/* -*-c++-*- */
/* osgEarth - Geospatial SDK for OpenSceneGraph
 * Copyright 2020 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_ARCGISSERVER_H
#define OSGEARTH_ARCGISSERVER_H

#include <osgEarth/Common>
#include <osgEarth/ImageLayer>
#include <osgEarth/ElevationLayer>
#include <osgEarth/URI>
#include <vector>

/**
 * Layers that access an ArcGIS Server REST endpoint
 * http://services.arcgisonline.com/arcgis/sdk/rest/index.html
 */
namespace osgEarth
{
    namespace ArcGISServer
    {
        class OSGEARTH_EXPORT MapServiceLayer
        {
        public:
            MapServiceLayer(int id, const std::string& name);

            int getId() const;
            const std::string& getName() const;

        private:
            int id;
            std::string name;
        };

        using MapServiceLayerList = std::vector<MapServiceLayer>;

        class OSGEARTH_EXPORT TileInfo
        {
        public:
            TileInfo();
            TileInfo(int tile_size, const std::string& format, int min_level, int max_level, int _num_tiles_wide, int _num_tiles_high);
            TileInfo(const TileInfo& rhs);

            bool isValid() const;
            int getTileSize() const;
            const std::string& getFormat() const;
            int getMinLevel() const;
            int getMaxLevel() const;
            int getNumTilesWide() const;
            int getNumTilesHigh() const;

        private:
            std::string format;
            int tile_size;
            int min_level, max_level;
            bool is_valid;
            int num_tiles_wide;
            int num_tiles_high;
        };

        class OSGEARTH_EXPORT MapService
        {
        public:
            MapService();

            /**
             * Initializes a map service interface and populates its metadata from the
             * provided REST API URL (e.g.: http://server/ArcGIS/rest/services/MyMapService)
             * Call isValid() to verify success.
             */
            bool init(const URI& uri, const osgDB::Options* options = 0L);

            /**
             * Returns true if the map service initialized successfully.
             */
            bool isValid() const;

            bool isTiled() const;

            /**
             * If isValid() returns false, this method will return the error message.
             */
            const std::string& getError() const;

            /**
             * Gets the data profile associated with this map service.
             */
            const Profile* getProfile() const;

            /**
             * Gets the tile information for this service.
             */
            const TileInfo& getTileInfo() const;

            /**
             * Gets the copyright text for the layer
             */
            const std::string& getCopyright() const;

        private:
            bool is_valid;
            URI uri;
            osg::ref_ptr<const Profile> profile;
            std::string error_msg;
            MapServiceLayerList layers;
            bool tiled;
            TileInfo tile_info;
            std::string _copyright;

            bool setError(const std::string&);
        };
    };
}


namespace osgEarth
{
    class OSGEARTH_EXPORT ArcGISServerOptions
    {
    public:
        OE_OPTION(URI, url);
        OE_OPTION(std::string, token);
        OE_OPTION(std::string, format);
        OE_OPTION(std::string, layers);
        void readFrom(const Config& conf);
        void writeTo(Config&) const;
    };

    /**
     * Image layer connected to an ESRI ArcGIS Server API endpoint
     */
    class OSGEARTH_EXPORT ArcGISServerImageLayer : public ImageLayer
    {
    public:
        // serialization data
        class OSGEARTH_EXPORT Options : public ArcGISServerOptions, public ImageLayer::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, ImageLayer::Options);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, ArcGISServerImageLayer, Options, ImageLayer, ArcGISServerImage);

    public:
        //! URL of the map service endpoint
        void setURL(const URI& value);
        const URI& getURL() const;

        //! API security token
        void setToken(const std::string& value);
        const std::string& getToken() const;

        //! Override the imagery format reported in the service's metadata
        void setFormat(const std::string& value);
        const std::string& getFormat() const;

        //! Override the layer specification reported in the service's metadata
        void setLayers(const std::string& value);
        const std::string& getLayers() const;

    public: // Layer

        //! Establishes a connection to the service
        virtual Status openImplementation();

        //! Creates a raster image for the given tile key
        virtual GeoImage createImageImplementation(const TileKey& key, ProgressCallback* progress) const;

    protected: // Layer

        //! Called by constructors
        virtual void init();

    protected:

        //! Destructor
        virtual ~ArcGISServerImageLayer();

    private:
        optional<ProfileOptions> _profileConf;
        std::string _map;
        std::string _layers;
        std::string _format, _dot_format;
        std::string _copyright;
        ArcGISServer::MapService _map_service;
    };



    /**
     * Elevation layer connected to an ESRI ArcGIS Server API endpoint
     */
    class OSGEARTH_EXPORT ArcGISServerElevationLayer : public ElevationLayer
    {
    public:
        // serialization data
        class OSGEARTH_EXPORT Options : public ArcGISServerOptions, public ElevationLayer::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, ElevationLayer::Options);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, ArcGISServerElevationLayer, Options, ElevationLayer, ArcGISServerElevation);

    public:
        //! URL of the map service endpoint
        void setURL(const URI& value);
        const URI& getURL() const;

        //! API security token
        void setToken(const std::string& value);
        const std::string& getToken() const;

        //! Override the imagery format reported in the service's metadata
        void setFormat(const std::string& value);
        const std::string& getFormat() const;

        //! Override the layer specification reported in the service's metadata
        void setLayers(const std::string& value);
        const std::string& getLayers() const;

    public: // Layer

        virtual Status openImplementation();
        virtual Status closeImplementation();

        //! Creates a heightfield for the given tile key
        virtual GeoHeightField createHeightFieldImplementation(const TileKey& key, ProgressCallback* progress) const;

    protected: // Layer

        //! Called by constructors
        virtual void init();

    protected:

        //! Destructor
        virtual ~ArcGISServerElevationLayer() {};

    private:
        osg::ref_ptr<ArcGISServerImageLayer> _imageLayer;
    };

} // namespace osgEarth

OSGEARTH_SPECIALIZE_CONFIG(osgEarth::ArcGISServerImageLayer::Options);
OSGEARTH_SPECIALIZE_CONFIG(osgEarth::ArcGISServerElevationLayer::Options);

#endif // OSGEARTH_ARCGISSERVER_H