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

namespace JwKdsV.Core.Utils
{
    public class DateUtils
    {
        /// <summary>
        /// 获取星期名称
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static string GetWeekName(DateTime date)
        {
            string[] Day = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
            return Day[Convert.ToInt32(DateTime.Now.DayOfWeek.ToString("d"))].ToString();
        }

        public static string GetNowTimeStamp()
        {
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            return Convert.ToInt64(ts.TotalMilliseconds).ToString();
        }

        public static long GetTimeStamp(DateTime dateTime)
        {
            TimeSpan ts = dateTime - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            return Convert.ToInt64(ts.TotalMilliseconds);
        }

        /// <summary>
        /// 毫秒时间戳格式化
        /// </summary>
        /// <param name="timeStamp"></param>
        /// <param name="format"></param>
        /// <returns></returns>
        public static string GetFormatDateTime(string timeStamp, string format = null)
        {
            if (string.IsNullOrEmpty(timeStamp)) return null;
            format = format ?? "yyyy-MM-dd HH:mm:ss";
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); // 当地时区
            DateTime dt = startTime.AddMilliseconds(long.Parse(timeStamp));
            return dt.ToString(format);
        }

        /// <summary>
        /// 秒时间戳格式化
        /// </summary>
        /// <param name="secTimeStamp"></param>
        /// <param name="format"></param>
        /// <returns></returns>
        public static string GetFormatDateTime4Sec(string secTimeStamp, string format = null)
        {
            if (string.IsNullOrEmpty(secTimeStamp)) return null;
            format = format ?? "yyyy-MM-dd HH:mm:ss";
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); // 当地时区
            DateTime dt = startTime.AddSeconds(long.Parse(secTimeStamp));
            return dt.ToString(format);
        }

        /// <summary>
        /// 获取当前时间，默认格式为yyyy-MM-dd HH:mm:ss
        /// </summary>
        /// <returns></returns>
        public static string GetNowFormat()
        {
            return GetNowFormat("yyyy-MM-dd HH:mm:ss");
        }

        /// <summary>
        /// 获取当前时间字符串，可以指定格式化
        /// </summary>
        /// <param name="format"></param>
        /// <returns></returns>
        public static string GetNowFormat(string format)
        {
            format = format ?? "yyyy-MM-dd HH:mm:ss";
            return DateTime.Now.ToString(format);
        }


    }
}