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

namespace BatCharging.Service
{
    public class BitsConvertUtils
    {
        public static byte GetByte(byte[] data, int bitSize, int bitOffset)
        {
            int byteOffset = bitOffset / 8;
            var b = data[byteOffset];
            var offset = bitOffset % 8;
            b >>= offset;

            byte mask = (byte)(2 ^ bitSize - 1);
            b &= mask;

            return b;
        }

        public static int GetInt(byte[] data, int bitSize, int bitOffset)
        {
            int rightShift = 32 - bitSize;

            int byteOffset = bitOffset / 8;
            byte b1 = data[byteOffset];
            byte b2 = data[byteOffset + 1];
            byte b3 = data[byteOffset + 2];
            byte b4 = data[byteOffset + 3];
            var barray = new BitArray(new byte[] { b4, b3, b2, b1 });
            int i = 0;
            for (int d = rightShift; d < rightShift + bitSize; d++)
            {
                if (barray[d])
                    i += Convert.ToInt32(Math.Pow(2, d - rightShift));
            }
            return i;
        }

        public static byte[] GetByteArray(byte[] data, int bitSize, int bitOffset)
        {
            var bytes = bitSize / 8;
            var byteOffset = bitOffset / 8;
            var dest = new byte[bytes];
            Array.Copy(data, byteOffset, dest, 0, bytes);
            return dest;
        }

        private String ToFullBinaryStr(byte num)
        {
            char[] rst = new char[8];
            for (int i = 0; i < 8; i++)
            {
                rst[8 - 1 - i] = (char)((num >> i & 1) + '0');
            }
            return new String(rst);
        }

        /// <summary>
        /// 将一个字节转换到二进制字节数组.(高位在位数组低索引位，低位在位数组高索引位）
        /// </summary>
        /// <param name="num">需转换字节</param>
        /// <returns>二进制字节数组</returns>
        private static byte[] ToFullBinaryBytes(byte num)
        {
            byte[] rst = new byte[8];
            for (int i = 0; i < 8; i++)
            {
                rst[i] = (byte)((num >> i & 1));
            }
            return rst;
        }


        /// <summary>
        /// 得到字节中单Bit的值(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>
        /// <returns>返回字节结果，byte:1,0</returns>
        public static byte ByteToBitValue(byte[] data, int byteAddr, int bitStartAddr)
        {
            byte result = 9;
            if (data.Count() >= (byteAddr + 1))
            {
                byte value = data[byteAddr];
                result = ToFullBinaryBytes(value)[bitStartAddr];
            }
            return result;
        }


        /// <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)
        {
            //msg.CSCT01 = (byte)(BitsConvertUtils.ByteToBitsValue(data, 3, 0, 8)-50);
            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>
        /// 根据高位优先的原理的两字节数据解析返回一个16位无符号整数(高字节在数组低索引位，低字节在数组高索引位）
        /// </summary>
        /// <param name="value">原字节数组</param>
        /// <param name="offset">缓冲区偏移</param>
        /// <returns>返回无符号整数</returns>
        public static ushort ToUInt16(byte[] value, int offset)
        {
            return (ushort)((value[offset] << 8) + value[offset + 1]);
        }


        /// <summary>
        /// 根据高位优先的原理的两字节数据解析返回一个16位无符号整数
        /// </summary>
        /// <param name="valH">高字节</param>
        /// <param name="valL">低字节</param>
        /// <returns></returns>
        public static ushort ToUInt16(byte valH, byte valL)
        {
            return (ushort)((valH << 8) + valL);
        }



        public static void WriteBit(ref byte[] data, int bitoffset, int bitSize, int value)
        {
            int byteoffset = bitoffset / 8;
            int offset = bitoffset % 8;

            value = value << bitoffset;
            var d = data[byteoffset];

            d = (byte)((int)d & value);
            data[byteoffset] = d;
        }


        public static void WriteBit(ref byte[] data, int bitoffset, int bitSize, byte[] value)
        {
            int byteoffset = bitoffset / 8;
            for (int i = byteoffset; i < value.Length; i++)
            {
                data[i] = value[i - byteoffset];
            }
        }

