/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2017     Statoil ASA
// 
//  ResInsight 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 3 of the License, or
//  (at your option) any later version.
// 
//  ResInsight 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 at <http://www.gnu.org/licenses/gpl.html> 
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RiaColorTools.h"
#include "cvfMath.h"
#include <algorithm>

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
bool RiaColorTools::isBrightnessAboveThreshold(cvf::Color3f backgroundColor)
{
    if (backgroundColor.r() + backgroundColor.g() + backgroundColor.b() > 1.5f)
    {
        return true;
    }

    return false;
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
cvf::Color3f RiaColorTools::computeOffsetColor(cvf::Color3f color, float offsetFactor)
{
    float gridR = 0.0;
    float gridG = 0.0;
    float gridB = 0.0;

    if (isBrightnessAboveThreshold(color))
    {
        gridR = color.r() - (color.r() * offsetFactor);
        gridG = color.g() - (color.g() * offsetFactor);
        gridB = color.b() - (color.b() * offsetFactor);
    }
    else
    {
        gridR = color.r() + (1.0f - color.r()) * offsetFactor;
        gridG = color.g() + (1.0f - color.g()) * offsetFactor;
        gridB = color.b() + (1.0f - color.b()) * offsetFactor;
    }

    return cvf::Color3f(cvf::Math::clamp(gridR, 0.0f, 1.0f),
                        cvf::Math::clamp(gridG, 0.0f, 1.0f),
                        cvf::Math::clamp(gridB, 0.0f, 1.0f));
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
cvf::Color3f RiaColorTools::darkContrastColor()
{
    return cvf::Color3f::fromByteColor(10, 10, 10);
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
cvf::Color3f RiaColorTools::brightContrastColor()
{
    return cvf::Color3f::WHITE;
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
cvf::Color3f RiaColorTools::constrastColor(cvf::Color3f backgroundColor)
{
    if (isBrightnessAboveThreshold(backgroundColor))
    {
        return darkContrastColor();
    }
 
    return brightContrastColor();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QColor RiaColorTools::toQColor(cvf::Color3f color, float alpha)
{
    QColor qcolor(color.rByte(), color.gByte(), color.bByte());
    qcolor.setAlphaF(alpha);
    return qcolor;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QColor RiaColorTools::toQColor(cvf::Color4f color)
{
    return toQColor(color.toColor3f(), color.a());
}