#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Communication.Data;

namespace HeuristicLab.Communication.Operators {
  public class TcpNetworkInitiator : OperatorBase {

    public override string Description {
      get { return @"Initiates a TCP socket, it opens one socket for sending and one socket for listening as specified in the configuration"; }
    }

    public TcpNetworkInitiator() {
      AddVariableInfo(new VariableInfo("DriverConfiguration", "A configuration object", typeof(TcpNetworkDriverConfiguration), VariableKind.In));
      AddVariableInfo(new VariableInfo("NetworkConnection", "A connection object", typeof(SocketData), VariableKind.New));
    }

    public override IOperation Apply(IScope scope) {
      TcpNetworkDriverConfiguration config = GetVariableValue<TcpNetworkDriverConfiguration>("DriverConfiguration", scope, true);
      SocketData socket = new SocketData();
      socket.Initialize(config);
      while (!socket.Connect()) ;
      try {
        socket.Write("REQUEST_CONNECT");
        if (!socket.Read().Equals("REQUEST_CONNECT")) throw new InvalidOperationException("ERROR in TcpNetworkInitiator: Remote host answered with unknown response!");
        socket.Write("ACK");
        if (!socket.Read().Equals("ACK")) throw new InvalidOperationException("ERROR in TcpNetworkInitiator: Remote host answered with unknown response!");
      } catch (Exception) {
        try {
          socket.Close();
        } catch (Exception) { }
        return new AtomicOperation(this, scope);
      }

      IVariableInfo info = GetVariableInfo("NetworkConnection");
      if (info.Local)
        AddVariable(new Variable(info.ActualName, socket));
      else
        scope.AddVariable(new Variable(scope.TranslateName(info.FormalName), socket));

      return null;
    }
  }
}