/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 * This file may be used under the terms of the QSkinny License, Version 1.0
 *****************************************************************************/

#include "QskRgbPalette.h"
#include "QskRgbValue.h"
#include "QskGradient.h"

#define RGB( color, weight ) color ## weight

#define RGBTABLE( c ) \
    { \
        RGB( c, 0 ),  RGB( c, 10 ), RGB( c, 20 ), RGB( c, 30 ), RGB( c, 40 ), \
        RGB( c, 50 ), RGB( c, 60 ), RGB( c, 70 ), RGB( c, 80 ), RGB( c, 90 ), \
        RGB( c, 95 ), RGB( c, 99 ), RGB( c, 100 ) \
    }

namespace
{
    class Palette : public QskRgbPalette
    {
      public:
        Palette( int index )
        {
            using namespace QskRgb;

            static constexpr QRgb table[][ Palette::NumWeights ] =
            {
                RGBTABLE( DefaultMaterialPrimary ),
                RGBTABLE( DefaultMaterialSecondary ),
                RGBTABLE( DefaultMaterialTertiary ),
                RGBTABLE( DefaultMaterialError ),
                RGBTABLE( DefaultMaterialNeutral ),
                RGBTABLE( DefaultMaterialNeutralVariant ),
            };

            const int count = sizeof( table ) / sizeof( table[ 0 ] );
            m_rgb = table[ qBound( 0, index, count ) ];
        }
    };
}

QskRgbPalette QskRgbPalette::palette( Theme theme )
{
    return Palette( static_cast< int >( theme ) );
}

static QskGradientStops qskColorStops(
    const QRgb* rgb, int count, bool discrete )
{
    QskGradientStops stops;

    if ( discrete )
        stops.reserve( 2 * count - 2 );
    else
        stops.reserve( count );

    stops += QskGradientStop( 0.0, rgb[0] );

    if ( discrete )
    {
        const auto step = 1.0 / count;

        for ( int i = 1; i < count; i++ )
        {
            const qreal pos = i * step;
            stops += QskGradientStop( pos, rgb[i - 1] );
            stops += QskGradientStop( pos, rgb[i] );
        }
    }
    else
    {
        const auto step = 1.0 / ( count - 1 );

        for ( int i = 1; i < count - 1; i++ )
            stops += QskGradientStop( i * step, rgb[i] );
    }

    stops += QskGradientStop( 1.0, rgb[count - 1] );

    return stops;
}

QskGradientStops QskRgbPalette::colorStops( bool discrete ) const
{
    return qskColorStops( m_rgb, NumWeights, discrete );
}

QskGradientStops QskRgbPalette::colorStops( Theme theme, bool discrete )
{
    const auto pal = QskRgbPalette::palette( theme );
    return pal.colorStops( discrete );
}

QskGradientStops QskRgbPalette::colorStops(
    const QVector< QRgb >& rgb, bool discrete )
{
    const int count = rgb.count();

    if ( count == 0 )
        return QskGradientStops();

    if ( count == 0 )
    {
        QskGradientStops stops;
        stops.reserve( 2 );

        stops += QskGradientStop( 0.0, rgb[0] );
        stops += QskGradientStop( 1.0, rgb[0] );

        return stops;
    }

    return qskColorStops( rgb.constData(), count, discrete );
}

#include "moc_QskRgbPalette.cpp"