#pragma once

#include <QtCore/QUuid>
#include <QtWidgets/QGraphicsObject>

#include "Connection.hpp"

#include "NodeGeometry.hpp"
#include "NodeState.hpp"

class QGraphicsProxyWidget;

namespace QtNodes
{

	class FlowScene;
	class FlowItemEntry;

	/// Class reacts on GUI events, mouse clicks and
	/// forwards painting operation.
	class NodeGraphicsObject : public QGraphicsObject
	{
		Q_OBJECT

	public:
		NodeGraphicsObject(FlowScene& scene,
			Node& node);

		virtual
			~NodeGraphicsObject();

		Node&
			node();

		Node const&
			node() const;

		QRectF
			boundingRect() const override;

		void
			setGeometryChanged();

		/// Visits all attached connections and corrects
		/// their corresponding end points.
		void
			moveConnections() const;

		enum { Type = UserType + 1 };

		int
			type() const override { return Type; }

		void
			lock(bool locked);

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

		QVariant
			itemChange(GraphicsItemChange change, const QVariant& value) 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;

		void
			hoverMoveEvent(QGraphicsSceneHoverEvent*) override;

		void
			mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event) override;

		void
			contextMenuEvent(QGraphicsSceneContextMenuEvent* event) override;

	private:

		void
			embedQWidget();

	private:

		FlowScene& _scene;

		Node& _node;

		bool _locked;

		// either nullptr or owned by parent QGraphicsItem
		QGraphicsProxyWidget* _proxyWidget;
	};
}