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import clsx from 'clsx';
import { useTranslate } from 'i18n-calypso';
import StatsHeroCard from './stats-hero-card';
import type { StatsCardProps } from './types';

import './stats-card.scss';

const BASE_CLASS_NAME = 'stats-card';

const StatsCard = ( props: StatsCardProps ) => {
	const translate = useTranslate();
	const { heroElement, splitHeader, toggleControl } = props;

	// Isolate the rendering logic for the Locations module into a new component.
	// This ensures the existing StatsCard component remains unchanged, allowing us to safely iterate on it.
	if ( heroElement && splitHeader && toggleControl ) {
		return <StatsHeroCard { ...props } />;
	}

	const {
		children,
		className,
		title,
		titleURL,
		titleAriaLevel = 4,
		titleNodes,
		downloadCsv,
		footerAction,
		isEmpty,
		emptyMessage,
		multiHeader,
		metricLabel,
		mainItemLabel,
		additionalHeaderColumns,
		headerClassName,
		overlay,
	} = props;

	const titleNode = titleURL ? (
		<a href={ `${ titleURL }` } className={ `${ BASE_CLASS_NAME }-header__title` }>
			{ title }
		</a>
	) : (
		<div
			className={ `${ BASE_CLASS_NAME }-header__title` }
			role="heading"
			aria-level={ titleAriaLevel }
		>
			<div>{ title }</div>
			<div className={ `${ BASE_CLASS_NAME }-header__title-nodes` }>{ titleNodes }</div>
		</div>
	);

	// On one line shows card title and value column header
	const simpleHeaderNode = (
		<div className={ clsx( `${ BASE_CLASS_NAME }-header`, headerClassName ) }>
			{ titleNode }
			{ ! isEmpty && <div>{ metricLabel ?? translate( 'Views' ) }</div> }
		</div>
	);

	// Show card title and download csv button on one line, description and metric label on another:
	const multiHeaderNode = (
		<>
			<div className={ clsx( `${ BASE_CLASS_NAME }-header`, headerClassName ) }>
				{ titleNode }
				{ ! isEmpty && downloadCsv }
			</div>
			{ ! isEmpty && (
				<div className={ clsx( `${ BASE_CLASS_NAME }-sub-header`, headerClassName ) }>
					<div> All { title.toLowerCase() } </div>
					<div>{ metricLabel ?? translate( 'Views' ) }</div>
				</div>
			) }
		</>
	);

	// Show Card title on one line and all other column header(s) below:
	// (main item, optional additional columns and value)
	const splitHeaderNode = (
		<div
			className={ clsx(
				`${ BASE_CLASS_NAME }-header`,
				headerClassName,
				`${ BASE_CLASS_NAME }-header--split`
			) }
		>
			<div className={ `${ BASE_CLASS_NAME }-header--main` }>
				<div className={ `${ BASE_CLASS_NAME }-header--main__left` }>
					{ ! heroElement && titleNode }
					{ downloadCsv }
				</div>
				<div className={ `${ BASE_CLASS_NAME }-header--main__right` }>{ toggleControl }</div>
			</div>
			{ ! isEmpty && (
				<div className={ `${ BASE_CLASS_NAME }--column-header` }>
					<div className={ `${ BASE_CLASS_NAME }--column-header__left` } key="left">
						{ splitHeader && mainItemLabel }
						{ additionalHeaderColumns && (
							<div className={ `${ BASE_CLASS_NAME }-header__additional` }>
								{ additionalHeaderColumns }
							</div>
						) }
					</div>
					{ ! isEmpty && (
						<div className={ `${ BASE_CLASS_NAME }--column-header__right` } key="right">
							{ metricLabel ?? translate( 'Views' ) }
						</div>
					) }
				</div>
			) }
		</div>
	);

	const getHeaderNode = () => {
		if ( multiHeader ) {
			return multiHeaderNode;
		}
		if ( splitHeader ) {
			return splitHeaderNode;
		}
		return simpleHeaderNode;
	};

	return (
		<div
			className={ clsx( className, BASE_CLASS_NAME, {
				[ `${ BASE_CLASS_NAME }__hasoverlay` ]: !! overlay,
			} ) }
		>
			<div
				className={ `${ BASE_CLASS_NAME }__content` }
				{ ...( overlay && { 'aria-hidden': true, inert: '' } ) }
			>
				{ !! heroElement && (
					<div className={ `${ BASE_CLASS_NAME }--hero` }>
						{ splitHeader && (
							<div className={ clsx( `${ BASE_CLASS_NAME }-header`, headerClassName ) }>
								{ titleNode }
							</div>
						) }
						{ heroElement }
					</div>
				) }
				<div className={ `${ BASE_CLASS_NAME }--header-and-body` }>
					{ getHeaderNode() }
					<div
						className={ clsx( `${ BASE_CLASS_NAME }--body`, {
							[ `${ BASE_CLASS_NAME }--body-empty` ]: isEmpty,
						} ) }
					>
						{ isEmpty ? emptyMessage : children }
					</div>
				</div>
				{ footerAction && (
					<a
						className={ `${ BASE_CLASS_NAME }--footer` }
						href={ footerAction?.url }
						aria-label={
							translate( 'View all %(title)s', {
								args: { title: title.toLocaleLowerCase?.() ?? title.toLowerCase() },
								comment: '"View all posts & pages", "View all referrers", etc.',
							} ) as string
						}
					>
						{ footerAction.label || translate( 'View all' ) }
					</a>
				) }
			</div>
			{ overlay && <div className={ `${ BASE_CLASS_NAME }__overlay` }>{ overlay }</div> }
		</div>
	);
};

export default StatsCard;