// ChatProcessData.cs
// Copyright (C) 2002 Matt Zyzik (www.FileScope.com)
// 
// This program 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 2 of the License, or
// (at your option) any later version.
// 
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

using System.Text;

namespace FileScope
{
    /// <summary>
    /// Used for processing data we just received from our peer.
    /// All messages end with a '\n'.
    /// </summary>
    public class ChatProcessData
    {
        /// <summary>
        /// Take care of the new data we received.
        /// Put incomplete data back into chats[chatNum].buf.
        /// </summary>
        public static void NewData(int chatNum)
        {
            byte[] msgs;
            lock (ChatManager.chats[chatNum].buf)
            {
                msgs = new byte[ChatManager.chats[chatNum].buf.Count];
                ChatManager.chats[chatNum].buf.CopyTo(msgs);
                ChatManager.chats[chatNum].buf.Clear();
            }
            string strMsgs = Encoding.ASCII.GetString(msgs);

            for (;;)
            {
                if (strMsgs.Length == 0)
                    return;

                //are we waiting for a handshake or a chat message
                if (ChatManager.chats[chatNum].state == ChatState.Connected)
                {
                    if (strMsgs.IndexOf("\r\n\r\n") == -1)
                    {
                        //we didn't finish getting the handshake
                        lock (ChatManager.chats[chatNum].buf)
                            ChatManager.chats[chatNum].buf.InsertRange(0, msgs);
                        return;
                    }
                    else
                    {
                        if (strMsgs.ToLower().IndexOf("ok") != -1)
                        {
                            if (ChatManager.chats[chatNum].incoming)
                            {
                                GUIBridge.NewChat(chatNum, ChatManager.chats[chatNum].RemoteIP());
                                //we just received the rest of the handshake
                                ChatManager.chats[chatNum].state = ChatState.HndShk;
                                ChatManager.chats[chatNum].connectYet.Stop();
                                return;
                            }
                            else
                            {
                                //we send the last part of the handshake
                                ChatHandShake.SendFinalResponse(chatNum);
                                ChatManager.chats[chatNum].state = ChatState.HndShk;
                                ChatManager.chats[chatNum].connectYet.Stop();
                                //notify gui that the handshake is done
                                GUIBridge.ConnectedChat(chatNum);
                                return;
                            }
                        }
                        else
                            return;
                    }
                }
                else
                {
                    if (strMsgs.IndexOf("\n") == -1)
                    {
                        //we didn't get the rest of the chat message
                        msgs = Encoding.ASCII.GetBytes(strMsgs);
                        lock (ChatManager.chats[chatNum].buf)
                            ChatManager.chats[chatNum].buf.InsertRange(0, msgs);
                        return;
                    }
                    else
                    {
                        //get the chat message
                        string msg = strMsgs.Substring(0, strMsgs.IndexOf("\n"));
                        if (msg[msg.Length - 1] == '\r')
                            msg = msg.Substring(0, msg.Length - 1);
                        GUIBridge.NewChatData(chatNum, msg);

                        int loc = strMsgs.IndexOf("\n") + 1;
                        strMsgs = strMsgs.Substring(loc, strMsgs.Length - loc);
                    }
                }
            }
        }
    }
}