schema, conforming to JSON Schema.
	 *
	 * @since 6.5.0
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => $this->post_type,
			'type'       => 'object',
			// Base properties for every Post.
			'properties' => array(
				'id'                   => array(
					'description' => __( 'Unique identifier for the post.', 'default' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit', 'embed' ),
					'readonly'    => true,
				),
				'theme_json_version'   => array(
					'description' => __( 'Version of the theme.json schema used for the typography settings.' ),
					'type'        => 'integer',
					'default'     => static::LATEST_THEME_JSON_VERSION_SUPPORTED,
					'minimum'     => 2,
					'maximum'     => static::LATEST_THEME_JSON_VERSION_SUPPORTED,
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'font_faces'           => array(
					'description' => __( 'The IDs of the child font faces in the font family.' ),
					'type'        => 'array',
					'context'     => array( 'view', 'edit', 'embed' ),
					'items'       => array(
						'type' => 'integer',
					),
				),
				// Font family settings come directly from theme.json schema
				// See https://schemas.wp.org/trunk/theme.json
				'font_family_settings' => array(
					'description'          => __( 'font-face definition in theme.json format.' ),
					'type'                 => 'object',
					'context'              => array( 'view', 'edit', 'embed' ),
					'properties'           => array(
						'name'       => array(
							'description' => __( 'Name of the font family preset, translatable.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_text_field',
							),
						),
						'slug'       => array(
							'description' => __( 'Kebab-case unique identifier for the font family preset.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_title',
							),
						),
						'fontFamily' => array(
							'description' => __( 'CSS font-family value.' ),
							'type'        => 'string',
							'arg_options' => array(
								'sanitize_callback' => array( 'WP_Font_Utils', 'sanitize_font_family' ),
							),
						),
						'preview'    => array(
							'description' => __( 'URL to a preview image of the font family.' ),
							'type'        => 'string',
							'format'      => 'uri',
							'default'     => '',
							'arg_options' => array(
								'sanitize_callback' => 'sanitize_url',
							),
						),
					),
					'required'             => array( 'name', 'slug', 'fontFamily' ),
					'additionalProperties' => false,
				),
			),
		);

		$this->schema = $schema;

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

	/**
	 * Retrieves the item's schema for display / public consumption purposes.
	 *
	 * @since 6.5.0
	 *
	 * @return array Public item schema data.
	 */
	public function get_public_item_schema() {

		$schema = parent::get_public_item_schema();

		// Also remove `arg_options' from child font_family_settings properties, since the parent
		// controller only handles the top level properties.
		foreach ( $schema['properties']['font_family_settings']['properties'] as &$property ) {
			unset( $property['arg_options'] );
		}

		return $schema;
	}

	/**
	 * Retrieves the query params for the font family collection.
	 *
	 * @since 6.5.0
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {
		$query_params = parent::get_collection_params();

		// Remove unneeded params.
		unset(
			$query_params['after'],
			$query_params['modified_after'],
			$query_params['before'],
			$query_params['modified_before'],
			$query_params['search'],
			$query_params['search_columns'],
			$query_params['status']
		);

		$query_params['orderby']['default'] = 'id';
		$query_params['orderby']['enum']    = array( 'id', 'include' );

		/**
		 * Filters collection parameters for the font family controller.
		 *
		 * @since 6.5.0
		 *
		 * @param array $query_params JSON Schema-formatted collection parameters.
		 */
		return apply_filters( 'rest_wp_font_family_collection_params', $query_params );
	}

	/**
	 * Get the arguments used when creating or updating a font family.
	 *
	 * @since 6.5.0
	 *
	 * @return array Font family create/edit arguments.
	 */
	public function get_endpoint_args_for_item_schema( $method = WP_REST_Server::CREATABLE ) {
		if ( WP_REST_Server::CREATABLE === $method || WP_REST_Server::EDITABLE === $method ) {
			$properties = $this->get_item_schema()['properties'];
			return array(
				'theme_json_version'   => $properties['theme_json_version'],
				// When creating or updating, font_family_settings is stringified JSON, to work with multipart/form-data.
				// Font families don't currently support file uploads, but may accept preview files in the future.
				'font_family_settings' => array(
					'description'       => __( 'font-family declaration in theme.json format, encoded as a string.' ),
					'type'              => 'string',
					'required'          => true,
					'validate_callback' => array( $this, 'validate_font_family_settings' ),
					'sanitize_callback' => array( $this, 'sanitize_font_family_settings' ),
				),
			);
		}

