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#ifndef GLWIDGET_H
#define GLWIDGET_H

#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QOpenGLBuffer>
#include <QVector3D>
#include <QMatrix4x4>
#include <QElapsedTimer>
#include <QVector>
#include <QPushButton>

class Bubble;
class MainWindow;

QT_FORWARD_DECLARE_CLASS(QOpenGLTexture)
QT_FORWARD_DECLARE_CLASS(QOpenGLShader)
QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)

class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
{
    Q_OBJECT
public:
    GLWidget(MainWindow *mw, bool button, const QColor &background);
    ~GLWidget();

public slots:
    void setScaling(int scale);
    void setLogo();
    void setTexture();
    void setShowBubbles(bool);
    void setTransparent(bool transparent);

private slots:
    void handleButtonPress();

protected:
    void resizeGL(int w, int h) override;
    void paintGL() override;
    void initializeGL() override;

private:
    void paintTexturedCube();
    void paintQtLogo();
    void createGeometry();
    void createBubbles(int number);
    void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
    void extrude(qreal x1, qreal y1, qreal x2, qreal y2);

    MainWindow *m_mainWindow;
    qreal m_fAngle;
    qreal m_fScale;
    bool m_showBubbles;
    QVector<QVector3D> m_vertices;
    QVector<QVector3D> m_normals;
    bool m_qtLogo;
    QList<Bubble *> m_bubbles;
    int m_frames;
    QElapsedTimer m_time;
    QOpenGLShader *m_vshader1;
    QOpenGLShader *m_fshader1;
    QOpenGLShader *m_vshader2;
    QOpenGLShader *m_fshader2;
    QOpenGLShaderProgram *m_program1;
    QOpenGLShaderProgram *m_program2;
    QOpenGLTexture *m_texture;
    QOpenGLBuffer m_vbo1;
    QOpenGLBuffer m_vbo2;
    int m_vertexAttr1;
    int m_normalAttr1;
    int m_matrixUniform1;
    int m_vertexAttr2;
    int m_normalAttr2;
    int m_texCoordAttr2;
    int m_matrixUniform2;
    int m_textureUniform2;
    bool m_transparent;
    QPushButton *m_btn;
    bool m_hasButton;
    QColor m_background;
};

#endif