Core/PacketIO: Handle QueryCountdownTimer

* Add it to battleground
* Base implementation countdowns in Group
* Fix timer sync between groups in battlegrounds
Port From (https://github.com/TrinityCore/TrinityCore/commit/6ed8b5c9077aba788ff5bc51f2652109bfea6175)

Source/Framework/Constants/GroupConst.cs

@@ -166,4 +166,11 @@ namespace Framework.Constants
 
         Max
     }
+
+    public enum CountdownTimerType
+    {
+        Pvp = 0,
+        ChallengeMode = 1,
+        PlayerCountdown = 2
+    }
 }

Source/Framework/Constants/SharedConst.cs

@@ -1888,13 +1888,6 @@ namespace Framework.Constants
         Max
     }
 
-    public enum TimerType
-    {
-        Pvp = 0,
-        ChallengerMode = 1,
-        PlayerCountdown = 2
-    }
-
     public enum GameError : uint
     {
         System = 0,

Source/Game/BattleGrounds/BattleGround.cs

@@ -130,10 +130,7 @@ namespace Game.BattleGrounds
             // Update start time and reset stats timer
             SetElapsedTime(GetElapsedTime() + diff);
             if (GetStatus() == BattlegroundStatus.WaitJoin)
-            {
                 m_ResetStatTimer += diff;
-                m_CountdownTimer += diff;
-            }
 
             PostUpdateImpl(diff);
         }
@@ -278,26 +275,6 @@ namespace Game.BattleGrounds
                 }
             }
 
-            // Send packet every 10 seconds until the 2nd field reach 0
-            if (m_CountdownTimer >= 10000)
-            {
-                uint countdownMaxForBGType = IsArena() ? BattlegroundConst.ArenaCountdownMax : BattlegroundConst.BattlegroundCountdownMax;
-
-                StartTimer timer = new();
-                timer.Type = TimerType.Pvp;
-                timer.TimeLeft = countdownMaxForBGType - (GetElapsedTime() / 1000);
-                timer.TotalTime = countdownMaxForBGType;
-
-                foreach (var guid in GetPlayers().Keys)
-                {
-                    Player player = Global.ObjAccessor.FindPlayer(guid);
-                    if (player != null)
-                        player.SendPacket(timer);
-                }
-
-                m_CountdownTimer = 0;
-            }
-
             if (!m_Events.HasAnyFlag(BattlegroundEventFlags.Event1))
             {
                 m_Events |= BattlegroundEventFlags.Event1;
@@ -316,6 +293,11 @@ namespace Game.BattleGrounds
                     return;
                 }
 
+                _preparationStartTime = GameTime.GetGameTime();
+                foreach (Group group in m_BgRaids)
+                    if (group != null)
+                        group.StartCountdown(CountdownTimerType.Pvp, TimeSpan.FromSeconds((int)StartDelayTimes[BattlegroundConst.EventIdFirst] / 1000), _preparationStartTime);
+
                 StartingEventCloseDoors();
                 SetStartDelayTime(StartDelayTimes[BattlegroundConst.EventIdFirst]);
                 // First start warning - 2 or 1 Minute
@@ -1017,18 +999,8 @@ namespace Game.BattleGrounds
             else
             {
                 if (GetStatus() == BattlegroundStatus.WaitJoin)                 // not started yet
-                {
                     player.CastSpell(player, BattlegroundConst.SpellPreparation, true);   // reduces all mana cost of spells.
 
-                    uint countdownMaxForBGType = IsArena() ? BattlegroundConst.ArenaCountdownMax : BattlegroundConst.BattlegroundCountdownMax;
-                    StartTimer timer = new();
-                    timer.Type = TimerType.Pvp;
-                    timer.TimeLeft = countdownMaxForBGType - (GetElapsedTime() / 1000);
-                    timer.TotalTime = countdownMaxForBGType;
-
-                    player.SendPacket(timer);
-                }
-
                 if (bp.Mercenary)
                 {
                     if (bp.Team == Team.Horde)
@@ -1062,6 +1034,11 @@ namespace Game.BattleGrounds
                 group = new Group();
                 SetBgRaid(team, group);
                 group.Create(player);
+                TimeSpan countdownMaxForBGType = TimeSpan.FromSeconds((int)StartDelayTimes[BattlegroundConst.EventIdFirst] / 1000);
+                if (_preparationStartTime != 0)
+                    group.StartCountdown(CountdownTimerType.Pvp, countdownMaxForBGType, _preparationStartTime);
+                else
+                    group.StartCountdown(CountdownTimerType.Pvp, countdownMaxForBGType);
             }
             else                                            // raid already exist
             {
@@ -1952,7 +1929,6 @@ namespace Game.BattleGrounds
         BattlegroundStatus m_Status;
         uint m_ClientInstanceID;                          // the instance-id which is sent to the client and without any other internal use
         uint m_StartTime;
-        uint m_CountdownTimer;
         uint m_ResetStatTimer;
         uint m_ValidStartPositionTimer;
         int m_EndTime;                                    // it is set to 120000 when bg is ending and it decreases itself
@@ -1994,6 +1970,9 @@ namespace Game.BattleGrounds
         List<uint> _pvpStatIds = new();
 
