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

namespace SERVER
{
    /// <summary>
    /// Hex文件处理
    /// </summary>
    public class HexFile
    {
		/// <summary> 加载文件大小 </summary>
		private const int _loadFileSize = 1024 * 1024 * 2;

		/// <summary> 加载数据大小 </summary>
		private const int _loadDataSize = 1024 * 1024 * 2;

		/// <summary> 加载Hex文件数据 </summary>
		private byte[] _LoadHexFileData = new byte[_loadFileSize];

		/// <summary> 加载数据Buff </summary>
		private byte[] _LoadDataBuff = new byte[_loadDataSize];

		/// <summary> 加载结束地址 </summary>
		private int _LoadEndAddr;

		/// <summary> C1-Hex文件起始值 </summary>
		private int _HexStart_C1 = 0;

		/// <summary> 解析出的文件数据 </summary>
		private byte[] _ParseData;

		/// <summary> 解析出的配置数据 </summary>
		private byte[] _ParseConfigData;


		/// <summary> 匹配起始值 </summary>
		private int _matchingValue;

		private readonly int _matchingAddr = 49152; //0xC000 匹配数据起始地址



		/// <summary> 匹配数据 </summary>
		private byte[] _matchingData = new byte[512];

		/// <summary>
		/// 解析Hex文件
		/// </summary>
		/// <param name="filePath"></param>
		public byte[] DealHexFile(Stream filePath)
		{

			bool tmpRet = LoadDataFromFile(filePath);
			byte[] checkSum = new byte[4];

			int tmpIdx = 0;
			int tmpLineCnt = 1;
			int tmpHexValidLenght = _LoadEndAddr - _HexStart_C1;

			if (tmpRet)
			{
				StringBuilder parse = new StringBuilder();
				//Dim tmpStrBuffer As String
				for (tmpIdx = _HexStart_C1; tmpIdx < _LoadEndAddr; tmpIdx++)
				{
					parse.Append(HexByteStr(_LoadDataBuff[tmpIdx])); //<10ms
				}
				_ParseData = ConvertHexStringToBytes(parse.ToString());

				Array.Copy(_ParseData, _matchingValue, _matchingData, 0, _matchingData.Length);
				//Console.WriteLine($"——解析匹配数据——：{vbCrLf}{BitConverter.ToString(_matchingData)}")



				//'Dim a() As Byte = {&H0}
				//'Dim b As String = Encoding.GetEncoding("GBK").GetString(a)


				////_matchingData
				//byte[] project = new byte[2]; //项目编码 2 Bytes
				//Array.Copy(_matchingData, 0, project, 0, project.Length);
				////Dim projects As String = Encoding.GetEncoding("GBK").GetString(project)
				//string projects = $"{project[0] + project[1] * 256}";
				//projects = projects.Replace("\0", "");

				//byte[] roomId = new byte[4]; //房型Id 4 Bytes
				//Array.Copy(_matchingData, project.Length, roomId, 0, roomId.Length);
				////Dim roomIds As String = Encoding.GetEncoding("GBK").GetString(roomId)
				//string roomIds = $"{BitConverter.ToUInt32(roomId, 0)}";
				//roomIds = roomIds.Replace("\0", "");

				//byte[] version = new byte[20]; //版本号 20 Bytes
				//Array.Copy(_matchingData, (project.Length + roomId.Length), version, 0, version.Length);
				//string versions = Encoding.GetEncoding("GBK").GetString(version);
				//versions = versions.Replace("\0", "");

				//byte[] mcu = new byte[16]; //MCU型号 16 Bytes
				//Array.Copy(_matchingData, (project.Length + roomId.Length + version.Length), mcu, 0, mcu.Length);
				//string mcus = Encoding.GetEncoding("GBK").GetString(mcu);
				//mcus = mcus.Replace("\0", "");

				//byte[] central = new byte[16]; //中控型号 16 Bytes
				//Array.Copy(_matchingData, (project.Length + roomId.Length + version.Length + mcu.Length), central, 0, central.Length);
				//string centrals = Encoding.GetEncoding("GBK").GetString(central);
				//centrals = centrals.Replace("\0", "");

				//byte[] remark = new byte[64]; //备注 64 Bytes
				//Array.Copy(_matchingData, (project.Length + roomId.Length + version.Length + mcu.Length + central.Length), remark, 0, remark.Length);
				//	string remarks = Encoding.GetEncoding("GBK").GetString(remark);
				//remarks = remarks.Replace("\0", "");

				////MatchingInfo(projects, roomIds, versions, mcus, centrals, remarks);
			}
			return _ParseData;
		}

		public string Get_HexStart_C1()
        {
			return HexStringToBytes(_HexStart_C1);

