var currentState = MainActivityUiModel()


private val transformer: ObservableTransformer<UiEvent, MainActivityUiModel> = ObservableTransformer { events ->
        events.publish { shared ->
            Observable.merge(
                    shared.ofType(LoginClick::class.java).compose(loginTransformer),
                    shared.ofType(ForgotPasswordClick::class.java).compose(forgotPasswordTransformer))
                    .scan(currentState, { previous, result -> stateReducer(previous, result) })
        }
}

private fun stateReducer(previousState: MainActivityUiModel, result: Result): ExploreUiModel {
        when (result) {
            is AccountResult -> {
                currentState = previousState.copy(
                        account = result.account,
                        inProgress = result.inProgress, error = result.error)
            }
        }
        return currentState
}