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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_COMPOSITE_TILE_SOURCE_H
#define OSGEARTH_COMPOSITE_TILE_SOURCE_H 1

#include <osgEarth/Common>
#include <osgEarth/TileSource>
#include <osgEarth/ImageLayer>

namespace osgEarth
{
    class OSGEARTH_EXPORT CompositeTileSourceOptions : public TileSourceOptions
    {
    public:
        CompositeTileSourceOptions( const TileSourceOptions& options =TileSourceOptions() );

        void add( const TileSourceOptions& options );

        void add( TileSource* source );

        void add( const ImageLayerOptions& options );

        void add( TileSource* source, const ImageLayerOptions& options );

    public:
        virtual Config getConfig() const;

    protected:
        virtual void mergeConfig( const Config& conf );

    private:
        void fromConfig( const Config& conf );

        struct Component {
            optional<TileSourceOptions>         _tileSourceOptions;
            optional<osg::ref_ptr<TileSource> > _tileSourceInstance;
            optional<ImageLayerOptions>         _imageLayerOptions;
        };

        typedef std::vector<Component> ComponentVector;
        ComponentVector _components;

        friend class CompositeTileSource;
    };

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

    class OSGEARTH_EXPORT CompositeTileSource : public TileSource
    {
    public:
        CompositeTileSource( const TileSourceOptions& options =TileSourceOptions() );

    public: // TileSource overrides
        
                virtual osg::Image* createImage( const TileKey& key, ProgressCallback* progress =0 );

        virtual bool isDynamic() const { return _dynamic; }
        
                virtual void initialize( const std::string& referenceURI, const Profile* overrideProfile =0L );

    protected:
        CompositeTileSourceOptions _options;
        bool _initialized;
        bool _dynamic;
       

        CompositeTileSourceOptions::ComponentVector _components;
    };
}

#endif // OSGEARTH_COMPOSITE_TILE_SOURCE_H