//
// This file is part of the Marble Virtual Globe.
//
// This program is free software licensed under the GNU LGPL. You can
// find a copy of this license in LICENSE.txt in the top directory of
// the source code.
//
// Copyright 2012      Mayank Madan <maddiemadan@gmail.com>
//

#include "KmlScreenOverlayWriter.h"

#include "GeoDataScreenOverlay.h"
#include "GeoDataTypes.h"
#include "GeoWriter.h"
#include "GeoTagWriter.h"
#include "KmlOverlayTagWriter.h"
#include "KmlElementDictionary.h"

namespace Marble
{
static GeoTagWriterRegistrar s_writerLookAt(
        GeoTagWriter::QualifiedName( GeoDataTypes::GeoDataScreenOverlayType,
                                     kml::kmlTag_nameSpace22 ),
        new KmlScreenOverlayWriter );

KmlScreenOverlayWriter::KmlScreenOverlayWriter() : KmlOverlayTagWriter( kml::kmlTag_ScreenOverlay )
{
    // nothing to do
}


bool KmlScreenOverlayWriter::writeMid( const GeoNode *node, GeoWriter& writer ) const
{
    KmlOverlayTagWriter::writeMid( node, writer );

    const GeoDataScreenOverlay *screenOverlay = static_cast<const GeoDataScreenOverlay*>( node );
    writeVec2( kml::kmlTag_overlayXY, screenOverlay->overlayXY(), writer );
    writeVec2( kml::kmlTag_rotationXY, screenOverlay->rotationXY(), writer );
    writeVec2( kml::kmlTag_screenXY, screenOverlay->screenXY(), writer );
    writeVec2( kml::kmlTag_size, screenOverlay->size(), writer );
    QString const rotation = QString::number(screenOverlay->rotation());
    writer.writeOptionalElement( kml::kmlTag_rotation, rotation, "0" );
    return true;
}

void KmlScreenOverlayWriter::writeVec2( const QString &element, const GeoDataVec2 &vec2, GeoWriter &writer ) const
{
    writer.writeStartElement( element );
    writer.writeAttribute( "x", QString::number( vec2.x() ) );
    writer.writeAttribute( "xunits", unitToString( vec2.xunit() ) );
    writer.writeAttribute( "y", QString::number( vec2.y() ) );
    writer.writeAttribute( "yunits", unitToString( vec2.yunit() ) );
    writer.writeEndElement();
}

QString KmlScreenOverlayWriter::unitToString( GeoDataVec2::Unit unit ) const
{
    switch( unit ) {
    case GeoDataVec2::Fraction:    return "fraction";
    case GeoDataVec2::Pixels:      return "pixels";
    case GeoDataVec2::InsetPixels: return "insetPixels";
    }

    Q_ASSERT(false);
    return "fraction";
}

}