        /// <summary>
        /// 将字符串转换成字节数组
        /// </summary>
        /// <param name="StrSrc">字符串</param>
        /// <returns>字节数组</returns>
        public static byte[] StrToBytes(string StrSrc)
        {
            byte[] byteResults = null;
            List<byte> lstBytes = null;
            if (StrSrc != null)
            {
                if (StrSrc.Trim() != "")
                {
                    lstBytes = new List<byte>();
                    int iLength = StrSrc.Length / 2;
                    for (int i = 0; i < iLength; i++)
                    {
                        string strElet = StrSrc.Substring(i * 2, 2);
                        byte element = Convert.ToByte(strElet, 16); ;
                        lstBytes.Add((byte)element);
                    }
                    byteResults = lstBytes.ToArray();
                }
            }
            return byteResults;
        }


        /// <summary>
        /// 将字符串转换成高低位转换的字节数组-目前此方法只解决0x00两个字符组成一个字节的情形，如果是单字符解决不了
        /// </summary>
        /// <param name="StrSrc">字符串</param>
        /// <returns>高低位转换的字节数组</returns>
        public static byte[] StrToRevBytes(string StrSrc)
        {
            byte[] byteResults = null;
            List<byte> lstBytes = null;
            if (StrSrc != null)
            {
                if (StrSrc.Trim() != "")
                {
                    lstBytes = new List<byte>();
                    int iLength = StrSrc.Length / 2;
                    for (int i = 0; i < iLength; i++)
                    {
                        string strElet = StrSrc.Substring(i * 2, 2);
                        byte element = Convert.ToByte(strElet, 16); ;
                        lstBytes.Add((byte)element);
                    }
                    if (lstBytes != null)
                    {
                        List<byte> lstTemp = new List<byte>();
                        if (lstBytes.Count > 0)
                        {
                            int num = lstBytes.Count;
                            for (int j = 0; j < num; j++)
                            {
                                lstTemp.Add(lstBytes[num - 1 - j]);
                            }
                        }
                        byteResults = lstTemp.ToArray();
                    }
                }
            }
            return byteResults;
        }

        /// <summary>
        /// 字节数组转16进制字符串：空格分隔
        /// </summary>
        /// <param name="byteDatas"></param>
        /// <returns></returns>
        public static string BytesToHexStr(byte[] byteDatas)
        {
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < byteDatas.Length; i++)
            {
                builder.Append(string.Format("{0:X2} ", byteDatas[i]));
            }
            return builder.ToString().Trim();
        }

        /// <summary>
        /// 16进制格式字符串转字节数组
        /// </summary>
        /// <param name="hexStr"></param>
        /// <returns></returns>
        public static byte[] HexStrToBytes(string hexStr)
        {
            //以 ' ' 分割字符串，并去掉空字符
            string[] chars = hexStr.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            byte[] returnBytes = new byte[chars.Length];
            //逐个字符变为16进制字节数据
            for (int i = 0; i < chars.Length; i++)
            {
                returnBytes[i] = Convert.ToByte(chars[i], 16);
            }
            return returnBytes;
        }

        /// <summary>
        /// 32进制数高低位对调
        /// </summary>
        /// <param name="value"></param>
        /// <returns>字节数组</returns>
        public static byte[] UInt32ToBytes(UInt32 value)
        {
            byte[] bytesResult = new byte[4];
            byte[] temp = new byte[4];

            BitConverter.GetBytes(Convert.ToUInt32(value)).CopyTo(temp, 0);

            bytesResult[0] = temp[3];
            bytesResult[1] = temp[2];
            bytesResult[2] = temp[1];
            bytesResult[3] = temp[0];

            return bytesResult;
        }

    }
}