/* -*-c++-*- */
/* osgEarth - Geospatial SDK for OpenSceneGraph
 * Copyright 2020 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>
 */
#ifndef OSGEARTH_TRITON_LAYER
#define OSGEARTH_TRITON_LAYER 1

#include <osgEarth/VisibleLayer>
#include <osgEarth/LayerReference>
#include <osgEarth/ImageLayer>
#include "TritonCallback.h"
#include "TritonIntersections.h"

namespace osgEarth { namespace Triton
{
    /**
     * Node that roots the Triton adapter.
     */
    class TritonLayer : public osgEarth::VisibleLayer
    {
    public:
        class Options : public osgEarth::VisibleLayer::Options {
        public:
            META_LayerOptions(osgEarth, Options, osgEarth::VisibleLayer::Options);
            OE_OPTION(std::string, user);
            OE_OPTION(std::string, licenseCode);
            OE_OPTION(std::string, resourcePath);
            OE_OPTION(bool, useHeightMap, true);
            OE_OPTION(unsigned, heightMapSize, 1024);
            OE_OPTION(int, renderBinNumber, 12);
            OE_OPTION(float, maxAltitude, 50000.0f);
            OE_OPTION(std::string, vdatum, "egm96");
            OE_OPTION_LAYER(osgEarth::ImageLayer, maskLayer);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, TritonLayer, Options, osgEarth::VisibleLayer, triton);

        //! Sets the user callback that's invoked when Triton start up
        void setUserCallback(Triton::Callback* callback);

        //! User name for license
        void setUserName(const std::string& value);
        const std::string& getUserName() const;

        //! License code
        void setLicenseCode(const std::string& value);
        const std::string& getLicenseCode() const;

        //! Triton resource path
        void setResourcePath(const std::string& value);
        const std::string& getResourcePath() const;

        //! Whether to use a height map to fade out the ocean at the coastline
        void setUseHeightMap(const bool& value);
        const bool& getUseHeightMap() const;

        //! Size in texels of the height map (each dimension)
        void setHeightMapSize(const unsigned& value);
        const unsigned& getHeightMapSize() const;

        //! Render bin number to use for the ocean rendering
        void setRenderBinNumber(const int& value);
        const int& getRenderBinNumber() const;

        //! Masking layer for the ocean
        void setMaskLayer(osgEarth::ImageLayer* maskLayer);
        osgEarth::ImageLayer* getMaskLayer() const;

        //! Maximum visibility altitude
        void setMaxAltitude(const float& value);
        const float& getMaxAltitude() const;

        //! Vertical datum to use to calculate sea level
        void setVerticalDatum(const std::string& value);
        const std::string& getVerticalDatum() const;

        //! Adds an intersection set.
        //! Each frame, Triton will perform intersections against the ocean surface
        //! (including the waves) and populate the set with the results.
        void addIntersections(TritonIntersections*);

    public: // Layer

        virtual osg::Node* getNode() const;

        //! Serialize
        virtual Config getConfig() const;

    protected: // Layer

        virtual void init();

        virtual void addedToMap(const class osgEarth::Map*);

        virtual void removedFromMap(const class osgEarth::Map*);

    private:

        osg::ref_ptr<osg::Group> _root;
        osg::ref_ptr<osg::Node> _tritonNode;
        float _seaLevel;
        float _opacity;
    };

} } // namespace osgEarth::Triton

#endif // OSGEARTH_TRITON_LAYER