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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2010 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_ELEVATION_TERRAIN_LAYER_H
#define OSGEARTH_ELEVATION_TERRAIN_LAYER_H 1

#include <osgEarth/Common>
#include <osgEarth/Config>
#include <osgEarth/Caching>
#include <osgEarth/Profile>
#include <osgEarth/TileSource>
#include <osgEarth/TerrainLayer>

namespace osgEarth
{
    class OSGEARTH_EXPORT ElevationLayerOptions : public TerrainLayerOptions
    {
    public:
        ElevationLayerOptions( const ConfigOptions& options =ConfigOptions() );

        ElevationLayerOptions( const std::string& name, const TileSourceOptions& driverOptions );

    public:
        virtual Config getConfig() const;
        virtual void mergeConfig( const Config& conf );
        
    private:
        void fromConfig( const Config& conf );            
        void setDefaults();
    };

    //--------------------------------------------------------------------

    struct ElevationLayerCallback : public TerrainLayerCallback
    {
        //TODO
    };

    typedef void (ElevationLayerCallback::*ElevationLayerCallbackMethodPtr)(class ElevationLayer* layer);

    typedef std::list< osg::ref_ptr<ElevationLayerCallback> > ElevationLayerCallbackList;


    //--------------------------------------------------------------------

    class OSGEARTH_EXPORT ElevationLayer : public TerrainLayer
    {
    public:
        ElevationLayer( const ElevationLayerOptions& options );

        ElevationLayer( const std::string& name, const TileSourceOptions& driverOptions );

        ElevationLayer( const ElevationLayerOptions& options, TileSource* tileSource );

        const ElevationLayerOptions& getElevationLayerOptions() const { return _runtimeOptions; }
        virtual const TerrainLayerOptions& getTerrainLayerOptions() const { return _runtimeOptions; }

        void addCallback( ElevationLayerCallback* cb );

        void removeCallback( ElevationLayerCallback* cb );

    public: // methods

        osg::HeightField* createHeightField(
            const TileKey&    key,
            ProgressCallback* progress =0L );

    protected:
        
                virtual GeoHeightField createGeoHeightField( const TileKey& key, ProgressCallback* progress);
        
        virtual std::string suggestCacheFormat() const;

        virtual void initTileSource();

    private:
        ElevationLayerOptions _runtimeOptions;

        ElevationLayerCallbackList _callbacks;
        virtual void fireCallback( TerrainLayerCallbackMethodPtr method );
        virtual void fireCallback( ElevationLayerCallbackMethodPtr method );

        osg::ref_ptr<TileSource::HeightFieldOperation> _preCacheOp;

        void init();
    };

    typedef std::vector< osg::ref_ptr<ElevationLayer> > ElevationLayerVector;

} // namespace osgEarth

#endif // OSGEARTH_ELEVATION_TERRAIN_LAYER_H