using HighWayIot.Common;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.IO;

namespace UnitTest
{
    [TestClass]
    public class UnitTest1
    {
        MsgUtil msgUtil = MsgUtil.Instance;
        [TestMethod]
        public void TestMethod1()
        {
            var bytes = msgUtil.HexStrTorbytes("00 0A 00 13 01 00 00 02 10 00 00 01 99 6F 39 E9 27 00 00 02 0F 00 01");
            var res = CalculateCheckSum(bytes);
            Assert.AreEqual(0x69, res);
        }

        public void CauCheck()
        {
            var bytes = msgUtil.HexStrTorbytes("00 0A 00 13 01 00 00 02 10 00 00 01 99 6F 39 E9 27 00 00 02 0F 00 01");
            byte[] sum = new byte[1]; 
            sum[0] = CalculateCheckSum(bytes);
            var res = msgUtil.bytesToHexStr(sum, sum.Length);
            Console.WriteLine(res);
        }

        /// <summary>
        /// 和校验
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public byte CalculateCheckSum(byte[] bytes)
        {
            int length = bytes.Length;
            int check = 0;
            for (int i = 0; i < length; i++)
            {
                check += bytes[i];
            }
            byte result = (byte)(255 - (check % 255));
            return result;
        }
    }
}