// This file is part of the Noddybox.WindowsPhone C# suite.
//
// Noddybox.Emulation 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.
//
// Noddybox.Emulation 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 Noddybox.Emulation.  If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (c) 2012 Ian Cowburn
//
using System;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace Noddybox.WindowsPhone.Net
{
	/// <summary>
	/// Provides a wrapper around a stream to interact with servers
	/// </summary>
	public class ServerDialog
	{
		// -------------------------------------------------
		// - PUBLIC MEMBERS                                -
		// -------------------------------------------------
		
		/// <summary>
		/// Used for returns from the server
		/// </summary>
		public class Reply
		{
			/// <summary>
			/// Default constructor - initializes all fields to default values
			/// </summary>
			public Reply()
			{
				m_code=-1;
				m_text="";
			}
			
			/// <summary>
			/// The code returned by the server
			/// </summary>
			public int Code
			{
				get {return m_code;}
				set {m_code=value;}
			}
			
			/// <summary>
			/// The text returned by the server
			/// </summary>
			public string Text
			{
				get {return m_text;}
				set {m_text=value;}
			}

			private int		m_code;
			private string	m_text;
			
		}
		
		/// <summary>
		/// Default constructor - initializes all fields to default values
		/// </summary>
		public ServerDialog()
		{
			m_encode=new System.Text.ASCIIEncoding();
			m_code=new Regex("^[0-9][0-9][0-9]");
			m_code_end=new Regex("^[0-9][0-9][0-9][^-]");

		}
		
		/// <summary>
		/// Sends a command to the server and returns the reply
		/// </summary>
		public Reply Send(Stream str, string command)
		{
			Reply r=new Reply();
			
			if (command!=null)
			{
				byte[] b=ToBytes(command);
			
				str.Write(b,0,b.Length);
			}
			
			GetResult(str,r);
			    
			return r;
		}
		
		// -------------------------------------------------
		// - PRIVATE MEMBERS                               -
		// -------------------------------------------------
		
		private ASCIIEncoding	m_encode;
		private Regex 			m_code;
		private Regex 			m_code_end;


		
		private byte[] ToBytes(string s)
		{
			return m_encode.GetBytes(s);
		}
		
		private string GetLine(Stream str)
		{
			byte[] b=new byte[1];
			int c;
			string r="";
			
			while((c=str.ReadByte())!=-1)
			{
				b[0]=(byte)c;
				r+=m_encode.GetString(b);
				
				if (c==10)
				{
					break;
				}
			}
			
			return r;
		}
		
		private void GetResult(Stream str, Reply r)
		{
			string s;
			string all="";
			bool first_line=true;

			do
			{
				s=GetLine(str);
				
				if (first_line)
				{
					if (m_code.IsMatch(s))
					{
						r.Code=Convert.ToInt32(s.Substring(0,3));
					}
					else
					{
						throw new NetException(NetException.Type.ALL_NoReplyCode);
					}
					
					first_line=false;
				}

				if (m_code.IsMatch(s))
				{
					all+=s.Substring(4);
				}
				else
				{
					all+=s;
				}
				
			} while (!m_code_end.IsMatch(s));
			
			all=all.TrimEnd(null);
			r.Text=all;
		}

	}
}