//=============================================================================================================


//*************************************************************************************************************
//=============================================================================================================
// INCLUDES
//=============================================================================================================

#include "arrow.h"

#include <math.h>

#include <QPen>
#include <QPainter>


//*************************************************************************************************************
//=============================================================================================================
// CONSTS
//=============================================================================================================

const qreal Pi = 3.14;


//*************************************************************************************************************
//=============================================================================================================
// USED NAMESPACES
//=============================================================================================================

using namespace MNESCAN;


//*************************************************************************************************************
//=============================================================================================================
// DEFINE MEMBER METHODS
//=============================================================================================================

Arrow::Arrow(PluginItem *startItem, PluginItem *endItem, SCSHAREDLIB::PluginConnectorConnection::SPtr &connection, QGraphicsItem *parent)
: QGraphicsLineItem(parent)
, m_StartItem(startItem)
, m_EndItem(endItem)
, m_pConnection(connection)
{
    m_StartItem = startItem;
    m_EndItem = endItem;
    setFlag(QGraphicsItem::ItemIsSelectable, true);
    m_qColor = Qt::black;
    setPen(QPen(m_qColor, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
}


//*************************************************************************************************************

QRectF Arrow::boundingRect() const
{
    qreal extra = (pen().width() + 20) / 2.0;

    return QRectF(line().p1(), QSizeF(line().p2().x() - line().p1().x(),
                                      line().p2().y() - line().p1().y()))
        .normalized()
        .adjusted(-extra, -extra, extra, extra);
}


//*************************************************************************************************************

QPainterPath Arrow::shape() const
{
    QPainterPath path = QGraphicsLineItem::shape();
    path.addPolygon(arrowHead);
    return path;
}


//*************************************************************************************************************

void Arrow::updatePosition()
{
    QLineF line(mapFromItem(m_StartItem, 0, 0), mapFromItem(m_EndItem, 0, 0));
    setLine(line);
}


//*************************************************************************************************************

void Arrow::paint(QPainter *painter, const QStyleOptionGraphicsItem *,
          QWidget *)
{
    if (m_StartItem->collidesWithItem(m_EndItem))
        return;

    QPen myPen = pen();
    myPen.setColor(m_qColor);
    qreal arrowSize = 10;
    painter->setPen(myPen);
    painter->setBrush(m_qColor);

    painter->setRenderHint(QPainter::Antialiasing);


    QLineF centerLine(m_StartItem->pos(), m_EndItem->pos());
    QPolygonF endPolygon = m_EndItem->polygon();
    QPointF p1 = endPolygon.first() + m_EndItem->pos();
    QPointF p2;
    QPointF intersectPoint;
    QLineF polyLine;
    for (int i = 1; i < endPolygon.count(); ++i) {
    p2 = endPolygon.at(i) + m_EndItem->pos();
    polyLine = QLineF(p1, p2);
    QLineF::IntersectType intersectType =
        polyLine.intersect(centerLine, &intersectPoint);
    if (intersectType == QLineF::BoundedIntersection)
        break;
        p1 = p2;
    }

    setLine(QLineF(intersectPoint, m_StartItem->pos()));

    double angle = ::acos(line().dx() / line().length());
    if (line().dy() >= 0)
        angle = (Pi * 2) - angle;

        QPointF arrowP1 = line().p1() + QPointF(sin(angle + Pi * 2 / 5) * arrowSize,
                                        cos(angle + Pi * 2 / 5) * arrowSize);
        QPointF arrowP2 = line().p1() + QPointF(sin(angle + Pi - Pi * 2 / 5) * arrowSize,
                                        cos(angle + Pi - Pi * 2 / 5) * arrowSize);

        arrowHead.clear();
        arrowHead << line().p1() << arrowP1 << arrowP2;
        painter->drawLine(line());
        painter->drawPolygon(arrowHead);
        if (isSelected()) {
            painter->setPen(QPen(m_qColor, 1, Qt::DashLine));
        QLineF qLine = line();
        qLine.translate(0, 4.0);
        painter->drawLine(qLine);
        qLine.translate(0,-8.0);
        painter->drawLine(qLine);
    }
}
