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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_QUERY_H
#define OSGEARTH_ELEVATION_QUERY_H 1

#include <osgEarth/Map>
#include <osgEarth/MapNode>
#include <osgEarth/Utils>

namespace osgEarth
{
    class OSGEARTH_EXPORT ElevationQuery
    {
    public:
        enum Technique
        {
            TECHNIQUE_GEOMETRIC,

            TECHNIQUE_PARAMETRIC
        };

    public:
        ElevationQuery( const Map* map );
        ElevationQuery( const MapFrame& mapFrame );

        bool getElevation(
            const osg::Vec3d&       point,
            const SpatialReference* pointSRS,
            double&                 out_elevation,
            double                  desiredResolution    =0.0,
            double*                 out_actualResolution =0L );

        bool getElevations(
            std::vector<osg::Vec3d>& points,
            const SpatialReference*  pointsSRS,
            bool                     ignoreZ = true,
            double                   desiredResolution =0.0 );

        bool getElevations(
            const std::vector<osg::Vec3d>& points,
            const SpatialReference*        pointsSRS,
            std::vector<double>&           out_elevations,
            double                         desiredResolution = 0.0 );

        void setTechnique( Technique technique );

        Technique getTechnique() const;

        void setMaxTilesToCache( int value );

        int getMaxTilesToCache() const;

        void setInterpolation( ElevationInterpolation interp );

        ElevationInterpolation getElevationInterpolation() const;

        void setMaxLevelOverride(int maxLevelOverride);

        int getMaxLevelOverride() const;

    private:
        MapFrame _mapf;
        unsigned _maxCacheSize;
        int _tileSize;
        unsigned int _maxDataLevel;
        int _maxLevelOverride;
        Technique _technique;
        ElevationInterpolation _interpolation;

        typedef LRUCache< TileKey, osg::ref_ptr<osgTerrain::TerrainTile> > TileCache;
        TileCache _tileCache;


    private:
        void postCTOR();
        void sync();

        bool getElevationImpl(
            const osg::Vec3d&       point,
            const SpatialReference* pointSRS,
            double&                 out_elevation,
            double                  desiredResolution,
            double*                 out_actualResolution =0L );
    };

} // namespace osgEarth

#endif // OSGEARTH_ELEVATION_QUERY_H