// SPDX-License-Identifier: LGPL-2.1-or-later
/****************************************************************************
 *                                                                          *
 *   Copyright (c) 2025 Kacper Donat <kacper@kadet.net>                     *
 *                                                                          *
 *   This file is part of FreeCAD.                                          *
 *                                                                          *
 *   FreeCAD is free software: you can redistribute it and/or modify it     *
 *   under the terms of the GNU Lesser General Public License as            *
 *   published by the Free Software Foundation, either version 2.1 of the   *
 *   License, or (at your option) any later version.                        *
 *                                                                          *
 *   FreeCAD is distributed in the hope that it will be useful, but         *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
 *   Lesser General Public License for more details.                        *
 *                                                                          *
 *   You should have received a copy of the GNU Lesser General Public       *
 *   License along with FreeCAD. If not, see                                *
 *   <https://www.gnu.org/licenses/>.                                       *
 *                                                                          *
 ***************************************************************************/

#ifndef PARTGUI_VIEWPROVIDERPREVIEWEXTENSION_H
#define PARTGUI_VIEWPROVIDERPREVIEWEXTENSION_H

#include "SoBrepEdgeSet.h"
#include "SoBrepFaceSet.h"
#include "SoBrepPointSet.h"

#include <QtCore>

#include <Inventor/nodes/SoSubNode.h>
#include <Inventor/nodes/SoCoordinate3.h>
#include <Inventor/nodes/SoNormal.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/fields/SoSFColor.h>
#include <Inventor/fields/SoSFFloat.h>

#include <App/PropertyStandard.h>
#include <Gui/ViewProvider.h>

#include <Gui/ViewProviderExtension.h>
#include <Gui/ViewProviderExtensionPython.h>
#include <Mod/Part/App/TopoShape.h>

namespace PartGui {

class PartGuiExport SoPreviewShape : public SoSeparator {
    using inherited = SoSeparator;
    SO_NODE_HEADER(SoPreviewShape);

public:
    static constexpr float defaultTransparency = 0.8F;
    static constexpr float defaultLineWidth = 2.0F;
    static const SbColor defaultColor;

    SoPreviewShape();

    SoSFColor color;
    SoSFFloat transparency;
    SoSFFloat lineWidth;

    SoCoordinate3* coords;
    SoNormal* norm;

    SoBrepFaceSet* faceset;
    SoBrepEdgeSet* lineset;
    SoBrepPointSet* nodeset;
};

class PartGuiExport ViewProviderPreviewExtension : public Gui::ViewProviderExtension {
    Q_DECLARE_TR_FUNCTIONS(PartDesignGui::ViewProviderPreviewExtension)
    EXTENSION_PROPERTY_HEADER_WITH_OVERRIDE(Gui::ViewProviderPreviewExtension);

public:
    App::PropertyColor PreviewColor;

    ViewProviderPreviewExtension();

    /// Returns shape that should be used as the preview
    virtual Part::TopoShape getPreviewShape() const { return Part::TopoShape(); };

    void extensionAttach(App::DocumentObject*) override;
    void extensionBeforeDelete() override;

    /// Returns whatever preview is enabled or not
    bool isPreviewEnabled() const { return _isPreviewEnabled; }
    /// Switches preview on or off
    virtual void showPreview(bool enable);

protected:
    void extensionOnChanged(const App::Property* prop) override;

    /// updates geometry of the preview shape
    void updatePreviewShape();

    Gui::CoinPtr<SoSeparator> pcPreviewRoot;
    Gui::CoinPtr<SoPreviewShape> pcPreviewShape;

private:
    bool _isPreviewEnabled {false};
};

using ViewProviderPreviewExtensionPython = Gui::ViewProviderExtensionPythonT<ViewProviderPreviewExtension>;

}


#endif  // PARTGUI_VIEWPROVIDERPREVIEWEXTENSION_H