The state of MVI on Android - ReduxKotlin - PostDetailsViewModel

ReduxKotlin-PostDetailsViewModel.kt

class PostDetailsViewModel(
    private val postRepository: PostRepository,
    private val postOverview: PostOverview
) : ViewModel() {

    private val detailsMiddleware = middleware<PostDetailState> { store, next, action ->
        when (action) {
            is ActionTypes.INIT -> store.dispatch(loadDetails(postOverview.id))
            else -> next(action)
        }
    }

    private val detailsReducer: Reducer<PostDetailState> = { state, action ->
        when (action) {
            is PostDetailAction.DataSuccess -> PostDetailState.Details(state.postOverview, action.post)
            PostDetailAction.DataFailure -> PostDetailState.NoDetailsAvailable(state.postOverview)
            else -> state
        }
    }

    fun loadDetails(id: Int): Thunk<PostDetailState> = { dispatch, _, _ ->
        viewModelScope.launch {
            when (val status = postRepository.getDetail(id)) {
                is Status.Success -> dispatch(PostDetailAction.DataSuccess(status.data))
                is Status.Failure -> dispatch(PostDetailAction.DataFailure)
            }
        }
    }

    val store = createThreadSafeStore(
        reducer = detailsReducer,
        preloadedState = PostDetailState.NoDetailsAvailable(postOverview),
        enhancer = applyMiddleware(createThunkMiddleware(), detailsMiddleware)
    )

    init {
        // supposed to trigger automatically
        store.dispatch(ActionTypes.INIT)
    }
}