Remove old circulars if a new circulars list is available

app/src/main/java/net/underdesk/circolapp/viewmodels/CircularLetterViewModel.kt

@@ -56,6 +56,11 @@ class CircularLetterViewModel(application: Application) : AndroidViewModel(appli
                     withContext(Dispatchers.IO) {
                         val newCirculars = fetcher.getCircularsFromServer()
                         if (newCirculars.size != circulars.value?.size ?: true) {
+                            if (newCirculars.size < circulars.value?.size ?: 0) {
+                                AppDatabase.getInstance(getApplication()).circularDao()
+                                    .deleteAll()
+                            }
+
                             AppDatabase.getInstance(getApplication()).circularDao()
                                 .insertAll(newCirculars)
                         }

app/src/main/java/net/underdesk/circolapp/works/PollWork.kt

@@ -100,6 +100,9 @@ class PollWork(appContext: Context, workerParams: WorkerParameters) :
             }
 
             if (newCirculars.size != oldCirculars.size) {
+                val oldCircularsSize =
+                    if (newCirculars.size < oldCirculars.size) 0 else oldCirculars.size
+
                 withContext(Dispatchers.Main) {
                     createNotificationChannel()
 
@@ -107,7 +110,7 @@ class PollWork(appContext: Context, workerParams: WorkerParameters) :
                         .setBigContentTitle(applicationContext.getString(R.string.notification_summary_title))
                         .setSummaryText(applicationContext.getString(R.string.notification_summary))
 
-                    val circularCount = newCirculars.size - oldCirculars.size
+                    val circularCount = newCirculars.size - oldCircularsSize
 
                     for (i in 0 until circularCount) {
                         createNotification(newCirculars[i])
@@ -135,6 +138,11 @@ class PollWork(appContext: Context, workerParams: WorkerParameters) :
                     }
                 }
 
+                if (newCirculars.size < oldCirculars.size) {
+                    AppDatabase.getInstance(applicationContext).circularDao()
+                        .deleteAll()
+                }
+
                 AppDatabase.getInstance(applicationContext).circularDao()
                     .insertAll(newCirculars)
             }