/*=========================================================================

  Library:   CTK

  Copyright (c) Kitware Inc.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.commontk.org/LICENSE

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

=========================================================================*/

// Qt includes
#include <QDir>
#include <QDebug>

// CTK includes
#include "ctkAbstractPythonManager.h"
#include "ctkScriptingPythonCoreConfigure.h"

// PythonQT includes
#include <PythonQt.h>

// STD includes
#include <csignal>

#ifdef __GNUC__
// Disable warnings related to signal() function
// See http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html
// Note: Ideally the incriminated functions and macros should be fixed upstream ...
#pragma GCC diagnostic ignored "-Wold-style-cast"
#endif

#ifdef CTK_PYTHONQT_WRAP_QTGUI
void PythonQt_init_QtGui(PyObject*);
#endif

#ifdef CTK_PYTHONQT_WRAP_QTNETWORK
void PythonQt_init_QtNetwork(PyObject*);
#endif

#ifdef CTK_PYTHONQT_WRAP_QTOPENGL
void PythonQt_init_QtOpenGL(PyObject*);
#endif

#ifdef CTK_PYTHONQT_WRAP_QTSQL
void PythonQt_init_QtSql(PyObject*);
#endif

#ifdef CTK_PYTHONQT_WRAP_QTSVG
void PythonQt_init_QtSvg(PyObject*); 
#endif

#ifdef CTK_PYTHONQT_WRAP_QTUITOOLS
void PythonQt_init_QtUiTools(PyObject*);
#endif

#ifdef CTK_PYTHONQT_WRAP_QTWEBKIT
void PythonQt_init_QtWebKit(PyObject*);
#endif

#ifdef CTK_PYTHONQT_WRAP_QTXML
void PythonQt_init_QtXml(PyObject*);
#endif

#ifdef CTK_PYTHONQT_WRAP_QTXMLPATTERNS
void PythonQt_init_QtXmlPatterns(PyObject*);
#endif

//-----------------------------------------------------------------------------
ctkAbstractPythonManager::ctkAbstractPythonManager(QObject* _parent) : Superclass(_parent)
{

}

//-----------------------------------------------------------------------------
ctkAbstractPythonManager::~ctkAbstractPythonManager()
{
  PythonQt::cleanup();
}

//-----------------------------------------------------------------------------
PythonQtObjectPtr ctkAbstractPythonManager::mainContext()
{
  if (!PythonQt::self())
    {
    this->initPythonQt();
    }
  if (PythonQt::self())
    {
    return PythonQt::self()->getMainModule();
    }
  return PythonQtObjectPtr();
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::initPythonQt()
{
  PythonQt::init(PythonQt::IgnoreSiteModule | PythonQt::RedirectStdOut);

  // Python maps SIGINT (control-c) to its own handler.  We will remap it
  // to the default so that control-c works.
  #ifdef SIGINT
  signal(SIGINT, SIG_DFL);
  #endif

  PythonQtObjectPtr _mainContext = PythonQt::self()->getMainModule();

  this->connect(PythonQt::self(), SIGNAL(pythonStdOut(const QString&)),
                SLOT(printStdout(const QString&)));
  this->connect(PythonQt::self(), SIGNAL(pythonStdErr(const QString&)),
                SLOT(printStderr(const QString&)));
  
  #ifdef CTK_PYTHONQT_WRAP_QTGUI
  PythonQt_init_QtGui(0);
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTNETWORK
  PythonQt_init_QtNetwork(0);
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTOPENGL
  PythonQt_init_QtOpenGL(0);
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTSQL
  PythonQt_init_QtSql(0);
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTSVG
  PythonQt_init_QtSvg(0); 
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTUITOOLS
  PythonQt_init_QtUiTools(0);
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTWEBKIT
  PythonQt_init_QtWebKit(0);
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTXML
  PythonQt_init_QtXml(0);
  #endif

  #ifdef CTK_PYTHONQT_WRAP_QTXMLPATTERNS
  PythonQt_init_QtXmlPatterns(0);
  #endif
  
  QStringList initCode;
  initCode << "import sys";
  foreach (QString path, this->pythonPaths())
    {
    initCode << QString("sys.path.append('%1')").arg(QDir::fromNativeSeparators(path));
    }

  _mainContext.evalScript(initCode.join("\n"));

  this->preInitialization();

  emit this->pythonInitialized();
}

//-----------------------------------------------------------------------------
QStringList ctkAbstractPythonManager::pythonPaths()
{
  return QStringList();
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::preInitialization()
{
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::registerPythonQtDecorator(QObject* decorator)
{
  PythonQt::self()->addDecorators(decorator);
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::registerClassForPythonQt(const QMetaObject* metaobject)
{
  PythonQt::self()->registerClass(metaobject);
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::registerCPPClassForPythonQt(const char* name)
{
  PythonQt::self()->registerCPPClass(name);
}

//-----------------------------------------------------------------------------
QVariant ctkAbstractPythonManager::executeString(const QString& code)
{
  QVariant ret;
  PythonQtObjectPtr main = ctkAbstractPythonManager::mainContext();
  if (main)
    {
    ret = main.evalScript(code, Py_single_input);
    }
  return ret;
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::executeFile(const QString& filename)
{
  PythonQtObjectPtr main = ctkAbstractPythonManager::mainContext();
  if (main)
    {
    main.evalFile(filename);
    }
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::addObjectToPythonMain(const QString& name, QObject* obj)
{
  PythonQtObjectPtr main = ctkAbstractPythonManager::mainContext();
  if (main && obj)
    {
    main.addObject(name, obj);
    }
}

//-----------------------------------------------------------------------------
QVariant ctkAbstractPythonManager::getVariable(const QString& name)
{
  PythonQtObjectPtr main = ctkAbstractPythonManager::mainContext();
  if (main)
    {
    return PythonQt::self()->getVariable(main, name);
    }
  return QVariant();
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::printStdout(const QString& text)
{
  std::cout << qPrintable(text);
}

//-----------------------------------------------------------------------------
void ctkAbstractPythonManager::printStderr(const QString& text)
{
  std::cout << qPrintable(text);
}