using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Linq;
using NetLibrary.Log;

namespace NetLibrary
{
    public class TimeTask
    {
        public List<TaskModel> ListModel = new List<TaskModel>();
        private AutoResetEvent AutoReset = new AutoResetEvent(false);
        bool IsRun = false;

        TaskModel cTask = null; //当前任务

        #region 启动任务
        public void Start()
        {
            cTask = null;
            if (ListModel.Count == 0) return;
            Thread t1 = new Thread(new ThreadStart(this.OnStart));
            t1.Name = "定时任务";
            t1.Start();
        }
        #endregion
        #region 停止任务
        public void Stop()
        {
            IsRun = false;
            AutoReset.Set();
        }
        #endregion
        #region 计算下一个任务
        public void MathNextTask()
        {
            if (cTask != null)
            {
                if (cTask.Interval == 0)
                {
                    ListModel.Remove(cTask);
                    if (ListModel.Count == 0)
                    {
                        cTask = null;
                        Stop();
                        return;
                    }
                    if (ListModel.Count == 1) cTask = ListModel[0];
                    return;
                }
                else
                {
                    cTask.NextTime = cTask.NextTime.AddMinutes(cTask.Interval);
                }
                //ErrorFollow.TraceWrite("下次执行任务时间", "", cTask.NextTime.ToString("yyyy-MM-dd HH:mm:00"));
            }
            if (ListModel.Count == 1)
            {
                if (cTask==null) cTask = ListModel[0];
                return;
            }
            var query = from item in ListModel
                        orderby item.NextTime ascending
                        select item;
            cTask = query.First();
            //foreach (TaskModel item in ListModel)
            //{
            //    if (cTask == null) { cTask = item; }
            //    else
            //    {
            //        if (item.NextTime < cTask.NextTime) cTask = item;
            //    }
            //}
        }
        #endregion
        #region 睡眠
        public void WaitOne()
        {
            if (cTask == null) return;
            if (cTask.NextTime<DateTime.Now)return;
            TimeSpan ts =cTask.NextTime - DateTime.Now;
            if (IsRun == true && ts.TotalSeconds>0) AutoReset.WaitOne(ts, false);
        }
        #endregion
        #region 执行任务
        void OnStart()
        {
            IsRun = true;
            MathNextTask();
            WaitOne();
            while (IsRun)
            {
                cTask.RunTask(cTask);
                MathNextTask();
                WaitOne();
            }
        }
        #endregion
        #region 关机
        public void CloseWindows(DateTime dt)
        {
            IsRun = true;
            Action<DateTime> hand = new Action<DateTime>(this.CloseWindows_Action);
            hand.BeginInvoke(dt, null, null);
        }
        void CloseWindows_Action(DateTime dt)
        {
            TimeSpan ts = dt - DateTime.Now;
            if (ts.TotalSeconds < 1) return;
            AutoReset.WaitOne(ts, true);
            if (IsRun == false) return;
            SystemInfo.CloseWindows();
        }
        #endregion
        


    }

    public class TaskModel
    {
        public Action<TaskModel> RunTask = null;
        public DateTime NextTime = DateTime.Today;
        /// <summary>
        /// 间隔时间(分钟)
        /// </summary>
        public int Interval = 0; 
        public object CustomModel = null;
    }
}