// This code is derived from jcifs smb client library <jcifs at samba dot org>
// Ported by J. Arturo <webmaster at komodosoft dot net>
//  
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
using System.IO;

namespace SharpCifs.Netbios
{

    public class NbtException : IOException
    {
        public const int Success = 0;

        public const int ErrNamSrvc = unchecked(0x01);

        public const int ErrSsnSrvc = unchecked(0x02);

        public const int FmtErr = unchecked(0x1);

        public const int SrvErr = unchecked(0x2);

        public const int ImpErr = unchecked(0x4);

        public const int RfsErr = unchecked(0x5);

        public const int ActErr = unchecked(0x6);

        public const int CftErr = unchecked(0x7);

        public const int ConnectionRefused = -1;

        public const int NotListeningCalled = unchecked(0x80);

        public const int NotListeningCalling = unchecked(0x81);

        public const int CalledNotPresent = unchecked(0x82);

        public const int NoResources = unchecked(0x83);

        public const int Unspecified = unchecked(0x8F);

        public int ErrorClass;

        public int ErrorCode;

        // error classes
        // name service error codes
        // session service error codes
        public static string GetErrorString(int errorClass, int errorCode)
        {
            string result = string.Empty;
            switch (errorClass)
            {
                case Success:
                    {
                        result += "SUCCESS";
                        break;
                    }

                case ErrNamSrvc:
                    {
                        result += "ERR_NAM_SRVC/";
                        switch (errorCode)
                        {
                            case FmtErr:
                                {
                                    result += "FMT_ERR: Format Error";
                                    goto default;
                                }

                            default:
                                {
                                    result += "Unknown error code: " + errorCode;
                                    break;
                                }
                        }
                        break;
                    }

                case ErrSsnSrvc:
                    {
                        result += "ERR_SSN_SRVC/";
                        switch (errorCode)
                        {
                            case ConnectionRefused:
                                {
                                    result += "Connection refused";
                                    break;
                                }

                            case NotListeningCalled:
                                {
                                    result += "Not listening on called name";
                                    break;
                                }

                            case NotListeningCalling:
                                {
                                    result += "Not listening for calling name";
                                    break;
                                }

                            case CalledNotPresent:
                                {
                                    result += "Called name not present";
                                    break;
                                }

                            case NoResources:
                                {
                                    result += "Called name present, but insufficient resources";
                                    break;
                                }

                            case Unspecified:
                                {
                                    result += "Unspecified error";
                                    break;
                                }

                            default:
                                {
                                    result += "Unknown error code: " + errorCode;
                                    break;
                                }
                        }
                        break;
                    }

                default:
                    {
                        result += "unknown error class: " + errorClass;
                        break;
                    }
            }
            return result;
        }

        public NbtException(int errorClass, int errorCode) : base(GetErrorString(errorClass
            , errorCode))
        {
            this.ErrorClass = errorClass;
            this.ErrorCode = errorCode;
        }

        public override string ToString()
        {
            return "errorClass=" + ErrorClass 
                + ",errorCode=" + ErrorCode 
                + ",errorString=" + GetErrorString(ErrorClass, ErrorCode);
        }
    }
}