using System;
using System.Collections.Generic;

namespace BITKit
{
	/// <summary>
	/// 双缓冲区
	/// </summary>
	/// <typeparam name="T"></typeparam>
	public interface IDoubleBuffer<T>
	{
		T Current { get; }
		void Release(T newValue);
		event Action<T> OnRelease;
		bool TryGetRelease(out T result);
	}
	/// <summary>
	/// <see cref="IDoubleBuffer{T}"/>
	/// </summary>
	/// <typeparam name="T"></typeparam>
	public class DoubleBuffer<T> : IDoubleBuffer<T>
	{
		public T Current
		{
			get;
			// ReSharper disable once MemberCanBePrivate.Global
			protected set;
		}

		public void Release(T newValue)
		{
			Current = newValue;
			OnRelease?.Invoke(newValue);
		}

		public event Action<T> OnRelease;
		private readonly Queue<T> _releases = new();

		public bool TryGetRelease(out T result)
		{
			return _releases.TryDequeue(out result);
		}
	}
}