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import { ReactElement } from 'react';
import { GetStaticProps } from 'next';
import Head from 'next/head';
import { t } from '@lingui/macro';
import Layout from '@components/Layouts/Layout';
import { seo } from '@config/seo';
import { config } from '@config/website';
import { getPublishedPosts } from '@services/graphql/blog';
import { NextPageWithLayout } from '@ts/types/app';
import { BlogPageProps, PostsList as PostsListData } from '@ts/types/blog';
import { loadTranslation } from '@utils/helpers/i18n';
import PostsList from '@components/PostsList/PostsList';
import useSWRInfinite from 'swr/infinite';
import { Button } from '@components/Buttons';
const Blog: NextPageWithLayout<BlogPageProps> = ({ fallback }) => {
const getKey = (pageIndex: number, previousData: PostsListData) => {
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,
{ fallback }
);
const isLoadingInitialData = !data && !error;
const isLoadingMore: boolean =
isLoadingInitialData ||
(size > 0 && data !== undefined && typeof data[size - 1] === 'undefined');
if (error) return <div>{t`Failed to load.`}</div>;
if (!data) return <div>{t`Loading...`}</div>;
const hasNextPage = data && data[data.length - 1].pageInfo.hasNextPage;
return (
<>
<Head>
<title>{seo.blog.title}</title>
<meta name="description" content={seo.blog.description} />
</Head>
<h1>{t`Blog`}</h1>
<PostsList data={data} showYears={true} />
{hasNextPage && (
<Button
isDisabled={isLoadingMore}
clickHandler={() => setSize(size + 1)}
>{t`Load more?`}</Button>
)}
</>
);
};
Blog.getLayout = function getLayout(page: ReactElement) {
return <Layout>{page}</Layout>;
};
export const getStaticProps: GetStaticProps = async (context) => {
const translation = await loadTranslation(
context.locale!,
process.env.NODE_ENV === 'production'
);
const data = await getPublishedPosts({ first: config.postsPerPage });
return {
props: {
fallback: {
'/api/posts': data,
},
translation,
},
};
};
export default Blog;
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