feat(channelGroups): disallow creation of already existing groups

app/src/main/java/com/github/libretube/db/dao/SubscriptionGroupsDao.kt

@@ -11,6 +11,9 @@ interface SubscriptionGroupsDao {
     @Query("SELECT * FROM subscriptionGroups")
     suspend fun getAll(): List<SubscriptionGroup>
 
+    @Query("SELECT EXISTS(SELECT * FROM subscriptionGroups WHERE name = :name)")
+    suspend fun exists(name: String): Boolean
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     suspend fun createGroup(subscriptionGroup: SubscriptionGroup)
 

app/src/main/java/com/github/libretube/ui/sheets/EditChannelGroupSheet.kt

@@ -13,11 +13,13 @@ import com.github.libretube.R
 import com.github.libretube.api.SubscriptionHelper
 import com.github.libretube.api.obj.Subscription
 import com.github.libretube.databinding.DialogEditChannelGroupBinding
+import com.github.libretube.db.DatabaseHolder
 import com.github.libretube.db.obj.SubscriptionGroup
 import com.github.libretube.ui.adapters.SubscriptionGroupChannelsAdapter
 import com.github.libretube.ui.models.SubscriptionsViewModel
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 
 class EditChannelGroupSheet(
@@ -32,7 +34,7 @@ class EditChannelGroupSheet(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
-    ): View? {
+    ): View {
         binding = DialogEditChannelGroupBinding.inflate(layoutInflater)
         binding.groupName.setText(group.name)
 
@@ -92,15 +94,25 @@ class EditChannelGroupSheet(
 
     private fun updateConfirmStatus() {
         with(binding) {
-            val isGroupNameBlank = groupName.text?.isBlank() == true
+            val name = groupName.text.toString()
+            groupName.error = getGroupNameError(name)
 
-            groupName.error = if (isGroupNameBlank) {
+            confirm.isEnabled = groupName.error == null && group.channels.isNotEmpty()
-                requireContext().getString(R.string.group_name_error)
+        }
-            } else {
-                null
     }
 
-            confirm.isEnabled = !isGroupNameBlank && group.channels.isNotEmpty()
+    private fun getGroupNameError(name: String): String? {
-        }
+        if (name.isBlank()) {
+            return getString(R.string.group_name_error_empty)
+        }
+
+        val groupExists = runBlocking(Dispatchers.IO) {
+            DatabaseHolder.Database.subscriptionGroupsDao().exists(name)
+        }
+        if (groupExists) {
+            return getString(R.string.group_name_error_exists)
+        }
+
+        return null
     }
 }

app/src/main/res/values/strings.xml

@@ -406,7 +406,8 @@
     <string name="channel_groups">Channel groups</string>
     <string name="new_group">New</string>
     <string name="group_name">Group name</string>
-    <string name="group_name_error">Please enter a name</string>
+    <string name="group_name_error_empty">Please enter a name</string>
+    <string name="group_name_error_exists">Please choose a name that is unique</string>
     <string name="edit_group">Edit group</string>
     <string name="play_automatically">Play automatically</string>
     <string name="play_automatically_summary">Start playing video automatically when selecting</string>