using Gestor.Common.Validation;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.CompilerServices;

namespace Gestor.Common.Helpers
{
	public class Functions
	{
		public static System.Diagnostics.Stopwatch Stopwatch;

		public static DateTime? StartTime;

		public Functions()
		{
		}

		public static int Compare(string original, string modified)
		{
			if (original == null)
			{
				original = "";
			}
			if (modified == null)
			{
				modified = "";
			}
			string str = original.ToLongNullable().ToString();
			if (!string.IsNullOrWhiteSpace(str))
			{
				original = str;
			}
			str = modified.ToLongNullable().ToString();
			if (!string.IsNullOrWhiteSpace(str))
			{
				modified = str;
			}
			int length = original.Length;
			int num = modified.Length;
			int[,] numArray = new int[length + 1, num + 1];
			for (int i = 0; i <= length; i++)
			{
				numArray[i, 0] = i;
			}
			for (int j = 0; j <= num; j++)
			{
				numArray[0, j] = j;
			}
			for (int k = 1; k <= length; k++)
			{
				for (int l = 1; l <= num; l++)
				{
					int num1 = modified[l - 1] != original[k - 1];
					numArray[k, l] = (new int[] { numArray[k - 1, l] + 1, numArray[k, l - 1] + 1, numArray[k - 1, l - 1] + num1 }).Min();
					if (k > 1 && l > 1 && original[k - 1] == modified[l - 2] && original[k - 2] == modified[l - 1])
					{
						numArray[k, l] = Math.Min(numArray[k, l], numArray[k - 2, l - 2] + num1);
					}
				}
			}
			return numArray[length, num];
		}

		public static DateTime GetNetworkTime()
		{
			DateTime value;
			try
			{
				if (!Functions.StartTime.HasValue)
				{
					byte[] numArray = new byte[48];
					numArray[0] = 27;
					IPEndPoint pEndPoint = new IPEndPoint(((IEnumerable<IPAddress>)Dns.GetHostEntry("time.google.com").AddressList).First<IPAddress>((IPAddress a) => a.AddressFamily == AddressFamily.InterNetwork), 123);
					using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
					{
						socket.Connect(pEndPoint);
						socket.ReceiveTimeout = 3000;
						socket.Send(numArray);
						socket.Receive(numArray);
						socket.Close();
					}
					ulong num = (ulong)numArray[40] << 24 | (ulong)numArray[41] << 16 | (ulong)numArray[42] << 8 | (ulong)numArray[43];
					ulong num1 = (ulong)numArray[44] << 24 | (ulong)numArray[45] << 16 | (ulong)numArray[46] << 8 | (ulong)numArray[47];
					ulong num2 = num * (long)1000 + num1 * (long)1000 / 4294967296L;
					DateTime dateTime = new DateTime(1900, 1, 1);
					dateTime = dateTime.AddMilliseconds((double)num2);
					Functions.StartTime = new DateTime?(dateTime.ToLocalTime());
					Functions.Stopwatch = System.Diagnostics.Stopwatch.StartNew();
					value = Functions.StartTime.Value;
				}
				else
				{
					value = Functions.StartTime.Value;
					value = value.AddMilliseconds((double)Functions.Stopwatch.ElapsedMilliseconds);
				}
			}
			catch (Exception exception)
			{
				Functions.StartTime = new DateTime?(DateTime.Now);
				Functions.Stopwatch = System.Diagnostics.Stopwatch.StartNew();
				value = Functions.StartTime.Value;
			}
			return value;
		}
	}
}