using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

using UnityEngine;

using XericLibrary.Runtime.Type;

namespace XericLibrary.Runtime.Security
{
	/// <summary>
	/// 基本的保全调用方法；
	/// 需要手动在委托的前后安置保全标识
	/// </summary>
    public class ProgramFlowSecurity : WeaklyObject
	{
		#region 字段属性 

		/// <summary>
		/// 外部保护标志位
		/// </summary>
		private int conservativeFlag;

		/// <summary>
		/// 外部单步标志位
		/// </summary>
		private int DoOnceFlag;

		#endregion

		#region 构造

		public ProgramFlowSecurity()
		{
			conservativeFlag = 0;
			DoOnceFlag = 0;
		}

		#endregion

		#region 外部方法

		/// <summary>
		/// 标志一段程序的开始
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="site"></param>
		public void Start<T>(T site)
		where T : struct, Enum
		{
			conservativeFlag |= Convert.ToInt32(site);
		}

		/// <summary>
		/// 标志一段程序的结束
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="site"></param>
		public void Finish<T>(T site)
		where T : struct, Enum
		{
			conservativeFlag &= ~Convert.ToInt32(site);
		}

		/// <summary>
		/// 尝试开始一段程序
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="site"></param>
		/// <returns></returns>
		public bool TryStart<T>(T site)
		where T : struct, Enum
		{
			if(GetFlag(site))
				return false;
			Start(site);
			return true;
		}

		/// <summary>
		/// 开始执行一次
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="site"></param>
		/// <returns></returns>
		public bool DoOnceStart<T>(T site)
		where T : struct, Enum
		{
			if(GetFlag(site))
				return false;
			DoOnceFlag |= Convert.ToInt32(site);
			return true;
		}

		/// <summary>
		/// 复位执行一次的标志
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="site"></param>
		public void ResetDoOnce<T>(T site)
		where T : struct, Enum
		{
			DoOnceFlag &= ~Convert.ToInt32(site);
		}



		/// <summary>
		/// 获取一段程序的标志位
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="site"></param>
		/// <returns></returns>
		private bool GetFlag<T>(T site)
		where T : struct, Enum
		{
			return (conservativeFlag & Convert.ToInt32(site)) > 0;
		}

		/// <summary>
		/// 获取一段程序的标志位
		/// </summary>
		/// <typeparam name="T"></typeparam>
		/// <param name="site"></param>
		/// <returns></returns>
		private bool GetDoOnce<T>(T site)
		where T : struct, Enum
		{
			return (DoOnceFlag & Convert.ToInt32(site)) > 0;
		}



		#endregion
	}
}