		}
		/// <summary>
		/// 获取Hex文件中信息
		/// </summary>
		/// <returns></returns>
		public string GetHexInfo()
        {
			//_matchingData
			byte[] project = new byte[2]; //项目编码 2 Bytes
			Array.Copy(_matchingData, 0, project, 0, project.Length);
			//Dim projects As String = Encoding.GetEncoding("GBK").GetString(project)
			string projects = $"{project[0] + project[1] * 256}";
			projects = projects.Replace("\0", "");

			byte[] roomId = new byte[4]; //房型Id 4 Bytes
			Array.Copy(_matchingData, project.Length, roomId, 0, roomId.Length);
			//Dim roomIds As String = Encoding.GetEncoding("GBK").GetString(roomId)
			string roomIds = $"{BitConverter.ToUInt32(roomId, 0)}";
			roomIds = roomIds.Replace("\0", "");

			byte[] version = new byte[20]; //版本号 20 Bytes
			Array.Copy(_matchingData, (project.Length + roomId.Length), version, 0, version.Length);
			string versions = Encoding.GetEncoding("GBK").GetString(version);
			versions = versions.Replace("\0", "");

			byte[] mcu = new byte[16]; //MCU型号 16 Bytes
			Array.Copy(_matchingData, (project.Length + roomId.Length + version.Length), mcu, 0, mcu.Length);
			string mcus = Encoding.GetEncoding("GBK").GetString(mcu);
			mcus = mcus.Replace("\0", "");

			byte[] central = new byte[16]; //中控型号 16 Bytes
			Array.Copy(_matchingData, (project.Length + roomId.Length + version.Length + mcu.Length), central, 0, central.Length);
			string centrals = Encoding.GetEncoding("GBK").GetString(central);
			centrals = centrals.Replace("\0", "");

			byte[] remark = new byte[64]; //备注 64 Bytes
			Array.Copy(_matchingData, (project.Length + roomId.Length + version.Length + mcu.Length + central.Length), remark, 0, remark.Length);
			string remarks = Encoding.GetEncoding("GBK").GetString(remark);
			remarks = remarks.Replace("\0", "");

			return centrals;
		}
		


		/// <summary>
		/// 加载hex文件数据
		/// </summary>
		/// <param name="path"></param>
		/// <returns></returns>
		private bool LoadDataFromFile(Stream path)
		{
			Array.Clear(_LoadHexFileData, 0, _LoadHexFileData.Length);
			try
			{
				//System.IO.Stream fs = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read);
				if (path.Length <= _loadFileSize)
				{
					path.Read(_LoadHexFileData, 0, (int)path.Length);
				}
				else
				{
					return false;
				}
				path.Close();
			}
			catch (Exception ex)
			{
				return false;
			}

			return HexFileToData(_LoadHexFileData, _LoadDataBuff, ref _LoadEndAddr);
		}




		private string HexByteStr(byte hexByte)
		{
			if (hexByte < 16)
			{
				return "0" + Convert.ToString(hexByte, 16).ToUpper();
			}
			else
			{
				return Convert.ToString(hexByte, 16).ToUpper();
			}
		}


		/// <summary>
		/// 解析Hex文件到Byte数组
		/// </summary>
		/// <param name="hexBuffer"></param>
		/// <param name="dataBuffer"></param>
		/// <param name="endAddr"></param>
		/// <returns></returns>
		private bool HexFileToData(byte[] hexBuffer, byte[] dataBuffer, ref int endAddr)
		{
			int i = 0;

			//行数
			int LineCnt = 0;
			int DataType_00_Idx = 0;

			//清空数据缓存区域
			for (i = 0; i < dataBuffer.Length; i++)
			{
				dataBuffer[i] = 0xFF;
			}

			//本行数据缓存
			byte[] dataStrBuf = new byte[32];
			byte[] dataValBuf = new byte[16];

			//首地址标记
			bool headAddrFlag = true;

			//本行地址值
			int tmpLineAdd = 0;

			//偏移地址 0x04 数据类型指示偏移地址
			int LineAddOffestBase = 0;

			//结束地址
			endAddr = 0;

			byte[] flashAddressBuf = new byte[4];
			int flashAddress = 0;

			//INSTANT C# NOTE: The ending condition of VB 'For' loops is tested only on entry to the loop. Instant C# has created a temporary variable in order to use the initial value of hexBuffer.Length for every iteration:
			int tempVar = hexBuffer.Length;
			for (i = 0; i < tempVar; i++)
			{
				//首先找到冒号
				if (hexBuffer[i] == 0x3A) //&H3A = ":"
				{
					LineCnt += 1;
					//B0：数据长度
					int dataLen = (StrToHex(hexBuffer[i + 1]) * 16 + StrToHex(hexBuffer[i + 2]));
					if (dataLen > 0)
					{
						//By：CheckSum
						byte checkSum = (byte)(StrToHex(hexBuffer[i + 9 + dataLen * 2]) * 16 + StrToHex(hexBuffer[i + 10 + dataLen * 2]));

