Turns HolidayManager into an entity system, HolidaySystem.

Content.Server/Entry/EntryPoint.cs

@@ -81,7 +81,6 @@ namespace Content.Server.Entry
         {
             base.PostInit();
 
-            IoCManager.Resolve<IHolidayManager>().Initialize();
             IoCManager.Resolve<ISandboxManager>().Initialize();
             IoCManager.Resolve<RecipeManager>().Initialize();
             IoCManager.Resolve<AlertManager>().Initialize();

Content.Server/Holiday/HolidaySystem.cs

@@ -2,8 +2,6 @@ using System;
 using System.Collections.Generic;
 using Content.Server.Chat.Managers;
 using Content.Server.GameTicking;
-using Content.Server.Holiday.Interfaces;
-using Content.Shared;
 using Content.Shared.CCVar;
 using Robust.Shared.Configuration;
 using Robust.Shared.GameObjects;
@@ -13,12 +11,10 @@ using Robust.Shared.ViewVariables;
 
 namespace Content.Server.Holiday
 {
-    // ReSharper disable once ClassNeverInstantiated.Global
+    public class HolidaySystem : EntitySystem
-    public class HolidayManager : IHolidayManager, IEntityEventSubscriber
     {
         [Dependency] private readonly IConfigurationManager _configManager = default!;
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
-        [Dependency] private readonly IEntityManager _entityManager = default!;
         [Dependency] private readonly IChatManager _chatManager = default!;
 
         [ViewVariables]
@@ -27,19 +23,31 @@ namespace Content.Server.Holiday
         [ViewVariables]
         private bool _enabled = true;
 
+        public override void Initialize()
+        {
+            _configManager.OnValueChanged(CCVars.HolidaysEnabled, OnHolidaysEnableChange, true);
+
+            SubscribeLocalEvent<GameRunLevelChangedEvent>(OnRunLevelChanged);
+        }
+
         public void RefreshCurrentHolidays()
         {
             _currentHolidays.Clear();
 
-            if (!_enabled) return;
+            if (!_enabled)
+                return;
 
             var now = DateTime.Now;
 
             foreach (var holiday in _prototypeManager.EnumeratePrototypes<HolidayPrototype>())
             {
-                if(holiday.ShouldCelebrate(now))
+                if (holiday.ShouldCelebrate(now))
+                {
                     _currentHolidays.Add(holiday);
+                }
             }
+
+            RaiseLocalEvent(new HolidaysRefreshedEvent(_currentHolidays));
         }
 
         public void DoGreet()
@@ -71,13 +79,6 @@ namespace Content.Server.Holiday
             return _currentHolidays.Contains(prototype);
         }
 
-        public void Initialize()
-        {
-            _configManager.OnValueChanged(CCVars.HolidaysEnabled, OnHolidaysEnableChange, true);
-
-            _entityManager.EventBus.SubscribeEvent<GameRunLevelChangedEvent>(EventSource.Local, this, OnRunLevelChanged);
-        }
-
         private void OnHolidaysEnableChange(bool enabled)
         {
             _enabled = enabled;
@@ -103,4 +104,17 @@ namespace Content.Server.Holiday
             }
         }
     }
+
+    /// <summary>
+    ///     Event for when the list of currently active holidays has been refreshed.
+    /// </summary>
+    public class HolidaysRefreshedEvent : EntityEventArgs
+    {
+        public readonly IEnumerable<HolidayPrototype> Holidays;
+
+        public HolidaysRefreshedEvent(IEnumerable<HolidayPrototype> holidays)
+        {
+            Holidays = holidays;
+        }
+    }
 }

Content.Server/Holiday/Interfaces/IHolidayManager.cs

@@ -1,14 +0,0 @@
-using System.Collections.Generic;
-
-namespace Content.Server.Holiday.Interfaces
-{
-    public interface IHolidayManager
-    {
-        void Initialize();
-        void RefreshCurrentHolidays();
-        void DoGreet();
-        void DoCelebrate();
-        IEnumerable<HolidayPrototype> GetCurrentHolidays();
-        bool IsCurrentlyHoliday(string holiday);
-    }
-}

Content.Server/IoC/ServerContentIoC.cs

@@ -52,7 +52,6 @@ namespace Content.Server.IoC
             IoCManager.Register<IAdminManager, AdminManager>();
             IoCManager.Register<IDeviceNetwork, DeviceNetwork.DeviceNetwork>();
             IoCManager.Register<EuiManager, EuiManager>();
-            IoCManager.Register<IHolidayManager, HolidayManager>();
             IoCManager.Register<IVoteManager, VoteManager>();
             IoCManager.Register<INpcBehaviorManager, NpcBehaviorManager>();
             IoCManager.Register<IPlayerLocator, PlayerLocator>();

Content.Server/Jobs/GiveItemOnHolidaySpecial.cs

@@ -27,7 +27,7 @@ namespace Content.Server.Jobs
             if (string.IsNullOrEmpty(Holiday) || string.IsNullOrEmpty(Prototype))
                 return;
 
-            if (!IoCManager.Resolve<IHolidayManager>().IsCurrentlyHoliday(Holiday))
+            if (!EntitySystem.Get<HolidaySystem>().IsCurrentlyHoliday(Holiday))
                 return;
 
             var entity = mob.EntityManager.SpawnEntity(Prototype, mob.Transform.Coordinates);