#ifndef GAMEVIEW_H

#define GAMEVIEW_H

#include <QQuickItem>

#include <QPointer>

#include <QScopedPointer>

#include <QtGui/QOpenGLFunctions>

#include <QtGui/QOpenGLShaderProgram>

#include "engine_instance.h"

class GameViewRenderer : public QObject, protected QOpenGLFunctions {

  Q_OBJECT

 public:

  explicit GameViewRenderer();

  ~GameViewRenderer() override;

  void tick(quint32 delta);

  void setEngineInstance(EngineInstance* engineInstance);

 public slots:

  void paint();

  void onViewportSizeChanged(QQuickWindow* window);

 private:

  quint32 m_delta;

  QPointer<EngineInstance> m_engineInstance;

};

class GameView : public QQuickItem {

  Q_OBJECT

  Q_PROPERTY(EngineInstance* engineInstance READ engineInstance WRITE

                 setEngineInstance NOTIFY engineInstanceChanged)

 public:

  explicit GameView(QQuickItem* parent = nullptr);

  Q_INVOKABLE void tick(quint32 delta);

  EngineInstance* engineInstance() const;

 signals:

  void engineInstanceChanged(EngineInstance* engineInstance);

 public slots:

  void sync();

  void cleanup();

  void setEngineInstance(EngineInstance* engineInstance);

 private slots:

  void handleWindowChanged(QQuickWindow* win);

 private:

  quint32 m_delta;

  QScopedPointer<GameViewRenderer> m_renderer;

  bool m_windowChanged;

  QPointer<EngineInstance> m_engineInstance;

  QSize m_viewportSize;

  QPoint m_centerPoint;

};

#endif  // GAMEVIEW_H