/* -*-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_FEATURES_IMAGE_TO_FEATURE_LAYER_H
#define OSGEARTH_FEATURES_IMAGE_TO_FEATURE_LAYER_H 1

#include <osgEarth/FeatureSource>
#include <osgEarth/LayerReference>
#include <osgEarth/ImageLayer>

namespace osgEarth
{
    /**
     * A FeatureSourceLayer that extracts features from raster data in
     * an image layer.
     */
    class OSGEARTH_EXPORT ImageToFeatureSource : public FeatureSource
    {
    public: // serialization
        class OSGEARTH_EXPORT Options : public FeatureSource::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, FeatureSource::Options);
            OE_OPTION_LAYER(ImageLayer, image);
            OE_OPTION(unsigned, level);
            OE_OPTION(std::string, attribute);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, ImageToFeatureSource, Options, FeatureSource, ImageToFeature);

        //! Image layer to use to convert raster data to features
        void setImageLayer(ImageLayer* layer);
        ImageLayer* getImageLayer() const;

        //! Level of detail at which to generation features
        void setLevel(const unsigned& level);
        const unsigned& getLevel() const;

        //! Attribute in which to store information
        void setAttribute(const std::string& value);
        const std::string& getAttribute() const;

    public: // FeatureLayer
        
        virtual FeatureCursor* createFeatureCursorImplementation(
            const Query& query,
            ProgressCallback* progress) const;

    public: // Layer

        virtual void init();

        virtual Status openImplementation();

        virtual void addedToMap(const Map*);

        virtual void removedFromMap(const Map*);

        virtual Config getConfig() const;
    };
} // namespace osgEarth

OSGEARTH_SPECIALIZE_CONFIG(osgEarth::ImageToFeatureSource::Options);

#endif // OSGEARTH_FEATURES_IMAGE_TO_FEATURE_LAYER_H