Core/Scenarios: Allow scripts to set instance scenario by id

Port From (https://github.com/TrinityCore/TrinityCore/commit/c7f5696479bb85c8fc7ee0d9fdaeb92e2b32213f)

Source/Game/Maps/Map.cs

@@ -5197,6 +5197,20 @@ namespace Game.Maps
             }
         }
 
+        public void SetInstanceScenario(InstanceScenario scenario)
+        {
+            i_scenario.Reset(); // sends exit packets to all players
+
+            if (scenario != null)
+            {
+                i_scenario = scenario;
+
+                scenario.LoadInstanceData();
+
+                DoOnPlayers(scenario.OnPlayerEnter);
+            }
+        }
+
         public void UpdateInstanceLock(UpdateAdditionalSaveDataEvent updateSaveDataEvent)
         {
             if (i_instanceLock != null)
@@ -5302,8 +5316,6 @@ namespace Game.Maps
 
         public InstanceScenario GetInstanceScenario() { return i_scenario; }
 
-        public void SetInstanceScenario(InstanceScenario scenario) { i_scenario = scenario; }
-
         public InstanceLock GetInstanceLock() { return i_instanceLock; }
 
         InstanceScript i_data;

Source/Game/Maps/MapManager.cs

@@ -82,7 +82,7 @@ namespace Game.Entities
                 map.TrySetOwningGroup(group);
 
             map.CreateInstanceData();
-            map.SetInstanceScenario(Global.ScenarioMgr.CreateInstanceScenario(map, team));
+            map.SetInstanceScenario(Global.ScenarioMgr.CreateInstanceScenarioForTeam(map, team));
             map.InitSpawnGroupState();
 
             if (WorldConfig.GetBoolValue(WorldCfg.InstancemapLoadGrids))

Source/Game/Scenarios/InstanceScenario.cs

@@ -14,16 +14,9 @@ namespace Game.Scenarios
 {
     public class InstanceScenario : Scenario
     {
-        public InstanceScenario(InstanceMap map, ScenarioData scenarioData) : base(map, scenarioData)
-        {
-            LoadInstanceData();
+        public InstanceScenario(InstanceMap map, ScenarioData scenarioData) : base(map, scenarioData) { }
 
-            var players = map.GetPlayers();
-            foreach (var player in players)
-                SendScenarioState(player);
-        }
-
-        void LoadInstanceData()
+        public void LoadInstanceData()
         {
             InstanceScript instanceScript = _map.ToInstanceMap().GetInstanceScript();
             if (instanceScript == null)

Source/Game/Scenarios/ScenarioManager.cs

@@ -14,7 +14,7 @@ namespace Game.Scenarios
     {
         ScenarioManager() { }
 
-        public InstanceScenario CreateInstanceScenario(InstanceMap map, int team)
+        public InstanceScenario CreateInstanceScenarioForTeam(InstanceMap map, int team)
         {
             var dbData = _scenarioDBData.LookupByKey(Tuple.Create(map.GetId(), (byte)map.GetDifficultyID()));
             // No scenario registered for this map and difficulty in the database
@@ -34,11 +34,15 @@ namespace Game.Scenarios
                     break;
             }
 
+            return CreateInstanceScenario(map, scenarioID);
+        }
+
+        InstanceScenario CreateInstanceScenario(InstanceMap map, uint scenarioID)
+        {
             var scenarioData = _scenarioData.LookupByKey(scenarioID);
             if (scenarioData == null)
             {
-                Log.outError(LogFilter.Scenario, "Table `scenarios` contained data linking scenario (Id: {0}) to map (Id: {1}), difficulty (Id: {2}) but no scenario data was found related to that scenario Id.", 
-                    scenarioID, map.GetId(), map.GetDifficultyID());
+                Log.outError(LogFilter.Scenario, $"No scenario data was found related to scenario(Id: {scenarioID}) for map(Id: {map.GetId()}), difficulty(Id: {map.GetDifficultyID()}).");
                 return null;
             }