using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading;
using System.Management;
using Microsoft.Win32;

namespace DriveASC.manage
{
	public class Utils
	{
		public static void ClearMemoryStream(MemoryStream stream)
		{
			byte[] buffer = stream.GetBuffer();
			Array.Clear(buffer, 0, buffer.Length);
			stream.Position = 0;
			stream.SetLength(0);
		}

		/// <summary>
		/// Double to string conversion without scientific notation
		/// </summary>
		/// <param name="input"></param>
		/// <returns></returns>
		public static string FloatToLongString(float input)
		{
			string str = input.ToString().ToUpper();

			// if string representation was collapsed from scientific notation, just return it:
			if (!str.Contains("E")) return str;

			bool negativeNumber = false;

			if (str[0] == '-')
			{
				str = str.Remove(0, 1);
				negativeNumber = true;
			}

			string sep = Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator;
			char decSeparator = sep.ToCharArray()[0];

			string[] exponentParts = str.Split('E');
			string[] decimalParts = exponentParts[0].Split(decSeparator);

			// fix missing decimal point:
			if (decimalParts.Length == 1) decimalParts = new string[] { exponentParts[0], "0" };

			int exponentValue = int.Parse(exponentParts[1]);

			string newNumber = decimalParts[0] + decimalParts[1];

			string result;

			if (exponentValue > 0)
			{
				result =
					newNumber +
					GetZeros(exponentValue - decimalParts[1].Length);
			}
			else // negative exponent
			{
				result =
					"0" +
					decSeparator +
					GetZeros(exponentValue + decimalParts[0].Length) +
					newNumber;

				result = result.TrimEnd('0');
			}

			if (negativeNumber)
				result = "-" + result;

			return result;
		}

		public static string R_ProcessorID
		{
			get
			{
				try
				{
					ManagementObjectSearcher MOS = new ManagementObjectSearcher("Select * from Win32_Processor");
					foreach (ManagementObject MO in MOS.Get())
					{
						return MO["ProcessorId"].ToString();
					}
				}
				catch { }
				return "";
			}
		}

		public static string R_DiskDriveID
		{
			get
			{
				try
				{
					ManagementObjectSearcher MOS = new ManagementObjectSearcher("Select * from Win32_DiskDrive");
					foreach (ManagementObject MO in MOS.Get())
					{
						return MO["Signature"].ToString();
					}
				}
				catch { }

				return "";
			}
		}

		public static string R_MachineGUID
		{
			get
			{
				string val = "";
				try
				{
					RegistryKey hklm = Registry.LocalMachine;
					RegistryKey hklm_cr = hklm.OpenSubKey(@"SOFTWARE\Microsoft\Cryptography");
					val = (string)hklm_cr.GetValue("MachineGuid");
					hklm_cr.Close();
				}
				catch { }
				
				return val;
			}
		}

		private static string GetZeros(int zeroCount)
		{
			if (zeroCount < 0)
				zeroCount = Math.Abs(zeroCount);

			StringBuilder sb = new StringBuilder();

			for (int i = 0; i < zeroCount; i++) sb.Append("0");

			return sb.ToString();
		}

		private static uint[] _crc32_table = new uint[] {
            0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419,
            0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4,
            0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07,
            0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
            0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856,
            0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
            0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4,
            0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
            0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3,
            0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A,
            0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599,
            0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
            0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190,
            0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F,
            0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E,
            0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
            0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED,
            0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
            0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3,
            0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
            0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A,
            0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5,
            0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010,
            0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
            0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17,
            0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6,
            0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615,
            0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
            0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344,
            0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
            0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A,
            0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
            0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1,
            0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C,
            0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF,
            0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
            0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE,
            0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31,
            0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C,
            0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
            0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B,
            0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
            0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1,
            0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
            0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278,
            0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7,
            0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66,
            0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
            0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605,
            0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8,
            0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B,
            0x2D02EF8D
        };

		public static string InsertTires(string text)
		{
			string result = text;
			if (text.Length > 4)
			{
				int tireCnt = text.Length / 4;
				for(int i = 0; i < tireCnt; i++)
				{
					int insat = text.Length - 4 * (i + 1);
					if (insat > 1)
					{
						result = result.Insert(insat, "-");
					}
					else
					{
						break;
					}
				}				
			}

			return result;
		}
		
		public static uint GetCRC32(string text)
		{
			if (string.IsNullOrWhiteSpace(text))
			{
				return 1;
			}

			byte[] buffer = Encoding.UTF8.GetBytes(text);
			int start = 0;
			int length = buffer.Length;
			
			uint d = 0xffffffff;
			uint c = 0;
			c ^= d;

			unchecked
			{
				while (--length >= 0)
				{
					c = _crc32_table[(c ^ buffer[start++]) & 0xFF] ^ (c >> 8);
				}
			}

			c ^= d;

			byte[] HashValue = new byte[] {
				(byte)((c >> 24) & 0xff), 
                (byte)((c >> 16) & 0xff), 
                (byte)((c >> 8) & 0xff), 
                (byte)(c & 0xff)
			};
			
			return (uint)((HashValue[0] << 24) | (HashValue[1] << 16) | (HashValue[2] << 8) | HashValue[3]);
		}
	}
}
