/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <preview_items/selection_area.h>

#include <gal/graphics_abstraction_layer.h>
#include <painter.h>
#include <view/view.h>

using namespace KIGFX::PREVIEW;

struct SELECTION_COLORS
{
    COLOR4D normal;
    COLOR4D additive;
    COLOR4D subtract;
    COLOR4D exclusiveOr;
    COLOR4D outline_l2r;
    COLOR4D outline_r2l;
};

static const SELECTION_COLORS selectionColorScheme[2] = {
    { // dark background
        COLOR4D( 0.3, 0.3, 0.7, 0.3 ), // Slight blue
        COLOR4D( 0.3, 0.7, 0.3, 0.3 ), // Slight green
        COLOR4D( 0.7, 0.3, 0.3, 0.3 ), // Slight red
        COLOR4D( 0.7, 0.3, 0.3, 0.3 ), // Slight red

        COLOR4D( 1.0, 1.0, 0.4, 1.0 ), // yellow
        COLOR4D( 0.4, 0.4, 1.0, 1.0 ) // blue
    },
    { // bright background
        COLOR4D( 0.5, 0.3, 1.0, 0.5 ), // Slight blue
        COLOR4D( 0.5, 1.0, 0.5, 0.5 ), // Slight green
        COLOR4D( 1.0, 0.5, 0.5, 0.5 ), // Slight red
        COLOR4D( 1.0, 0.5, 0.5, 0.5 ), // Slight red

        COLOR4D( 0.7, 0.7, 0.0, 1.0 ), // yellow
        COLOR4D( 0.1, 0.1, 1.0, 1.0 ) // blue
    }
};


SELECTION_AREA::SELECTION_AREA() :
        m_additive( false ),
        m_subtractive( false ),
        m_exclusiveOr( false )
{

}


const BOX2I SELECTION_AREA::ViewBBox() const
{
    BOX2I tmp;

    tmp.SetOrigin( m_origin );
    tmp.SetEnd( m_end );
    tmp.Normalize();
    return tmp;
}


void SELECTION_AREA::ViewDraw( int aLayer, KIGFX::VIEW* aView ) const
{
    auto& gal = *aView->GetGAL();
    auto rs = aView->GetPainter()->GetSettings();

    const auto& scheme =  rs->IsBackgroundDark() ? selectionColorScheme[0] : selectionColorScheme[1];

    // Set the fill of the selection rectangle
    // based on the selection mode
    if( m_additive )
        gal.SetFillColor( scheme.additive  );
    else if( m_subtractive )
        gal.SetFillColor( scheme.subtract );
    else if( m_exclusiveOr )
        gal.SetFillColor( scheme.exclusiveOr );
    else
        gal.SetFillColor( scheme.normal );

    gal.SetIsStroke( true );
    gal.SetIsFill( true );

    // force 1-pixel-wide line
    gal.SetLineWidth( 0.0 );

    // Set the stroke color to indicate window or crossing selection
    bool windowSelection = ( m_origin.x <= m_end.x ) ? true : false;

    if( aView->IsMirroredX() )
        windowSelection = !windowSelection;

    gal.SetStrokeColor( windowSelection ? scheme.outline_l2r : scheme.outline_r2l );
    gal.SetIsFill( false );
    gal.DrawRectangle( m_origin, m_end );
    gal.SetIsFill( true );
    // draw the fill as the second object so that Z test will not clamp
    // the single-pixel-wide rectangle sides
    gal.DrawRectangle( m_origin, m_end );
}