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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2013 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 OSGEARTHUTIL_VOLUME_LINEOFSIGHT
#define OSGEARTHUTIL_VOLUME_LINEOFSIGHT 1

#include <osgEarthUtil/LineOfSight>
#include <osgEarth/MapNode>
#include <osgEarth/GeoData>
#include <osgEarth/Units>
#include <osgEarthAnnotation/LocalizedNode>
#include <osgEarth/Terrain>
#include <osg/Geode>

namespace osgEarth { namespace Util
{
    using namespace osgEarth;
    using namespace osgEarth::Annotation;

    /**
     * A Node that display a line of sight polytope.
     */
    class OSGEARTHUTIL_EXPORT PolyhedralLineOfSightNode : public LocalizedNode
    {
    public:
        /**
         * Constructs a new PolyhedralLineOfSightNode.
         * @param mapNode MapNode this LOS is operating under.
         */
        PolyhedralLineOfSightNode( MapNode* mapNode );

        virtual ~PolyhedralLineOfSightNode();

        /**
         * The maximum sampling range from the center point
         */
        void setDistance( const Distance& value );
        const Distance& getDistance() const { return _distance; }

        /** 
         * The azimuthal range for the LOS sampling
         */
        void setAzimuthalRange( const Angle& start, const Angle& end );
        void getAximuthalRange( Angle& out_start, Angle& out_end );

        /**
         * The elevation (pitch) range for the LOS sampling
         */
        void setElevationRange( const Angle& start, const Angle& end );
        void getElevationRange( Angle& out_start, Angle& out_end );

        /**
         * The sample spacing (in both azimuth and elevation)
         */
        void setSampleSpacing( const Angle& spacing );
        const Angle& getSampleSpacing() const { return _spacing; }

        /**
         * Manage callbacks that report whether the LOS has changed
         */
        void addChangedCallback( LOSChangedCallback* callback );
        void removeChangedCallback( LOSChangedCallback* callback );

    public: // LocalizedNode
        
        virtual bool setPosition( const GeoPoint& pos );
        virtual osg::MatrixTransform* getTransform() { return _xform.get(); }

    public: // MapNodeObserver

        virtual void setMapNode( MapNode* mapNode );

    public:
        // internal: called when the underlying terrain changes and resampling
        // is required
        void terrainChanged( const osgEarth::TileKey& tileKey, osg::Node* terrain );

        virtual void traverse(osg::NodeVisitor& nv);

    protected:

        Angle                  _startAzim, _endAzim;
        Angle                  _startElev, _endElev;
        Angle                  _spacing;
        Distance               _distance;
        LOSChangedCallbackList _changedCallbacks;
        unsigned               _numRows;
        unsigned               _numCols;
        osg::Geode*            _geode;
        GeoExtent              _extent;

        osg::ref_ptr<osg::MatrixTransform> _xform;

        osg::ref_ptr< TerrainCallback > _terrainCallback;

        void dirty();
        void rebuildGeometry();
        void updateSamples();
        void recalculateExtent();
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_VOLUME_LINEOFSIGHT