// created on 9/6/2002 at 16:56


// Npgsql.NpgsqlStartupPacket.cs
// 
// Author:
//	Francisco Jr. (fxjrlists@yahoo.com.br)
//
//	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;
using System.Text;
using System.Net;

namespace Npgsql
{
	
	/// <summary>
	/// This class represents a StartupPacket message of PostgreSQL
	/// protocol.
	/// </summary>
	/// 
	internal sealed class NpgsqlStartupPacket
	{
		
		// Logging related values
    private static readonly String CLASSNAME = "NpgsqlStartupPacket";
		
		// Private fields.
		private Int32 packet_size;
		private Int32 protocol_version;
		private String database_name;
		private String user_name;
		private String arguments;
		private String unused;
		private String optional_tty;
				
		public NpgsqlStartupPacket(Int32 packet_size, 
		                           Int32 protocol_version_major,
		                           Int32 protocol_version_minor,
		                           String database_name, 
		                           String user_name,
		                           String arguments,
		                           String unused,
		                           String optional_tty)
		{
			
			NpgsqlEventLog.LogMsg("Entering " + CLASSNAME + ".NpgsqlStartupPacket()", LogLevel.Debug);
			// Just copy the values.
			
			// [FIXME] Validate params? We are the only clients, so, hopefully, we
			// know what to send.
			
			this.packet_size = packet_size;
		  this.protocol_version = (protocol_version_major<<16) | protocol_version_minor; 
			this.database_name = database_name;
		  this.user_name = user_name;
		  this.arguments = arguments;
			this.unused = unused;
		  this.optional_tty = optional_tty;
			
		}
		
		public void WriteToStream(Stream output_stream, Encoding encoding)
		{
			
			NpgsqlEventLog.LogMsg("Entering " + CLASSNAME + ".WriteToStream()", LogLevel.Debug);
			
			// [FIXME] Need exception handling ?
			
			// Packet length = 296
      output_stream.Write(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(this.packet_size)), 0, 4);
	    	
      // Protocol version = 2.0
      output_stream.Write(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(this.protocol_version)), 0, 4);
	    	
      // Database name.
			PGUtil.WriteLimString(this.database_name, 64, output_stream, encoding);
      
      // User name.
      PGUtil.WriteLimString(this.user_name, 32, output_stream, encoding);
    	
    	// Arguments.
    	PGUtil.WriteLimString(this.arguments, 64, output_stream, encoding);
			
      // Unused.
      PGUtil.WriteLimString(this.unused, 64, output_stream, encoding);
      
      // Optional tty.
      PGUtil.WriteLimString(this.optional_tty, 64, output_stream, encoding);
			
			
		}
	}
}