<?php

/**

 * REST API: WP_REST_Themes_Controller class

 *

 * @package WordPress

 * @subpackage REST_API

 * @since 5.0.0

 */

/**

 * Core class used to manage themes via the REST API.

 *

 * @since 5.0.0

 *

 * @see WP_REST_Controller

 */

class WP_REST_Themes_Controller extends WP_REST_Controller {

	/**

	 * Constructor.

	 *

	 * @since 5.0.0

	 */

	public function __construct() {

		$this->namespace = 'wp/v2';

		$this->rest_base = 'themes';

	}

	/**

	 * Registers the routes for the objects of the controller.

	 *

	 * @since 5.0.0

	 *

	 * @see register_rest_route()

	 */

	public function register_routes() {

		register_rest_route(

			$this->namespace,

			'/' . $this->rest_base,

			array(

				array(

					'methods'             => WP_REST_Server::READABLE,

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

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

					'args'                => $this->get_collection_params(),

				),

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

			)

		);

	}

	/**

	 * Checks if a given request has access to read the theme.

	 *

	 * @since 5.0.0

	 *

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

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

	 */

	public function get_items_permissions_check( $request ) {

		if ( ! is_user_logged_in() || ! current_user_can( 'edit_posts' ) ) {

			return new WP_Error( 'rest_user_cannot_view', __( 'Sorry, you are not allowed to view themes.' ), array( 'status' => rest_authorization_required_code() ) );

		}

		return true;

	}

	/**

	 * Retrieves a collection of themes.

	 *

	 * @since 5.0.0

	 *

	 * @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_items( $request ) {

		// Retrieve the list of registered collection query parameters.

		$registered = $this->get_collection_params();

		$themes     = array();

		if ( isset( $registered['status'], $request['status'] ) && in_array( 'active', $request['status'], true ) ) {

			$active_theme = wp_get_theme();

			$active_theme = $this->prepare_item_for_response( $active_theme, $request );

			$themes[]     = $this->prepare_response_for_collection( $active_theme );

		}

		$response = rest_ensure_response( $themes );

		$response->header( 'X-WP-Total', count( $themes ) );

		$response->header( 'X-WP-TotalPages', count( $themes ) );

		return $response;

	}

	/**

	 * Prepares a single theme output for response.

	 *

	 * @since 5.0.0

	 *

	 * @param WP_Theme        $theme   Theme object.

	 * @param WP_REST_Request $request Request object.

	 * @return WP_REST_Response Response object.

	 */

	public function prepare_item_for_response( $theme, $request ) {

		$data   = array();

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

		if ( in_array( 'theme_supports', $fields, true ) ) {

			$formats                           = get_theme_support( 'post-formats' );

			$formats                           = is_array( $formats ) ? array_values( $formats[0] ) : array();

			$formats                           = array_merge( array( 'standard' ), $formats );

			$data['theme_supports']['formats'] = $formats;

			$data['theme_supports']['post-thumbnails']   = false;

			$data['theme_supports']['responsive-embeds'] = (bool) get_theme_support( 'responsive-embeds' );

			$post_thumbnails                             = get_theme_support( 'post-thumbnails' );

			if ( $post_thumbnails ) {

				// $post_thumbnails can contain a nested array of post types.

				// e.g. array( array( 'post', 'page' ) ).

				$data['theme_supports']['post-thumbnails'] = is_array( $post_thumbnails ) ? $post_thumbnails[0] : true;

			}

		}

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

		// Wrap the data in a response object.

		$response = rest_ensure_response( $data );

		/**

		 * Filters theme data returned from the REST API.

		 *

		 * @since 5.0.0

		 *

		 * @param WP_REST_Response $response The response object.

		 * @param WP_Theme         $theme    Theme object used to create response.

		 * @param WP_REST_Request  $request  Request object.

		 */

		return apply_filters( 'rest_prepare_theme', $response, $theme, $request );

	}

	/**

	 * Retrieves the theme's schema, conforming to JSON Schema.

	 *

	 * @since 5.0.0

	 *

	 * @return array Item schema data.

	 */

	public function get_item_schema() {

		$schema = array(

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

			'title'      => 'theme',

			'type'       => 'object',

			'properties' => array(

				'theme_supports' => array(

					'description' => __( 'Features supported by this theme.' ),

					'type'        => 'array',

					'readonly'    => true,

					'properties'  => array(

						'formats'           => array(

							'description' => __( 'Post formats supported.' ),

							'type'        => 'array',

							'readonly'    => true,

						),

						'post-thumbnails'   => array(

							'description' => __( 'Whether the theme supports post thumbnails.' ),

							'type'        => array( 'array', 'bool' ),

							'readonly'    => true,

						),

						'responsive-embeds' => array(

							'description' => __( 'Whether the theme supports responsive embedded content.' ),

							'type'        => 'bool',

							'readonly'    => true,

						),

					),

				),

			),

		);

		return $this->add_additional_fields_schema( $schema );

	}

	/**

	 * Retrieves the search params for the themes collection.

	 *

	 * @since 5.0.0

	 *

	 * @return array Collection parameters.

	 */

	public function get_collection_params() {

		$query_params = parent::get_collection_params();

		$query_params['status'] = array(

			'description'       => __( 'Limit result set to themes assigned one or more statuses.' ),

			'type'              => 'array',

			'items'             => array(

				'enum' => array( 'active' ),

				'type' => 'string',

			),

			'required'          => true,

			'sanitize_callback' => array( $this, 'sanitize_theme_status' ),

		);

		/**

		 * Filter collection parameters for the themes controller.

		 *

		 * @since 5.0.0

		 *

		 * @param array        $query_params JSON Schema-formatted collection parameters.

		 */

		return apply_filters( 'rest_themes_collection_params', $query_params );

	}

	/**

	 * Sanitizes and validates the list of theme status.

	 *

	 * @since 5.0.0

	 *

	 * @param  string|array    $statuses  One or more theme statuses.

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

	 * @param  string          $parameter Additional parameter to pass to validation.

	 * @return array|WP_Error A list of valid statuses, otherwise WP_Error object.

	 */

	public function sanitize_theme_status( $statuses, $request, $parameter ) {

		$statuses = wp_parse_slug_list( $statuses );

		foreach ( $statuses as $status ) {

			$result = rest_validate_request_arg( $status, $request, $parameter );

			if ( is_wp_error( $result ) ) {

				return $result;

			}

		}

		return $statuses;

	}

}