/* -*-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_FEATURE_ELEVATION_LAYER
#define OSGEARTH_FEATURE_ELEVATION_LAYER 1

#include <osgEarth/Common>
#include <osgEarth/FeatureSource>
#include <osgEarth/ElevationLayer>
#include <osgEarth/LayerReference>

namespace osgEarth
{
    /**
     * Elevation layer that sets elevation based on feature data
     */
    class OSGEARTH_EXPORT FeatureElevationLayer : public ElevationLayer
    {
    public: // serialization
        class OSGEARTH_EXPORT Options : public ElevationLayer::Options {
        public:
            META_LayerOptions(osgEarth, Options, ElevationLayer::Options);
            OE_OPTION(std::string, attr);
            OE_OPTION(double, offset);
            OE_OPTION_LAYER(FeatureSource, featureSource);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, FeatureElevationLayer, Options, ElevationLayer, FeatureElevation);

    public: // ElevationLayer

        // opens the layer and returns the status
        virtual Status openImplementation();

        virtual void init();

        virtual Config getConfig() const;

    protected: // Layer

        // called by the map when this layer is added/removed
        virtual void addedToMap(const class Map*);

        virtual void removedFromMap(const class Map*);

        virtual GeoHeightField createHeightFieldImplementation(
            const TileKey& key,
            ProgressCallback* progress) const;

    protected:

        virtual ~FeatureElevationLayer();

        GeoExtent _extent;

        bool intersects(const TileKey&) const;
    };
} // namespace osgEarth

#endif // OSGEARTH_FEATURE_ELEVATION_LAYER