						//取出整行数据
						byte[] rowDataStrBuf = new byte[42];
						byte[] rowDataValBuf = new byte[21];
						int rowLen = 0;
						Array.Clear(rowDataStrBuf, 0, 42);
						Array.Clear(rowDataValBuf, 0, 21);

						rowLen = (dataLen * 2) + 10;
						Array.Copy(hexBuffer, i + 1, rowDataStrBuf, 0, rowLen);
						StrToHex(rowDataValBuf, rowDataStrBuf, Convert.ToUInt16(rowLen / 2.0));

						//using System;

						int tempVar2 = Convert.ToInt32(rowLen / 2.0);
						byte tempCheckSum = GetSumChecks(rowDataValBuf, ref tempVar2);

						if (tempCheckSum != 0xFF)
						{
							return false; //CheckSum校验不通过，返回错误
						}

						//B4~Bx：数据内容
						Array.Clear(dataStrBuf, 0, 32);
						Array.Clear(dataValBuf, 0, 16);
						Array.Copy(hexBuffer, i + 9, dataStrBuf, 0, dataLen * 2);
						StrToHex(dataValBuf, dataStrBuf, (UInt16)dataLen);
					}

					//B1~B2：取出地址位的值
					Array.Copy(hexBuffer, i + 3, flashAddressBuf, 0, 4);

					//本行地址取出来放在 flashAddress中’
					UInt16 tempVar3 = (UInt16)tmpLineAdd;
					StrToHex(ref tempVar3, flashAddressBuf);
					tmpLineAdd = tempVar3;
					flashAddress = LineAddOffestBase + tmpLineAdd;

					//B3：数据类型
					var dataType = StrToHex(hexBuffer[i + 8]);
					switch (dataType)
					{
						case 0: //数据记录
							DataType_00_Idx = DataType_00_Idx + 1;
							//将第一个00类型数据的地址作为起始地址， 保存到 _HexStart_C1
							if (DataType_00_Idx == 1)
							{
								_HexStart_C1 = flashAddress;
								_matchingValue = _matchingAddr - _HexStart_C1;
							}
							Array.Copy(dataValBuf, 0, dataBuffer, flashAddress, dataLen);
							endAddr = flashAddress + dataLen;
							break;
						case 1: //文件结束
							if (endAddr == 0)
							{
								return false;
							}
							else
							{
								return true;
							}
							//break;
						case 2:
						case 3:
						case 5: //扩展段地址, 开始段地址, 开始线性地址’
							continue;
						case 4: //扩展线性地址
							if (dataLen == 2)
							{
								LineAddOffestBase = (dataValBuf[0] * 256 + dataValBuf[1]) * 65536;
							}
							else
							{
								return false; //确认DataLen必须是2，否则报错
							}
							break;
						default:
							return false;
					}
				}
			}

			return false;
		}


		public  static void StrToHex(byte[] pbDest, byte[] pbSrc, UInt16 nLen)
		{
			byte h1 = 0;
			byte h2 = 0;
			byte s1 = 0;
			byte s2 = 0;
			int i = 0;

			for (i = 0; i < nLen; i++)
			{
				h1 = pbSrc[2 * i];
				h2 = pbSrc[2 * i + 1];

				s1 = (byte)(toupper(h1) - 0x30);
				if (s1 > 9)
				{
					s1 -= 7;
				}

				s2 = (byte)(toupper(h2) - 0x30);
				if (s2 > 9)
				{
					s2 -= 7;
				}

				pbDest[i] = (byte)(s1 * 16 + s2);
			}
		}

		private void StrToHex(ref UInt16 pbDest, byte[] pbSrc)
		{
			byte[] pBufDest = new byte[2];
			byte h1 = 0;
			byte h2 = 0;
			byte s1 = 0;
			byte s2 = 0;
			UInt16 i = 0;

			for (i = 0; i < 2; i++)
			{
				h1 = pbSrc[2 * i];
				h2 = pbSrc[2 * i + 1];

				s1 = (byte)(toupper(h1) - 0x30);
				if (s1 > 9)
				{
					s1 -= 7;
				}

				s2 = (byte)(toupper(h2) - 0x30);
				if (s2 > 9)
				{
					s2 -= 7;
				}

				pBufDest[i] = (byte)(s1 * 16 + s2);
			}
			//pbDest = (pBufDest(0) << 8) + pBufDest(1)
			pbDest = (UInt16)(pBufDest[0] * 256 + pBufDest[1]);
		}

