#include <math.h>

#include "linkablemapobj.h"

#include "branchobj.h"

#include "mapeditor.h"

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

// LinkableMapObj

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

LinkableMapObj::LinkableMapObj():MapObj()

{

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

    init ();

}

LinkableMapObj::LinkableMapObj(QGraphicsScene* s) :MapObj(s)

{

//    cout << "Const LinkableMapObj (s)\n";

    init ();

}

LinkableMapObj::LinkableMapObj (LinkableMapObj* lmo) : MapObj (lmo->scene)

{

    copy (lmo);

}

LinkableMapObj::~LinkableMapObj()

{

    delete (bottomline);

	delLink();

}

void LinkableMapObj::delLink()

{

	switch (style)

	{

		case Line:

			delete (l);

			break;

		case Parabel:

			while (!segment.isEmpty()) delete segment.takeFirst();

			break;

		case PolyLine:

			delete (p);

			break;

		case PolyParabel:

			delete (p);

			break;

		default:

			break;

	}		

}

void LinkableMapObj::init ()

{

    depth=-1;	

	mapEditor=NULL;

    childObj=NULL;

    parObj=NULL;

    parObjTmpBuf=NULL;

    parPos=QPointF(0,0);

    childPos=QPointF(0,0);

	link2ParPos=false;

    l=NULL;

    orientation=UndefinedOrientation;

    linkwidth=20;		

	thickness_start=8;

    style=UndefinedStyle;

	linkpos=Bottom;

    arcsegs=13;

// TODO instead of linkcolor pen.color() could be used	all around

	pen.setWidth (1);

	pen.setColor (linkcolor);

	pen.setCapStyle ( Qt::RoundCap );

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

    bottomline->setZValue(Z_LINK);

    bottomline->show();

    // Prepare showing the selection of a MapObj

    selected=false;

	hideLinkUnselected=false;

	topPad=botPad=leftPad=rightPad=0;

	repositionRequest=false;

	// Rel Positions

	relPos=QPointF(0,0);

	useRelPos=false;

	useOrientation=true;

}

void LinkableMapObj::copy (LinkableMapObj* other)

{

    MapObj::copy(other);

	bboxTotal=other->bboxTotal;

    setLinkStyle(other->style);

    setLinkColor (other->linkcolor);

	relPos=other->relPos;

	useOrientation=other->useOrientation;

}

void LinkableMapObj::setChildObj(LinkableMapObj* o)

{

    childObj=o;

}

void LinkableMapObj::setParObj(LinkableMapObj* o)

{

    parObj=o;

	mapEditor=parObj->getMapEditor();

}

void LinkableMapObj::setParObjTmp(LinkableMapObj*,QPointF,int)

{

}

void LinkableMapObj::unsetParObjTmp()

{

}

bool LinkableMapObj::hasParObjTmp()

{

	if (parObjTmpBuf) return true;

	return false;

}

void LinkableMapObj::setUseRelPos (const bool &b)

{

	useRelPos=b;

}

void LinkableMapObj::setRelPos()

{

	if (parObj)

	{	

		relPos.setX (absPos.x() - parObj->getChildPos().x() );

		relPos.setY (absPos.y() - parObj->getChildPos().y() );

		parObj->calcBBoxSize();

	}	

}

void LinkableMapObj::setRelPos(const QPointF &p)

{

	relPos=p;

	if (parObj)

	{		

		parObj->calcBBoxSize();

		requestReposition();

	}

}

QPointF LinkableMapObj::getRelPos()

{

	if (!parObj) return QPointF();

	return relPos;

}

qreal LinkableMapObj::getTopPad()

{

	return topPad;

}

qreal LinkableMapObj::getLeftPad()

{

	return leftPad;

}

qreal LinkableMapObj::getRightPad()

{

	return rightPad;

}

LinkableMapObj::Style LinkableMapObj::getDefLinkStyle ()

{

	if (mapEditor==0) return UndefinedStyle;

	Style ls=mapEditor->getMapLinkStyle();

	switch (ls)

	{

		case Line: 

			return ls;

			break;

		case Parabel:

			return ls;

			break;

		case PolyLine:	

			if (depth>1)

				return Line;

			else	

				return ls;

			break;

		case PolyParabel:	

			if (depth>1)

				return Parabel;

			else	

				return ls;

			break;

		default: 

			break;	

