abstract class BaseFragment<T : ViewDataBinding, K : ViewModel>(@LayoutRes private val layoutId: Int,
                                                                private val modelType : Class<K>) : Fragment() {
    
    //TODO fin a way to extract class type from k generic without needing 
    //TODO to add extra modeType param or requesting extra data

    protected lateinit var viewModel: K
    protected lateinit var binding: T

    protected abstract fun bindViewModel(binding: T, viewModel: K)

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {

        viewModel = ViewModelProviders.of(this).get(modelType)
        binding = DataBindingUtil.bind(container?.inflate(layoutId))

        bindViewModel(binding, viewModel)
        setHasOptionsMenu(true)

        return binding.root
    }
}