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import {
type ForwardRefRenderFunction,
type HTMLAttributes,
forwardRef,
useCallback,
useRef,
type RefCallback,
} from 'react';
import { useIntl } from 'react-intl';
import { mergeRefs } from '../../../utils/helpers';
import {
Heading,
type HeadingLevel,
List,
ListItem,
Button,
ProgressBar,
} from '../../atoms';
import {
PostPreview,
type PostPreviewMetaData,
type PostPreviewProps,
} from '../post-preview';
import styles from './posts-list.module.scss';
const MAX_HEADING_LVL = 6;
export type PostData = Pick<
PostPreviewProps,
'cover' | 'excerpt' | 'heading' | 'url'
> & {
/**
* The post id.
*/
id: string | number;
/**
* The post meta.
*/
meta: PostPreviewMetaData &
Required<Pick<PostPreviewMetaData, 'publicationDate'>>;
};
const getPostsByYear = (posts: PostData[]) => {
const yearCollection = new Map<string, PostData[]>();
for (const post of posts) {
const currentPostYear = new Date(post.meta.publicationDate)
.getFullYear()
.toString();
const yearPosts = yearCollection.get(currentPostYear) ?? [];
yearCollection.set(currentPostYear, [...yearPosts, post]);
}
return yearCollection;
};
type GetPostsListOptions = {
headingLvl: HeadingLevel;
isOrdered?: boolean;
};
export type PostsListProps = Omit<
HTMLAttributes<HTMLDivElement>,
'children'
> & {
/**
* The first new result index. It will be use to make the load more button
* accessible for keyboard users.
*/
firstNewResult?: number;
/**
* The heading level to use on posts titles.
*
* @default 2
*/
headingLvl?: HeadingLevel;
/**
* Should we indicate that new posts are loading?
*
* @default false
*/
isLoading?: boolean;
/**
* A callback function to handle loading more posts.
*/
onLoadMore?: () => void;
/**
* The posts.
*/
posts: PostData[];
/**
* Should we use a different section by year?
*/
sortByYear?: boolean;
/**
* The total posts number.
*/
total?: number;
};
const PostsListWithRef: ForwardRefRenderFunction<
HTMLDivElement,
PostsListProps
> = (
{
firstNewResult,
headingLvl = 2,
isLoading = false,
onLoadMore,
posts,
sortByYear = false,
total,
...props
},
ref
) => {
const wrapperRef = useRef<HTMLDivElement | null>(null);
const firstNewResultRef: RefCallback<HTMLLIElement> = useCallback((el) => {
el?.focus();
}, []);
const intl = useIntl();
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,
}
);
const loadMoreBtn = intl.formatMessage({
defaultMessage: 'Load more posts?',
description: 'PostsList: load more button',
id: 'hGvQpI',
});
const getPostsList = useCallback(
(
data: PostData[],
{ headingLvl: lvl, isOrdered }: GetPostsListOptions,
indexAcc = 0
) => (
<List
hideMarker
isOrdered={isOrdered}
// eslint-disable-next-line react/jsx-no-literals
spacing="md"
>
{data.map(({ id, ...post }, index) => {
const isFirstNewResult = firstNewResult === indexAcc + index;
return (
<ListItem
key={id}
ref={isFirstNewResult ? firstNewResultRef : undefined}
tabIndex={isFirstNewResult ? -1 : undefined}
>
<PostPreview {...post} headingLvl={lvl} />
</ListItem>
);
})}
</List>
),
[firstNewResult, firstNewResultRef]
);
const getSortedPostsList = useCallback(
(data: PostData[]) => {
const postsByYear = Array.from(getPostsByYear(data));
const postsLvl =
headingLvl < MAX_HEADING_LVL
? ((headingLvl + 1) as HeadingLevel)
: headingLvl;
let indexAcc = 0;
return postsByYear.map(([year, sortedPosts], index) => {
indexAcc +=
index > 0 ? postsByYear[index - 1][1].length : sortedPosts.length;
return (
<section className={styles.section} key={year}>
<Heading className={styles.year} level={headingLvl}>
{year}
</Heading>
{getPostsList(
sortedPosts,
{
headingLvl: postsLvl,
isOrdered: true,
},
indexAcc
)}
</section>
);
});
},
[getPostsList, headingLvl]
);
return (
<div {...props} ref={mergeRefs([wrapperRef, ref])}>
{sortByYear
? getSortedPostsList(posts)
: getPostsList(posts, { headingLvl })}
{total ? (
<ProgressBar
aria-label={progressInfo}
className={styles.progress}
current={posts.length}
isCentered
isLoading={isLoading}
label={progressInfo}
max={total}
/>
) : null}
{onLoadMore ? (
<Button
className={styles.btn}
isLoading={isLoading}
// eslint-disable-next-line react/jsx-no-literals
kind="tertiary"
onClick={onLoadMore}
>
{loadMoreBtn}
</Button>
) : null}
</div>
);
};
export const PostsList = forwardRef(PostsListWithRef);
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