using System;
using System.Globalization;
using System.Text;

namespace APT.Infrastructure.Core
{
	/// <summary>
	/// 工具类
	/// </summary>
	public static class Util
    {
        /// <summary>
        /// 新建一个 <see cref="Guid"/>与<see cref="DateTime"/>混合构成的适用于DB的可排序的<see cref="Guid"/>
        /// </summary>
        /// <returns>Comb Guid数据</returns>
        public static Guid NewID()
        {
            byte[] guidArray = Guid.NewGuid().ToByteArray();
            DateTime dtBase = new DateTime(1900, 1, 1);
            DateTime dtNow = DateTime.Now;
            //获取用于生成byte字符串的天数与毫秒数
            TimeSpan days = new TimeSpan(dtNow.Ticks - dtBase.Ticks);
            TimeSpan msecs = new TimeSpan(dtNow.Ticks - (new DateTime(dtNow.Year, dtNow.Month, dtNow.Day).Ticks));
            //转换成byte数组
            //注意SqlServer的时间计数只能精确到1/300秒
            byte[] daysArray = BitConverter.GetBytes(days.Days);
            byte[] msecsArray = BitConverter.GetBytes((long)(msecs.TotalMilliseconds / 3.333333));

            //反转字节以符合SqlServer的排序
            Array.Reverse(daysArray);
            Array.Reverse(msecsArray);

            //把字节复制到Guid中
            Array.Copy(daysArray, daysArray.Length - 2, guidArray, guidArray.Length - 6, 2);
            Array.Copy(msecsArray, msecsArray.Length - 4, guidArray, guidArray.Length - 4, 4);
            return new Guid(guidArray);
        }

        /// <summary>
        /// 加密密码
        /// </summary>
        /// <returns></returns>
        public static string EncryptPassword(string userCode, string password)
        {
            var fixedMark = "-_-APT-_-";
            String sourceString = string.Concat(fixedMark, userCode.ToUpper(), password);
            return HashUtil.GetMD5(sourceString);
        }

        /// <summary>
        /// 获取指定日期，在为一年中为第几周
        /// </summary>
        /// <param name="dt">指定时间</param>
        /// <reutrn>返回第几周</reutrn>
        public static int GetWeekOfYear(DateTime dt)
        {
            GregorianCalendar gc = new GregorianCalendar();
            int weekOfYear = gc.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
            return weekOfYear;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string UrlEncode(string str)
        {
            StringBuilder sb = new StringBuilder();
            byte[] byStr = System.Text.Encoding.UTF8.GetBytes(str); //默认是System.Text.Encoding.Default.GetBytes(str)
            for (int i = 0; i < byStr.Length; i++)
            {
                sb.Append(@"%" + Convert.ToString(byStr[i], 16));
            }

            return (sb.ToString());
        }
		 
        /// <summary>
        /// 判断byte数组是否相等
        /// </summary>
        /// <param name="bt1"></param>
        /// <param name="bt2"></param>
        /// <returns></returns>
        public static bool CompareArray(byte[] bt1, byte[] bt2)
        {
            var len1 = bt1.Length;
            var len2 = bt2.Length;
            if (len1 != len2)
            {
                return false;
            }
            for (var i = 0; i < len1; i++)
            {
                if (bt1[i] != bt2[i])
                    return false;
            }
            return true;
        }
    }
}