using System;
using System.Diagnostics;
using System.Globalization;

namespace DG.Tool
{
    /// <summary>
    /// 时间类
    /// 1、SecondToMinute(int Second) 把秒转换成分钟
    /// </summary>
    public class TimeHelper
    {
        #region Stopwatch计时器

        /// <summary>
        /// 计时器开始
        /// </summary>
        /// <returns></returns>
        public static Stopwatch TimerStart()
        {
            Stopwatch watch = new Stopwatch();
            watch.Reset();
            watch.Start();
            return watch;
        }

        /// <summary>
        /// 计时器结束
        /// </summary>
        /// <param name="watch"></param>
        /// <returns></returns>
        public static string TimerEnd(Stopwatch watch)
        {
            watch.Stop();
            double costtime = watch.ElapsedMilliseconds;
            return costtime.ToString();
        }

        #endregion Stopwatch计时器

        //返回每月的第一天和最后一天
        public static void ReturnDateFormat(int month, out string firstDay, out string lastDay)
        {
            int year = DateTime.Now.Year + month / 12;
            if (month != 12)
            {
                month = month % 12;
            }
            switch (month)
            {
                case 1:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-0" + month + "-31");
                    break;

                case 2:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    if (DateTime.IsLeapYear(DateTime.Now.Year))
                        lastDay = DateTime.Now.ToString(year + "-0" + month + "-29");
                    else
                        lastDay = DateTime.Now.ToString(year + "-0" + month + "-28");
                    break;

                case 3:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString("yyyy-0" + month + "-31");
                    break;

                case 4:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-0" + month + "-30");
                    break;

                case 5:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-0" + month + "-31");
                    break;

                case 6:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-0" + month + "-30");
                    break;

                case 7:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-0" + month + "-31");
                    break;

                case 8:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-0" + month + "-31");
                    break;

                case 9:
                    firstDay = DateTime.Now.ToString(year + "-0" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-0" + month + "-30");
                    break;

                case 10:
                    firstDay = DateTime.Now.ToString(year + "-" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-" + month + "-31");
                    break;

                case 11:
                    firstDay = DateTime.Now.ToString(year + "-" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-" + month + "-30");
                    break;

                default:
                    firstDay = DateTime.Now.ToString(year + "-" + month + "-01");
                    lastDay = DateTime.Now.ToString(year + "-" + month + "-31");
                    break;
            }
        }

        /// <summary>
        /// 将时间格式化成 年月日 的形式,如果时间为null，返回当前系统时间
        /// </summary>
        /// <param name="dt">年月日分隔符</param>
        /// <param name="Separator"></param>
        /// <returns></returns>
        public string GetFormatDate(DateTime dt, char Separator)
        {
            if (dt != null && !dt.Equals(DBNull.Value))
            {
                string tem = string.Format("yyyy{0}MM{1}dd", Separator, Separator);
                return dt.ToString(tem);
            }
            else
            {
                return GetFormatDate(DateTime.Now, Separator);
            }
        }

        /// <summary>
        /// 将时间格式化成 时分秒 的形式,如果时间为null，返回当前系统时间
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="Separator"></param>
        /// <returns></returns>
        public string GetFormatTime(DateTime dt, char Separator)
        {
            if (dt != null && !dt.Equals(DBNull.Value))
            {
                string tem = string.Format("hh{0}mm{1}ss", Separator, Separator);
                return dt.ToString(tem);
            }
            else
            {
                return GetFormatDate(DateTime.Now, Separator);
            }
        }

        /// <summary>
        /// 把秒转换成分钟
        /// </summary>
        /// <returns></returns>
        public static int SecondToMinute(int Second)
        {
            decimal mm = (decimal)((decimal)Second / (decimal)60);
            return Convert.ToInt32(Math.Ceiling(mm));
        }

        #region 返回某年某月最后一天

        /// <summary>
        /// 返回某年某月最后一天
        /// </summary>
        /// <param name="year">年份</param>
        /// <param name="month">月份</param>
        /// <returns>日</returns>
        public static int GetMonthLastDate(int year, int month)
        {
            DateTime lastDay = new DateTime(year, month, new GregorianCalendar().GetDaysInMonth(year, month));
            int Day = lastDay.Day;
            return Day;
        }

