vm.kt

class PostDetailViewModel(private val postsOperations: PostsOperations): ViewModel() {

    private val _postDetailUiModel =
        MutableLiveData<Lce<PostDetailUiModel>>()
    val postDetailUiModel: LiveData<Lce<PostDetailUiModel>>
        get() = _postDetailUiModel

    private var disposable: Disposable? = null

    fun getPostDetail(postUiModel: PostUiModel) {
        if (_postDetailUiModel.value == null) {
            disposable = postsOperations.getPostDetail(postUiModel)
                .observeOn(AndroidSchedulers.mainThread())
                .doOnSubscribe {
                    _postDetailUiModel.value = Lce.Content(
                        PostDetailUiModel(postUiModel.title, postUiModel.body, "", "")
                    )
                    _postDetailUiModel.value = Lce.Loading()
                }
                .subscribe(
                    { postDetailUiModel -> _postDetailUiModel.value = Lce.Content(postDetailUiModel) },
                    { throwable -> _postDetailUiModel.value = Lce.Error(throwable.message ?: "") }
                )
        }
    }

    override fun onCleared() {
        disposable?.dispose()
    }
}