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

namespace IoTIntegrationPlatform.Common
{
    /// <summary>
    /// 时间公共类
    /// </summary>
    public static class TimeHelper
    {
        /// <summary>
        /// 相差秒
        /// </summary>
        /// <param name="startTime"></param>
        /// <param name="endTime"></param>
        /// <returns></returns>
        public static double DiffSeconds(DateTime startTime, DateTime endTime)
        {
            TimeSpan secondSpan = new TimeSpan(endTime.Ticks - startTime.Ticks);
            return secondSpan.TotalSeconds;
        }

        /// <summary>
        /// 相差分钟数
        /// </summary>
        /// <param name="startTime"></param>
        /// <param name="endTime"></param>
        /// <returns></returns>
        public static double DiffMinutes(DateTime startTime, DateTime endTime)
        {
            TimeSpan minuteSpan = new TimeSpan(endTime.Ticks - startTime.Ticks);
            return minuteSpan.TotalMinutes;
        }

        /// <summary>
        /// 相差小时
        /// </summary>
        /// <param name="startTime"></param>
        /// <param name="endTime"></param>
        /// <returns></returns>
        public static double DiffHours(DateTime startTime, DateTime endTime)
        {
            TimeSpan hoursSpan = new TimeSpan(endTime.Ticks - startTime.Ticks);
            return hoursSpan.TotalHours;
        }

        /// <summary>
        /// 相差天数
        /// </summary>
        /// <param name="startTime"></param>
        /// <param name="endTime"></param>
        /// <returns></returns>
        public static double DiffDays(DateTime startTime, DateTime endTime)
        {
            TimeSpan daysSpan = new TimeSpan(endTime.Ticks - startTime.Ticks);
            return daysSpan.TotalDays;
        }

        /// <summary>
        /// 相差月数
        /// </summary>
        /// <param name="startTime"></param>
        /// <param name="endTime"></param>
        /// <returns></returns>
        public static double DiffMonths(DateTime startTime, DateTime endTime)
        {
            int months = (endTime.Year - startTime.Year) * 12 + endTime.Month - startTime.Month;
            if (startTime.Day > endTime.Day) months--; // 如果第一个日期的日大于第二个日期的日，则减去一个月  
            return months;
        }

        /// <summary>
        /// 获取当前时间戳
        /// </summary>
        /// <returns></returns>
        public static long GetCurrentTimestamp()
        {
            DateTimeOffset currentTime = DateTimeOffset.Now;
            long timestamp = currentTime.ToUnixTimeSeconds();
            return timestamp;
        }

        /// <summary>
        /// 获取当前时间戳[毫秒]
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static long GetCurrentTimestampTicks()
        {
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            long t = Convert.ToInt64(ts.TotalMilliseconds);
            return t;
        }

        /// <summary>
        /// 时间转时间戳[毫秒]
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static long DateToTimestampTicks(DateTime date)
        {
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));//当地时区
            TimeSpan ts = date - startTime;
            long timestamp = Convert.ToInt64(ts.TotalSeconds);
            return timestamp;
        }

        /// <summary>
        /// 某天的开始
        /// </summary>
        /// <param name="datetime"></param>
        /// <returns></returns>
        public static DateTime DayOfZeroSeconds(DateTime datetime)
        {
            return datetime.AddDays(1 - datetime.Day).Date;
        }

        /// <summary>
        /// 某天的最后一秒
        /// </summary>
        /// <param name="datetime"></param>
        /// <returns></returns>
        public static DateTime DayOfLastSeconds(DateTime datetime)
        {
            return datetime.AddDays(1).AddSeconds(-1);
        }

    }
}