Search Tweets UseCase from UseCaseFlow<TweetsUIState>

SearchTweetUseCase.kt

/**
 * Search tweets Use case implementation of [UseCaseStateFlow]
 */
@RetainedScope
class SearchTweetUseCase @Inject constructor(
   private val repository: TweetsRepository,
   @Named("CoroutineScopeTransfer") val coroutineScope: CoroutineScope
) : UseCaseStateFlow<TweetsUIState> {
        
   private val tweetsUIStateFlow = MutableStateFlow<TweetsUIState>(TweetsUIState.InitialIdleUIState)

   override fun getStateFlow(): StateFlow<TweetsUIState> = tweetsUIStateFlow
        
   override fun execute(query: String) {
      repository.searchTweet(query)
         .onStart {
            tweetsUIStateFlow.value = TweetsUIState.LoadingUIState
               }
                  .onEach { tweets ->
                     if (tweets.isEmpty()) {
                        tweetsUIStateFlow.value = TweetsUIState.EmptyUIState
                     } else {
                        tweetsUIStateFlow.value = TweetsUIState.ListResultsUIState(tweets)
                     }
               }.catch { e ->
                  tweetsUIStateFlow.value = TweetsUIState.ErrorUIState
               }.launchIn(coroutineScope)
   }
   //...
}