#include "xlinkobj.h"

#include "branchobj.h"

/////////////////////////////////////////////////////////////////

// XLinkObj

/////////////////////////////////////////////////////////////////

int XLinkObj::arrowSize=10;						// make instances 

XLinkObj::XLinkObj ():MapObj() 

{

	//	cout << "Const XLinkObj ()\n";

	init();

}

XLinkObj::XLinkObj (QGraphicsScene* s):MapObj(s)

{

	//	cout << "Const XLinkObj (s)  called from MapCenterObj (s)\n";

	init();

}

XLinkObj::~XLinkObj ()

{

//	cout << "Destr XLinkObj\n";

	if (xLinkState!=undefinedXLink)

		deactivate();

	delete (line);

	delete (poly);

}

void XLinkObj::init () 

{

	beginBranch=NULL;

	endBranch=NULL;

	visBranch=NULL;

	xLinkState=undefinedXLink;

	color=QColor (180,180,180);

	width=1;

	pen.setColor (color);

	pen.setWidth (width);

	pen.setCapStyle (  Qt::RoundCap );

	line=scene->addLine(QLineF(1,1,1,1),pen);

    line->setZValue (Z_XLINK);

	poly=scene->addPolygon(QPolygonF(),pen,color);

    poly->setZValue (Z_XLINK);

	setVisibility (false);

}

void XLinkObj::copy (XLinkObj* other)

{

	// TODO copy not used yet

	MapObj::copy (other);

	setVisibility (other->visible);

	beginBranch=other->beginBranch;

	endBranch=other->endBranch;

	width=other->width;

}

void XLinkObj::setBegin (BranchObj *bo)

{

	if (bo) 

	{

		xLinkState=initXLink;

		beginBranch=bo;

		beginPos=beginBranch->getChildPos();

	}	

}

BranchObj* XLinkObj::getBegin ()

{

	return beginBranch;

}

void XLinkObj::setEnd (BranchObj *bo)

{

	if (bo) 

	{

		xLinkState=initXLink;

		endBranch=bo;

		endPos=endBranch->getChildPos();

	}		

}

BranchObj* XLinkObj::getEnd()

{

	return endBranch;

}

void XLinkObj::setWidth (int w)

{

	width=w;

	pen.setWidth (w);

	setColor (color);

}

int XLinkObj::getWidth()

{

	return pen.width();

}

void XLinkObj::setColor(QColor c)

{

	color=c;

	pen.setColor (c);

	line->setPen (pen);

	poly->setBrush( color );

}

QColor XLinkObj::getColor()

{

	return pen.color();

}

void XLinkObj::setEnd (QPointF p)

{

	endPos=p;

}

bool XLinkObj::activate ()

{

	if (beginBranch && endBranch)

	{

		if (beginBranch==endBranch) return false;

		xLinkState=activeXLink;

		beginBranch->addXLink (this);

		endBranch->addXLink (this);

		setVisibility ();

		return true;

	} else

		return false;

}

void XLinkObj::deactivate ()

{

	if (beginBranch)

		beginBranch->removeXLinkRef (this);

	beginBranch=NULL;	

	if (endBranch)

		endBranch->removeXLinkRef (this);

	endBranch=NULL;	

	visBranch=NULL;

	xLinkState=undefinedXLink;

	line->hide();

}

bool XLinkObj::isUsed()

{

	if (beginBranch || endBranch || xLinkState!=undefinedXLink)

		return true;

	else

		return false;

}

void XLinkObj::updateXLink()

{

	QPointF a,b;

	QPolygonF pa;

	if (visBranch)

	{

		// Only one of the linked branches is visible

		a=b=visBranch->getChildPos();

		if (visBranch->getOrientation()==LinkableMapObj::RightOfCenter)

		{

			b.setX (b.x()+25);

			pa.clear();

			pa<< QPointF(b.x(),b.y())<<

				QPointF(b.x()-arrowSize,b.y()-arrowSize)<<

				QPointF(b.x()-arrowSize,b.y()+arrowSize);

			poly->setPolygon(pa);

		} else

		{

			b.setX (b.x()-25);

			pa.clear();

			pa<< QPointF(b.x(),b.y())<<

				QPointF(b.x()+arrowSize,b.y()-arrowSize)<<

				QPointF(b.x()+arrowSize,b.y()+arrowSize);

			poly->setPolygon (pa);

		}	

	} else

	{

		// Both linked branches are visible

		if (beginBranch)

			// If a link is just drawn in the editor,

			// we have already a beginBranch

			a=beginBranch->getChildPos();

		else

			// This shouldn't be reached normally...

			a=beginPos;

		if (xLinkState==activeXLink && endBranch)

			b=endBranch->getChildPos();

		else

			b=endPos;

	}

	if (line->line().p1()==a && line->line().p2()==b && !visBranch)

	{

		// update is called from both branches, so only

		// update if something has changed

		return;

	}	

	else

	{

		beginPos=a;

		endPos=b;

		line->setPen (pen);

		line->setLine(a.x(), a.y(), b.x(), b.y());

	}

}

BranchObj* XLinkObj::otherBranch(BranchObj* thisBranch)

{

	if (!beginBranch && !endBranch)

		return NULL;

	if (thisBranch==beginBranch)

		return endBranch;

	else	

		return beginBranch;

}

void XLinkObj::positionBBox()

{

}

void XLinkObj::calcBBoxSize()

{

}

void XLinkObj::setVisibility (bool b)

{

	MapObj::setVisibility (b);

	if (b)

	{

		line->show();

		if (visBranch) 

			poly->show();

		else	

			poly->hide();

	}	

	else

	{

		line->hide();

		poly->hide();

	}	

}

void XLinkObj::setVisibility ()

{

	if (beginBranch && endBranch)

	{

		if(beginBranch->isVisibleObj() && endBranch->isVisibleObj())

		{	// Both ends are visible

			visBranch=NULL;

			setVisibility (true);

		} else

		{

			if(!beginBranch->isVisibleObj() && !endBranch->isVisibleObj())

			{	//None of the ends is visible

				visBranch=NULL;

				setVisibility (false);

			} else

			{	// Just one end is visible, draw a symbol that shows

				// that there is a link to a scrolled branch

				if (beginBranch->isVisibleObj())

					visBranch=beginBranch;

				else

					visBranch=endBranch;

				setVisibility (true);

			}

		}

	}

}

QString XLinkObj::saveToDir ()

{

	QString s="";

	if (beginBranch && endBranch &&xLinkState==activeXLink)

	{

		if (beginBranch==endBranch && xLinkState)

			s="";

		else

		{

			QString colAttr=attribut ("color",color.name());

			QString widAttr=attribut ("width",QString().setNum(width,10));

			QString begSelAttr=attribut ("beginID",beginBranch->getSelectString());

			QString endSelAttr=attribut ("endID",  endBranch->getSelectString());

			s=beginElement ("xlink", colAttr +widAttr +begSelAttr +endSelAttr);

			s+=endElement ("xlink");

		}

	}

	return s;

}