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import { recordTracksEvent } from '@automattic/calypso-analytics';
import { useEffect, createInterpolateElement, useRef } from '@wordpress/element';
import { __ } from '@wordpress/i18n';
import { useSearchParams } from 'react-router-dom';
import { useHelpCenterContext } from '../contexts/HelpCenterContext';
import { usePostByUrl } from '../hooks';
import { useHelpCenterArticleScroll } from '../hooks/use-help-center-article-scroll';
import { useHelpCenterArticleTabComponent } from '../hooks/use-help-center-article-tab-component';
import { BackToTopButton } from './back-to-top-button';
import ArticleContent from './help-center-article-content';
import './help-center-article.scss';
export const HelpCenterArticle = () => {
const [ searchParams ] = useSearchParams();
const { sectionName } = useHelpCenterContext();
const postUrl = searchParams.get( 'link' ) || '';
const query = searchParams.get( 'query' );
const elementRef = useRef< HTMLDivElement | null >( null );
const scrollParentRef = useRef< HTMLElement | null >( null );
useEffect( () => {
if ( elementRef.current ) {
scrollParentRef.current = elementRef.current?.closest( '.help-center__container-content' );
}
}, [ elementRef ] );
const { data: post, isLoading, error } = usePostByUrl( postUrl );
useHelpCenterArticleTabComponent( post?.content );
useHelpCenterArticleScroll( post?.ID, scrollParentRef );
useEffect( () => {
//If a url includes an anchor, let's scroll this into view!
if ( postUrl?.includes( '#' ) && post?.content ) {
setTimeout( () => {
const anchorId = postUrl.split( '#' ).pop();
if ( anchorId ) {
const element = document.getElementById( anchorId );
if ( element ) {
element.scrollIntoView( { behavior: 'instant' } );
}
}
}, 100 );
}
}, [ postUrl, post ] );
useEffect( () => {
if ( post ) {
const tracksData = {
force_site_id: true,
location: 'help-center',
section: sectionName,
result_url: post.URL,
post_id: post.ID,
blog_id: post.site_ID,
search_query: query,
};
recordTracksEvent( 'calypso_helpcenter_article_viewed', tracksData );
}
}, [ post, query, sectionName ] );
// Trigger event for each section scrolled into view
useEffect( () => {
if ( elementRef.current ) {
const observer = new IntersectionObserver(
( entries ) => {
entries.forEach( ( entry ) => {
if ( entry.isIntersecting ) {
const tracksData = {
force_site_id: true,
location: 'help-center',
post_url: post?.URL,
post_id: post?.ID,
blog_id: post?.site_ID,
section_id: entry?.target?.id,
};
recordTracksEvent( 'calypso_helpcenter_article_section_view', tracksData );
observer.unobserve( entry.target ); // Unobserve after first intersection
}
} );
},
{ threshold: 0.1 }
);
const h2Elements = elementRef.current.querySelectorAll( 'h2' );
h2Elements.forEach( ( h2 ) => observer.observe( h2 ) );
return () => {
observer.disconnect();
};
}
}, [ elementRef, post?.ID, post?.URL, post?.site_ID ] );
return (
<div className="help-center-article" ref={ elementRef }>
{ ! error && <ArticleContent post={ post } isLoading={ isLoading } /> }
{ ! isLoading && error && (
<p className="help-center-article__error">
{ createInterpolateElement(
__(
"Sorry, we couldn't load that article. <url>Click here</url> to open it in a new tab",
__i18n_text_domain__
),
{
url: <a target="_blank" rel="noopener noreferrer" href={ postUrl } />,
}
) }
</p>
) }
<BackToTopButton />
</div>
);
};
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