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Src/Unity/Scripts/Entity/Variable/EntityVariable.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using UnityEngine;
+using UnityEngine.Pool;
+
+namespace BITKit.Entities.Variables
+{
+	public interface IVariable
+	{
+		string Variable { get; set; }
+		string[] Variables { get; }
+		event Action<string,string> OnVariableChanged;
+		event Func<string,bool> TryChangeVariable;
+		event Func<string> CollectVariables;
+		
+	}
+    [Serializable]
+	public sealed class IVariableFromDI : InjectFromDI<IVariable>,IVariable
+	{
+		private IVariable _variableImplementation => Value;
+		public string Variable
+		{
+			get => _variableImplementation.Variable;
+			set => _variableImplementation.Variable = value;
+		}
+
+		public string[] Variables => _variableImplementation.Variables;
+
+		public event Action<string, string> OnVariableChanged
+		{
+			add => _variableImplementation.OnVariableChanged += value;
+			remove => _variableImplementation.OnVariableChanged -= value;
+		}
+
+		public event Func<string, bool> TryChangeVariable
+		{
+			add => _variableImplementation.TryChangeVariable += value;
+			remove => _variableImplementation.TryChangeVariable -= value;
+		}
+
+		public event Func<string> CollectVariables
+		{
+			add => _variableImplementation.CollectVariables += value;
+			remove => _variableImplementation.CollectVariables -= value;
+		}
+	}
+
+	[CustomType(typeof(IVariable),true)]
+	public sealed class EntityVariable:MonoBehaviour,IVariable
+	{
+		public string Variable
+		{
+			get => _variable;
+			set
+			{
+				if (TryChangeVariable is null || TryChangeVariable.CastAsFunc().All(Yes))
+				{
+					OnVariableChanged?.Invoke(_variable, _variable = value);
+				}
+
+				return;
+
+				bool Yes(Func<string, bool> arg)
+				{
+					return arg.Invoke(value);
+				}
+			}
+		}
+
+		public string[] Variables {
+			get
+			{
+				if (CollectVariables is null)
+				{
+					return Array.Empty<string>();
+				}
+				var listPool=ListPool<string>.Get();
+				foreach (var x in CollectVariables.CastAsFunc())
+				{
+					listPool.Add(x.Invoke());
+				}		
+				var result = listPool.ToArray();
+				ListPool<string>.Release(listPool);
+				return result;
+			}
+		}
+		public event Action<string,string> OnVariableChanged;
+		public event Func<string,bool> TryChangeVariable;
+		public event Func<string> CollectVariables;
+
+		private string _variable="Default";
+
+		private void Awake()
+		{
+			if (GetType().GetCustomAttribute<CustomTypeAttribute>() is { AsGlobal: true })
+			{
+				DI.Register<IVariable>(this);
+			}
+		}
+	}
+}