using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace APT.Infrastructure.Core
{
	public class APTThreadPool
	{
		private static List<APTThreadWork> _workQueues = new List<APTThreadWork>();
		private static List<APTThreadWork> _waiAddWorkQueues = new List<APTThreadWork>();
		private static List<APTThreadWork> _removeList = new List<APTThreadWork>();
		private static bool _isStop = false;
		private static Thread _mainThread = null;
		private static object _mainThreadLockObj = new object();
		private static object _addThreadLockObj = new object();
		private static int MainThreadSleepTime = 10 * 1000;


		public static void Start(bool isMainThreadByBackground=false)
		{
			DoStartThread(isMainThreadByBackground);
		}

		public static void Stop()
		{
			lock (_mainThreadLockObj)
			{
				_isStop = true;
			}
			if (_mainThread != null)
				_mainThread.Abort();
		}
		public static void Stop(APTThreadWork work)
		{
			lock (_mainThreadLockObj)
			{
				_removeList.Add(work);
			}
		}

		public static void AddWorkThread(APTThreadWork work)
		{
			AddWorkThread(DateTime.MinValue, work);
		}
		public static void AddWorkThread(DateTime runTime, APTThreadWork work)
		{
			if (runTime != DateTime.MinValue)
				work.RunTime = runTime;
			lock (_addThreadLockObj)
			{
				_waiAddWorkQueues.Add(work);
			}
		}


		private static void DoStartThread(bool isBackground)
		{
			_mainThread = new Thread(DoThreadWork) { IsBackground = isBackground };
			_mainThread.Start();
		}


		private static void DoThreadWork()
		{
			while (true)
			{
				try
				{
					lock (_mainThreadLockObj)
					{
						if (_removeList != null && _removeList.Count > 0)
						{
							foreach (var item in _removeList)
								_workQueues.Remove(item);
							_removeList.Clear();
						}
					}
					lock (_addThreadLockObj)
					{
						if (_waiAddWorkQueues != null && _waiAddWorkQueues.Count > 0)
							foreach (var item in _waiAddWorkQueues)
								_workQueues.Add(item);
						_waiAddWorkQueues.Clear();
					}
					if (_workQueues != null && _workQueues.Count > 0)
					{
						lock (_mainThreadLockObj)
						{
							DateTime nowTime = DateTime.Now.ToLocalTime();
							foreach (APTThreadWork work in _workQueues)
							{
								if (work == null || work.ThreadState == ThreadState.Running || work.ThreadState == ThreadState.Stop) continue;

								if (_isStop) break;

								DateTime runTime = work.RunTime;
								if (runTime == DateTime.MinValue)
								{
									work.ThreadState = ThreadState.Stop;
									_removeList.Add(work);
									continue;
								}
								if (runTime <= nowTime)
								{
									work.ThreadState = ThreadState.Running;
									ThreadPool.QueueUserWorkItem(new WaitCallback(InternelExecuteWork), work);
								}
							}
							if (_isStop) break;
						}
					}
				}
				catch
				{

				}
				if (_workQueues == null || _workQueues.Count == 0)
					Thread.Sleep(MainThreadSleepTime);
				else
					Thread.Sleep(3*1000);//休眠3秒钟
			}
		}


		private static string _sss = string.Empty;
		public static void InternelExecuteWork(object obj)
		{
			APTThreadWork work = obj as APTThreadWork;
			if (work == null) return;
			try
			{
				DateTime runTime = work.RunTime;
				work.ThreadState = ThreadState.Running;
				work.Execute();
				if (work.NextRunTime(ref runTime))
				{
					work.ThreadState = ThreadState.Wait;
					work.RunTime = runTime;
				}
				else
				{
					work.ThreadState = ThreadState.Stop;
					lock (_mainThreadLockObj)
					{
						_removeList.Add(work);
					}
				}
			}
			catch
			{
				lock (_mainThreadLockObj)
				{
					_removeList.Add(work);
				}
				work.ThreadState = ThreadState.Wait;
			}
		}
	}
}