         List<BattlegroundPlayerPosition> _playerPositions = new();
+
+        // Time when the first message "the battle will begin in 2minutes" is send (or 1m for arenas)
+        long _preparationStartTime;
         #endregion
     }
 

Source/Game/Groups/Group.cs

@@ -1394,6 +1394,25 @@ namespace Game.Groups
             }
         }
 
+        public void StartCountdown(CountdownTimerType timerType, TimeSpan duration, long? startTime = null)
+        {
+            if (timerType < 0 || (int)timerType >= _countdowns.Length)
+                return;
+
+            if (_countdowns[(int)timerType] == null)
+                _countdowns[(int)timerType] = new();
+
+            _countdowns[(int)timerType].StartCountdown(duration, startTime);
+        }
+
+        public CountdownInfo GetCountdownInfo(CountdownTimerType timerType)
+        {
+            if (timerType < 0 || (int)timerType >= _countdowns.Length)
+                return null;
+
+            return _countdowns[(int)timerType];
+        }
+
         public void SetLootMethod(LootMethod method)
         {
             m_lootMethod = method;
@@ -1961,6 +1980,8 @@ namespace Game.Groups
         // Raid markers
         RaidMarker[] m_markers = new RaidMarker[MapConst.RaidMarkersCount];
         uint m_activeMarkers;
+
+        CountdownInfo[] _countdowns = new CountdownInfo[3];
     }
 
     public class MemberSlot
@@ -1986,4 +2007,32 @@ namespace Game.Groups
         public WorldLocation Location;
         public ObjectGuid TransportGUID;
     }
+
+    public class CountdownInfo
+    {
+        long _startTime;
+        long _endTime;
+
+        public long GetTimeLeft()
+        {
+            return Math.Max(_endTime - GameTime.GetGameTime(), 0);
+        }
+
+        public void StartCountdown(TimeSpan duration, long? startTime)
+        {
+            _startTime = startTime.HasValue ? startTime.Value : GameTime.GetGameTime();
+            _endTime = (long)(_startTime + duration.TotalSeconds);
+        }
+
+        public bool IsRunning()
+        {
+            return _endTime > GameTime.GetGameTime();
+        }
+
+        public long GetTotalTime()
+        {
+            return _endTime - _startTime;
+        }
+    }
+
 }

Source/Game/Handlers/MiscHandler.cs

@@ -465,6 +465,25 @@ namespace Game
             SendPacket(splashScreenShowLatest);
         }
 
+        [WorldPacketHandler(ClientOpcodes.QueryCountdownTimer, Processing = PacketProcessing.Inplace)]
+        void HandleQueryCountdownTimer(QueryCountdownTimer queryCountdownTimer)
+        {
+            Group group = _player.GetGroup();
+            if (group == null)
+                return;
+
+            CountdownInfo info = group.GetCountdownInfo(queryCountdownTimer.TimerType);
+            if (info == null)
+                return;
+
+            StartTimer startTimer = new();
+            startTimer.Type = queryCountdownTimer.TimerType;
+            startTimer.TimeLeft = info.GetTimeLeft();
+            startTimer.TotalTime = info.GetTotalTime();
+
+            _player.SendPacket(startTimer);
+        }
+
         [WorldPacketHandler(ClientOpcodes.ChatUnregisterAllAddonPrefixes)]
         void HandleUnregisterAllAddonPrefixes(ChatUnregisterAllAddonPrefixes packet)
         {

Source/Game/Networking/Packets/MiscPackets.cs

@@ -394,7 +394,7 @@ namespace Game.Networking.Packets
         public bool IsTournamentRealm;
         public bool XRealmPvpAlert;
         public bool BlockExitingLoadingScreen;     // when set to true, sending SMSG_UPDATE_OBJECT with CreateObject Self bit = true will not hide loading screen
-                                                    // instead it will be done after this packet is sent again with false in this bit and SMSG_UPDATE_OBJECT Values for player
+                                                   // instead it will be done after this packet is sent again with false in this bit and SMSG_UPDATE_OBJECT Values for player
         public uint? RestrictedAccountMaxLevel;
         public ulong? RestrictedAccountMaxMoney;
         public uint? InstanceGroupSize;
@@ -1156,7 +1156,7 @@ namespace Game.Networking.Packets
             Enable = _worldPacket.HasBit();
         }
 
-       public bool Enable;
+        public bool Enable;
     }
 
     class AccountHeirloomUpdate : ServerPacket
@@ -1277,7 +1277,19 @@ namespace Game.Networking.Packets
 
         public long TotalTime;
         public long TimeLeft;
-        public TimerType Type;
+        public CountdownTimerType Type;
+    }
+
+    class QueryCountdownTimer : ClientPacket
+    {
+        public CountdownTimerType TimerType;
+
+        public QueryCountdownTimer(WorldPacket packet) : base(packet) { }
+
+        public override void Read()
+        {
+            TimerType = (CountdownTimerType)_worldPacket.ReadInt32();
+        }
     }
 
     class ConversationLineStarted : ClientPacket