<?php
/**
 * REST endpoint for plugin settings.
 *
 * @package Yangra\Conditional
 */

namespace Yangra\Conditional\Rest;

use Yangra\Conditional\Settings;
use WP_REST_Request;
use WP_REST_Response;
use WP_REST_Server;

defined( 'ABSPATH' ) || exit;

/**
 * GET/POST /wp-json/yangra-conditional/v1/settings
 */
class SettingsController {

	const ROUTE_NAMESPACE = 'yangra-conditional/v1';

	/**
	 * Settings storage.
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Constructor.
	 *
	 * @param Settings $settings Settings storage.
	 */
	public function __construct( Settings $settings ) {
		$this->settings = $settings;
	}

	/**
	 * Registers hooks.
	 *
	 * @return void
	 */
	public function register(): void {
		add_action( 'rest_api_init', array( $this, 'register_routes' ) );
	}

	/**
	 * Registers REST routes.
	 *
	 * @return void
	 */
	public function register_routes(): void {
		register_rest_route(
			self::ROUTE_NAMESPACE,
			'/settings',
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_settings' ),
					'permission_callback' => array( $this, 'can_manage' ),
				),
				array(
					'methods'             => WP_REST_Server::EDITABLE,
					'callback'            => array( $this, 'update_settings' ),
					'permission_callback' => array( $this, 'can_manage' ),
				),
			)
		);
	}

	/**
	 * Only administrators may read or change settings.
	 *
	 * @return bool
	 */
	public function can_manage(): bool {
		return current_user_can( 'manage_options' );
	}

	/**
	 * Returns current settings.
	 *
	 * @return WP_REST_Response
	 */
	public function get_settings(): WP_REST_Response {
		return new WP_REST_Response( $this->settings->all() );
	}

	/**
	 * Saves settings from the request body. Unknown keys are dropped by Settings::sanitize().
	 *
	 * @param WP_REST_Request $request Request.
	 * @phpstan-param WP_REST_Request<array<string, mixed>> $request
	 * @return WP_REST_Response
	 */
	public function update_settings( WP_REST_Request $request ): WP_REST_Response {
		return new WP_REST_Response( $this->settings->update( $request->get_params() ) );
	}
}