/*
  injectorstyleplugin.cpp

  This file is part of GammaRay, the Qt application inspection and
  manipulation tool.

  Copyright (C) 2010-2015 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
  Author: Volker Krause <volker.krause@kdab.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, see <http://www.gnu.org/licenses/>.
*/

#include "injectorstyleplugin.h"

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
#include <private/qguiplatformplugin_p.h> //krazy:exclude=camelcase
#else
#include <qpa/qplatformtheme.h>           //krazy:exclude=camelcase
#include <private/qguiapplication_p.h>    //krazy:exclude=camelcase
#endif

#include <QDebug>
#include <QLibrary>
#include <QStyleFactory>

#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
typedef void *QFunctionPointer;
#endif

using namespace GammaRay;

QStyle *InjectorStylePlugin::create(const QString &)
{
  inject();
#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
  static QGuiPlatformPlugin defaultGuiPlatform;
  return QStyleFactory::create(defaultGuiPlatform.styleName());
#else
  const QStringList styleNameList =
    QGuiApplicationPrivate::platform_theme->themeHint(
      QPlatformTheme::StyleNames).toStringList();
  foreach (const QString &styleName, styleNameList) {
    if (QStyle *style = QStyleFactory::create(styleName)) {
      return style;
    }
  }
  return 0;
#endif
}

QStringList InjectorStylePlugin::keys() const
{
  return QStringList() << QLatin1String("gammaray-injector");
}

void InjectorStylePlugin::inject()
{
  const QByteArray probeDllPath = qgetenv("GAMMARAY_STYLEINJECTOR_PROBEDLL");
  if (probeDllPath.isEmpty()) {
    qWarning("No probe DLL specified.");
    return;
  }

  QLibrary probeDll(QString::fromLocal8Bit(probeDllPath));
  probeDll.setLoadHints(QLibrary::ResolveAllSymbolsHint);
  if (!probeDll.load()) {
    qWarning() << "Loading probe DLL failed:" << probeDll.errorString();
    return;
  }

  const QByteArray probeFunc = qgetenv("GAMMARAY_STYLEINJECTOR_PROBEFUNC");
  if (probeFunc.isEmpty()) {
    qWarning("No probe function specified.");
    return;
  }

  QFunctionPointer probeFuncHandle = probeDll.resolve(probeFunc);
  if (probeFuncHandle) {
    reinterpret_cast<void(*)()>(probeFuncHandle)();
  } else {
    qWarning() << "Resolving probe function failed:" << probeDll.errorString();
  }
}

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
Q_EXPORT_PLUGIN2(gammaray_injector_style, GammaRay::InjectorStylePlugin)
#endif

