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import { FC } from 'react';
import { useIntl } from 'react-intl';
import useHeadingsTree, {
type Heading,
} from '../../../utils/hooks/use-headings-tree';
import LinksListWidget, { type LinksListItems } from './links-list-widget';
import styles from './table-of-contents.module.scss';
type TableOfContentsProps = {
/**
* A reference to the HTML element that contains the headings.
*/
wrapper: HTMLElement;
};
/**
* Table of Contents widget component
*
* Render a table of contents.
*/
const TableOfContents: FC<TableOfContentsProps> = ({ wrapper }) => {
const intl = useIntl();
const headingsTree = useHeadingsTree(wrapper);
const title = intl.formatMessage({
defaultMessage: 'Table of Contents',
description: 'TableOfContents: the widget title',
id: 'WKG9wj',
});
/**
* Convert an headings tree to list items.
*
* @param {Heading[]} tree - The headings tree.
* @returns {LinksListItems[]} The list items.
*/
const getItems = (tree: Heading[]): LinksListItems[] => {
return tree.map((heading) => {
return {
name: heading.title,
url: `#${heading.id}`,
child: getItems(heading.children),
};
});
};
return (
<LinksListWidget
kind="ordered"
title={title}
level={2}
items={getItems(headingsTree)}
className={styles.list}
/>
);
};
export default TableOfContents;
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