using System;
using System.Text;

namespace EC.Utils.Helper
{
	public class ByteHelper
	{
		public static string IntToHex(int i)
		{
			return Convert.ToString(i, 16);
		}

		/// <summary>
		/// int 类型转回为 byte[]
		/// </summary>
		/// <param name="i"></param>
		/// <returns></returns>
		public static byte[] IntToByte2(int i)
		{
			byte[] a = new byte[2];
			a[0] = (byte)(i >> 8);
			a[1] = (byte)i;
			return a;
		}

		/// <summary>
		/// 截取byte 数组
		/// </summary>
		/// <param name="frombyte"></param>
		/// <param name="begIndex"></param>
		/// <param name="lenth"></param>
		/// <returns></returns>
		public static byte[] SubArr(byte[] frombyte, int begIndex, int lenth)
		{
			byte[] subByte = new byte[lenth];
			int icount = (begIndex + lenth);
			for (int x = begIndex; x < icount; x++)
			{
				subByte[x - begIndex] = frombyte[x];
			}
			return subByte;
		}

		public static string SubToString(byte[] frombyte, int begIndex, int lenth)
		{
			byte[] subByte = new byte[lenth];
			int icount = (begIndex + lenth);
			for (int x = begIndex; x < icount; x++)
			{
				subByte[x - begIndex] = frombyte[x];
			}
			return Encoding.UTF8.GetString(subByte);
		}

		/// <summary>
		/// 数组相加
		/// </summary>
		/// <param name="bytes1"></param>
		/// <param name="bytes2"></param>
		/// <returns></returns>
		public static byte[] Add(byte[] bytes1, byte[] bytes2)
		{
			int len1 = bytes1.Length;
			int len2 = bytes2.Length;
			int allLen = len1 + len2;
			byte[] newByte = new byte[allLen];

			for (int x = 0; x < len1; x++)
			{
				newByte[x] = bytes1[x];
			}
			for (int x = 0; x < len2; x++)
			{
				newByte[x + len1] = bytes2[x];
			}
			return newByte;
		}

		/// <summary>
		/// subbyte 合并到 bytesA
		/// </summary>
		/// <param name="bytesA">原始数组</param>
		/// <param name="subbytes">添加数组</param>
		/// <param name="index">添加起开始位置</param>
		/// <returns></returns>
		public static byte[] Append(byte[] bytesA, byte[] subbytes, int index)
		{
			int len1 = subbytes.Length;

			for (int x = 0; x < len1; x++)
			{
				bytesA[x + index] = subbytes[x];
			}

			return bytesA;
		}

		public static byte[] Append(byte[] bytesA, string substr, int index)
		{
			int len1 = substr.Length;

			byte[] subbytes = Encoding.UTF8.GetBytes(substr);
			for (int x = 0; x < len1; x++)
			{
				bytesA[x + index] = subbytes[x];
			}

			return bytesA;
		}

		public static byte[] HexStringToByteArray(string s)
		{
			s = s.Replace(" ", "");
			byte[] buffer = new byte[s.Length / 2];
			for (int i = 0; i < s.Length; i += 2)
			{
				buffer[i / 2] = (byte)Convert.ToByte(s.Substring(i, 2), 16);
			}

			return buffer;
		}

		/// <summary> Converts an array of bytes into a formatted string of hex digits (ex: E4 CA B2)</summary>
		/// <param name="data"> The array of bytes to be translated into a string of hex digits. </param>
		/// <returns> Returns a well formatted string of hex digits with spacing. </returns>
		public static string ByteArrayToHexString(byte[] data)
		{
			StringBuilder sb = new StringBuilder(data.Length * 3);
			foreach (byte b in data)
			{
				sb.Append(Convert.ToString(b, 16).PadLeft(2, '0').PadRight(3, ' '));
			}

			return sb.ToString().ToUpper();
		}
	}
}