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import Button from '@components/atoms/buttons/button';
import Heading, { type HeadingLevel } from '@components/atoms/headings/heading';
import ProgressBar from '@components/atoms/loaders/progress-bar';
import Spinner from '@components/atoms/loaders/spinner';
import Pagination, {
PaginationProps,
} from '@components/molecules/nav/pagination';
import useIsMounted from '@utils/hooks/use-is-mounted';
import useSettings from '@utils/hooks/use-settings';
import { FC, Fragment, useRef } from 'react';
import { useIntl } from 'react-intl';
import styles from './posts-list.module.scss';
import Summary, { type SummaryProps } from './summary';
export type Post = SummaryProps & {
/**
* The post id.
*/
id: string | number;
};
export type YearCollection = {
[key: string]: Post[];
};
export type PostsListProps = Pick<PaginationProps, 'baseUrl' | 'siblings'> & {
/**
* True to display the posts by year. Default: false.
*/
byYear?: boolean;
/**
* Determine if the data is loading.
*/
isLoading?: boolean;
/**
* Load more button handler.
*/
loadMore?: () => void;
/**
* The current page number. Default: 1.
*/
pageNumber?: number;
/**
* The posts data.
*/
posts: Post[];
/**
* Determine if the load more button should be visible.
*/
showLoadMoreBtn?: boolean;
/**
* The posts heading level (hn).
*/
titleLevel?: HeadingLevel;
/**
* The total posts number.
*/
total: number;
};
/**
* Create a collection of posts sorted by year.
*
* @param {Posts[]} data - A collection of posts.
* @returns {YearCollection} The posts sorted by year.
*/
const sortPostsByYear = (data: Post[]): YearCollection => {
const yearCollection: YearCollection = {};
data.forEach((post) => {
const postYear = new Date(post.meta.dates.publication)
.getFullYear()
.toString();
yearCollection[postYear] = [...(yearCollection[postYear] || []), post];
});
return yearCollection;
};
/**
* PostsList component
*
* Render a list of post summaries.
*/
const PostsList: FC<PostsListProps> = ({
baseUrl,
byYear = false,
isLoading = false,
loadMore,
pageNumber = 1,
posts,
showLoadMoreBtn = false,
siblings,
titleLevel,
total,
}) => {
const intl = useIntl();
const listRef = useRef<HTMLOListElement>(null);
const lastPostRef = useRef<HTMLSpanElement>(null);
const isMounted = useIsMounted(listRef);
const { blog } = useSettings();
const lastPostId = posts.length ? posts[posts.length - 1].id : 0;
/**
* Retrieve the list of posts.
*
* @param {Posts[]} allPosts - A collection fo posts.
* @param {HeadingLevel} [headingLevel] - The posts heading level (hn).
* @returns {JSX.Element} The list of posts.
*/
const getList = (
allPosts: Post[],
headingLevel: HeadingLevel = 2
): JSX.Element => {
return (
<ol className={styles.list} ref={listRef}>
{allPosts.map(({ id, ...post }) => (
<Fragment key={id}>
<li className={styles.item}>
<Summary {...post} titleLevel={headingLevel} />
</li>
{id === lastPostId && (
<li>
<span ref={lastPostRef} tabIndex={-1} />
</li>
)}
</Fragment>
))}
</ol>
);
};
/**
* Retrieve the list of posts.
*
* @returns {JSX.Element | JSX.Element[]} The posts list.
*/
const getPosts = (): JSX.Element | JSX.Element[] => {
const firstLevel = titleLevel || 2;
if (!byYear) return getList(posts, firstLevel);
const postsPerYear = sortPostsByYear(posts);
const years = Object.keys(postsPerYear).reverse();
const nextLevel = (firstLevel + 1) as HeadingLevel;
return years.map((year) => {
return (
<section key={year} className={styles.section}>
<Heading level={firstLevel} className={styles.year}>
{year}
</Heading>
{getList(postsPerYear[year], nextLevel)}
</section>
);
});
};
const progressInfo = intl.formatMessage(
{
defaultMessage:
'{articlesCount, plural, =0 {# loaded articles} one {# loaded article} other {# loaded articles}} out of a total of {total}',
description: 'PostsList: loaded articles progress',
id: '9MeLN3',
},
{ articlesCount: posts.length, total: total }
);
const loadMoreBody = intl.formatMessage({
defaultMessage: 'Load more articles?',
id: 'uaqd5F',
description: 'PostsList: load more button',
});
/**
* Load more posts handler.
*/
const loadMorePosts = () => {
if (lastPostRef.current) {
lastPostRef.current.focus();
}
loadMore && loadMore();
};
const getProgressBar = () => {
return (
<>
<ProgressBar
min={1}
max={total}
current={posts.length}
info={progressInfo}
/>
{showLoadMoreBtn && (
<Button
kind="tertiary"
onClick={loadMorePosts}
disabled={isLoading}
className={styles.btn}
>
{loadMoreBody}
</Button>
)}
</>
);
};
const getPagination = () => {
return posts.length <= blog.postsPerPage ? (
<Pagination
baseUrl={baseUrl}
current={pageNumber}
perPage={blog.postsPerPage}
siblings={siblings}
total={total}
/>
) : (
<></>
);
};
if (posts.length === 0) {
return (
<p>
{intl.formatMessage({
defaultMessage: 'No results found.',
description: 'PostsList: no results',
id: 'vK7Sxv',
})}
</p>
);
}
return (
<>
{getPosts()}
{isLoading && <Spinner />}
{isMounted ? getProgressBar() : getPagination()}
</>
);
};
export default PostsList;
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