NoFrameworkLoginByPhonePresenter.kt

interface LoginByPhoneView {
    fun displayState(state: LoginByPhoneState)
}

enum class LoginByPhoneState {
    Request,
    Confirm
}

class LoginByPhonePresenter {

    private var stateToApply: LoginByPhoneState? = null

    private var view: LoginByPhoneView? = null
    fun onViewCreated(view: LoginByPhoneView) {
        this.view = view
        if (stateToApply != null) {
            view.displayState(stateToApply!!)
            stateToApply = null
        }
    }

    fun onViewDestroyed() {
        this.view = null
    }

    fun onRequestCodeClick() {
        launch {
            val code = requestCodeRepository.execute()
            if (view != null) {
                view?.displayState(LoginByPhoneState.Confirm)
            } else {
                stateToApply = LoginByPhoneState.Confirm
            }
        }
    }
}