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#ifndef DECLARATIVEBARS_H
#define DECLARATIVEBARS_H

#include "bars3dshared_p.h"
#include "qdatavis3dglobal.h"
#include "qdatavis3namespace.h"
#include "declarativebars_p.h"

#include <qsgsimpletexturenode.h>
#include <QQuickItem>
#include <QObject>

class QOpenGLFramebufferObject;
class QSGTexture;
class QQuickWindow;

QTENTERPRISE_DATAVIS3D_BEGIN_NAMESPACE

class DeclarativeBars : public QQuickItem
{
    Q_OBJECT
    Q_PROPERTY(SelectionMode selectionMode READ selectionMode WRITE setSelectionMode)
    Q_PROPERTY(LabelTransparency labelTransparency READ labelTransparency WRITE setLabelTransparency)
    Q_PROPERTY(ShadowQuality shadowQuality READ shadow WRITE setShadow)
    Q_PROPERTY(bool grid READ gridEnabled WRITE setGridEnabled)
    Q_PROPERTY(int width READ width WRITE setWidth)
    Q_PROPERTY(int height READ height WRITE setHeight)
    Q_ENUMS(SelectionMode)
    Q_ENUMS(ShadowQuality)
    Q_ENUMS(LabelTransparency)

protected:
    Bars3dShared *m_shared;
    DeclarativeBarsCachedStatePrivate *m_cachedState;

public:
    // Duplicated here to be able to use the same enums
    enum SelectionMode {
        ModeNone = 0,
        ModeBar,
        ModeBarAndRow,
        ModeBarAndColumn,
        ModeBarRowAndColumn,
        ModeZoomRow,
        ModeZoomColumn
    };

    enum ShadowQuality {
        ShadowNone = 0,
        ShadowLow = 1,
        ShadowMedium = 3,
        ShadowHigh = 5
    };

    enum LabelTransparency {
        TransparencyNone = 0,       // Full solid, using colors from theme
        TransparencyFromTheme,      // Use colors and transparencies from theme
        TransparencyNoBackground    // Draw just text on transparent background
    };

public:
    explicit DeclarativeBars(QQuickItem *parent = 0);
    ~DeclarativeBars();

    // Add a row of data. Each new row is added to the front of the sample space, moving previous
    // rows back (if sample space is more than one row deep)
    Q_INVOKABLE void addDataRow(const QVector<GLfloat> &dataRow,
                                const QString &labelRow = QString(),
                                const QVector<QString> &labelsColumn = QVector<QString>());
    // ownership of dataItems is transferred
    Q_INVOKABLE void addDataRow(const QVector<QDataItem*> &dataRow,
                                const QString &labelRow = QString(),
                                const QVector<QString> &labelsColumn = QVector<QString>());
    // ownership of dataRow is transferred
    Q_INVOKABLE void addDataRow(QDataRow *dataRow);

    // Add complete data set at a time, as a vector of data rows
    Q_INVOKABLE void addDataSet(const QVector< QVector<GLfloat> > &data,
                                const QVector<QString> &labelsRow = QVector<QString>(),
                                const QVector<QString> &labelsColumn = QVector<QString>());

    // ownership of dataItems is transferred
    Q_INVOKABLE void addDataSet(const QVector< QVector<QDataItem*> > &data,
                                const QVector<QString> &labelsRow = QVector<QString>(),
                                const QVector<QString> &labelsColumn = QVector<QString>());
    // ownership of dataSet is transferred
    Q_INVOKABLE void addDataSet(QDataSet* dataSet);

    // bar thickness, spacing between bars, and is spacing relative to thickness or absolute
    // y -component sets the thickness/spacing of z -direction
    // With relative 0.0f means side-to-side, 1.0f = one thickness in between
    Q_INVOKABLE void setBarSpecs(QSizeF thickness = QSizeF(1.0f, 1.0f),
                                 QSizeF spacing = QSizeF(1.0f, 1.0f),
                                 bool relative = true);

    // bar type; bars (=cubes), pyramids, cones, cylinders, etc.
    Q_INVOKABLE void setBarType(BarStyle style, bool smooth = false);

    // override bar type with own mesh
    Q_INVOKABLE void setMeshFileName(const QString &objFileName);

    // how many samples per row and column, and names for axes
    Q_INVOKABLE void setupSampleSpace(int samplesRow, int samplesColumn,
                                      const QString &labelRow = QString(),
                                      const QString &labelColumn = QString(),
                                      const QString &labelHeight = QString());

    // Select preset camera placement
    Q_INVOKABLE void setCameraPreset(CameraPreset preset);

    // Set camera rotation if you don't want to use the presets (in horizontal (-180...180) and
    // vertical (0...90) (or (-90...90) if there are negative values) angles and distance in
    // percentage (10...500))
    Q_INVOKABLE void setCameraPosition(GLfloat horizontal, GLfloat vertical, GLint distance = 100);

    // Set theme (bar colors, shaders, window color, background colors, light intensity and text
    // colors are affected)
    Q_INVOKABLE void setTheme(ColorTheme theme);

    // Set color if you don't want to use themes. Set uniform to false if you want the (height)
    // color to change from bottom to top
    Q_INVOKABLE void setBarColor(QColor baseColor, QColor heightColor, QColor depthColor,
                                 bool uniform = true);

    // Set tick count and step. Note; tickCount * step should be the maximum possible value of data
    // set. Minimum is the absolute minimum possible value a bar can have. This is especially
    // important to set if values can be negative.
    Q_INVOKABLE void setTickCount(GLint tickCount, GLfloat step, GLfloat minimum = 0.0f);

    // TODO: light placement API

    // Change selection mode; single bar, bar and row, bar and column, or all
    void setSelectionMode(SelectionMode mode);
    SelectionMode selectionMode();

    // Font size adjustment
    void setFontSize(float fontsize);
    float fontSize();

    // Set font
    void setFont(const QFont &font);
    QFont font();

    // Label transparency adjustment
    void setLabelTransparency(LabelTransparency transparency);
    LabelTransparency labelTransparency();

    // Enable or disable background grid
    void setGridEnabled(bool enable);
    bool gridEnabled();

    // Enable or disable background mesh
    void setBackgroundEnabled(bool enable);
    bool backgroundEnabled();

    // Adjust shadow quality
    void setShadowQuality(ShadowQuality quality);
    ShadowQuality shadowQuality();

    // Adjust shadow quality
    void setShadow(DeclarativeBars::ShadowQuality quality);
    DeclarativeBars::ShadowQuality shadow();

    protected:
        QSGNode *updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *);

};

// TODO: If we use texture node, our rendering is done into a texture that is then drawn to the
// qquickwindow -> selection will not work
class DeclarativeBarsRenderer : public QObject, public QSGSimpleTextureNode
{
    Q_OBJECT

public:
    DeclarativeBarsRenderer(QQuickWindow *window, Bars3dShared *shared);
    ~DeclarativeBarsRenderer();

public slots:
    void render();

private:
    QOpenGLFramebufferObject *m_fbo;
    QSGTexture *m_texture;
    QQuickWindow *m_window;
    Bars3dShared *m_barsRenderer;
};

QTENTERPRISE_DATAVIS3D_END_NAMESPACE
QTENTERPRISE_DATAVIS3D_USE_NAMESPACE

#endif