namespace YLErp.Helpers
{
    /// <summary>
    /// 
    /// </summary>
    public static class DataHelper
    {
        /// <summary>
        /// 将数字转换成字母序号
        /// </summary>
        public static string ConvertToLetter(this int index)
        {
            const byte suffix_Start = 65;
            const byte suffix_Range = 90 - suffix_Start + 1;
            var result = "";

            var count = (index / suffix_Range) - 1;
            if (count >= 0)
            { result = ConvertToLetter(count); }
            result += ((char)(suffix_Start + (index % suffix_Range))).ToString();
            return result;
        }

        /// <summary>
        /// 生成验证码
        /// </summary>
        public static string GenerateCheckCode(int codeCount)
        {
            var rep = 0;
            var str = string.Empty;
            var num2 = DateTime.Now.Ticks + rep;
            rep++;
            var random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> rep)));
            for (var i = 0; i < codeCount; i++)
            {
                char ch;
                var num = random.Next();
                if ((num % 2) == 0)
                {
                    ch = (char)(0x30 + ((ushort)(num % 10)));
                }
                else
                {
                    ch = (char)(0x41 + ((ushort)(num % 0x1a)));
                }
                str += ch.ToString();
            }
            return str;
        }

        /// <summary>
        /// 密码加密
        /// </summary>
        public static string EncryptPassword(string salt, string password)
        {
            var sha = System.Security.Cryptography.SHA1.Create();
            var byteResult = sha.ComputeHash(System.Text.Encoding.UTF8.GetBytes(salt + password));
            return BitConverter.ToString(byteResult);
        }

        public static T DeepCopyObject<T>(T orginObj)
        {
            if (orginObj == null)
            {
                return default(T);
            }
            var orginObjJson = JsonHelper.Serialize(orginObj);
            var newObj = JsonHelper.Parse<T>(orginObjJson);
            return newObj;
        }
    }
}