#pragma once

#include <QtCore/QUuid>

#include <QtWidgets/QGraphicsObject>

#include "PortType.hpp"
#include "NodeData.hpp"
#include "NodeIndex.hpp"
#include "ConnectionGeometry.hpp"
#include "ConnectionState.hpp"

class QGraphicsSceneMouseEvent;

namespace QtNodes
{

class FlowScene;
struct ConnectionID;

/// Graphic Object for connection.
class ConnectionGraphicsObject
  : public QGraphicsObject
{
  Q_OBJECT

public:

  ConnectionGraphicsObject(NodeIndex const& leftNode,
                           PortIndex leftPortIndex,
                           NodeIndex const& rightNode,
                           PortIndex rightPortIndex,
                           FlowScene& scene);

  virtual
  ~ConnectionGraphicsObject();

  enum { Type = UserType + 2 };
  int
  type() const override
  {
    return Type;
  }

public:

  NodeIndex
  node(PortType pType) const
  {
    return pType == PortType::In ? _rightNode : _leftNode;
  }
  PortIndex
  portIndex(PortType pType) const
  {
    return pType == PortType::In ? _rightPortIndex : _leftPortIndex;
  }

  FlowScene&
  flowScene() const
  {
    return _scene;
  }

  ConnectionGeometry const&
  geometry() const
  {
    return _geometry;
  }
  ConnectionGeometry&
  geometry()
  {
    return _geometry;
  }

  ConnectionState const&
  state() const
  {
    return _state;
  }
  ConnectionState&
  state()
  {
    return _state;
  }

  QRectF
  boundingRect() const override;

  QPainterPath
  shape() const override;

  void
  setGeometryChanged();

  ConnectionID
  id() const;

  NodeDataType
  dataType(PortType ty) const;

  /// Updates the position of both ends
  void
  move();

  void
  lock(bool locked);

  const FlowScene&
  scene() const
  {
    return _scene;
  }

  FlowScene&
  scene()
  {
    return _scene;
  }

protected:

  void
  paint(QPainter* painter,
        QStyleOptionGraphicsItem const* option,
        QWidget* widget = 0) override;

  void
  mousePressEvent(QGraphicsSceneMouseEvent* event) override;

  void
  mouseMoveEvent(QGraphicsSceneMouseEvent* event) override;

  void
  mouseReleaseEvent(QGraphicsSceneMouseEvent* event) override;

  void
  hoverEnterEvent(QGraphicsSceneHoverEvent* event) override;

  void
  hoverLeaveEvent(QGraphicsSceneHoverEvent* event) override;

private:

  void
  addGraphicsEffect();

private:

  FlowScene & _scene;

  ConnectionGeometry _geometry;
  ConnectionState _state;

  NodeIndex _leftNode;
  NodeIndex _rightNode;

  PortIndex _leftPortIndex;
  PortIndex _rightPortIndex;

};
}