		return parent::get_endpoint_args_for_item_schema( $method );
	}

	/**
	 * Get the child font face post IDs.
	 *
	 * @since 6.5.0
	 *
	 * @param int $font_family_id Font family post ID.
	 * @return int[] Array of child font face post IDs.
	 */
	protected function get_font_face_ids( $font_family_id ) {
		$query = new WP_Query(
			array(
				'fields'                 => 'ids',
				'post_parent'            => $font_family_id,
				'post_type'              => 'wp_font_face',
				'posts_per_page'         => 99,
				'order'                  => 'ASC',
				'orderby'                => 'id',
				'update_post_meta_cache' => false,
				'update_post_term_cache' => false,
			)
		);

		return $query->posts;
	}

	/**
	 * Prepares font family links for the request.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Post $post Post object.
	 * @return array Links for the given post.
	 */
	protected function prepare_links( $post ) {
		// Entity meta.
		$links = parent::prepare_links( $post );

		return array(
			'self'       => $links['self'],
			'collection' => $links['collection'],
			'font_faces' => $this->prepare_font_face_links( $post->ID ),
		);
	}

	/**
	 * Prepares child font face links for the request.
	 *
	 * @param int $font_family_id Font family post ID.
	 * @return array Links for the child font face posts.
	 */
	protected function prepare_font_face_links( $font_family_id ) {
		$font_face_ids = $this->get_font_face_ids( $font_family_id );
		$links         = array();
		foreach ( $font_face_ids as $font_face_id ) {
			$links[] = array(
				'embeddable' => true,
				'href'       => rest_url( sprintf( '%s/%s/%s/font-faces/%s', $this->namespace, $this->rest_base, $font_family_id, $font_face_id ) ),
			);
		}
		return $links;
	}

	/**
	 * Prepares a single font family post for create or update.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_REST_Request $request Request object.
	 * @return stdClass|WP_Error Post object or WP_Error.
	 */
	protected function prepare_item_for_database( $request ) {
		$prepared_post = new stdClass();
		// Settings have already been decoded by ::sanitize_font_family_settings().
		$settings = $request->get_param( 'font_family_settings' );

		// This is an update and we merge with the existing font family.
		if ( isset( $request['id'] ) ) {
			$existing_post = $this->get_post( $request['id'] );
			if ( is_wp_error( $existing_post ) ) {
				return $existing_post;
			}

			$prepared_post->ID = $existing_post->ID;
			$existing_settings = $this->get_settings_from_post( $existing_post );
			$settings          = array_merge( $existing_settings, $settings );
		}

		$prepared_post->post_type   = $this->post_type;
		$prepared_post->post_status = 'publish';
		$prepared_post->post_title  = $settings['name'];
		$prepared_post->post_name   = sanitize_title( $settings['slug'] );

		// Remove duplicate information from settings.
		unset( $settings['name'] );
		unset( $settings['slug'] );

		$prepared_post->post_content = wp_json_encode( $settings );

		return $prepared_post;
	}

	/**
	 * Gets the font family's settings from the post.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Post $post Font family post object.
	 * @return array Font family settings array.
	 */
	protected function get_settings_from_post( $post ) {
		$settings_json = json_decode( $post->post_content, true );

		// Default to empty strings if the settings are missing.
		return array(
			'name'       => isset( $post->post_title ) && $post->post_title ? $post->post_title : '',
			'slug'       => isset( $post->post_name ) && $post->post_name ? $post->post_name : '',
			'fontFamily' => isset( $settings_json['fontFamily'] ) && $settings_json['fontFamily'] ? $settings_json['fontFamily'] : '',
			'preview'    => isset( $settings_json['preview'] ) && $settings_json['preview'] ? $settings_json['preview'] : '',
		);
	}
}