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import { GetStaticProps, GetStaticPropsContext } from 'next';
import Head from 'next/head';
import { t } from '@lingui/macro';
import { getLayout } from '@components/Layouts/Layout';
import { seo } from '@config/seo';
import { config } from '@config/website';
import { NextPageWithLayout } from '@ts/types/app';
import { BlogPageProps, PostsList as PostsListData } from '@ts/types/blog';
import { defaultLocale, loadTranslation } from '@utils/helpers/i18n';
import PostsList from '@components/PostsList/PostsList';
import useSWRInfinite from 'swr/infinite';
import { Button } from '@components/Buttons';
import { getPublishedPosts } from '@services/graphql/queries';
import PostHeader from '@components/PostHeader/PostHeader';
import { ThematicsList, TopicsList } from '@components/Widgets';
import Sidebar from '@components/Sidebar/Sidebar';
import styles from '@styles/pages/Page.module.scss';
import { useEffect, useRef, useState } from 'react';
import Spinner from '@components/Spinner/Spinner';
import { Blog as BlogSchema, Graph, WebPage } from 'schema-dts';
import { useRouter } from 'next/router';
import PaginationCursor from '@components/PaginationCursor/PaginationCursor';
const Blog: NextPageWithLayout<BlogPageProps> = ({ fallback }) => {
const lastPostRef = useRef<HTMLSpanElement>(null);
const router = useRouter();
const getKey = (pageIndex: number, previousData: PostsListData) => {
if (previousData && !previousData.posts) return null;
return pageIndex === 0
? { first: config.postsPerPage }
: {
first: config.postsPerPage,
after: previousData.pageInfo.endCursor,
};
};
const { data, error, size, setSize } = useSWRInfinite(
getKey,
getPublishedPosts,
{ fallback }
);
const [totalPostsCount, setTotalPostsCount] = useState<number>(0);
useEffect(() => {
if (data) setTotalPostsCount(data[0].pageInfo.total);
}, [data]);
const [loadedPostsCount, setLoadedPostsCount] = useState<number>(
config.postsPerPage
);
useEffect(() => {
if (data && data.length > 0) {
const newCount =
config.postsPerPage +
data[0].pageInfo.total -
data[data.length - 1].pageInfo.total;
setLoadedPostsCount(newCount);
}
}, [data]);
const isLoadingInitialData = !data && !error;
const isLoadingMore: boolean =
isLoadingInitialData ||
(size > 0 && data !== undefined && typeof data[size - 1] === 'undefined');
const hasNextPage = data && data[data.length - 1].pageInfo.hasNextPage;
const loadMorePosts = () => {
if (lastPostRef.current) {
lastPostRef.current.focus();
}
setSize(size + 1);
};
const getPostsList = () => {
if (error) return t`Failed to load.`;
if (!data) return <Spinner />;
return <PostsList ref={lastPostRef} data={data} showYears={true} />;
};
const title = t`Blog`;
const pageUrl = `${config.url}${router.asPath}`;
const webpageSchema: WebPage = {
'@id': `${pageUrl}`,
'@type': 'WebPage',
breadcrumb: { '@id': `${config.url}/#breadcrumb` },
name: seo.blog.title,
description: seo.blog.description,
inLanguage: config.locales.defaultLocale,
reviewedBy: { '@id': `${config.url}/#branding` },
url: `${config.url}`,
isPartOf: {
'@id': `${config.url}`,
},
};
const blogSchema: BlogSchema = {
'@id': `${config.url}/#blog`,
'@type': 'Blog',
author: { '@id': `${config.url}/#branding` },
creator: { '@id': `${config.url}/#branding` },
editor: { '@id': `${config.url}/#branding` },
inLanguage: config.locales.defaultLocale,
license: 'https://creativecommons.org/licenses/by-sa/4.0/deed.fr',
mainEntityOfPage: { '@id': `${pageUrl}` },
};
const schemaJsonLd: Graph = {
'@context': 'https://schema.org',
'@graph': [webpageSchema, blogSchema],
};
return (
<>
<Head>
<title>{seo.blog.title}</title>
<meta name="description" content={seo.blog.description} />
<meta property="og:url" content={`${pageUrl}`} />
<meta property="og:type" content="website" />
<meta property="og:title" content={title} />
<meta property="og:description" content={seo.blog.description} />
<script
type="application/ld+json"
dangerouslySetInnerHTML={{ __html: JSON.stringify(schemaJsonLd) }}
></script>
</Head>
<article
id="blog"
className={`${styles.article} ${styles['article--no-comments']}`}
>
<PostHeader title={title} meta={{ results: totalPostsCount }} />
<div className={styles.body}>
{getPostsList()}
{hasNextPage && (
<>
<PaginationCursor
current={loadedPostsCount}
total={totalPostsCount}
/>
<Button
isDisabled={isLoadingMore}
clickHandler={loadMorePosts}
position="center"
>{t`Load more?`}</Button>
</>
)}
</div>
<Sidebar position="right" title={t`Filter by`}>
<ThematicsList title={t`Thematics`} />
<TopicsList title={t`Topics`} />
</Sidebar>
</article>
</>
);
};
Blog.getLayout = getLayout;
export const getStaticProps: GetStaticProps = async (
context: GetStaticPropsContext
) => {
const breadcrumbTitle = t`Blog`;
const data = await getPublishedPosts({ first: config.postsPerPage });
const { locale } = context;
const translation = await loadTranslation(locale || defaultLocale);
return {
props: {
breadcrumbTitle,
fallback: {
'/api/posts': data,
},
locale,
translation,
},
};
};
export default Blog;
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