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

/// <summary>
/// 时间管理器
/// </summary>
public class TimeHelper
{
    /// <summary>
    /// 初始时间
    /// </summary>
    private DateTime mInitTime = DateTime.MaxValue;

    /// <summary>
    /// 倍数
    /// </summary>
    private float mSpeed = 1;

    /// <summary>
    /// 总持续毫秒数
    /// </summary>
    private double totalMillsec = 0;

    /// <summary>
    /// 上一次检查时间
    /// </summary>
    private DateTime mLastCheckTime = DateTime.MinValue;

    /// <summary>
    /// 是否暂停
    /// </summary>
    private bool mIsPause = false;

    /// <summary>
    /// 开始计时
    /// </summary>
    public void Start()
    {
        this.mInitTime = DateTime.MinValue;
        this.mSpeed = 1.0f;
        this.totalMillsec = 0;
        this.mLastCheckTime = DateTime.Now;
        this.mIsPause = false;
    }

    /// <summary>
    /// 获取当前时间倍率
    /// </summary>
    /// <returns>倍率值</returns>
    public float GetSpeed()
    {
        return this.mSpeed;
    }

    /// <summary>
    /// 设置时间倍率
    /// </summary>
    /// <param name="val">倍率值</param>
    public void SetSpeed(float val)
    {
        this.mSpeed = val;
    }

    /// <summary>
    /// 暂停计时器
    /// </summary>
    public void Pause()
    {
        this.Update();
        this.mIsPause = true;
    }

    /// <summary>
    /// 继续计时器
    /// </summary>
    public void Continue()
    {
        this.mIsPause = false;
        this.mLastCheckTime = DateTime.Now;
    }

    /// <summary>
    /// 时间刷新
    /// </summary>
    public void Update()
    {
        if (this.mIsPause == true)
        {
            return;
        }

        TimeSpan span = DateTime.Now - this.mLastCheckTime;
        this.totalMillsec += span.TotalMilliseconds * this.mSpeed;
        this.mLastCheckTime = DateTime.Now;
    }

    /// <summary>
    /// 获取当前时间
    /// </summary>
    /// <returns>时间</returns>
    public long Now()
    {
        return (long)this.totalMillsec;
    }
}