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import Link from 'next/link';
import useSWRInfinite from 'swr/infinite';
import { t } from '@lingui/macro';
import { config } from '@config/website';
import { getPublishedPosts } from '@services/graphql/blog';
import { ArticlePreview } from '@ts/types/articles';
import { PageInfo } from '@ts/types/pagination';
import styles from './PostsList.module.scss';
type TitleLevel = 2 | 3 | 4 | 5 | 6;
type DataType = {
posts: ArticlePreview;
pageInfo: PageInfo;
};
const PostsList = ({ titleLevel }: { titleLevel: TitleLevel }) => {
const TitleTag = `h${titleLevel}` as keyof JSX.IntrinsicElements;
const getKey = (pageIndex: number, previousData: DataType) => {
if (previousData && !previousData.posts) return null;
const args =
pageIndex === 0
? { first: config.postsPerPage }
: {
first: config.postsPerPage,
after: previousData.pageInfo.endCursor,
};
return args;
};
const { data, error, size, setSize } = useSWRInfinite(
getKey,
getPublishedPosts
);
const isLoadingInitialData = !data && !error;
const isLoadingMore: boolean =
isLoadingInitialData ||
(size > 0 && data !== undefined && typeof data[size - 1] === 'undefined');
const getPostsList = () => {
if (error) return <div>{t`Failed to load.`}</div>;
if (!data) return <div>{t`Loading...`}</div>;
return data.map((page) => {
if (page.posts.length === 0) {
return t`No results found.`;
} else {
return page.posts.map((post) => {
return (
<li key={post.id}>
<article>
<header>
<TitleTag>
<Link href={`/article/${post.slug}`}>
<a>{post.title}</a>
</Link>
</TitleTag>
</header>
<div dangerouslySetInnerHTML={{ __html: post.content }}></div>
</article>
</li>
);
});
}
});
};
const hasNextPage = data && data[data.length - 1].pageInfo.hasNextPage;
return (
<ol className={styles.wrapper}>
{getPostsList()}
{hasNextPage && (
<button
disabled={isLoadingMore}
type="button"
onClick={() => setSize(size + 1)}
>{t`Load more?`}</button>
)}
</ol>
);
};
export default PostsList;
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