Implement friend leaderboards

Refresh.GameServer/Database/GameDatabaseContext.Leaderboard.cs

@@ -60,8 +60,6 @@ public GameSubmittedScore SubmitScore(SerializedScore score, GameUser user, Game
         return newScore;
     }
 
-    [UsedImplicitly] private record ScoreLevelWithPlayer(GameLevel Level, GameUser Player);
-
     public DatabaseList<GameSubmittedScore> GetTopScoresForLevel(GameLevel level, int count, int skip, byte type, bool showDuplicates = false)
     {
         IEnumerable<GameSubmittedScore> scores = this.GameSubmittedScores
@@ -70,7 +68,7 @@ public DatabaseList<GameSubmittedScore> GetTopScoresForLevel(GameLevel level, in
             .AsEnumerable();
 
         if (!showDuplicates)
-            scores = scores.DistinctBy(s => new ScoreLevelWithPlayer(s.Level, s.Players[0]));
+            scores = scores.DistinctBy(s => s.Players[0]);
 
         return new DatabaseList<GameSubmittedScore>(scores, skip, count);
     }
@@ -86,13 +84,30 @@ public IEnumerable<ScoreWithRank> GetRankedScoresAroundScore(GameSubmittedScore
             .AsEnumerable()
             .ToList();
 
-        scores = scores.DistinctBy(s => new ScoreLevelWithPlayer(s.Level, s.Players[0]))
+        scores = scores.DistinctBy(s => s.Players[0])
             .ToList();
 
         return scores.Select((s, i) => new ScoreWithRank(s, i + 1))
             .Skip(Math.Min(scores.Count, scores.IndexOf(score) - count / 2)) // center user's score around other scores
             .Take(count);
     }
+
+    public IEnumerable<ScoreWithRank> GetLevelTopScoresByFriends(GameUser user, GameLevel level, int count, byte type)
+    {
+        IEnumerable<GameUser> mutuals = this.GetUsersMutuals(user);
+
+        IEnumerable<GameSubmittedScore> scores = this.GameSubmittedScores
+            .Where(s => s.ScoreType == type && s.Level == level)
+            .OrderByDescending(s => s.Score)
+            .AsEnumerable()
+            .DistinctBy(s => s.Players[0].UserId)
+            //TODO: THIS CALL IS EXTREMELY INEFFECIENT!!! once we are in postgres land, figure out a way to do this effeciently
+            .Where(s => s.Players.Any(p => p.UserId == user.UserId || mutuals.Contains(p)))
+            .Take(10)
+            .ToList();
+
+        return scores.Select((s, i) => new ScoreWithRank(s, i + 1));
+    }
 
     [Pure]
     [ContractAnnotation("null => null; notnull => canbenull")]

Refresh.GameServer/Endpoints/Game/Levels/LeaderboardEndpoints.cs

@@ -1,6 +1,7 @@
 using System.Diagnostics;
 using Bunkum.Core;
 using Bunkum.Core.Endpoints;
+using Bunkum.Core.Endpoints.Debugging;
 using Bunkum.Core.RateLimit;
 using Bunkum.Core.Responses;
 using Bunkum.Listener.Protocol;
@@ -11,6 +12,7 @@
 using Refresh.GameServer.Types.Levels;
 using Refresh.GameServer.Types.Lists;
 using Refresh.GameServer.Types.Roles;
+using Refresh.GameServer.Types.Scores;
 using Refresh.GameServer.Types.UserData;
 using Refresh.GameServer.Types.UserData.Leaderboard;
 
@@ -66,6 +68,23 @@ public Response GetUserScores(RequestContext context, GameUser user, GameDatabas
 
         return new Response(SerializedMultiLeaderboardResponse.FromOld(multiLeaderboard), ContentType.Xml);
     }
+
+    [GameEndpoint("scoreboard/friends/{slotType}/{id}", HttpMethods.Post, ContentType.Xml)]
+    [RateLimitSettings(RequestTimeoutDuration, MaxRequestAmount, RequestBlockDuration, BucketName)]
+    [NullStatusCode(NotFound)]
+    public SerializedScoreLeaderboardList? GetLevelFriendLeaderboard(
+        RequestContext context, 
+        GameUser user, 
+        GameDatabaseContext database, 
+        string slotType, 
+        int id, 
+        FriendScoresRequest body)
+    {
+        GameLevel? level = database.GetLevelByIdAndType(slotType, id);
+        if (level == null) return null;
+
+        return SerializedScoreLeaderboardList.FromSubmittedEnumerable(database.GetLevelTopScoresByFriends(user, level, 10, body.Type));
+    }
 
     [GameEndpoint("scoreboard/{slotType}/{id}", ContentType.Xml, HttpMethods.Post)]
     [RateLimitSettings(RequestTimeoutDuration, MaxRequestAmount, RequestBlockDuration, BucketName)]

Refresh.GameServer/Types/Scores/FriendScoresRequest.cs

@@ -0,0 +1,13 @@
+using System.Xml.Serialization;
+
+namespace Refresh.GameServer.Types.Scores;
+
+[XmlRoot("playRecord")]
+public class FriendScoresRequest
+{
+    [XmlElement("playerIds")]
+    public List<string> Usernames { get; set; }
+
+    [XmlElement("type")]
+    public byte Type { get; set; }
+}