using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace HighWayIot.Common
{
    /// <summary>
    /// 工具类
    /// </summary>
    public sealed class MsgUtil
    {

        private static readonly Lazy<MsgUtil> lazy = new Lazy<MsgUtil>(() => new MsgUtil());

        public static MsgUtil Instance
        {
            get
            {
                return lazy.Value;
            }
        }

        private MsgUtil() { }


        public byte[] HexStrTorbytes(string strHex)//e.g. " 01 01" ---> { 0x01, 0x01}
        {
            strHex = strHex.Replace(" ", "");
            if ((strHex.Length % 2) != 0)
                strHex += " ";
            byte[] returnBytes = new byte[strHex.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(strHex.Substring(i * 2, 2), 16);
            return returnBytes;
        }

        /// <summary>
        /// 将字符串强制转换成int，转换失败则返回0
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public int ParseToInt(string str)
        {
            int returnInt = 0;

            if (str == null || str.Trim().Length < 1)
            {
                return returnInt;
            }

            if (int.TryParse(str, out returnInt))
            {
                return returnInt;
            }
            else
            {
                return 0;
            }
        }

        public byte[] HexToString(string Str)
        {
            byte[] str = new byte[Str.Length / 2];
            for (int i = 0; i < str.Length; i++)
            {
                int temp = Convert.ToInt32(Str.Substring(i * 2, 2), 16);
                str[i] = (byte)temp;
            }
            return str;
        }

        /// <summary>
        /// byte数组转换成十六进制字符串
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="iLen"></param>
        /// <returns></returns>
        public string bytesToHexStr(byte[] bytes, int iLen)
        {
            StringBuilder sb = new StringBuilder();
            if (bytes != null)
            {
                for (int i = 0; i < iLen; i++)
                {
                    sb.Append(bytes[i].ToString("X2") + " ");
                }
            }
            return sb.ToString();
        }

        /// <summary>
        /// 从十进制转换到十六进制
        /// </summary>
        /// <param name="ten"></param>
        /// <returns></returns>
        public string Ten2Hex(string ten)
        {
            ulong tenValue = Convert.ToUInt64(ten);
            ulong divValue, resValue;
            string hex = "";
            do
            {
                //divValue = (ulong)Math.Floor(tenValue / 16);

                divValue = (ulong)Math.Floor((decimal)(tenValue / 16));

                resValue = tenValue % 16;
                hex = tenValue2Char(resValue) + hex;
                tenValue = divValue;
            }
            while (tenValue >= 16);
            if (tenValue != 0)
                hex = tenValue2Char(tenValue) + hex;
            return hex;
        }

        public static string tenValue2Char(ulong ten)
        {
            switch (ten)
            {
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                case 5:
                case 6:
                case 7:
                case 8:
                case 9:
                    return ten.ToString();
                case 10:
                    return "A";
                case 11:
                    return "B";
                case 12:
                    return "C";
                case 13:
                    return "D";
                case 14:
                    return "E";
                case 15:
                    return "F";
                default:
                    return "";
            }
        }
    }
}