HomeViewModel.kt

class HomeViewModel @Inject constructor(
    private val homeRepository: HomeRepository
) : ViewModel() {

    private val compositeDisposable = CompositeDisposable()

    private val _homeItem = MutableLiveData<Resource<List<HomeItem>>>()
    val homeItem: LiveData<Resource<List<HomeItem>>>
        get() = _homeItem


    fun loadHomeItem() {
        _homeItem.postValue(Resource.loading(null))
        loadCache()
        loadHomeFromApi()
    }

    private fun loadHomeFromApi() {
        addToDisposable(
            homeRepository.getHomeItems()
                .subscribeOn(Schedulers.io())
                .subscribe({
                    _homeItem.postValue(Resource.success(it))
                }, {
                    _homeItem.postValue(Resource.error("Failed to update home", null))
                })
        )
    }

    private fun loadCache() {
        addToDisposable(
            homeRepository.getHomeCache()
                .subscribeOn(Schedulers.io())
                .subscribe({
                    if (!it.isNullOrEmpty()) {
                        _homeItem.postValue(Resource.success(it))
                    }
                }, {})
        )
    }

    private fun addToDisposable(disposable: Disposable) = compositeDisposable.add(disposable)


    override fun onCleared() {
        compositeDisposable.clear()
        super.onCleared()
    }

}