using System;
using System.Text;
using System.Text.RegularExpressions;

namespace Admin.Core.Common
{
    public static class UnicodeHelper
    {
        /// <summary>
        /// 字符串转Unicode码
        /// </summary>
        /// <returns>The to unicode.</returns>
        /// <param name="value">Value.</param>
        public static string StringToUnicode(string value)
        {
            byte[] bytes = Encoding.Unicode.GetBytes(value);
            StringBuilder stringBuilder = new StringBuilder();
            for (int i = 0; i < bytes.Length; i += 2)
            {
                // 取两个字符，每个字符都是右对齐。
                stringBuilder.AppendFormat("u{0}{1}", bytes[i + 1].ToString("x").PadLeft(2, '0'), bytes[i].ToString("x").PadLeft(2, '0'));
            }
            return stringBuilder.ToString();
        }

        /// <summary>
        /// Unicode转字符串
        /// </summary>
        /// <returns>The to string.</returns>
        /// <param name="unicode">Unicode.</param>
        public static string UnicodeToString(string unicode)
        {
            unicode = unicode.Replace("%", "\\");

            return new Regex(@"\\u([0-9A-F]{4})", RegexOptions.IgnoreCase | RegexOptions.Compiled).Replace(
                 unicode, x => string.Empty + Convert.ToChar(Convert.ToUInt16(x.Result("$1"), 16)));

            //string resultStr = "";
            //string[] strList = unicode.Split('u');
            //for (int i = 1; i < strList.Length; i++)
            //{
            //    resultStr += (char)int.Parse(strList[i], System.Globalization.NumberStyles.HexNumber);
            //}
            //return resultStr;
        }
        /// <summary>
        /// Bytes转16进制字符
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="iLen"></param>
        /// <returns></returns>
        public static string BytesToHexStr(byte[] bytes, int iLen)//e.g. { 0x01, 0x01} ---> " 01 01"
        {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < iLen; i++)
                {
                    returnStr += bytes[i].ToString("X2");
                }
            }
            return returnStr;
        }

    }
}