/****************************************************************************

 Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.

 This file is part of the QGLViewer library version 2.3.4.

 http://www.libqglviewer.com - contact@libqglviewer.com

 This file may be used under the terms of the GNU General Public License 
 versions 2.0 or 3.0 as published by the Free Software Foundation and
 appearing in the LICENSE file included in the packaging of this file.
 In addition, as a special exception, Gilles Debunne gives you certain 
 additional rights, described in the file GPL_EXCEPTION in this package.

 libQGLViewer uses dual licensing. Commercial/proprietary software must
 purchase a libQGLViewer Commercial License.

 This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

*****************************************************************************/


#if QT_VERSION > 0x040000
# include <QGlobal>
# include <QDomElement>
# include <QString>
# include <QStringList>
# include <QColor>
#else
# include <qapplication.h>
# include <qdom.h>
# include <qstring.h>
# include <qstringlist.h>
# include <qcolor.h>
#endif

#include <math.h>

#ifndef DOXYGEN

// QDomElement loading with syntax checking.
class DomUtils
{
private:
  static void warning(const QString& message)
  {
#if QT_VERSION >= 0x040000
    qWarning("%s", message.toLatin1().constData());
#else
    qWarning("%s", message.latin1());
#endif
  }

public:
  static float floatFromDom(const QDomElement& e, const QString& attribute, float defValue)
  {
    float value = defValue;
    if (e.hasAttribute(attribute))
      {
	const QString s = e.attribute(attribute);
	bool ok;
	s.toFloat(&ok);
	if (ok)
	  value = s.toFloat();
	else
	  warning("Bad float syntax for attribute \""+attribute+"\" in initialization of \""+e.tagName()+"\". Setting value to "+QString::number(value)+".");
      }
    else
      warning("\""+attribute+"\" attribute missing in initialization of \""+e.tagName()+"\". Setting value to "+QString::number(value)+".");

#if defined(isnan)
    // The "isnan" method may not be available on all platforms.
    // Find its equivalent or simply remove these two lines
    if (isnan(value))
      warning("Warning, attribute \""+attribute+"\" initialized to Not a Number in \""+e.tagName()+"\"");
#endif

    return value;
  }

  static int intFromDom(const QDomElement& e, const QString& attribute, int defValue)
  {
    int value = defValue;
    if (e.hasAttribute(attribute))
      {
	const QString s = e.attribute(attribute);
	bool ok;
	s.toInt(&ok);
	if (ok)
	  value = s.toInt();
	else
	  warning("Bad integer syntax for attribute \""+attribute+"\" in initialization of \""+e.tagName()+"\". Setting value to "+QString::number(value)+".");
      }
    else
      warning("\""+attribute+"\" attribute missing in initialization of \""+e.tagName()+"\". Setting value to "+QString::number(value)+".");
    return value;
  }

  static bool boolFromDom(const QDomElement& e, const QString& attribute, bool defValue)
  {
    bool value = defValue;
    if (e.hasAttribute(attribute))
      {
	const QString s = e.attribute(attribute);
#if QT_VERSION >= 0x040000
	if (s.toLower() == QString("true"))
#else
	if (s.lower() == QString("true"))
#endif
	  value = true;
#if QT_VERSION >= 0x040000
	else if (s.toLower() == QString("false"))
#else
	else if (s.lower() == QString("false"))
#endif
	  value = false;
	else
	  {
	    warning("Bad boolean syntax for attribute \""+attribute+"\" in initialization of \""+e.tagName()+"\" (should be \"true\" or \"false\").");
	    warning("Setting value to "+(value?QString("true."):QString("false.")));
	  }
      }
    else
      warning("\""+attribute+"\" attribute missing in initialization of \""+e.tagName()+"\". Setting value to "+(value?QString("true."):QString("false.")));
    return value;
  }

  static QDomElement QColorDomElement(const QColor& color, const QString& name, QDomDocument& doc)
  {
    QDomElement de = doc.createElement(name);
    de.setAttribute("red", QString::number(color.red()));
    de.setAttribute("green", QString::number(color.green()));
    de.setAttribute("blue", QString::number(color.blue()));
    return de;
  }

  static QColor QColorFromDom(const QDomElement& e)
  {
    int color[3];
    QStringList attribute;
    attribute << "red" << "green" << "blue";
#if QT_VERSION >= 0x040000
    for (int i=0; i<attribute.count(); ++i)
#else
    for (unsigned int i=0; i<attribute.count(); ++i)
#endif
      color[i] = DomUtils::intFromDom(e, attribute[i], 0);
    return QColor(color[0], color[1], color[2]);
  }
};

#endif // DOXYGEN
