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

namespace Module.UpsEqm.ModBusTcp
{
    public class BitsConvertUtils
    {
        /// <summary>
        /// 得到字节中Bit组合的值,高位在前，低位在后(高字节在数组低索引位，低字节在数组高索引位）
        /// </summary>
        /// <param name="data">字节数组</param>
        /// <param name="byteAddr">字节位置:数组中第几个字节(从0开始)</param>
        ///  <param name="bitStartAddr">Bit在字节中的位置:第几位(从0开始)</param>
        /// <param name="bitOffset">字节中位的偏移量</param>
        /// <returns>返回字节结果，byte:1,0</returns>
        public static byte ByteToBitsValue(byte[] data, int byteAddr, int bitStartAddr, int bitOffset)
        {
            byte result = 9;

            if (data.Count() >= (byteAddr + 1))
            {
                byte value = data[byteAddr];
                if ((bitStartAddr + bitOffset) <= 8)
                {
                    byte temp = 0;
                    for (int i = bitStartAddr; i < bitStartAddr + bitOffset; i++)
                    {
                        temp += (byte)(((value >> i & 1)) << (i - bitStartAddr));
                    }
                    result = temp;
                }
            }
            return result;
        }

        /// <summary>
        /// 字节数组转字符串
        /// </summary>
        /// <param name="byteDatas"></param>
        /// <returns></returns>
        public static string BytesTostr(byte[] byteDatas)
        {
            string strResult = "";
            for (int i = 0; i < byteDatas.Length; i++)
            {
                try
                {
                    strResult += Convert.ToChar(byteDatas[i]).ToString() + Convert.ToChar(byteDatas[i + 1]).ToString();
                    i++;
                }
                catch (Exception e)
                {
                    e.ToString();
                }
            }
            return strResult;
        }



        public static bool GetBitValue(byte value, byte bit)
        {
            return (value & (byte)Math.Pow(2, bit)) > 0 ? true : false;
        }
    }
}