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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_MGRS_GRATICLE
#define OSGEARTHUTIL_MGRS_GRATICLE

#include <osgEarthUtil/UTMGraticule>

namespace osgEarth { namespace Util
{
    using namespace osgEarth;
    using namespace osgEarth::Symbology;

    /**
     * Configuration options for the geodetic graticule.
     */
    class OSGEARTHUTIL_EXPORT MGRSGraticuleOptions : public UTMGraticuleOptions
    {
    public:
        MGRSGraticuleOptions( const Config& conf =Config() );

        /** dtor */
        virtual ~MGRSGraticuleOptions() { }

        /** Symbology for SQID lines and text */
        optional<Style>& secondaryStyle() { return _secondaryStyle; }
        const optional<Style>& secondaryStyle() const { return _secondaryStyle; }

    public:
        Config getConfig() const;

    protected:

        void mergeConfig( const Config& conf );

        optional<Style> _secondaryStyle;
    };


    /**
     * Implements a MGRS (Military Grid Reference System) map graticule. 
     * 
     * NOTE: So far, this only works for geocentric maps.
     * TODO: Add projected support; add text label support
     */
    class OSGEARTHUTIL_EXPORT MGRSGraticule : public UTMGraticule
    {
    public:

        /**
         * Constructs a new graticule for use with the specified map. The graticule
         * is created with several default levels. If you call addLevel(), the 
         * default levels are deleted.
         *
         * @param map
         *      Map with which you will use this graticule
         * @param options
         *      Optional "options" that configure the graticule. Defaults will be used
         *      if you don't specify this.
         */
        MGRSGraticule( MapNode* mapNode );
        MGRSGraticule( MapNode* mapNode, const MGRSGraticuleOptions& options);

        /** dtor */
        virtual ~MGRSGraticule() { }

        /** 
         * Applies a new set of options. The graticule will be rebuilt if necessary.
         */
        void setOptions( const MGRSGraticuleOptions& options );

        /**
         * Gets the options with which the graticule was built.
         */
        const MGRSGraticuleOptions& getOptions() const { return _options.value(); }

    public:
        osg::Node* buildSQIDTiles( const std::string& gzd );

    protected:
        optional<MGRSGraticuleOptions> _options;
        osg::ref_ptr<osg::Uniform>     _minDepthOffset;

    protected:
        virtual osg::Group* buildGZDChildren( osg::Group* node, const std::string& gzd );
        
        GeoExtent getExtent( const std::string& gzd, const std::string& sqid );

        friend class MGRSGraticuleFactory;
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_UTM_GRATICLE