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

namespace AutoFileCopyNet.TimerTask
{


    /// <summary>
    /// 定时任务委托方法
    /// </summary>
    public delegate void TimerTaskDelegate();

    /// <summary>
    /// 有参数的定时任务委托方法
    /// </summary>
    public delegate void ParmTimerTaskDelegate(object[] parm);



    public class TimerTaskService
    {
        #region  定时任务实例成员
        private TimerInfo timerInfo;  //定时信息
        private DateTime NextRunTime;  //下一次执行时间
        private TimerTaskDelegate TimerTaskDelegateFun = null; //执行具体任务的委托方法
        private ParmTimerTaskDelegate ParmTimerTaskDelegateFun = null; //带参数的执行具体任务的委托方法
        private object[] parm = null; //参数
        private ITimerTask TimerTaskInstance = null; //执行具体任务的实例
        /// <summary>
        /// 根据定时信息构造定时任务服务
        /// </summary>
        /// <param name="_timer"></param>
        private TimerTaskService(TimerInfo _timer)
        {
            timerInfo = _timer;
        }
        /// <summary>
        /// 根据定时信息和执行具体任务的实例构造定时任务服务
        /// </summary>
        /// <param name="_timer">定时信息</param>
        /// <param name="_interface">执行具体任务的实例</param>
        private TimerTaskService(TimerInfo _timer, ITimerTask _interface)
        {
            timerInfo = _timer;
            TimerTaskInstance = _interface;
        }
        /// <summary>
        /// 根据定时信息和执行具体任务的委托方法构造定时任务服务
        /// </summary>
        /// <param name="_timer">定时信息</param>
        /// <param name="trd">执行具体任务的委托方法</param>
        private TimerTaskService(TimerInfo _timer, TimerTaskDelegate trd)
        {
            timerInfo = _timer;
            TimerTaskDelegateFun = trd;
        }
        /// <summary>
        /// 根据定时信息和执行具体任务的委托方法构造定时任务服务
        /// </summary>
        /// <param name="_timer">定时信息</param>
        /// <param name="ptrd">带参数执行具体任务的委托方法</param>
        private TimerTaskService(TimerInfo _timer, ParmTimerTaskDelegate ptrd)
        {
            timerInfo = _timer;
            ParmTimerTaskDelegateFun = ptrd;
        }
        /// <summary>
        /// 设置参数
        /// </summary>
        /// <param name="_parm"></param>
        private void setParm(object[] _parm)
        {
            parm = _parm;
        }

        /// <summary>
        /// 启动定时任务
        /// </summary>
        public void Start()
        {
            //检查定时器
            CheckTimer(timerInfo);
        }

        /// <summary>
        /// 检查定时器
        /// </summary>
        private void CheckTimer(TimerInfo timerInfo)
        {
            //计算下次执行时间
            getNextRunTime();
            while (true)
            {
                DateTime DateTimeNow = DateTime.Now;
                //时间比较
                bool dateComp = DateTimeNow.Year == NextRunTime.Year && DateTimeNow.Month == NextRunTime.Month && DateTimeNow.Day == NextRunTime.Day;
                bool timeComp = DateTimeNow.Hour == NextRunTime.Hour && DateTimeNow.Minute == NextRunTime.Minute && DateTimeNow.Second == NextRunTime.Second;

                //如果当前时间等式下次运行时间,则调用线程执行方法
                if (dateComp && timeComp)
                {
                    //调用执行处理方法
                    if (TimerTaskDelegateFun != null)
                    {
                        TimerTaskDelegateFun();
                    }
                    else if (ParmTimerTaskDelegateFun != null)
                    {
                        ParmTimerTaskDelegateFun(parm);
                    }
                    else if (TimerTaskInstance != null)
                    {
                        TimerTaskInstance.Run();
                    }
                    else
                    {
                        Run();
                    }

                    //重新计算下次执行时间
                    getNextRunTime();
                }
                Thread.Sleep(1000);
            }
        }
        /// <summary>
        /// 执行方法
        /// </summary>
        protected void Run()
        {
            //TODO.....

