//   rdjsonframer.cpp
//
//   Frame an unsynchronized stream of JSON messages
//
//   (C) Copyright 2024 Fred Gleason <fredg@paravelsystems.com>
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU Library General Public License 
//   version 2 as published by the Free Software Foundation.
//
//   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., 675 Mass Ave, Cambridge, MA 02139, USA.
//

#include "rdjsonframer.h"

RDJsonFramer::RDJsonFramer(QTcpSocket *in_sock,QObject *parent)
  : QObject(parent)
{
  d_escaped=false;
  d_quoted=false;
  d_level=0;
  d_socket=in_sock;
  connect(d_socket,SIGNAL(readyRead()),this,SLOT(readyReadData()));
}


RDJsonFramer::RDJsonFramer(QObject *parent)
  : QObject(parent)
{
  d_escaped=false;
  d_quoted=false;
  d_level=0;
  d_socket=NULL;
}


RDJsonFramer::~RDJsonFramer()
{
  if(d_socket!=NULL) {
    delete d_socket;
  }
}


QByteArray RDJsonFramer::currentDocument() const
{
  return d_current_document;
}


void RDJsonFramer::write(const QByteArray &data)
{
  for(int i=0;i<data.size();i++) {
    QChar c=data.at(i);

    d_data+=c;

    if((c.cell()=='\\')&&(!d_escaped)) {
      d_escaped=true;
    }
    else {
      switch(c.cell()) {
      case '{':
	if(!d_quoted) {
	  d_level++;
	}
	break;

      case '}':
	if(!d_quoted) {
	  if(--d_level==0) {
	    d_current_document=d_data+"\n";
	    d_escaped=false;
	    d_quoted=false;
	    d_level=0;
	    d_data.clear();
	    emit documentReceived(d_current_document);
	  }
	}
	break;

      case '"':
	if(!d_escaped) {
	  d_quoted=!d_quoted;
	}
	break;
      }
      d_escaped=false;
    }
  }
}


void RDJsonFramer::reset()
{
  d_escaped=false;
  d_quoted=false;
  d_level=0;
  d_data.clear();

  emit documentReset();  
}


void RDJsonFramer::readyReadData()
{
  write(d_socket->readAll());
}