#include <QDebug>

#include "xlinkobj.h"

#include "branchobj.h"

#include "branchitem.h"

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

// XLinkObj

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

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

XLinkObj::XLinkObj (QGraphicsScene* scene,Link *l):MapObj(scene)

{

	//qDebug()<< "Const XLinkObj (s,Link)";

	link=l;

	init();

}

XLinkObj::~XLinkObj ()

{

	//qDebug() << "Destr XLinkObj";

	delete (line);

	delete (poly);

}

void XLinkObj::init () 

{

	visBranch=NULL;

	pen.setColor ( link->getColor() );

	pen.setWidth ( link->getWidth() );

	pen.setCapStyle (  Qt::RoundCap );

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

	line->setZValue (Z_LINK);

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

	poly->setZValue (Z_LINK);

	setVisibility (true);

}

void XLinkObj::setEnd (QPointF p)

{

	endPos=p;

}

void XLinkObj::updateXLink()

{

	QPointF a,b;

	QPolygonF pa;

	if (visBranch)   

	{

		// Only one of the linked branches is visible

		BranchObj *bo=(BranchObj*)(visBranch->getLMO());

		if (!bo) return;

		a=b=bo->getChildPos();

		if (bo->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

		BranchItem *bi=link->getBeginBranch();

		if ( bi)

		{

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

			// we have already a beginBranch

			BranchObj *bo=(BranchObj*)(bi->getLMO());

			if (bo)	

				a=bo->getChildPos();

			else 

				return;	

		}	

		else

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

			a=beginPos;

		bi=link->getEndBranch();

		if (bi)

		{

			BranchObj *bo=(BranchObj*)(bi->getLMO());

			if (bo)	

				b=bo->getChildPos();

			else 

				return;	

		}

		else

			b=endPos;

	}

	beginPos=a;

	endPos=b;

	pen.setColor ( link->getColor() );

	pen.setWidth ( link->getWidth() );

	poly->setBrush (link->getColor() );

	line->setPen (pen);

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

}

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 ()

{

	BranchItem* beginBI=link->getBeginBranch();

	BranchObj* beginBO=NULL;

	if (beginBI) beginBO=(BranchObj*)(beginBI->getLMO());

	BranchObj* endBO=NULL;

	BranchItem* endBI=link->getEndBranch();

	if (endBI) endBO=(BranchObj*)(endBI->getLMO());

	if (beginBO && endBO)

	{

		if(beginBO->isVisibleObj() && endBO->isVisibleObj())

		{	// Both ends are visible

			visBranch=NULL;

			setVisibility (true);

		} else

		{

			if(!beginBO->isVisibleObj() && !endBO->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 (beginBO->isVisibleObj())

					visBranch=beginBI;

				else

					visBranch=endBI;

				setVisibility (true);

			}

		}

	}

}