ProgressBarRepository.kt

interface ProgressBarRepository {
    val data: Flow<Int>
    suspend fun startCountDown(count: Int)
}


class ProgressBarRepositoryImpl @Inject constructor() : ProgressBarRepository {
    private val _data: MutableStateFlow<Int?> = MutableStateFlow(null)
    override val data: Flow<Int>
        get() = _data.filterNotNull()

    override suspend fun startCountDown(count: Int) {
        epeat(count) {
            _data.emit(count - it)
            // Delay 1 sec
            delay(1000L)
        }
    }
}