/***************************************************************************
 *   Copyright (C) 2005 by Carsten Niehaus                                 *
 *   cniehaus@kde.org                                                      *
 *   
 *                                                                         *
 *   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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ***************************************************************************/
#include "spectrumwidget.h"
#include "spectrum.h"
#include "element.h"
#include "kalziumutils.h"

#include <kdebug.h>
#include <kglobal.h>
#include <klocale.h>
#include <math.h>

#include <tqcursor.h>
#include <tqsizepolicy.h>
#include <tqpainter.h>
#include <tqpixmap.h>
#include <tqtooltip.h>

#include <tqglobal.h>
#if defined(Q_OS_SOLARIS)
#include <ieeefp.h>
#endif

SpectrumWidget::SpectrumWidget( TQWidget *parent, const char* name ) : TQWidget( parent, name )
{
	startValue = 0;
	endValue = 0;

	m_LMBPointCurrent.setX( -1 );
	m_LMBPointPress.setX( -1 );

	m_showtooltip = false;

	m_realHeight = 200;

	Gamma = 0.8;
	IntensityMax = 255;

	setType( EmissionSpectrum );

	setMinimumSize( 400, 230 );
	setSizePolicy( TQSizePolicy::Expanding, TQSizePolicy::Expanding );
	setBackgroundMode( NoBackground );
}

void SpectrumWidget::paintEvent( TQPaintEvent * /*e*/ )
{
	if ( !m_spectrum )
		 return;

	m_pixmap.resize( width(), height() );
	m_pixmap.fill( this, width(), height() );

	TQPainter p;
	p.tqbegin( &m_pixmap, this );
	p.fillRect( 0, 0, width(), m_realHeight, TQt::black ); 

	paintBands( &p );
	
	drawTickmarks( &p );

	if ( m_showtooltip )
		drawTooltip( &p );

	if ( m_LMBPointPress.x() != -1 && m_LMBPointCurrent.x() != -1 )
		drawZoomLine( &p );

	p.end();
	bitBlt( this, 0, 0, &m_pixmap );
}

void SpectrumWidget::drawZoomLine( TQPainter* p )
{
	p->setPen( TQt::white );
	p->drawLine( m_LMBPointPress.x(), m_LMBPointPress.y(), m_LMBPointCurrent.x(), m_LMBPointPress.y() );
	p->drawLine( m_LMBPointCurrent.x(), m_LMBPointPress.y()+10, m_LMBPointCurrent.x(), m_LMBPointPress.y()-10 );
	p->drawLine( m_LMBPointPress.x(), m_LMBPointPress.y()+10, m_LMBPointPress.x(), m_LMBPointPress.y()-10 );

}

void SpectrumWidget::paintBands( TQPainter* p )
{
	if ( m_type == AbsorptionSpectrum )
	{
		for ( double va = startValue; va <= endValue ; va += 0.1 )
		{
			int x = xPos( va );
			p->setPen( linecolor( va ) );
			p->drawLine( x,0,x, m_realHeight );
		}

		p->setPen( TQt::black );
	}

 	int i = 0;
	int x = 0;
	int temp = 0;	

 	for ( TQValueList<Spectrum::band>::Iterator it = m_spectrum->bandlist()->begin();
 			it != m_spectrum->bandlist()->end();
 			++it )
 	{
 		if ( ( *it ).wavelength < startValue || ( *it ).wavelength > endValue )
			continue;
 
 		x = xPos( ( *it ).wavelength );
 	
 		temp = 0;  

 		switch ( m_type )
 		{
			case EmissionSpectrum:
				p->setPen( linecolor( ( *it ).wavelength ) );
				p->drawLine( x,0,x, m_realHeight-1 );

				p->setPen( TQt::black );
//				p->drawLine( x,m_realHeight,x, m_realHeight );
				break;
 		
			case AbsorptionSpectrum:
				p->setPen( TQt::black );
				p->drawLine( x,0,x, m_realHeight-1 );
				break;
 		}
 		
 		i++;
 	}
}

TQColor SpectrumWidget::linecolor( double spectrum )
{
        int r,g,b;
        wavelengthToRGB( spectrum, r,g,b );

