<?php


function dynamiques_article_save_post($post_id)
{
	$current_article_ID = $post_id;
	$post_type = get_post_type($post_id);
	if ($current_article_ID && $post_type !== 'articles') return;

	$related_revue_ID = get_field('related_revue', $current_article_ID);

	dynamiques_article_remove_articles_from_all_revues($current_article_ID);

	if ($related_revue_ID && is_numeric($related_revue_ID) && $related_revue_ID !== '') {
		dynamiques_article_include_article_in_revue_articles_array($current_article_ID, $related_revue_ID);
	}
}
add_action('acf/save_post', 'dynamiques_article_save_post', 20);


function dynamiques_article_include_article_in_revue_articles_array($current_article_ID, $related_revue_ID)
{
	$current_article = get_post($current_article_ID);
	$related_revues_articles = get_field('articles', $related_revue_ID);
	if (!is_array($related_revues_articles)) {
		$related_revues_articles = [];
	}
	$related_revues_articles[] = $current_article;


	update_field('articles', $related_revues_articles, $related_revue_ID);
}


function dynamiques_article_remove_articles_from_all_revues($current_article_ID)
{
	$revues_containing_article = new WP_Query(array(
		'post_type' => 'revues',
		'meta_query' => array(
			array(
				'key' => 'articles',
				'value' => '"' . $current_article_ID . '"',
				'compare' => 'LIKE',
			),
		),
	));

	foreach ($revues_containing_article->posts as $revue) {
		$revue_ID = $revue->ID;
		$revue_articles = get_field('articles', $revue_ID);

		$revue_articles = array_filter($revue_articles, function ($article) use ($current_article_ID) {
			return (is_object($article) && isset($article->ID)) ? $article->ID != $current_article_ID : $article != $current_article_ID;
		});
		update_field('articles', $revue_articles, $revue_ID);
	}
}