add playlist deletion

app/src/main/java/com/github/libretube/api/PlaylistsHelper.kt

@@ -146,6 +146,32 @@ object PlaylistsHelper {
         )
     }
 
+    suspend fun removeFromPlaylist(playlistId: String, index: Int) {
+        if (!loggedIn()) {
+            val transaction = awaitQuery {
+                DatabaseHolder.Database.localPlaylistsDao().getAll()
+            }.first { it.playlist.id.toString() == playlistId }
+            awaitQuery {
+                DatabaseHolder.Database.localPlaylistsDao().removePlaylistVideo(transaction.videos[index])
+            }
+            if (transaction.videos.size > 1) return
+            // remove thumbnail if playlist now empty
+            awaitQuery {
+                transaction.playlist.thumbnailUrl = ""
+                DatabaseHolder.Database.localPlaylistsDao().updatePlaylist(transaction.playlist)
+            }
+            return
+        }
+
+        RetrofitInstance.authApi.removeFromPlaylist(
+            PreferenceHelper.getToken(),
+            PlaylistId(
+                playlistId = playlistId,
+                index = index
+            )
+        )
+    }
+
     fun getType(): PlaylistType {
         return if (PreferenceHelper.getToken() != "") {
             PlaylistType.PUBLIC

app/src/main/java/com/github/libretube/ui/adapters/PlaylistAdapter.kt

@@ -7,6 +7,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
+import com.github.libretube.api.PlaylistsHelper
 import com.github.libretube.api.RetrofitInstance
 import com.github.libretube.api.obj.PlaylistId
 import com.github.libretube.api.obj.StreamItem
@@ -89,19 +90,9 @@ class PlaylistAdapter(
         }
         CoroutineScope(Dispatchers.IO).launch {
             try {
-                RetrofitInstance.authApi.removeFromPlaylist(
-                    PreferenceHelper.getToken(),
-                    PlaylistId(
-                        playlistId = playlistId,
-                        index = position
-                    )
-                )
+                PlaylistsHelper.removeFromPlaylist(playlistId, position)
             } catch (e: IOException) {
-                println(e)
-                Log.e(TAG(), "IOException, you might not have internet connection")
-                return@launch
-            } catch (e: HttpException) {
-                Log.e(TAG(), "HttpException, unexpected response")
+                Log.e(TAG(), e.toString())
                 return@launch
             }
         }