Delete Thread in Realm if it's empty and we're trying to display it in ThreadsList

app/src/main/java/com/infomaniak/mail/data/cache/mailboxContent/RefreshController.kt

@@ -102,6 +102,9 @@ class RefreshController @Inject constructor(
         setupConfiguration(refreshMode, mailbox, folder, realm, okHttpClient, callbacks)
 
         return refreshWithRunCatching(refreshThreadsJob!!).also { (threads, _) ->
+
+            ThreadController.deleteEmptyThreadsInFolder(folder.id, realm)
+
             if (threads != null) {
                 onStop?.invoke()
                 SentryLog.d("API", "End of refreshing threads with mode: $refreshMode | (${folder.displayForSentry()})")

app/src/main/java/com/infomaniak/mail/data/cache/mailboxContent/ThreadController.kt

@@ -28,6 +28,7 @@ import com.infomaniak.mail.data.models.thread.Thread.ThreadFilter
 import com.infomaniak.mail.di.IoDispatcher
 import com.infomaniak.mail.utils.ErrorCode
 import com.infomaniak.mail.utils.SearchUtils.Companion.convertToSearchThreads
+import com.infomaniak.mail.utils.SentryDebug
 import io.realm.kotlin.MutableRealm
 import io.realm.kotlin.Realm
 import io.realm.kotlin.TypedRealm
@@ -159,6 +160,12 @@ class ThreadController @Inject constructor(
             }
         }
     }
+
+    fun deleteThread(threadUid: String) {
+        mailboxContentRealm().writeBlocking {
+            delete(getThreadQuery(threadUid, realm = this))
+        }
+    }
     //endregion
 
     companion object {
@@ -208,6 +215,12 @@ class ThreadController @Inject constructor(
         private fun getThreadQuery(uid: String, realm: TypedRealm): RealmSingleQuery<Thread> {
             return realm.query<Thread>("${Thread::uid.name} == $0", uid).first()
         }
+
+        private fun getEmptyThreadsInFolderQuery(folderId: String, realm: TypedRealm): RealmQuery<Thread> {
+            val noMessages = "${Thread::messages.name}.@size == $0"
+            return FolderController.getFolder(folderId, realm)?.threads?.query(noMessages, 0)
+                ?: realm.query<Thread>("$noMessages AND ${Thread::folderId.name} == $1", 0, folderId)
+        }
         //endregion
 
         //region Get data
@@ -319,7 +332,22 @@ class ThreadController @Inject constructor(
         }
 
         fun deleteSearchThreads(realm: MutableRealm) = with(realm) {
-            delete(query<Thread>("${Thread::isFromSearch.name} == true").find())
+            delete(query<Thread>("${Thread::isFromSearch.name} == true"))
+        }
+
+        fun deleteEmptyThreadsInFolder(folderId: String, realm: Realm) {
+            realm.writeBlocking {
+                val emptyThreadsQuery = getEmptyThreadsInFolderQuery(folderId, realm = this)
+                val emptyThreads = emptyThreadsQuery.find()
+                // TODO: Find why we are sometimes displaying empty Threads, and fix it instead of just deleting them.
+                //  It's possibly because we are out of sync, and the situation will resolve by itself shortly?
+                if (emptyThreads.isNotEmpty()) {
+                    emptyThreads.forEach {
+                        SentryDebug.sendEmptyThread(it, "No Message in a Thread when refreshing a Folder")
+                    }
+                    delete(emptyThreadsQuery)
+                }
+            }
         }
 
         private fun verifyAttachmentsValues(hasAttachmentsInThread: Boolean, messages: List<Message>, realm: MutableRealm) {

app/src/main/java/com/infomaniak/mail/data/models/thread/Thread.kt

@@ -228,8 +228,9 @@ class Thread : RealmObject {
 
     }.getOrElse { throwable ->
         Sentry.withScope { scope ->
-            scope.setExtra("thread.folder.role", "${folder.role?.name}")
+            scope.setExtra("thread.folder.role", folder.role?.name.toString())
             scope.setExtra("thread.folder.id", folder.id)
+            scope.setExtra("thread.folderId", folderId)
             scope.setExtra("thread.uid", uid)
             scope.setExtra("thread.messages.count", "${messages.count()}")
             scope.setExtra("thread.duplicates.count", "${duplicates.count()}")

app/src/main/java/com/infomaniak/mail/ui/MainViewModel.kt

@@ -1047,6 +1047,10 @@ class MainViewModel @Inject constructor(
         snackbarManager.postValue(appContext.getString(snackbarTitleRes))
     }
 
+    fun deleteThreadInRealm(threadUid: String) = viewModelScope.launch(ioCoroutineContext) {
+        threadController.deleteThread(threadUid)
+    }
+
     private fun shouldAutoAdvance(message: Message?, threadsUids: List<String>): Boolean {
         val isWorkingWithThread = message == null
         return isWorkingWithThread || threadHasOnlyOneMessageLeftInCurrentFolder(threadsUids.first())

app/src/main/java/com/infomaniak/mail/ui/main/folder/ThreadListAdapter.kt

@@ -60,6 +60,7 @@ import com.infomaniak.mail.ui.main.folder.ThreadListAdapter.ThreadListViewHolder
 import com.infomaniak.mail.ui.main.thread.SubjectFormatter
 import com.infomaniak.mail.ui.main.thread.SubjectFormatter.TagColor
 import com.infomaniak.mail.utils.RealmChangesBinding
+import com.infomaniak.mail.utils.SentryDebug
 import com.infomaniak.mail.utils.Utils.runCatchingRealm
 import com.infomaniak.mail.utils.extensions.*
 import dagger.hilt.android.qualifiers.ActivityContext
@@ -191,6 +192,15 @@ class ThreadListAdapter @Inject constructor(
 
     private fun CardviewThreadItemBinding.displayThread(thread: Thread, position: Int) {
 
