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namespace Yoast\WP\SEO\Repositories;

use Yoast\WP\Lib\Model;
use Yoast\WP\Lib\ORM;
use Yoast\WP\SEO\Builders\Indexable_Hierarchy_Builder;
use Yoast\WP\SEO\Models\Indexable;

/**
 * Class Indexable_Hierarchy_Repository.
 */
class Indexable_Hierarchy_Repository {

	/**
	 * Represents the indexable hierarchy builder.
	 *
	 * @var Indexable_Hierarchy_Builder
	 */
	protected $builder;

	/**
	 * Sets the hierarchy builder.
	 *
	 * @required
	 *
	 * @param Indexable_Hierarchy_Builder $builder The indexable hierarchy builder.
	 */
	public function set_builder( Indexable_Hierarchy_Builder $builder ) {
		$this-&gt;builder = $builder;
	}

	/**
	 * Removes all ancestors for an indexable.
	 *
	 * @param int $indexable_id The indexable id.
	 *
	 * @return bool Whether or not the indexables were successfully deleted.
	 */
	public function clear_ancestors( $indexable_id ) {
		return $this-&gt;query()-&gt;where( 'indexable_id', $indexable_id )-&gt;delete_many();
	}

	/**
	 * Adds an ancestor to an indexable.
	 *
	 * @param int $indexable_id The indexable id.
	 * @param int $ancestor_id  The ancestor id.
	 * @param int $depth        The depth.
	 *
	 * @return bool Whether or not the ancestor was added successfully.
	 */
	public function add_ancestor( $indexable_id, $ancestor_id, $depth ) {
		$hierarchy = $this-&gt;query()-&gt;create(
			[
				'indexable_id' =&gt; $indexable_id,
				'ancestor_id'  =&gt; $ancestor_id,
				'depth'        =&gt; $depth,
				'blog_id'      =&gt; \get_current_blog_id(),
			]
		);

		return $hierarchy-&gt;save();
	}

	/**
	 * Retrieves the ancestors. Create them when empty.
	 *
	 * @param Indexable $indexable The indexable to get the ancestors for.
	 *
	 * @return int[] The indexable id's of the ancestors in order of grandparent to child.
	 */
	public function find_ancestors( Indexable $indexable ) {
		$ancestors = $this-&gt;query()
			-&gt;select( 'ancestor_id' )
			-&gt;where( 'indexable_id', $indexable-&gt;id )
			-&gt;order_by_desc( 'depth' )
			-&gt;find_array();

		if ( ! empty( $ancestors ) ) {
			if ( \count( $ancestors ) === 1 &amp;&amp; $ancestors[0]['ancestor_id'] === '0' ) {
				return [];
			}
			return \wp_list_pluck( $ancestors, 'ancestor_id' );
		}

		$indexable = $this-&gt;builder-&gt;build( $indexable );

		return \wp_list_pluck( $indexable-&gt;ancestors, 'id' );
	}

	/**
	 * Finds the children for a given indexable.
	 *
	 * @param Indexable $indexable The indexable to find the children for.
	 *
	 * @return array Array with indexable id's for the children.
	 */
	public function find_children( Indexable $indexable ) {
		$children = $this-&gt;query()
			-&gt;select( 'indexable_id' )
			-&gt;where( 'ancestor_id', $indexable-&gt;id )
			-&gt;find_array();

		if ( empty( $children ) ) {
			return [];
		}

		return \wp_list_pluck( $children, 'indexable_id' );
	}

	/**
	 * Starts a query for this repository.
	 *
	 * @return ORM
	 */
	public function query() {
		return Model::of_type( 'Indexable_Hierarchy' );
	}

	/**
	 * Finds all the children by given ancestor id's.
	 *
	 * @param array $object_ids List of id's to get the children for.
	 *
	 * @return array List of indexable id's for the children.
	 */
	public function find_children_by_ancestor_ids( array $object_ids ) {
		if ( empty( $object_ids ) ) {
			return [];
		}

		$children = $this-&gt;query()
			-&gt;select( 'indexable_id' )
			-&gt;where_in( 'ancestor_id', $object_ids )
			-&gt;find_array();

		if ( empty( $children ) ) {
			return [];
		}

		return \wp_list_pluck( $children, 'indexable_id' );
	}
}
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