Код-ревью: use case оформления заказа (Swift)

import UIKit
import Alamofire

final class PlaceOrderUseCase {
    let vc: UIViewController

    func execute(cart: CartDTO) async throws -> UIColor {
        guard cart.items.count > 0 else {
            await vc.present(UIAlertController(title: "Пусто", message: nil, preferredStyle: .alert), animated: true)
            return .red
        }
        let response = try await AF.request("https://api.shop.ru/orders", method: .post)
            .serializingDecodable(OrderDTO.self).value
        UserDefaults.standard.set(response.id, forKey: "lastOrder")
        return response.status == "ok" ? .green : .red
    }
}