Dynamic Creature/Go spawning

Port From (https://github.com/TrinityCore/TrinityCore/commit/03b125e6d1947258316c931499746696a95aded2)

Source/Game/Server/WorldManager.cs

@@ -49,6 +49,7 @@ namespace Game
             _realm = new Realm();
 
             _worldUpdateTime = new WorldUpdateTime();
+            _warnShutdownTime = Time.UnixTime;
         }
 
         public Player FindPlayerInZone(uint zone)
@@ -92,6 +93,61 @@ namespace Game
             return m_motd;
         }
 
+        public void TriggerGuidWarning()
+        {
+            // Lock this only to prevent multiple maps triggering at the same time
+            lock (_guidAlertLock)
+            {
+                long gameTime = GameTime.GetGameTime();
+                long today = (gameTime / Time.Day) * Time.Day;
+
+                // Check if our window to restart today has passed. 5 mins until quiet time
+                while (gameTime >= (today + (WorldConfig.GetIntValue(WorldCfg.RespawnRestartQuietTime) * Time.Hour) - 1810))
+                    today += Time.Day;
+
+                // Schedule restart for 30 minutes before quiet time, or as long as we have
+                _warnShutdownTime = today + (WorldConfig.GetIntValue(WorldCfg.RespawnRestartQuietTime) * Time.Hour) - 1800;
+
+                _guidWarn = true;
+                SendGuidWarning();
+            }
+        }
+
+        public void TriggerGuidAlert()
+        {
+            // Lock this only to prevent multiple maps triggering at the same time
+            lock (_guidAlertLock)
+            {
+                DoGuidAlertRestart();
+                _guidAlert = true;
+                _guidWarn = false;
+            }
+        }
+
+        void DoGuidWarningRestart()
+        {
+            if (m_ShutdownTimer != 0)
+                return;
+
+            ShutdownServ(1800, ShutdownMask.Restart, ShutdownExitCode.Restart);
+            _warnShutdownTime += Time.Hour;
+        }
+
+        void DoGuidAlertRestart()
+        {
+            if (m_ShutdownTimer != 0)
+                return;
+
+            ShutdownServ(300, ShutdownMask.Restart, ShutdownExitCode.Restart, _alertRestartReason);
+        }
+
+        void SendGuidWarning()
+        {
+            if (m_ShutdownTimer == 0 && _guidWarn && WorldConfig.GetIntValue(WorldCfg.RespawnGuidWarningFrequency) > 0)
+                SendServerMessage(ServerMessageType.String, _guidWarningMsg);
+            _warnDiff = 0;
+        }
+
         public WorldSession FindSession(uint id)
         {
             return m_sessions.LookupByKey(id);
@@ -527,6 +583,9 @@ namespace Game
             Log.outInfo(LogFilter.ServerLoading, "Loading Creature Base Stats...");
             Global.ObjectMgr.LoadCreatureClassLevelStats();
 
+            Log.outInfo(LogFilter.ServerLoading, "Loading Spawn Group Templates...");
+            Global.ObjectMgr.LoadSpawnGroupTemplates();
+
             Log.outInfo(LogFilter.ServerLoading, "Loading Creature Data...");
             Global.ObjectMgr.LoadCreatures();
 
@@ -543,7 +602,10 @@ namespace Game
             Global.ObjectMgr.LoadCreatureAddons();
 
             Log.outInfo(LogFilter.ServerLoading, "Loading GameObjects...");
-            Global.ObjectMgr.LoadGameobjects();
+            Global.ObjectMgr.LoadGameObjects();
+
+            Log.outInfo(LogFilter.ServerLoading, "Loading Spawn Group Data...");
+            Global.ObjectMgr.LoadSpawnGroups();
 
             Log.outInfo(LogFilter.ServerLoading, "Loading GameObject Addon Data...");
             Global.ObjectMgr.LoadGameObjectAddons();                          // must be after LoadGameObjectTemplate() and LoadGameobjects()
@@ -1083,6 +1145,9 @@ namespace Game
             m_visibility_notify_periodInInstances = ConfigMgr.GetDefaultValue("Visibility.Notify.Period.InInstances", SharedConst.DefaultVisibilityNotifyPeriod);
             m_visibility_notify_periodInBGArenas = ConfigMgr.GetDefaultValue("Visibility.Notify.Period.InBGArenas", SharedConst.DefaultVisibilityNotifyPeriod);
 
+            _guidWarningMsg = WorldConfig.GetDefaultValue("Respawn.WarningMessage", "There will be an unscheduled server restart at 03:00. The server will be available again shortly after.");
+            _alertRestartReason = WorldConfig.GetDefaultValue("Respawn.AlertRestartReason", "Urgent Maintenance");
+
             string dataPath = ConfigMgr.GetDefaultValue("DataDir", "./");
             if (reload)
             {
@@ -1332,6 +1397,16 @@ namespace Game
             // update the instance reset times
             Global.InstanceSaveMgr.Update();
 
+            // Check for shutdown warning
+            if (_guidWarn && !_guidAlert)
+            {
+                _warnDiff += diff;
+                if (GameTime.GetGameTime() >= _warnShutdownTime)
+                    DoGuidWarningRestart();
+                else if (_warnDiff > WorldConfig.GetIntValue(WorldCfg.RespawnGuidWarningFrequency) * Time.InMilliseconds)
+                    SendGuidWarning();
+            }
+
             Global.ScriptMgr.OnWorldUpdate(diff);
         }
 
@@ -2288,6 +2363,9 @@ namespace Game
         public CleaningFlags GetCleaningFlags() { return m_CleaningFlags; }
         public void SetCleaningFlags(CleaningFlags flags) { m_CleaningFlags = flags; }
 
+        public bool IsGuidWarning() { return _guidWarn; }
+        public bool IsGuidAlert() { return _guidAlert; }
+
         public WorldUpdateTime GetWorldUpdateTime() { return _worldUpdateTime; }
 
         #region Fields
@@ -2349,6 +2427,16 @@ namespace Game
         string _dataPath;
 
         WorldUpdateTime _worldUpdateTime;
+
+        string _guidWarningMsg;
+        string _alertRestartReason;
+
+        object _guidAlertLock = new object();
+
+        bool _guidWarn;
+        bool _guidAlert;
+        uint _warnDiff;
+        long _warnShutdownTime;
         #endregion
     }