make the copied playlist name unique

Changelog: changed

app/src/main/java/com/futo/platformplayer/fragment/mainactivity/main/PlaylistFragment.kt

@@ -170,7 +170,14 @@ class PlaylistFragment : MainFragment() {
         }
 
         private fun copyPlaylist(playlist: Playlist) {
-            StatePlaylists.instance.playlistStore.save(playlist.makeCopy())
+            var copyNumber = 1
+            var newName = "${playlist.name} (Copy)"
+            val playlists = StatePlaylists.instance.playlistStore.getItems()
+            while (playlists.any { it.name == newName }) {
+                copyNumber += 1
+                newName = "${playlist.name} (Copy $copyNumber)"
+            }
+            StatePlaylists.instance.playlistStore.save(playlist.makeCopy(newName))
             UIDialogs.toast("Playlist copied")
         }
 

app/src/main/java/com/futo/platformplayer/models/Playlist.kt

@@ -35,8 +35,8 @@ class Playlist {
         this.videos = ArrayList(list);
     }
 
-    fun makeCopy(): Playlist {
-        return Playlist("$name (Copy)", videos)
+    fun makeCopy(newName: String? = null): Playlist {
+        return Playlist(newName ?: name, videos)
     }
 
     companion object {