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

/// <summary>
/// 回调通知函数
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
/// <returns></returns>
public delegate void DispatcherTimerEventHandler(object sender, EventArgs args);

/// <summary>
/// Unity中没有找到主线程Timer，模拟实现
/// </summary>
public class DispatcherTimer : IDisposable
{
    //超过计时器间隔时发生。
    public DispatcherTimerEventHandler Tick = null;

    private string _Name = "未知";
    private bool _Started = false; //是否已经开始
    private long _LastTicks = 0;

    //必须赋值一个特殊的名称，用于监控cpu占用
    public DispatcherTimer(string name)
    {
        _Name = name;
        DispatcherTimerDriver.AddTimer(this);
    }

    /// <summary>
    /// 计时器名称
    /// </summary>
    public string Name {
        get { return _Name; }
        set { _Name = value; }
    }

    private TimeSpan _Interval = TimeSpan.Zero;

    /// <summary>
    /// 设置计时器的时间间隔
    /// </summary>
    public TimeSpan Interval {
        get { return _Interval; }
        set { _Interval = value; }
    }

    /// <summary>
    /// 开始计时器
    /// </summary>
    public void Start()
    {
        _Started = true;
        _LastTicks = DateTime.Now.Ticks;
    }

    /// <summary>
    /// 停止计时器
    /// </summary>
    public void Stop()
    {
        _Started = false;
    }

    /// <summary>
    /// 执行与释放或重置非托管资源相关的应用程序定义的任务
    /// </summary>
    public void Dispose()
    {
        DispatcherTimerDriver.RemoveTimer(this);
    }

    /// <summary>
    /// 执行timer
    /// </summary>
    public void ExecuteTimer()
    {
        long ticks = DateTime.Now.Ticks;
        if (ticks - _LastTicks < _Interval.Ticks)
        {
            return;
        }

        _LastTicks = ticks;

        if (null != Tick)
        {
            long startTicks = DateTime.Now.Ticks / 10000;

            Tick(this, EventArgs.Empty);

            long elapsedTicks = (DateTime.Now.Ticks / 10000) - startTicks;
            if (elapsedTicks >= 100)
            {
                ////DesignDebug.Log("DispatcherTimer.ExecuteTimer, Name=" + _Name + ", Used ticks=" + elapsedTicks);
            }
        }
    }
}