Fix restarting count down in disclaimer

app/src/main/java/gq/kirmanak/mealient/ui/disclaimer/DisclaimerViewModel.kt

@@ -5,10 +5,7 @@ import androidx.lifecycle.*
 import dagger.hilt.android.lifecycle.HiltViewModel
 import gq.kirmanak.mealient.data.disclaimer.DisclaimerStorage
 import kotlinx.coroutines.delay
-import kotlinx.coroutines.flow.flow
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
-import kotlinx.coroutines.flow.take
+import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
 import timber.log.Timber
 import java.util.concurrent.TimeUnit
@@ -18,11 +15,12 @@ import javax.inject.Inject
 class DisclaimerViewModel @Inject constructor(
     private val disclaimerStorage: DisclaimerStorage
 ) : ViewModel() {
+
     val isAccepted: LiveData<Boolean>
         get() = disclaimerStorage.isDisclaimerAcceptedFlow.asLiveData()
-
     private val _okayCountDown = MutableLiveData(FULL_COUNT_DOWN_SEC)
     val okayCountDown: LiveData<Int> = _okayCountDown
+    private var isCountDownStarted = false
 
     fun acceptDisclaimer() {
         Timber.v("acceptDisclaimer() called")
@@ -31,9 +29,12 @@ class DisclaimerViewModel @Inject constructor(
 
     fun startCountDown() {
         Timber.v("startCountDown() called")
+        if (isCountDownStarted) return
+        isCountDownStarted = true
         tickerFlow(COUNT_DOWN_TICK_PERIOD_SEC.toLong(), TimeUnit.SECONDS)
             .take(FULL_COUNT_DOWN_SEC - COUNT_DOWN_TICK_PERIOD_SEC + 1)
             .onEach { _okayCountDown.value = FULL_COUNT_DOWN_SEC - it }
+            .onCompletion { isCountDownStarted = false }
             .launchIn(viewModelScope)
     }