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import Script from 'next/script';
import { FC } from 'react';
import { useIntl } from 'react-intl';
import { BreadcrumbList, ListItem, WithContext } from 'schema-dts';
import { settings } from '../../../utils/config';
import Link from '../../atoms/links/link';
import styles from './breadcrumb.module.scss';
export type BreadcrumbItem = {
/**
* The item id.
*/
id: string;
/**
* The item URL.
*/
url: string;
/**
* The item name.
*/
name: string;
};
export type BreadcrumbProps = {
/**
* Set additional classnames to the nav element.
*/
className?: string;
/**
* Set additional classnames to the breadcrumb items.
*/
itemClassName?: string;
/**
* The breadcrumb items
*/
items: BreadcrumbItem[];
};
/**
* Breadcrumb component
*
* Render a breadcrumb navigation.
*/
const Breadcrumb: FC<BreadcrumbProps> = ({
itemClassName = '',
items,
...props
}) => {
const intl = useIntl();
const ariaLabel = intl.formatMessage({
defaultMessage: 'Breadcrumb',
description: 'Breadcrumb: an accessible name for the breadcrumb nav.',
id: '28nnDY',
});
/**
* Retrieve the breadcrumb list items.
*
* @param {BreadcrumbItem[]} list - The breadcrumb items.
* @returns {JSX.Element[]} The list items.
*/
const getListItems = (list: BreadcrumbItem[]): JSX.Element[] => {
return list.map((item, index) => {
const isLastItem = index === list.length - 1;
const itemStyles = isLastItem
? `${styles.item} screen-reader-text`
: styles.item;
return (
<li key={item.id} className={`${itemStyles} ${itemClassName}`}>
{isLastItem ? item.name : <Link href={item.url}>{item.name}</Link>}
</li>
);
});
};
/**
* Retrieve the breadcrumb list items with Schema.org format.
*
* @param {BreadcrumbItem[]} list - The breadcrumb items.
* @returns {ListItem[]} An array of list items using Schema.org format.
*/
const getSchemaItems = (list: BreadcrumbItem[]): ListItem[] => {
const schemaItems: ListItem[] = [];
list.forEach((item, index) => {
schemaItems.push({
'@type': 'ListItem',
position: index + 1,
name: item.name,
item: item.url,
});
});
return schemaItems;
};
const schemaJsonLd: WithContext<BreadcrumbList> = {
'@context': 'https://schema.org',
'@type': 'BreadcrumbList',
'@id': `${settings.url}/#breadcrumb`,
itemListElement: getSchemaItems(items),
};
return (
<>
<Script
id="schema-breadcrumb"
type="application/ld+json"
dangerouslySetInnerHTML={{ __html: JSON.stringify(schemaJsonLd) }}
/>
<nav aria-label={ariaLabel} {...props}>
<span className="screen-reader-text">
{intl.formatMessage({
defaultMessage: 'You are here:',
description: 'Breadcrumb: You are here prefix',
id: '16zl9Z',
})}
</span>
<ol className={styles.list}>{getListItems(items)}</ol>
</nav>
</>
);
};
export default Breadcrumb;
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