Make random a bit less random, but already sung songs shouldn't be suggested frequently.

PartyModes/PartyModeChallengeMedley/CPartyModeChallengeMedley.cs

@@ -513,12 +513,18 @@ namespace VocaluxeLib.PartyModes.ChallengeMedley
                 return false;
             }
 
+            //Calc avarage sing-count
+            int totalCounts = 0;
+            foreach (CSong song in visibleSongs)
+                totalCounts += song.NumPlayedSession;
+            int averageCount = totalCounts / visibleSongs.Count;
+
             // ReSharper disable LoopCanBeConvertedToQuery
             foreach (CSong song in visibleSongs)
             {
                 foreach (EGameMode mode in song.AvailableGameModes)
                 {
-                    if (mode == EGameMode.TR_GAMEMODE_MEDLEY)
+                    if (mode == EGameMode.TR_GAMEMODE_MEDLEY && song.NumPlayedSession <= averageCount)
                         ids.Add(song.ID);
                 }
             }

Vocaluxe/Base/CSongs.cs

@@ -217,7 +217,20 @@ namespace Vocaluxe.Base
         public static void UpdateRandomSongList()
         {
             _SongsForRandom.Clear();
-            _SongsForRandom.AddRange(VisibleSongs);
+            //Calc avarage sing-count
+            int totalCounts = 0;
+            foreach (CSong song in VisibleSongs)
+                totalCounts += song.NumPlayedSession;
+            int averageCount = totalCounts / NumSongsVisible;
+
+            foreach(CSong song in VisibleSongs)
+            {
+                if (song.NumPlayedSession <= averageCount)
+                    _SongsForRandom.Add(song);
+            }
+            
+            if(_SongsForRandom.Count == 0)
+                _SongsForRandom.AddRange(VisibleSongs);
         }
 
         public static int GetRandomCategory()

Vocaluxe/Screens/CScreenScore.cs

@@ -409,6 +409,7 @@ namespace Vocaluxe.Screens
                         CSong song = CSongs.GetSong(players[p].SongID);
                         CDataBase.IncreaseSongCounter(song.DataBaseSongID);
                         song.NumPlayed++;
+                        song.NumPlayedSession++;
                         break;
                     }
                 }

VocaluxeLib/Songs/CSong.cs

@@ -174,6 +174,7 @@ namespace VocaluxeLib.Songs
         public int DataBaseSongID = -1;
         public string DateAdded = "";
         public int NumPlayed;
+        public int NumPlayedSession;
 
         // Notes
         public readonly CNotes Notes = new CNotes();
@@ -266,6 +267,7 @@ namespace VocaluxeLib.Songs
             DataBaseSongID = song.DataBaseSongID;
             DateAdded = song.DateAdded;
             NumPlayed = song.NumPlayed;
+            NumPlayedSession = song.NumPlayedSession;
 
             Notes = new CNotes(song.Notes);
         }