/*  MiniPreviewPixmap.cpp
 *
 *  Copyright (C) 2013-2016  Jaye Evins <evins@snaught.com>
 *
 *  This file is part of gLabels-qt.
 *
 *  gLabels-qt 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.
 *
 *  gLabels-qt 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 gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "MiniPreviewPixmap.h"


#include "RollTemplatePath.h"
#include "model/Template.h"


namespace glabels
{

	//
	// Private
	//
	namespace
	{
		const QColor paperColor( 217, 217, 217 );
		const QColor paperOutlineColor( 0, 0, 0 );
		const double paperOutlineWidthPixels = 1.0;

		const QColor labelColor( 242, 242, 242 );
		const QColor labelOutlineColor( 64, 64, 64 );
		const double labelOutlineWidthPixels = 1.0;
	}


	MiniPreviewPixmap::MiniPreviewPixmap()
	{
		// empty
	}


	MiniPreviewPixmap::MiniPreviewPixmap( const model::Template& tmplate, int width, int height )
		: QPixmap( width, height )
	{
		draw( tmplate, width, height );
	}


	void MiniPreviewPixmap::draw( const model::Template& tmplate, int width, int height )
	{
		fill( Qt::transparent );

		QPainter painter( this );

		painter.setBackgroundMode( Qt::TransparentMode );
		painter.setRenderHint( QPainter::Antialiasing, true );

		// For "Roll" templates, allow extra room for tape width and continuation break lines
		model::Distance drawWidth  = tmplate.pageWidth();
		model::Distance drawHeight = tmplate.pageHeight();
		if ( tmplate.isRoll() )
		{
			drawWidth   = tmplate.rollWidth();
			drawHeight *= 1.2;
		}

		double w = width - 1;
		double h = height - 1;
		double scale;
		if ( (w/drawWidth.pt()) > (h/drawHeight.pt()) )
		{
			scale = h / drawHeight.pt();
		}
		else
		{
			scale = w / drawWidth.pt();
		}
		painter.scale( scale, scale );

		model::Distance xOffset = ( model::Distance::pt(width/scale) - tmplate.pageWidth() ) / 2;
		model::Distance yOffset = ( model::Distance::pt(height/scale) - tmplate.pageHeight() ) / 2;
		painter.translate( xOffset.pt(), yOffset.pt() );

		drawPaper( painter, tmplate, scale );
		drawLabelOutlines( painter, tmplate, scale );
	}


	void MiniPreviewPixmap::drawPaper( QPainter& painter, const model::Template& tmplate, double scale )
	{
		QBrush brush( paperColor );
		QPen pen( paperOutlineColor );
		pen.setWidth( paperOutlineWidthPixels/scale );

		painter.save();

		painter.setBrush( brush );
		painter.setPen( pen );

		if ( !tmplate.isRoll() )
		{
			painter.drawRect( 0, 0, tmplate.pageWidth().pt(), tmplate.pageHeight().pt() );
		}
		else
		{
			painter.drawPath( RollTemplatePath( tmplate ) );
		}

		painter.restore();
	}


	void MiniPreviewPixmap::drawLabelOutlines( QPainter& painter, const model::Template& tmplate, double scale )
	{
		QBrush brush( labelColor );
		QPen pen( labelOutlineColor );
		pen.setWidth( labelOutlineWidthPixels/scale );

		painter.save();

		painter.setBrush( brush );
		painter.setPen( pen );

		auto frame = tmplate.frame();
		for ( model::Point p0 : frame->getOrigins() )
		{
			drawLabelOutline( painter, frame, p0 );
		}

		painter.restore();
	}


	void MiniPreviewPixmap::drawLabelOutline( QPainter& painter, const model::Frame* frame, const model::Point& p0 )
	{
		painter.save();

		painter.translate( p0.x().pt(), p0.y().pt() );
		painter.drawPath( frame->path() );
		
		painter.restore();
	}

} // namespace glabels