        TQColor c( r,g,b );
        return c;
}


void SpectrumWidget::wavelengthToRGB( double wavelength, int& r, int& g, int& b )
{
	double blue = 0.0, green = 0.0, red = 0.0, factor = 0.0;

	int wavelength_ = ( int ) floor( wavelength );
	if ( wavelength_ < 380 || wavelength_ > 780 )
	{
		//make everything white
		r = g = b = 255;
		return;
	}
	else if ( wavelength_ > 380 && wavelength_ < 439 )
	{
		red = -( wavelength-440 ) / ( 440-380 );
		green = 0.0;
		blue = 1.0;
	
	}
	else if ( wavelength_ > 440 && wavelength_ < 489 )
	{
		red = 0.0;
		green = ( wavelength-440 ) / ( 490-440 );
		blue = 1.0;
	}
	else if ( wavelength_ > 490 && wavelength_ < 509 )
	{
		red = 0.0;
		green = 1.0;
		blue = -( wavelength-510 ) / ( 510-490 );
	}
	else if ( wavelength_ > 510 && wavelength_ < 579 )
	{
		red = ( wavelength-510 ) / ( 580-510 );
		green = 1.0;
		blue = 0.0;
	}
	else if ( wavelength_ > 580 && wavelength_ < 644 )
	{
		red = 1.0;
		green = -( wavelength-645 ) / ( 645-580 );
		blue = 0.0;
	}
	else if ( wavelength_ > 645 && wavelength_ < 780 )
	{
		red = 1.0;
		green = 0.0;
		blue = 0.0;
	}

	if ( wavelength_ > 380 && wavelength_ < 419 )
		factor = 0.3 + 0.7*( wavelength - 380 ) / ( 420 - 380 );
	else if ( wavelength_ > 420 && wavelength_ < 700 )
		factor = 1.0;
	else if ( wavelength_ > 701 && wavelength_ < 780 )
		factor = 0.3 + 0.7*( 780 - wavelength ) / ( 780 - 700 );
	else
		factor = 0.0;

	r = Adjust( red, factor );
	g = Adjust( green, factor );
	b = Adjust( blue, factor );
}

int SpectrumWidget::Adjust( double color, double factor )
{
	if ( color == 0.0 )
		return 0;
	else
		return tqRound( IntensityMax * pow( color*factor, Gamma ) );
}

void SpectrumWidget::drawTickmarks( TQPainter* p )
{
	//the size of the text on the tickmarks
	const int space = 20;

	//the distance between the tickmarks in pixel
	const int d = 10;

	//the total number of tickmarks to draw (small and long)
	const int numberOfTickmarks = ( int )floor( width()/d );

	double pos = 0.0;
		
	for ( int i = 0; i < numberOfTickmarks; i++  )
	{
		if( i%5 == 0 )
		{//long tickmarks plus text
			p->drawLine( i*d, m_realHeight, i*d, m_realHeight+10 );	
			if ( i%10 == 0 && 
					i*d > space && 
					i*d < width()-space )
			{
				pos = ( double ) ( i*d )/width();
				p->fillRect( i*d-space, m_realHeight+12, 2*space, 15, TQt::white );
				p->drawText( i*d-space, m_realHeight+12, 2*space, 15, TQt::AlignCenter, KalziumUtils::localizedValue(  KalziumUtils::strippedValue( Wavelength( pos ) ), 6 ) );
			}
		}
		else {//small tickmarks
			p->drawLine( i*d, m_realHeight, i*d, m_realHeight+5 );
		}
	}
}

void SpectrumWidget::keyPressEvent( TQKeyEvent *e )
{
	 kdDebug() << "SpectrumWidget::keyPressEvent()" << endl;
	switch ( e->key() )
	{
		case Key_Plus:
			slotZoomIn();
			break;
		case Key_Minus:
			slotZoomOut();
			break;
	}
}

void SpectrumWidget::slotZoomOut()
{
	kdDebug() << "SpectrumWidget::slotZoomOut() "<< startValue << ":: "<< endValue << endl;

	double diff = endValue - startValue;
	
	double offset = diff * 0.05;

	endValue = endValue + offset;
	startValue = startValue - offset;