		private byte StrToHex(/*object*/ int  src)
		{
			if (Convert.ToInt32(src) >= 0x30 && Convert.ToInt32(src) <= 0x39)
			{
				return Convert.ToByte((src - 0x30));
			}
			else if (Convert.ToInt32(src) >= 0x41 && Convert.ToInt32(src) <= 0x46)
			{
				return Convert.ToByte((src - 0x41 + 10));
			}
			else if (Convert.ToInt32(src) >= 0x61 && Convert.ToInt32(src) <= 0x66)
			{
				return Convert.ToByte((src - 0x61 + 10));
			}
			else
			{
				return 0;
			}
		}
		public static byte toupper(byte val)
		{
			if (val >= 0x61 && val <= 0x7A)
			{
				return (byte)(val - 0x20);
			}
			else
			{
				return val;
			}
		}

		/// <summary>
		/// 和校验
		/// 求Byte数组的和校验
		/// </summary>
		/// <param name="dataPacket">Byte数组</param>
		/// <returns></returns>
		public byte GetSumChecks(byte[] dataPacket, ref int len)
		{
			int sum = 0;
			for (var idx = 0; idx < len; idx++)
			{
				sum += dataPacket[idx];
				sum &= 0xFF;
			}

			sum = (~sum) & 0xFF;
			return (byte)sum;
		}


		//&H
		public byte[] GetStringToDataByte(string str)
	{
		List<byte> dataList = new List<byte>();

		for (int index = 0; index < str.Length; index += 2)
		{
			dataList.Add(Convert.ToByte($"{str.Substring(index, 2)}"));
		}
		return dataList.ToArray();
	}


		/// <summary>
		/// 16进制原码字符串转字节数组
		/// </summary>
		/// <param name="hexString">"AABBCC"或"AA BB CC"格式的字符串</param>
		/// <returns></returns>
		public static byte[] ConvertHexStringToBytes(string hexString)
		{
			hexString = hexString.Replace(" ", "");
			if (hexString.Length % 2 != 0)
			{
				throw new ArgumentException("参数长度不正确,必须是偶数位。");
			}
			byte[] returnBytes = new byte[hexString.Length / 2];
			for (int i = 0; i < returnBytes.Length; i++)
			{
				returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
			}

			return returnBytes;
		}



		/// <summary>
		/// Byte[] 转 File
		/// </summary>
		/// <param name="fileData"></param>
		public void ByteToFile(byte[] fileData)
		{
			string fileName = DateTime.Now.ToString("yyyyMMddhhmmss") + ".bin";
			string dirPath = @"D:\测试";

			if (!Directory.Exists(dirPath))
				Directory.CreateDirectory(dirPath);

			string filePath = Path.Combine(dirPath, fileName);
			FileStream fileStream = new(filePath, FileMode.Create);
			fileStream.Write(fileData, 0, fileData.Length);
			fileStream.Close();
		}


		public string HexStringToBytes(int set)
        {
			 string str = set.ToString("X6");
			return str;
        }




     /// Name: CRC-16/IBM    x16+x15+x2+1
     /// Poly: 0x8005
     /// Init: 0x0000
     /// Refin: true
     /// Refout: true
     /// Xorout: 0x0000    
     ///*************************************************************************
         public static byte[] Crc16(byte[] buffer, int start = 0, int len = 0)
        {
            if (buffer == null || buffer.Length == 0) return null;
            if (start < 0) return null;
            if (len == 0) len = buffer.Length - start;
            int length = start + len;
            if (length > buffer.Length) return null;
            ushort crc = 0;// Initial value
            for (int i = start; i < length; i++)
            {
                crc ^= buffer[i];
                for (int j = 0; j < 8; j++)
                {
                    if ((crc & 1) > 0)
                        crc = (ushort)((crc >> 1) ^ 0xA001);// 0xA001 = reverse 0x8005
                    else
                        crc = (ushort)(crc >> 1);
                }
            }
            byte[] ret = BitConverter.GetBytes(crc);
            Array.Reverse(ret);
            return ret;
        }


        public static int NetCRC16_Data(byte[] aStr, int len, int crc_id)
		{
			int xda, xdapoly;
			int i, j, xdabit;
			xda = 0xFFFF;
			xdapoly = 0xA001; // (X**16 + X**15 + X**2 + 1)
			for (i = 0; i < len; i++)
			{
				if ((i == crc_id) || (i == (crc_id + 1)))
				{
					xda ^= 0x00;
				}
				else
				{
					xda ^= aStr[i];
				}

				for (j = 0; j < 8; j++)
				{
					xdabit = (byte)(xda & 0x01);
					xda >>= 1;
					if (xdabit!=0) xda ^= xdapoly;
				}
			}
			return xda;
		}
	}
}