// Npgsql.NpgsqlConnectedState.cs
//
// Author:
// 	Dave Joyner <d4ljoyn@yahoo.com>
//
//	Copyright (C) 2002 The Npgsql Development Team
//	npgsql-general@gborg.postgresql.org
//	http://gborg.postgresql.org/project/npgsql/projdisplay.php
//
//
// 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;
using System.IO;


namespace Npgsql
{
    internal sealed class NpgsqlConnectedState : NpgsqlState
    {

        private static NpgsqlConnectedState _instance = null;

        private NpgsqlConnectedState()
        {}
        public static NpgsqlConnectedState Instance
        {
            get
            {
                if ( _instance == null )
                {
                    _instance = new NpgsqlConnectedState();
                }
                return _instance;
            }
        }
        public override void Startup(NpgsqlConnection context)
        {
            if (context.BackendProtocolVersion == ProtocolVersion.Version3)
            {

                NpgsqlStartupPacket startupPacket  = new NpgsqlStartupPacket(296, //Not used.
                                                     3,
                                                     0,
                                                     context.DatabaseName,
                                                     context.UserName,
                                                     "",
                                                     "",
                                                     "");

                startupPacket.WriteToStream( new BufferedStream(context.Stream), context.Encoding );
                ProcessBackendResponses( context );
            }
            else if (context.BackendProtocolVersion == ProtocolVersion.Version2)
            {

                NpgsqlStartupPacket startupPacket  = new NpgsqlStartupPacket(296,
                                                     2,
                                                     0,
                                                     context.DatabaseName,
                                                     context.UserName,
                                                     "",
                                                     "",
                                                     "");

                startupPacket.WriteToStream( new BufferedStream(context.Stream), context.Encoding );
                ProcessBackendResponses( context );


            }

        }

    }
}