Holiday System (#3122)

Content.Server/Holiday/Interfaces/IHolidayCelebrate.cs

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+using Robust.Shared.Serialization;
+
+namespace Content.Server.Holiday.Interfaces
+{
+    public interface IHolidayCelebrate : IExposeData
+    {
+        void IExposeData.ExposeData(ObjectSerializer serializer) {}
+
+        /// <summary>
+        ///     This method is called before a round starts.
+        ///     Use it to do any fun festive modifications.
+        /// </summary>
+        void Celebrate(HolidayPrototype holiday);
+    }
+}

Content.Server/Holiday/Interfaces/IHolidayGreet.cs

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+using Robust.Shared.Serialization;
+
+namespace Content.Server.Holiday.Interfaces
+{
+    public interface IHolidayGreet : IExposeData
+    {
+        void IExposeData.ExposeData(ObjectSerializer serializer) { }
+        string Greet(HolidayPrototype holiday);
+    }
+}

Content.Server/Holiday/Interfaces/IHolidayManager.cs

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+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/Holiday/Interfaces/IHolidayShouldCelebrate.cs

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+using System;
+using Robust.Shared.Serialization;
+
+namespace Content.Server.Holiday.Interfaces
+{
+    public interface IHolidayShouldCelebrate : IExposeData
+    {
+        void IExposeData.ExposeData(ObjectSerializer serializer) {}
+        bool ShouldCelebrate(DateTime date, HolidayPrototype holiday);
+    }
+}