<?php
/**
 * REST controller for System Status.
 */

namespace IPSCMI\Order\Cart\CoreKit\SystemStatus;

use WP_Error;
use WP_REST_Request;
use WP_REST_Response;
use WP_REST_Server;

defined( 'ABSPATH' ) || exit;

class SystemStatusController {
	private static ?self $instance = null;

	private SystemStatusService $service;

	private function __construct() {
		$this->service = new SystemStatusService();
	}

	public static function instance(): self {
		return self::$instance ??= new self();
	}

	/**
	 * Register REST routes.
	 *
	 * @return void
	 */
	public function register_routes(): void {
		register_rest_route(
			'ipscmi-corekit-system/v1',
			'/status',
			array(
				'methods'             => WP_REST_Server::READABLE,
				'callback'            => array( $this, 'get_status' ),
				'permission_callback' => array( $this, 'can_view' ),
			)
		);

		register_rest_route(
			'ipscmi-corekit-system/v1',
			'/phpinfo',
			array(
				'methods'             => WP_REST_Server::READABLE,
				'callback'            => array( $this, 'get_php_info' ),
				'permission_callback' => array( $this, 'can_view' ),
			)
		);

		register_rest_route(
			'ipscmi-corekit-system/v1',
			'/dbinfo',
			array(
				'methods'             => WP_REST_Server::READABLE,
				'callback'            => array( $this, 'get_db_info' ),
				'permission_callback' => array( $this, 'can_view' ),
			)
		);

		register_rest_route(
			'ipscmi-corekit-system/v1',
			'/logs',
			array(
				'methods'             => WP_REST_Server::READABLE,
				'callback'            => array( $this, 'get_logs' ),
				'permission_callback' => array( $this, 'can_view' ),
			)
		);
	}

	/**
	 * REST callback: return system data.
	 *
	 * @param WP_REST_Request $request Request.
	 *
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_status( WP_REST_Request $request ) {
		$data = $this->service->get_status();

		return rest_ensure_response( $data );
	}

	/**
	 * REST callback: return PHP info (safe subset).
	 *
	 * @param WP_REST_Request $request Request.
	 *
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_php_info( WP_REST_Request $request ) {
		$data = $this->service->get_php_info();

		return rest_ensure_response( $data );
	}

	/**
	 * REST callback: return DB info.
	 *
	 * @param WP_REST_Request $request Request.
	 *
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_db_info( WP_REST_Request $request ) {
		$data = $this->service->get_db_info();

		return rest_ensure_response( $data );
	}

	/**
	 * REST callback: return log metadata.
	 *
	 * @param WP_REST_Request $request Request.
	 *
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_logs( WP_REST_Request $request ) {
		$data = $this->service->get_logs();

		return rest_ensure_response( $data );
	}

	/**
	 * Permission check.
	 *
	 * @return bool
	 */
	public function can_view(): bool {
		$cap = apply_filters( 'ipscmi_corekit_system_status_capability', 'manage_options' );

		return current_user_can( $cap );
	}
}