+        // If we are trying to display an empty Thread, don't. Just delete it.
+        if (thread.messages.isEmpty()) {
+            // TODO: Find why we are sometimes displaying empty Threads, and fix it instead of just deleting them.
+            //  It's possibly because we are out of sync, and the situation will resolve by itself shortly?
+            threadListAdapterCallback?.deleteThreadInRealm?.invoke(thread.uid)
+            SentryDebug.sendEmptyThread(thread, "No Message in the Thread when displaying it in ThreadList")
+            return
+        }
+
         refreshCachedSelectedPosition(thread.uid, position) // If item changed position, update cached position.
         setupThreadDensityDependentUi()
         displayAvatar(thread)

app/src/main/java/com/infomaniak/mail/ui/main/folder/ThreadListAdapterCallback.kt

@@ -25,4 +25,5 @@ interface ThreadListAdapterCallback {
     var onFlushClicked: ((dialogTitle: String) -> Unit)?
     var onLoadMoreClicked: () -> Unit
     var onPositionClickedChanged: (position: Int, previousPosition: Int) -> Unit
+    var deleteThreadInRealm: (threadUid: String) -> Unit
 }

app/src/main/java/com/infomaniak/mail/ui/main/folder/ThreadListFragment.kt

@@ -322,6 +322,8 @@ class ThreadListFragment : TwoPaneFragment(), SwipeRefreshLayout.OnRefreshListen
                 }
 
                 override var onPositionClickedChanged: (Int, Int) -> Unit = ::updateAutoAdvanceNaturalThread
+
+                override var deleteThreadInRealm: (String) -> Unit = { threadUid -> mainViewModel.deleteThreadInRealm(threadUid) }
             },
             multiSelection = object : MultiSelectionListener<Thread> {
                 override var isEnabled by mainViewModel::isMultiSelectOn
@@ -715,7 +717,7 @@ class ThreadListFragment : TwoPaneFragment(), SwipeRefreshLayout.OnRefreshListen
                     val currentFolder = mainViewModel.currentFolder.value
                     Sentry.withScope { scope ->
                         scope.setExtra("cursor", "$currentFolderCursor")
-                        scope.setExtra("folderRole", "${currentFolder?.role?.name}")
+                        scope.setExtra("folderRole", currentFolder?.role?.name.toString())
                         scope.setExtra("folderThreadsCount", "${currentFolder?.threads?.count()}")
                         Sentry.captureMessage(
                             "Should display threads is true but there are no threads to display",

app/src/main/java/com/infomaniak/mail/ui/main/search/SearchFragment.kt

@@ -172,6 +172,8 @@ class SearchFragment : TwoPaneFragment() {
                 }
 
                 override var onPositionClickedChanged: (Int, Int) -> Unit = ::updateAutoAdvanceNaturalThread
+
+                override var deleteThreadInRealm: (String) -> Unit = { threadUid -> mainViewModel.deleteThreadInRealm(threadUid) }
             },
         )
 

app/src/main/java/com/infomaniak/mail/ui/main/thread/ThreadViewModel.kt

@@ -274,7 +274,7 @@ class ThreadViewModel @Inject constructor(
         appContext.trackUserInfo("nbMessagesInThread", nbMessages)
 
         when (nbMessages) {
-            0 -> SentryDebug.sendEmptyThread(thread)
+            0 -> SentryDebug.sendEmptyThread(thread, "No Message in the Thread when opening it")
             1 -> appContext.trackUserInfo("oneMessagesInThread")
             else -> appContext.trackUserInfo("multipleMessagesInThread", nbMessages)
         }

app/src/main/java/com/infomaniak/mail/utils/SentryDebug.kt

@@ -117,14 +117,21 @@ object SentryDebug {
     //region Send Sentry
     // TODO: Added the 04/09/23. It's not supposed to be possible, but we never know…
     //  If this doesn't trigger after a certain amount of time, you can remove it.
-    fun sendEmptyThread(thread: Thread) {
+    //
+    //  Also added in ThreadListAdapter & ThreadController the 04/06/24.
+    fun sendEmptyThread(thread: Thread, message: String) = with(thread) {
         Sentry.withScope { scope ->
-            scope.setExtra("currentUserId", "[${AccountUtils.currentUserId}]")
-            scope.setExtra("currentMailboxEmail", "[${AccountUtils.currentMailboxEmail}]")
-            scope.setExtra("folder.role", thread.folder.role?.name.toString())
-            scope.setExtra("folder.id", thread.folder.id)
-            scope.setExtra("thread.uid", "[${thread.uid}]")
-            Sentry.captureMessage("No Message in the Thread when opening it", SentryLevel.ERROR)
+            scope.setExtra("currentUserId", "${AccountUtils.currentUserId}")
+            scope.setExtra("currentMailboxEmail", AccountUtils.currentMailboxEmail.toString())
+            scope.setExtra("folderId", folderId)
+            scope.setExtra("folder.id", folder.id)
+            scope.setExtra("folder.role", folder.role?.name.toString())
+            scope.setExtra("uid", uid)
+            scope.setExtra("messages.count", "${messages.count()}")
+            scope.setExtra("duplicates.count", "${duplicates.count()}")
+            scope.setExtra("isFromSearch", "$isFromSearch")
+            scope.setExtra("hasDrafts", "$hasDrafts")
+            Sentry.captureMessage(message, SentryLevel.ERROR)
         }
     }