	}	

	return UndefinedStyle;

}

void LinkableMapObj::setLinkStyle(Style newstyle)

{

	//if (newstyle=style) return;

	delLink();

	style=newstyle;

    if (childObj!=NULL && parObj != NULL)

    {

		QGraphicsLineItem *cl;

		switch (style)

		{

			case UndefinedStyle:

				bottomline->hide();

				break;

			case Line: 

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

				l->setZValue(Z_LINK);

				if (visible)

					l->show();

				else

					l->hide();

				break;

			case Parabel:

				for (int i=0;i<arcsegs;i++)

				{

					cl = scene->addLine(QLineF(i*5,0,i*10,100),pen);

					cl->setZValue(Z_LINK);

					if (visible)

						cl->show();

					else

						cl->hide();

					segment.append(cl);

				}

				pa0.resize (arcsegs+1);

				break;

			case PolyLine:	

				p =scene->addPolygon(QPolygonF(),pen,linkcolor);

				p->setZValue(Z_LINK);

				if (visible)

					p->show();

				else

					p->hide();

				pa0.resize (3);

				break;

			case PolyParabel:	

				p = scene->addPolygon(QPolygonF(),pen,linkcolor);

				p->setZValue(Z_LINK);

				if (visible)

					p->show();

				else

					p->hide();

				pa0.resize (arcsegs*2+2);

				pa1.resize (arcsegs+1);

				pa2.resize (arcsegs+1);

				break;

			default: 

				break;	

		}	

	} 

}

LinkableMapObj::Style LinkableMapObj::getLinkStyle()

{

	return style;

}

void LinkableMapObj::setHideLinkUnselected(bool b)

{

	hideLinkUnselected=b;

	setVisibility (visible);

	updateLink();

}

bool LinkableMapObj::getHideLinkUnselected()

{

	return hideLinkUnselected;

}

void LinkableMapObj::setLinkPos(Position lp)

{

	linkpos=lp;

}

LinkableMapObj::Position LinkableMapObj::getLinkPos()

{

	return linkpos;

}

void LinkableMapObj::setLinkColor()

{

	// Overloaded in BranchObj and childs

	// here only set default color

	if (mapEditor)

		setLinkColor (mapEditor->getMapDefLinkColor());

}

void LinkableMapObj::setLinkColor(QColor col)

{

	linkcolor=col;

	pen.setColor(col);

    bottomline->setPen( pen );

	switch (style)

	{

		case Line:

			l->setPen( pen);

			break;	

		case Parabel:	

			for (int i=0; i<segment.size(); ++i)

				segment.at(i)->setPen( pen);

			break;

		case PolyLine:

			p->setBrush( QBrush(col));

			p->setPen( pen);

			break;

		case PolyParabel:	

			p->setBrush( QBrush(col));

			p->setPen( pen);

			break;

		default:

			break;

	} // switch (style)	

}

QColor LinkableMapObj::getLinkColor()

{

	return linkcolor;

}

void LinkableMapObj::setVisibility (bool v)

{

	MapObj::setVisibility (v);

	bool visnow=visible;

	// We can hide the link, while object is not selected

	if (hideLinkUnselected && !selected)

		visnow=false;

	if (visnow) 

	{

		bottomline->show();

		switch (style)

		{

			case Line:

				if (l) l->show();

				break;

			case Parabel:	

				for (int i=0; i<segment.size(); ++i)

					segment.at(i)->show();

				break;	

			case PolyLine:

				if (p) p->show();

				break;

			case PolyParabel:	

				if (p) p->show();

				break;

			default:

				break;

		}

	} else 

	{

		bottomline->hide();

		switch (style)

		{

			case Line:

				if (l) l->hide();

				break;

			case Parabel:	

				for (int i=0; i<segment.size(); ++i)

					segment.at(i)->hide();

				break;	

			case PolyLine:

				if (p) p->hide();

				break;

			case PolyParabel:	

				if (p) p->hide();

				break;

			default:

				break;

		}

	}	

}

void LinkableMapObj::setOrientation()

{

	Orientation orientOld=orientation;

	if (!parObj) 

