<?php




function dynamiques_revue_save_post($post_id)
{
	$current_revue_ID = $post_id;
	$post_type = get_post_type($post_id);
	if ($post_type !== 'revues') return;

	// Remove articles that are no longer associated with the current review
	dynamiques_revue_empty_unmapped_articles($current_revue_ID);

	// Link articles to the current review
	dynamiques_revue_link_mapped_articles($current_revue_ID);
}
add_action('acf/save_post', 'dynamiques_revue_save_post', 20);


//*******************************************************************************************************/
//  Compare the articles linked to the current review being saved and remove those that are no longer associated
//*******************************************************************************************************/


function dynamiques_revue_empty_unmapped_articles($current_revue_ID)
{
	$articles = get_field('articles', $current_revue_ID);
	if (!$articles) return;

	//  GET ALL ARTICLES RELATED TO THE REVUE AND CHECK IF THEY ARE HANDLED BY THE PARENT REVUE IN THE ARTICLE FIELD

	$articles_related_to_revue = new WP_Query(array(
		'post_type' => 'articles',
		'meta_query' => array(
			array(
				'key' => 'related_revue',
				'value' => $current_revue_ID,
				'compare' => '=',
			),
		),
	));

	$articles_related_to_revue_posts = $articles_related_to_revue->posts;


	$articles_related_to_revue_ids = array_map(function ($post) {
		return $post->ID;
	}, $articles_related_to_revue_posts);

	$articles_ids = array_map(function ($article) {
		return $article->ID;
	}, $articles);

	//  GET THE ARTICLES THAT ARE NOT HANDLED BY THE PARENT REVUE IN THE ARTICLE FIELD
	$unmapped_articles_ids = array_diff($articles_related_to_revue_ids, $articles_ids);


	//  EMPTY THE ARTICLE FIELD BECAUSE NOT USED BY THE PARENT REVUE

	foreach ($unmapped_articles_ids as $article_id) {
		update_field('related_revue', null, $article_id);
	}
}

function dynamiques_revue_link_mapped_articles($current_revue_ID)
{
	$articles = get_field('articles', $current_revue_ID);
	if (!$articles) return;

	foreach ($articles as $article) {
		$article_id = $article->ID;
		$related_revue = get_field('related_revue', $article_id);
		update_field('related_revue', $current_revue_ID, $article_id);
	}
}


//*******************************************************************************************************/
//  Check if the issue number is already used by another revue
//*******************************************************************************************************/

add_filter('acf/validate_value/name=issue_number', 'dynamiques_revue_check_issue_number', 10, 4);

function dynamiques_revue_check_issue_number($valid, $value, $field, $input)
{
	if (!$valid) {
		return $valid;
	}

	// Récupère l'ID du post en cours d'édition
	$current_revue_ID = isset($_POST['post_ID']) ? intval($_POST['post_ID']) : 0;

	// Recherche d'autres revues avec le même numéro
	$args = array(
		'post_type'      => 'revues',
		'post_status'    => 'any',
		'posts_per_page' => 1,
		'post__not_in'   => array($current_revue_ID),
		'meta_query'     => array(
			array(
				'key'     => 'issue_number',
				'value'   => $value,
				'compare' => '=',
			),
		),
	);
	$query = new WP_Query($args);

	if ($query->have_posts()) {
		return 'Ce numéro de revue existe déjà.';
	}

	return $valid;
}