#include <math.h>

#include <qregexp.h>

#include <qpoint.h>

#include "misc.h"

QString qpointToString (const QPoint &p)

{

	return "(" + QString("%1").arg(p.x()) +","+ QString ("%1").arg (p.y()) +")";

}

ostream &operator<< (ostream &stream, QPoint const &p)

{ 

    return (stream << qpointToString(p) );

}

float getAngle(const QPoint &p)

{	

	// Calculate angle of vector to y-axis

	if (p.y()==0)

	{

		if (p.x()>=0)

			return M_PI_2;

		else

			return 3* M_PI_2;

	} else

	{

		if (p.y()>0) 

			return (float)(M_PI  - atan ( (double)(p.x()) / (double)(p.y()) ) );

		else	

			if (p.x()<0)

				return (float)( 2*M_PI - atan ( (double)(p.x()) / (double)(p.y()) ) );

			else	

				return (float)( - atan ( (double)(p.x()) / (double)(p.y()) ) );

	}	

}

QPoint normalise(const QPoint &p)

{	

	// Calculate normalised position (fixed length) 

	double px=p.x();

	double py=p.y();

	double x;

	double y;

	double r=150;

	if (px==0)

	{

		x=0;

		if (py>=0)

			y=r;

		else

			y=-r;

	} else

	{

		double sign;

		double a;

		if (px>0) 

			sign=1; 

		else 

			sign=-1;

		a=atan (py / px);

		x=cos (a) * r *sign;

		y=sin (a) * r *sign;

	}	

	return QPoint ((int) (x),(int) (y));

}

QString maskPath(QString p)

{

	// Change " " to "\ " to enable blanks in filenames

	p=p.replace(QChar('&'),"\\&");

	return p.replace(QChar(' '),"\\ ");

}

QString convertToRel (const QString &src, const QString &dst)

{

	QString s=src;

	QString d=dst;

	int i;

	// Find relative path from src to dst

	// Remove the first "/"

	if (s.section ("/",0,0).isEmpty()) 

	{

		s=s.right (s.length()-1);

		d=d.right (d.length()-1);

	}

	// remove identical left parts

	while (s.section("/",0,0) == d.section("/",0,0) ) 

	{

		i=s.find ("/");

		s=s.right (s.length()-i-1);

		d=d.right (d.length()-i-1);

	}

	int srcsep=s.contains("/");

	int dstsep=d.contains("/");

	if (srcsep >=  dstsep )

	{

		// find path to go up first and then back to dst

		i=1;

		while (i<=srcsep) 

		{

			d="../"+d;

			i++;

		}	

	}

	return d;

}

// returns masked "<" ">" "&"

QString quotemeta(const QString &s)

{

	QString r=s;

    QRegExp  rx("&(?!amp;)");

    r.replace ( rx,"&");

    rx.setPattern( ">");

    r.replace ( rx,">");

    rx.setPattern( "<");

    r.replace ( rx,"<");

    rx.setPattern( "\"");

    r.replace ( rx,""");

    return r;

}

int max(int a, int b)

{

	if (a>b)

		return a;

	return b;

}

int xmlObj::actindent=0;		// make instance of actindent

xmlObj::xmlObj()

{

    indentwidth=4;

}

// returns <s at />

QString xmlObj::singleElement(QString s, QString at)

{

    return indent() + "<" + s +" " + at +" " + "/>\n";

}

// returns <s>

QString xmlObj::beginElement(QString s)

{

    return indent() + "<" + s + ">\n";

}

// returns <s at>

QString xmlObj::beginElement(QString s, QString at)

{

    return indent() + "<" + s + " " + at + ">\n";

}

// returns </s>

QString xmlObj::endElement(QString s)

{

    return indent() + "</" + s + ">\n";

}

// returns  at="val"

QString xmlObj::attribut(QString at, QString val)

{

    return " " + at + "=\"" + quotemeta (val) + "\""; 

}

// returns <s> val </s>

QString xmlObj::valueElement(QString el, QString val)

{

    return indent() + "<" + el + ">" + quotemeta(val) + "</" +el + ">\n";

}

// returns <s at> val </s>

QString xmlObj::valueElement(QString el, QString val, QString at)

{

    return indent() + "<" + el + " " + at + ">" + quotemeta(val) + "</" +el + ">\n";

}

void xmlObj::incIndent()

{

    actindent++;

}	

void xmlObj::decIndent()

{

    actindent--;

    if (actindent<0) actindent=0;

}	

QString xmlObj::indent()

{

    QString s;

    int i;

    for (i=0; i<actindent*indentwidth; i++)

    {

		s= s + " ";

    }

    return s;

}	

ImagePreview::ImagePreview (QWidget *parent=0): QLabel (parent)

{

}

void ImagePreview::previewUrl( const QUrl &u )

{

    QString path = u.path();

    QPixmap pix( path );

    if ( pix.isNull() )

        setText( QObject::tr("This is not an image.") );

    else

	{

		float max_w=300;

		float max_h=300;

		float r;

		if (pix.width()>max_w)

		{

			r=max_w / pix.width();

			pix.resize(qRound(pix.width()*r), qRound(pix.height()*r));

			// TODO not a resize, but a shrink/enlarge is needed here...

		}

		if (pix.height()>max_h)

		{

			r=max_h / pix.height();

			pix.resize(qRound(pix.width()*r), qRound(pix.height()*r));

			// TODO not a resize, but a shrink/enlarge is needed here...

		}

        setPixmap( pix );

	}	

}