	{

		orientation=UndefinedOrientation;

		return;

	}

    // Set orientation, first look for orientation of parent

    if (parObj->getOrientation() != UndefinedOrientation ) 

		// use the orientation of the parent:

		orientation=parObj->getOrientation();

    else

    {

		// calc orientation depending on position rel to parent

		if (absPos.x() < QPointF(parObj->getChildPos() ).x() )

			orientation=LeftOfCenter; 

		else

			orientation=RightOfCenter;

    }

	if (orientOld!=orientation) requestReposition();

}

void LinkableMapObj::updateLink()

{

    // needs:

    //	childPos of parent

    //	orient   of parent

    //	style

    // 

    // sets:

    //	orientation

    //	childPos	(by calling setDockPos())

    //	parPos		(by calling setDockPos())

	//  bottomlineY

    //	drawing of the link itself

	// updateLink is called from move, but called from constructor we don't

	// have parents yet...

	if (style==UndefinedStyle) return;	

	switch (linkpos)

	{

		case Middle:

			bottomlineY=bbox.top() + bbox.height()/2;	// draw link to middle (of frame)

			break;

		case Bottom:

			bottomlineY=bbox.bottom()-1;	// draw link to bottom of box

			break;

	}

    double p2x,p2y;								// Set P2 Before setting

	if (!link2ParPos)

	{

		p2x=QPointF( parObj->getChildPos() ).x();	// P1, we have to look at

		p2y=QPointF( parObj->getChildPos() ).y();	// orientation

	} else	

	{

		p2x=QPointF( parObj->getParPos() ).x();	

		p2y=QPointF( parObj->getParPos() ).y();

	} 

	setDockPos(); // Call overloaded method

	setOrientation();

	double p1x=parPos.x();	// Link is drawn from P1 to P2

	double p1y=parPos.y();

	double vx=p2x - p1x;	// V=P2-P1

	double vy=p2y - p1y;

	// Draw the horizontal line below heading (from ChildPos to ParPos)

	//bottomline->prepareGeometryChange();

	bottomline->setLine (QLine (qRound(childPos.x()),

		qRound(childPos.y()),

		qRound(p1x),

		qRound(p1y) ));

	double a;	// angle

	if (vx > -0.000001 && vx < 0.000001)

		a=M_PI_2;

	else

		a=atan( vy / vx );

	// "turning point" for drawing polygonal links

	QPointF tp (-qRound(sin (a)*thickness_start), qRound(cos (a)*thickness_start));	

    // Draw the link

	switch (style)

	{

		case Line:

			//l->prepareGeometryChange();

			l->setLine( QLine(qRound (parPos.x()),

				qRound(parPos.y()),

				qRound(p2x),

				qRound(p2y) ));

			break;	

		case Parabel:	

			parabel (pa0, p1x,p1y,p2x,p2y);

			for (int i=0; i<segment.size(); ++i)

			{

				//segment.at(i)->prepareGeometryChange();

				segment.at(i)->setLine(QLineF( pa0.at(i).x(), pa0.at(i).y(),pa0.at(i+1).x(),pa0.at(i+1).y()));

			}	

			break;

		case PolyLine:

			pa0.clear();

			pa0<<QPointF (qRound(p2x+tp.x()), qRound(p2y+tp.y()));

			pa0<<QPointF (qRound(p2x-tp.x()), qRound(p2y-tp.y()));

			pa0<<QPointF (qRound (parPos.x()), qRound(parPos.y()) );

			//p->prepareGeometryChange();

			p->setPolygon(QPolygonF (pa0));

			break;

		case PolyParabel:	

			parabel (pa1, p1x,p1y,p2x+tp.x(),p2y+tp.y());

			parabel (pa2, p1x,p1y,p2x-tp.x(),p2y-tp.y());

			pa0.clear();

			for (int i=0;i<=arcsegs;i++)

				pa0 << QPointF (pa1.at(i));

			for (int i=0;i<=arcsegs;i++)

				pa0 << QPointF (pa2.at(arcsegs-i));

			//p->prepareGeometryChange();

			p->setPolygon(QPolygonF (pa0));

			break;

		default:

			break;

	} // switch (style)	

