/***************************************************************************
 *   Copyright (c) 2013 Luke Parry <l.parry@warwick.ac.uk>                 *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/

#ifndef DRAWINGGUI_QGRAPHICSITEMVIEWDIMENSION_H
#define DRAWINGGUI_QGRAPHICSITEMVIEWDIMENSION_H

#include <QObject>
#include <QGraphicsView>
#include <QStyleOptionGraphicsItem>
#include <QGraphicsItem>
#include <QGraphicsObject>
#include <QColor>
#include <QFont>
#include <Base/Vector3D.h>
#include "QGIView.h"
#include "QGCustomText.h"

namespace TechDraw {
class DrawViewDimension;
}

namespace TechDraw {
class BaseGeom;
class AOC;
}

namespace TechDrawGui
{
class QGIArrow;
class QGIDimLines;
class QGIViewDimension;
class ViewProviderDimension;

class QGIDatumLabel : public QGraphicsObject
{
Q_OBJECT

public:
    QGIDatumLabel();
    virtual ~QGIDatumLabel() = default;

    enum {Type = QGraphicsItem::UserType + 107};
    int type() const override { return Type;}

    virtual QRectF boundingRect() const override;
    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
    virtual void paint( QPainter *painter,
                        const QStyleOptionGraphicsItem *option,
                        QWidget *widget = nullptr ) override;
    void setLabelCenter();
    void setPosFromCenter(const double &xCenter, const double &yCenter);
    double X() const { return posX; }
    double Y() const { return posY; }              //minus posY?
    
    void setFont(QFont f);
    QFont getFont(void) { return m_dimText->font(); }
    void setDimString(QString t);
    void setDimString(QString t, qreal maxWidth);
    void setTolString();
    void setPrettySel(void);
    void setPrettyPre(void);
    void setPrettyNormal(void);
    void setColor(QColor c);

    bool verticalSep;
    std::vector<int> seps;

    QGCustomText* getDimText(void) { return m_dimText; }
    void setDimText(QGCustomText* newText) { m_dimText = newText; }
    QGCustomText* getTolText(void) { return m_tolText; }
    void setTolText(QGCustomText* newTol) { m_tolText = newTol; }

    double getTolAdjust(void);
    bool hasHover;


Q_SIGNALS:
    void dragging(bool);
    void hover(bool state);
    void selected(bool state);
    void dragFinished();

protected:
    virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
    virtual void hoverEnterEvent(QGraphicsSceneHoverEvent *event) override;
    virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) override;
//    virtual void mouseReleaseEvent( QGraphicsSceneMouseEvent * event) override;

    QGCustomText* m_dimText;
    QGCustomText* m_tolText;
    int getPrecision(void);
    QColor m_colNormal;
    bool m_ctrl;

    double posX;
    double posY;
    
private:
};

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

class TechDrawGuiExport QGIViewDimension : public QGIView
{
    Q_OBJECT

public:
    enum {Type = QGraphicsItem::UserType + 106};

    explicit QGIViewDimension();
    ~QGIViewDimension() = default;

    void setViewPartFeature(TechDraw::DrawViewDimension *obj);
    int type() const override { return Type;}
    virtual QRectF boundingRect() const override;
    virtual void paint( QPainter * painter,
                        const QStyleOptionGraphicsItem * option,
                        QWidget * widget = 0 ) override;

    virtual void drawBorder() override;
    virtual void updateView(bool update = false) override;
    virtual QColor getNormalColor(void) override;
    QString getLabelText(void);
    void setPrettyPre(void);
    void setPrettySel(void);
    void setPrettyNormal(void);


public Q_SLOTS:
    void datumLabelDragged(bool ctrl);
    void datumLabelDragFinished(void);
    void select(bool state);
    void hover(bool state);
    void updateDim(bool obtuse = false);

protected:

    static const int INNER_SECTOR      = 3;
    static const int OUTER_SECTOR      = 2;
    static const int OPPOSITE_SECTOR   = 1;
    static const int COMPLEMENT_SECTOR = 0;

    int classifyPointToArcPosition(double pointDistance, double pointAngle,
                                   double radius, double startAngle, double endAngle, bool clockwise) const;
    double computeLineAndLabelAngles(Base::Vector3d lineTarget, Base::Vector3d labelCenter,
                                     double lineLabelDistance, double &lineAngle, double &labelAngle) const;
    Base::Vector3d computeLineOriginPoint(Base::Vector3d lineTarget, double projectedLabelDistance,
                                          double lineAngle, double labelWidth, double direction) const;

    void draw() override;
    void drawRadiusAligned(TechDraw::DrawViewDimension *dimension,
                           ViewProviderDimension *viewProvider) const;
    void drawRadiusUniform(TechDraw::DrawViewDimension *dimension,
                           ViewProviderDimension *viewProvider) const;
    
    virtual QVariant itemChange( GraphicsItemChange change,
                                 const QVariant &value ) override;
    virtual void setSvgPens(void);
    virtual void setPens(void);
    Base::Vector3d findIsoDir(Base::Vector3d ortho);
    Base::Vector3d findIsoExt(Base::Vector3d isoDir);
    QString getPrecision(void);
    
    int prefRadiusAligned(void);

protected:
    bool hasHover;
    QGIDatumLabel* datumLabel;                                         //dimension text
    QGIDimLines* dimLines;                                       //dimension lines + extension lines
    QGIArrow* aHead1;
    QGIArrow* aHead2;
    //QGICMark* centerMark
    double m_lineWidth;
    bool m_obtuse;

private:
    static const double TextOffsetFudge;

    double getDefaultTextHorizontalOffset(bool toLeft) const;
    double getDefaultTextVerticalOffset() const;
    double getDefaultReferenceLineOverhang() const;

    static double getStandardLinePlacement(double labelAngle);
    static bool angleWithinSector(double testAngle, double startAngle, double endAngle, bool clockwise);
    static double addAngles(double angle1, double angle2);
};

} // namespace MDIViewPageGui

#endif // DRAWINGGUI_QGRAPHICSITEMVIEWDIMENSION_H