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<?php

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namespace Yoast\WP\SEO\Integrations;

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use stdClass;

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use WP_Error;

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use WP_Post;

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use WPSEO_Primary_Term;

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use Yoast\WP\SEO\Conditionals\Primary_Category_Conditional;

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/**

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* Adds customizations to the front end for the primary category.

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class Primary_Category implements Integration_Interface {

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/**

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* Returns the conditionals based on which this loadable should be active.

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* In this case only when on the frontend, the post overview, post edit or new post admin page.

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* @return array The conditionals.

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public static function get_conditionals() {

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return [ Primary_Category_Conditional::class ];

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}

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/**

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* Registers a filter to change a post's primary category.

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* @return void

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public function register_hooks() {

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\add_filter( 'post_link_category', [ $this, 'post_link_category' ], 10, 3 );

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}

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/**

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* Filters post_link_category to change the category to the chosen category by the user.

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* @param stdClass $category The category that is now used for the post link.

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* @param array|null $categories This parameter is not used.

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* @param WP_Post|null $post The post in question.

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* @return array|object|WP_Error|null The category we want to use for the post link.

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public function post_link_category( $category, $categories = null, $post = null ) {

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$post = \get_post( $post );

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if ( $post === null ) {

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return $category;

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}

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$primary_category = $this->get_primary_category( $post );

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if ( $primary_category !== false && $primary_category !== $category->cat_ID ) {

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$category = \get_category( $primary_category );

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}

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return $category;

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}

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/**

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* Get the id of the primary category.

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* @codeCoverageIgnore It justs wraps a dependency.

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* @param WP_Post $post The post in question.

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* @return int Primary category id.

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protected function get_primary_category( $post ) {

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$primary_term = new WPSEO_Primary_Term( 'category', $post->ID );

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return $primary_term->get_primary_term();

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}

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}

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