}

LinkableMapObj* LinkableMapObj::getChildObj()

{

    return childObj;

}

LinkableMapObj* LinkableMapObj::getParObj()

{

    return parObj;

}

LinkableMapObj* LinkableMapObj::findObjBySelect (QString s)

{

	LinkableMapObj *lmo=this;

	QString part;

	QString typ;

	QString num;

	while (!s.isEmpty() )

	{

		part=s.section(",",0,0);

		typ=part.left (3);

		num=part.right(part.length() - 3);

		if (typ=="mc:")

		{

			if (depth>0)

				return false;	// in a subtree there is no center

			else

				break;

		} else

			if (typ=="bo:")

				lmo=((BranchObj*)(lmo))->getBranchNum (num.toInt());

			else

				if (typ=="fi:")

					lmo=((BranchObj*)(lmo))->getFloatImageNum (num.toUInt());

		if (!lmo) break;

		if (s.contains(","))

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

		else	

			break;

	}

	return lmo;

}

QPointF LinkableMapObj::getChildPos()

{

    return childPos;

}

QPointF LinkableMapObj::getParPos()

{

    return parPos;

}

void LinkableMapObj::setUseOrientation (const bool &b)

{	

	if (useOrientation!=b)

	{

		useOrientation=b;

		requestReposition();

	}	

}

LinkableMapObj::Orientation LinkableMapObj::getOrientation()

{

    return orientation;

}

int LinkableMapObj::getDepth()

{

    return depth;

}

void LinkableMapObj::setMapEditor (MapEditor *me)

{

	mapEditor=me;

}

MapEditor* LinkableMapObj::getMapEditor ()

{

	return mapEditor;

}

QPointF LinkableMapObj::getRandPos()

{

	// Choose a random position with given distance to parent:

	double a=rand()%360 * 2 * M_PI / 360;

    return QPointF ( (int)( + 150*cos (a)),

                    (int)( + 150*sin (a)));

}

void LinkableMapObj::reposition()

{

}

void LinkableMapObj::requestReposition()

{

	if (!repositionRequest)

	{

		// Pass on the request to parental objects, if this hasn't

		// been done yet

		repositionRequest=true;

		if (parObj) parObj->requestReposition();

	}

}

void LinkableMapObj::forceReposition()

{

	// Sometimes a reposition has to be done immediatly: For example

	// if the note editor flag changes, there is no user event in mapeditor

	// which could collect requests for a reposition.

	// Then we have to call forceReposition()

	// But no rule without exception: While loading a map or undoing it,

	// we want to block expensive repositioning, but just do it once at

	// the end, thus check first:

	if (mapEditor->isRepositionBlocked()) return;

	// Pass on the request to parental objects, if this hasn't been done yet

	if (parObj) 

		parObj->forceReposition(); 

	else 

		reposition(); 

}

bool LinkableMapObj::repositionRequested()

{

	return repositionRequest;

}

void LinkableMapObj::select()

{

	// select and unselect are still needed to

	// handle hiding of links

    selected=true;

	setVisibility (visible);

}

void LinkableMapObj::unselect()

{

    selected=false;

	// Maybe we have to hide the link:

	setVisibility (visible);

}

void LinkableMapObj::parabel (QPolygonF &ya, double p1x, double p1y, double p2x, double p2y)

{

	double vx=p2x - p1x;	// V=P2-P1

	double vy=p2y - p1y;

	double dx;				// delta x during calculation of parabel

	double pnx;				// next point

	double pny;

	double m;

	if (vx > -0.0001 && vx < 0.0001)

		m=0;

	else	

		m=(vy / (vx*vx));

	dx=vx/(arcsegs);

	ya.clear();

	ya<<QPointF (qRound(p1x),qRound(p1y));

	for (int i=1;i<=arcsegs;i++)

	{	

		pnx=p1x+dx;

		pny=m*(pnx-parPos.x())*(pnx-parPos.x())+parPos.y();

		ya<<QPointF (qRound(pnx),qRound(pny));

		p1x=pnx;

		p1y=pny;

	}	

}

QString LinkableMapObj::getLinkAttr ()

{

	if (hideLinkUnselected)

		return attribut ("hideLink","true");

	else

		return attribut ("hideLink","false");

}