using System;
using System.Reflection;
using SUISS.Core.Utilities;

namespace SUISSEngine
{
	public abstract class Singleton<T> where T : Singleton<T>, new()
	{
		public Singleton()
		{
		}

		public static T Instance
		{
			get
			{
				if (Singleton<T>._instance == null)
				{
					try
					{
						Singleton<T>._instance = Activator.CreateInstance<T>();
					}
					catch (TargetInvocationException ex)
					{
						throw new Exception("Exception in initializer: " + typeof(T).GetCompatibleTypeInfo().FullName + "\n" + ex.InnerException.ToString());
					}
				}
				return Singleton<T>._instance;
			}
		}

		public static bool IsAvailable
		{
			get
			{
				return Singleton<T>._instance != null;
			}
		}

		private static T _instance;
	}
}