	//check for invalid values
	if ( startValue < 0.0 )
		startValue = 0.0;

	if ( endValue > 800.0 )
		endValue = 800.0;

	setBorders( ( int ) startValue, ( int )endValue );
			
	kdDebug() << "SpectrumWidget::slotZoomOut() "<< startValue << ":: "<< endValue << endl;
}

void SpectrumWidget::slotZoomIn()
{
	kdDebug() << "SpectrumWidget::slotZoomIn() "<< startValue << ":: "<< endValue << endl;

	double diff = endValue - startValue;
	
	double offset = diff * 0.05;

	endValue = endValue - offset;
	startValue = startValue + offset;

	setBorders( ( int ) startValue, ( int )endValue );
			
	kdDebug() << "SpectrumWidget::slotZoomIn() "<< startValue << ":: "<< endValue << endl;
}

void SpectrumWidget::mouseMoveEvent( TQMouseEvent *e )
{
	m_LMBPointCurrent = e->pos();
	update();
}

void SpectrumWidget::mousePressEvent(  TQMouseEvent *e )
{
	if (  e->button() == Qt::LeftButton )
		m_LMBPointPress = e->pos();
	if (  e->button() == Qt::RightButton )
		slotZoomOut();
//FIXME
//the tooltip is not really working. Better to not have it
//in KDE 3.4 and think of a better solution.
//PrepareTooltip( Wavelength( ( double )e->pos().x()/width() ) );
}

void SpectrumWidget::PrepareTooltip( double wavelength )
{
	Spectrum::band band;
	
 	TQValueList<Spectrum::band>::const_iterator it = m_spectrum->bandlist()->begin();
	const TQValueList<Spectrum::band>::const_iterator itEnd = m_spectrum->bandlist()->end();

	//find the difference in percent (1.0 is 100%, 0.1 is 10%)
	double dif = 0.0;

	bool foundWavelentgh = false;
	
	//find the highest intensity
	for ( ; it != itEnd; ++it )
	{
		double thisdif = ( *it ).wavelength / wavelength;
	
		if ( thisdif < 0.9 || thisdif > 1.1 )
			continue;
		
		if ( thisdif > 1.0 ){//convert for example 1.3 to 0.7
			thisdif = thisdif-1;
			thisdif = 1-thisdif;
		}

		if ( thisdif > dif )
		{
			dif = thisdif;
			band = *it;
			foundWavelentgh = true;
		}
	}
	if ( foundWavelentgh )
	{
		m_band = band;
		m_showtooltip = true;
	}
	else 
		m_showtooltip = false;
	
	kdDebug() << "SpectrumWidget::PrepareTooltip(): "<< m_showtooltip << endl;
	update();
}

void SpectrumWidget::drawTooltip( TQPainter *p )
{
	p->setPen( TQt::white );
	TQPoint pt = mapFromGlobal( TQCursor::pos() );
	p->drawText( pt, i18n("Wavelength: %1").tqarg(m_band.wavelength) ); 
	pt.setY( pt.y() + 15 );
	p->drawText( pt, i18n("Intensity: %1").tqarg(m_band.intensity) ); 
	pt.setY( pt.y() + 15 );
	p->drawText( pt, i18n("Energy 1, Energy 2: %1, %2").tqarg(m_band.energy1).tqarg( m_band.energy2 ));
	pt.setY( pt.y() + 15 );
	p->drawText( pt, i18n("Term 1, Term 2: %1, %2").tqarg(m_band.term1).tqarg( m_band.term2 ));
	pt.setY( pt.y() + 15 );
	p->drawText( pt, i18n("J 1, J 2: %1, %2").tqarg(m_band.J1).tqarg( m_band.J2 ));
}

void SpectrumWidget::mouseReleaseEvent(  TQMouseEvent *e )
{
	if (  e->button() == Qt::LeftButton )
	{
		int left = (int)Wavelength( ( double )m_LMBPointPress.x()/width() );
		int right = (int)Wavelength( ( double )e->pos().x()/width() );

		if ( left == right )
			return;

		if ( left > right )
			setBorders( right, left );
		else
			setBorders( left, right );
	}

	m_LMBPointPress.setX( -1 );
	m_LMBPointCurrent.setX( -1 );
}

TQPixmap SpectrumWidget::pixmap()
{
	TQPixmap tmp( m_pixmap );
	TQString text;

	if( m_type == EmissionSpectrum )
		text = i18n( "Emission spectrum of %1" ).tqarg( m_spectrum->parentElement()->elname() );
	else
		text = i18n( "Absorption spectrum of %1" ).tqarg( m_spectrum->parentElement()->elname() );

	TQPainter p( &tmp );
	p.setPen( TQt::black );
	p.drawText( 30, m_realHeight + 70, text );

	return tmp;
}

#include "spectrumwidget.moc"