/*

Copyright (C) 2011-2017 Michael Goffioul

This file is part of Octave.

Octave 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.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QMutex>
#include <QMutexLocker>
#include <QProcessEnvironment>

#include <cstdio>

#include "Logger.h"

namespace QtHandles
{

  Logger* Logger::s_instance = 0;
  QMutex* Logger::s_mutex = 0;

  Logger::Logger (void)
    : m_debugEnabled (false)
  {
    QProcessEnvironment pe (QProcessEnvironment::systemEnvironment ());

    if (pe.value ("QTHANDLES_DEBUG", "0") != "0")
      m_debugEnabled = true;
  }

  Logger::~Logger (void)
  { }

  Logger*
  Logger::instance (void)
  {
    if (! s_instance)
      {
        s_instance = new Logger ();
        s_mutex = new QMutex ();
      }

    return s_instance;
  }

#define STATIC_LOGGER(fun) \
  void Logger::fun (const char* fmt, ...) \
  { \
    QMutexLocker lock (s_mutex); \
    va_list vl; \
    va_start (vl, fmt); \
    instance ()->fun ## V (fmt, vl); \
    va_end (vl); \
  }

  STATIC_LOGGER (debug)

  void
  Logger::debugV (const char* fmt, va_list arg)
  {
    if (m_debugEnabled)
      {
        vfprintf (stderr, fmt, arg);
        fprintf (stderr, "\n");
      }
  }

}