        #endregion 返回某年某月最后一天

        #region 返回时间差

        public static string DateDiff(DateTime DateTime1, DateTime DateTime2)
        {
            string dateDiff = null;
            try
            {
                //TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
                //TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
                //TimeSpan ts = ts1.Subtract(ts2).Duration();
                TimeSpan ts = DateTime2 - DateTime1;
                if (ts.Days >= 1)
                {
                    dateDiff = DateTime1.Month.ToString() + "月" + DateTime1.Day.ToString() + "日";
                }
                else
                {
                    if (ts.Hours > 1)
                    {
                        dateDiff = ts.Hours.ToString() + "小时前";
                    }
                    else
                    {
                        dateDiff = ts.Minutes.ToString() + "分钟前";
                    }
                }
            }
            catch
            { }
            return dateDiff;
        }

        #endregion 返回时间差

        #region 获得两个日期的间隔

        /// <summary>
        /// 获得两个日期的间隔
        /// </summary>
        /// <param name="DateTime1">日期一。</param>
        /// <param name="DateTime2">日期二。</param>
        /// <returns>日期间隔TimeSpan。</returns>
        public static TimeSpan DateDiff2(DateTime DateTime1, DateTime DateTime2)
        {
            TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
            TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
            TimeSpan ts = ts1.Subtract(ts2).Duration();
            return ts;
        }

        #endregion 获得两个日期的间隔

        #region 格式化日期时间

        /// <summary>
        /// 格式化日期时间
        /// </summary>
        /// <param name="dateTime1">日期时间</param>
        /// <param name="dateMode">显示模式</param>
        /// <returns>0-9种模式的日期</returns>
        public static string FormatDate(DateTime dateTime1, string dateMode)
        {
            switch (dateMode)
            {
                case "0":
                    return dateTime1.ToString("yyyy-MM-dd");

                case "1":
                    return dateTime1.ToString("yyyy-MM-dd HH:mm:ss");

                case "2":
                    return dateTime1.ToString("yyyy/MM/dd");

                case "3":
                    return dateTime1.ToString("yyyy年MM月dd日");

                case "4":
                    return dateTime1.ToString("MM-dd");

                case "5":
                    return dateTime1.ToString("MM/dd");

                case "6":
                    return dateTime1.ToString("MM月dd日");

                case "7":
                    return dateTime1.ToString("yyyy-MM");

                case "8":
                    return dateTime1.ToString("yyyy/MM");

                case "9":
                    return dateTime1.ToString("yyyy年MM月");

                default:
                    return dateTime1.ToString();
            }
        }

        #endregion 格式化日期时间

        #region 得到随机日期

        /// <summary>
        /// 得到随机日期
        /// </summary>
        /// <param name="time1">起始日期</param>
        /// <param name="time2">结束日期</param>
        /// <returns>间隔日期之间的 随机日期</returns>
        public static DateTime GetRandomTime(DateTime time1, DateTime time2)
        {
            Random random = new Random();
            DateTime minTime = new DateTime();
            DateTime maxTime = new DateTime();

            TimeSpan ts = new TimeSpan(time1.Ticks - time2.Ticks);

            // 获取两个时间相隔的秒数
            double dTotalSecontds = ts.TotalSeconds;
            int iTotalSecontds = 0;

            if (dTotalSecontds > Int32.MaxValue)
            {
                iTotalSecontds = Int32.MaxValue;
            }
            else if (dTotalSecontds < Int32.MinValue)
            {
                iTotalSecontds = Int32.MinValue;
            }
            else
            {
                iTotalSecontds = (int)dTotalSecontds;
            }

            if (iTotalSecontds > 0)
            {
                minTime = time2;
                maxTime = time1;
            }
            else if (iTotalSecontds < 0)
            {
                minTime = time1;
                maxTime = time2;
            }
            else
            {
                return time1;
            }

            int maxValue = iTotalSecontds;

            if (iTotalSecontds <= Int32.MinValue)
                maxValue = Int32.MinValue + 1;

            int i = random.Next(Math.Abs(maxValue));

            return minTime.AddSeconds(i);
        }

        #endregion 得到随机日期

        /// <summary>
        /// DateTime时间格式转换为Unix时间戳格式
        /// </summary>
        /// <param name=”time”></param>
        /// <returns></returns>
        public static int ConvertDateTimeInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }

        /// <summary>
        /// 时间戳转为C#格式时间
        /// </summary>
        /// <param name=”timeStamp”></param>
        /// <returns></returns>
        public static DateTime GetTimeFromLinuxTime(long timeStamp)
        {
            System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0);
            dtDateTime = dtDateTime.AddMilliseconds(timeStamp).ToLocalTime();
            return dtDateTime;
        }
    }
}