        }

        /// <summary>
        /// 计算下一次执行时间
        /// </summary>
        /// <returns></returns>
        private void getNextRunTime()
        {
            DateTime now = DateTime.Now;
            int nowHH = now.Hour;
            int nowMM = now.Minute;
            int nowSS = now.Second;
            int timeHH = timerInfo.Hour;
            int timeMM = timerInfo.Minute;
            int timeSS = timerInfo.Second;
            //设置执行时间对当前时间进行比较
            bool nowTimeComp = nowHH < timeHH || (nowHH <= timerInfo.Hour && nowMM < timeMM) || (nowHH <= timerInfo.Hour && nowMM <= timeMM && nowSS < timeSS);

            //每天
            if ("EveryDay".Equals(timerInfo.TimerType))
            {
                if (nowTimeComp)
                {
                    NextRunTime = new DateTime(now.Year, now.Month, now.Day, timeHH, timeMM, timeSS);
                }
                else
                {
                    NextRunTime = new DateTime(now.Year, now.Month, now.Day, timeHH, timeMM, timeSS).AddDays(1);
                }
            }
            //每周一次
            else if ("DayOfWeek".Equals(timerInfo.TimerType))
            {
                DayOfWeek ofweek = DateTime.Now.DayOfWeek;
                int dayOfweek = Convert.ToInt32(DateTime.Now.DayOfWeek);
                if (ofweek == DayOfWeek.Sunday) dayOfweek = 7;
                if (dayOfweek < timerInfo.DateValue)
                {
                    int addDays = timerInfo.DateValue - dayOfweek;
                    NextRunTime = new DateTime(now.Year, now.Month, now.Day, timeHH, timeMM, timeSS).AddDays(addDays);
                }
                else if (dayOfweek == timerInfo.DateValue && nowTimeComp)
                {
                    NextRunTime = new DateTime(now.Year, now.Month, now.Day, timeHH, timeMM, timeSS);
                }
                else
                {
                    int addDays = 7 - (dayOfweek - timerInfo.DateValue);
                    NextRunTime = new DateTime(now.Year, now.Month, now.Day, timeHH, timeMM, timeSS).AddDays(addDays);
                }
            }
            //每月一次
            else if ("DayOfMonth".Equals(timerInfo.TimerType))
            {
                if (now.Day < timerInfo.DateValue)
                {
                    NextRunTime = new DateTime(now.Year, now.Month, timerInfo.DateValue, timeHH, timeMM, timeSS);
                }
                else if (now.Day == timerInfo.DateValue && nowTimeComp)
                {
                    NextRunTime = new DateTime(now.Year, now.Month, now.Day, timeHH, timeMM, timeSS);
                }
                else
                {
                    NextRunTime = new DateTime(now.Year, now.Month, timerInfo.DateValue, timeHH, timeMM, timeSS).AddMonths(1);
                }
            }
            //指定日期
            else if ("DesDate".Equals(timerInfo.TimerType))
            {
                NextRunTime = new DateTime(timerInfo.Year, timerInfo.Month, timerInfo.Day, timeHH, timeMM, timeSS);
            }
            //循环指定天数
            else if ("LoopDays".Equals(timerInfo.TimerType))
            {
                NextRunTime = new DateTime(now.Year, now.Month, now.Day, timeHH, timeMM, timeSS).AddDays(timerInfo.DateValue);
            }
        }

        #endregion

        #region 创建定时任务静态方法
        /// <summary>
        /// 使用委托方法创建定时任务
        /// <param name="info"></param>
        /// <param name="_trd"></param>
        /// <returns></returns>
        public static Thread CreateTimerTaskService(TimerInfo info, TimerTaskDelegate _trd)
        {
            TimerTaskService tus = new TimerTaskService(info, _trd);
            //创建启动线程
            Thread ThreadTimerTaskService = new Thread(new ThreadStart(tus.Start));
            return ThreadTimerTaskService;
        }
        /// <summary>
        ///  使用带参数的委托方法创建定时任务
        /// </summary>
        /// <param name="info"></param>
        /// <param name="_ptrd"></param>
        /// <param name="parm"></param>
        /// <returns></returns>
        public static Thread CreateTimerTaskService(TimerInfo info, ParmTimerTaskDelegate _ptrd, object[] parm)
        {
            TimerTaskService tus = new TimerTaskService(info, _ptrd);
            tus.setParm(parm);
            //创建启动线程
            Thread ThreadTimerTaskService = new Thread(new ThreadStart(tus.Start));
            return ThreadTimerTaskService;
        }
        /// <summary>
        /// 使用实现定时接口ITimerTask的实例创建定时任务
        /// </summary>
        /// <param name="info"></param>
        /// <param name="_ins"></param>
        /// <returns></returns>
        public static Thread CreateTimerTaskService(TimerInfo info, ITimerTask _ins)
        {
            TimerTaskService tus = new TimerTaskService(info, _ins);
            //创建启动线程
            Thread ThreadTimerTaskService = new Thread(new ThreadStart(tus.Start));
            return ThreadTimerTaskService;
        }

        #endregion
    }
}