Pink-Crab/Perique-Registerables

<?php

declare(strict_types=1);

/**
 * Registration Registrar for Shared Meta Boxes.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Glynn Quelch <glynn.quelch@gmail.com>
 * @license http://www.opensource.org/licenses/mit-license.html  MIT License
 * @package PinkCrab\Registerables
 * @since 0.7.0
 */

namespace PinkCrab\Registerables\Registrar;

use PinkCrab\Registerables\Meta_Data;
use PinkCrab\Registerables\Registrar\Registrar;
use PinkCrab\Registerables\Shared_Meta_Box_Controller;
use PinkCrab\Registerables\Registrar\Meta_Box_Registrar;
use PinkCrab\Registerables\Registrar\Meta_Data_Registrar;
use PinkCrab\Registerables\Module\Middleware\Registerable;

class Shared_Meta_Box_Registrar implements Registrar {

    protected Meta_Box_Registrar $meta_box_registrar;
    protected Meta_Data_Registrar $meta_data_registrar;

    public function __construct(
        Meta_Box_Registrar $meta_box_registrar,
        Meta_Data_Registrar $meta_data_registrar
    ) {
        $this->meta_box_registrar  = $meta_box_registrar;
        $this->meta_data_registrar = $meta_data_registrar;
    }

    /**
     * Used to register a registerable
     *
     * @param \PinkCrab\Registerables\Module\Middleware\Registerable $registerable
     * @return void
     */
    public function register( Registerable $registerable ): void {
        if ( ! is_a( $registerable, Shared_Meta_Box_Controller::class ) ) {
            return;
        }

        /** @var Shared_Meta_Box_Controller $registerable, Validation call below catches no Shared_Meta_Box_Controller Registerables */

        // Get the meta box and meta data.
        $meta_box  = $registerable->meta_box();
        $meta_data = $registerable->meta_data( array() );

        // Register the meta box.
        $this->meta_box_registrar->register( $meta_box );

        // Register all meta data.
        foreach ( $this->filter_meta_data( $meta_data ) as $meta_field ) {
            // Register meta data for each post type.
            foreach ( $meta_box->screen as $post_type ) {
                $this->meta_data_registrar->register_for_post_type( $meta_field, $post_type );
            }
        }

    }

    /**
     * Filters all non meta data from array.
     *
     * @param mixed[] $meta_data
     * @return Meta_Data[]
     */
    protected function filter_meta_data( array $meta_data ): array {
        return array_filter(
            $meta_data,
            function( $e ) {
                return is_a( $e, Meta_Data::class );
            }
        );
    }
}