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

namespace Tor.Extensions
{

  public static class Extensions
  {
    /// <summary>
		/// Determine if socket is connected
    /// "Poll" returns true if
    /// connection is closed, reset, terminated or pending (meaning no active connection)
    /// connection is active and there is data available for reading
    /// "Available" returns number of bytes available for reading
    /// if both are true:
    /// There is no data available to read so connection is not active
		/// </summary>
		/// <param name="socket">The socket</param>
    public static bool IsConnected(this Socket socket)
    {
      try
      {
        bool part1 = socket.Poll(1000, SelectMode.SelectRead);
        bool part2 = (0 == socket.Available);
        return part1 && part2 ? false : true;
      }
      catch(Exception)
      {
        return false;
      }
    }
  }
}