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

 * Copyright (c) 2007 Nikolaj Hald Nielsen <nhn@kde.org>                                *

 * Copyright (c) 2007 Mark Kretschmann <kretschmann@kde.org>                            *

 *                                                                                      *

 * 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 "SvgTinter.h"

#include "App.h"

#include "core/support/Debug.h"

#include <QBuffer>

#include <KFilterDev>

SvgTinter * SvgTinter::s_instance = 0;

SvgTinter::SvgTinter()

    : m_firstRun( true )

{

    init();

    m_firstRun = false;

}

SvgTinter::~SvgTinter()

{}

QString

SvgTinter::tint(QString filename)

{

    QFile file( filename );

    if ( !file.open( QIODevice::ReadOnly ) )

    {

        error() << "Unable to open file: " << filename;

        return QString();

    }

    QByteArray svg_source( file.readAll() );

    // Copied from KSvgrenderer.cpp as we don't load it directly.

    if (!svg_source.startsWith("<?xml"))

    {

        QBuffer buf( &svg_source );

        QIODevice *flt = KFilterDev::device( &buf, QString::fromLatin1("application/x-gzip"), false );

        if (!flt)

            return QString();

        if (!flt->open(QIODevice::ReadOnly))

        {

            delete flt;

            return QString();

        }

        svg_source = flt->readAll();

        delete flt;

    }

    QString svg_string( svg_source );

    const QStringList tintKeys = m_tintMap.keys();

    foreach ( const QString &colorName, tintKeys ) {

        //debug() << "replace " <<  colorName << " with " << m_tintMap.value( colorName );

        svg_string.replace( colorName, m_tintMap.value( colorName ) );

    }

    return svg_string;

}

void

SvgTinter::init()

{

    if ( m_lastPalette != App::instance()->palette() || m_firstRun ) {

        m_tintMap.insert( "#666765", App::instance()->palette().window().color().name() );

        //insert a color for bright ( highlight color )

        m_tintMap.insert( "#66ffff", App::instance()->palette().highlight().color().name() );

        //a slightly lighter than window color:

        m_tintMap.insert( "#e8e8e8", blendColors( App::instance()->palette().window().color(), "#ffffff", 90 ).name() );

        //a slightly darker than window color:

        m_tintMap.insert( "#565755", blendColors( App::instance()->palette().window().color(), "#000000", 90 ).name() );

        //list background:

    #ifdef Q_WS_MAC 

        m_tintMap.insert( "#f0f0f0", blendColors( App::instance()->palette().window().color(), "#000000", 90 ).name() );

        m_tintMap.insert( "#ffffff", blendColors( App::instance()->palette().window().color(), "#000000", 98 ).name() );

    #else

       m_tintMap.insert( "#f0f0f0", App::instance()->palette().base().color().name() );

    #endif

        //alternate list background:

        m_tintMap.insert( "#e0e0e0", App::instance()->palette().alternateBase().color().name() );

        //highlight/window mix:

        m_tintMap.insert( "#123456", blendColors( App::instance()->palette().window().color(), App::instance()->palette().highlight().color().name(), 80 ).name() );

        //text color, useful for adding contrast

        m_tintMap.insert( "#010101", App::instance()->palette().text().color().name() );

        m_lastPalette = App::instance()->palette();

    }

}

QColor

SvgTinter::blendColors( const QColor& color1, const QColor& color2, int percent )

{

    const float factor1 = ( float ) percent / 100;

    const float factor2 = ( 100 - ( float ) percent ) / 100;

    const int r = static_cast<int>( color1.red() * factor1 + color2.red() * factor2 );

    const int g = static_cast<int>( color1.green() * factor1 + color2.green() * factor2 );

    const int b = static_cast<int>( color1.blue() * factor1 + color2.blue() * factor2 );

    QColor result;

    result.setRgb( r, g, b );

    return result;

}

namespace The {

    SvgTinter*

    svgTinter()

    {

        if ( SvgTinter::s_instance == 0 )

            SvgTinter::s_instance = new SvgTinter();

        return SvgTinter::s_instance;

    }

}