<?php

/**

 * WP_REST_Navigation_Fallback_Controller class

 *

 * REST Controller to create/fetch a fallback Navigation Menu.

 *

 * @package WordPress

 * @subpackage REST_API

 * @since 6.3.0

 */

/**

 * REST Controller to fetch a fallback Navigation Block Menu. If needed it creates one.

 *

 * @since 6.3.0

 */

class WP_REST_Navigation_Fallback_Controller extends WP_REST_Controller {

	/**

	 * The Post Type for the Controller

	 *

	 * @since 6.3.0

	 *

	 * @var string

	 */

	private $post_type;

	/**

	 * Constructs the controller.

	 *

	 * @since 6.3.0

	 */

	public function __construct() {

		$this->namespace = 'wp-block-editor/v1';

		$this->rest_base = 'navigation-fallback';

		$this->post_type = 'wp_navigation';

	}

	/**

	 * Registers the controllers routes.

	 *

	 * @since 6.3.0

	 */

	public function register_routes() {

		// Lists a single nav item based on the given id or slug.

		register_rest_route(

			$this->namespace,

			'/' . $this->rest_base,

			array(

				array(

					'methods'             => WP_REST_Server::READABLE,

					'callback'            => array( $this, 'get_item' ),

					'permission_callback' => array( $this, 'get_item_permissions_check' ),

					'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::READABLE ),

				),

				'schema' => array( $this, 'get_item_schema' ),

			)

		);

	}

	/**

	 * Checks if a given request has access to read fallbacks.

	 *

	 * @since 6.3.0

	 *

	 * @param WP_REST_Request $request Full details about the request.

	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.

	 */

	public function get_item_permissions_check( $request ) {

		$post_type = get_post_type_object( $this->post_type );

		// Getting fallbacks requires creating and reading `wp_navigation` posts.

		if ( ! current_user_can( $post_type->cap->create_posts ) || ! current_user_can( 'edit_theme_options' ) || ! current_user_can( 'edit_posts' ) ) {

			return new WP_Error(

				'rest_cannot_create',

				__( 'Sorry, you are not allowed to create Navigation Menus as this user.' ),

				array( 'status' => rest_authorization_required_code() )

			);

		}

		if ( 'edit' === $request['context'] && ! current_user_can( $post_type->cap->edit_posts ) ) {

			return new WP_Error(

				'rest_forbidden_context',

				__( 'Sorry, you are not allowed to edit Navigation Menus as this user.' ),

				array( 'status' => rest_authorization_required_code() )

			);

		}

		return true;

	}

	/**

	 * Gets the most appropriate fallback Navigation Menu.

	 *

	 * @since 6.3.0

	 *

	 * @param WP_REST_Request $request Full details about the request.

	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.

	 */

	public function get_item( $request ) {

		$post = WP_Navigation_Fallback::get_fallback();

		if ( empty( $post ) ) {

			return rest_ensure_response( new WP_Error( 'no_fallback_menu', __( 'No fallback menu found.' ), array( 'status' => 404 ) ) );

		}

		$response = $this->prepare_item_for_response( $post, $request );

		return $response;

	}

	/**

	 * Retrieves the fallbacks' schema, conforming to JSON Schema.

	 *

	 * @since 6.3.0

	 *

	 * @return array Item schema data.

	 */

	public function get_item_schema() {

		if ( $this->schema ) {

			return $this->add_additional_fields_schema( $this->schema );

		}

		$this->schema = array(

			'$schema'    => 'http://json-schema.org/draft-04/schema#',

			'title'      => 'navigation-fallback',

			'type'       => 'object',

			'properties' => array(

				'id' => array(

					'description' => __( 'The unique identifier for the Navigation Menu.' ),

					'type'        => 'integer',

					'context'     => array( 'view', 'edit', 'embed' ),

					'readonly'    => true,

				),

			),

		);

		return $this->add_additional_fields_schema( $this->schema );

	}

	/**

	 * Matches the post data to the schema we want.

	 *

	 * @since 6.3.0

	 *

	 * @param WP_Post         $item    The wp_navigation Post object whose response is being prepared.

	 * @param WP_REST_Request $request Request object.

	 * @return WP_REST_Response $response The response data.

	 */

	public function prepare_item_for_response( $item, $request ) {

		$data = array();

		$fields = $this->get_fields_for_response( $request );

		if ( rest_is_field_included( 'id', $fields ) ) {

			$data['id'] = (int) $item->ID;

		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';

		$data    = $this->add_additional_fields_to_object( $data, $request );

		$data    = $this->filter_response_by_context( $data, $context );

		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {

			$links = $this->prepare_links( $item );

			$response->add_links( $links );

		}

		return $response;

	}

	/**

	 * Prepares the links for the request.

	 *

	 * @since 6.3.0

	 *

	 * @param WP_Post $post the Navigation Menu post object.

	 * @return array Links for the given request.

	 */

	private function prepare_links( $post ) {

		return array(

			'self' => array(

				'href'       => rest_url( rest_get_route_for_post( $post->ID ) ),

				'embeddable' => true,

			),

		);

	}

}