return null;
	}

	return (
		<div>
			<Button
				className={ clsx( 'subscriber-popover__toggle', {
					'is-popover-visible': isVisible,
				} ) }
				onClick={ onToggle }
				ref={ buttonRef }
				icon={ <Icon icon={ moreVertical } size={ 18 } /> }
				size="compact"
			/>

			<PopoverMenu
				position="bottom left"
				onClose={ () => setIsVisible( false ) }
				isVisible={ isVisible }
				context={ buttonRef.current }
				className="subscriber-popover"
			>
				{ hasSubscribers ? (
					<PopoverMenuItem href={ downloadCsvLink } onClick={ onDownloadCsvClick }>
						{ translate( 'Download subscribers as CSV' ) }
					</PopoverMenuItem>
				) : null }
				{ hasMultipleSites ? (
					<PopoverMenuItem onClick={ openMigrateSubscribersModal }>
						{ translate( 'Migrate subscribers from another WordPress.com site' ) }
					</PopoverMenuItem>
				) : null }
			</PopoverMenu>
		</div>
	);
};

export default SubscribersHeaderPopover;