#pragma once

#ifndef __APPLE__
  #include <QGestureRecognizer>
  #include <QGesture>
  #include <QEvent>

namespace Gestures {

enum GestureResult {
  NOT_HANLDED,
  SWIPE_LEFT,
  SWIPE_RIGHT,
  SWIPE_UP,
  SWIPE_DOWN,
  ZOOM_IN,
  ZOOM_OUT
};

extern Qt::GestureType GDPinchGestureType;
extern Qt::GestureType GDSwipeGestureType;

void registerRecognizers();

void unregisterRecognizers();

bool isFewTouchPointsPresented();

class GDPinchGestureRecognizer;
class GDPinchGesture: public QGesture
{
public:
  GDPinchGesture( QObject * parent );

  bool isScaleChanged() const
  {
    return scaleChanged;
  }
  const QPointF & getCenterPoint() const
  {
    return centerPoint;
  }
  qreal getTotalScaleFactor() const
  {
    return totalScaleFactor;
  }

protected:
  QPointF startCenterPoint;
  QPointF lastCenterPoint;
  QPointF centerPoint;

  qreal lastScaleFactor;
  qreal scaleFactor;
  qreal totalScaleFactor;

  bool isNewSequence;
  QPointF startPosition[ 2 ];
  bool scaleChanged;

  friend class GDPinchGestureRecognizer;
};

class GDSwipeGestureRecognizer;
class GDSwipeGesture: public QGesture
{
public:
  GDSwipeGesture( QObject * parent );
  QSwipeGesture::SwipeDirection getHorizDirection() const
  {
    return horizDirection;
  }
  QSwipeGesture::SwipeDirection getVertDirection() const
  {
    return vertDirection;
  }

protected:
  QSwipeGesture::SwipeDirection vertDirection;
  QSwipeGesture::SwipeDirection horizDirection;
  QPoint lastPositions[ 2 ];
  bool started;

  friend class GDSwipeGestureRecognizer;
};

class GDPinchGestureRecognizer: public QGestureRecognizer
{
public:
  static const qreal OUT_SCALE_LIMIT;
  static const qreal IN_SCALE_LIMIT;

  GDPinchGestureRecognizer() {}

private:

  virtual QGesture * create( QObject * pTarget );
  virtual QGestureRecognizer::Result recognize( QGesture * pGesture, QObject * pWatched, QEvent * pEvent );
  void reset( QGesture * pGesture );
};

class GDSwipeGestureRecognizer: public QGestureRecognizer
{
public:
  GDSwipeGestureRecognizer() {}

private:
  static const int MOVE_X_TRESHOLD = 100;
  static const int MOVE_Y_TRESHOLD = 50;

  virtual QGesture * create( QObject * pTarget );
  virtual QGestureRecognizer::Result recognize( QGesture * pGesture, QObject * pWatched, QEvent * pEvent );
  void reset( QGesture * pGesture );
  qreal computeAngle( int dx, int dy );
};

bool handleGestureEvent( QObject * obj, QEvent * event, GestureResult & result, QPoint & point );

} // namespace Gestures


#endif
