/* -*-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_CESIUMION_H
#define OSGEARTH_CESIUMION_H

#include <osgEarth/Common>
#include <osgEarth/ImageLayer>
#include <osgEarth/TerrainMeshLayer>
#include <osgEarth/ThreeDTilesLayer>
#include <osgEarth/URI>


namespace osgEarth
{
    class OSGEARTH_EXPORT CesiumIonResource
    {
    public:
        Status open(
            const URI& server,
            const std::string& assedId,
            const std::string& token,
            const osgDB::Options* readOptions);

    public:
        std::string _acceptHeader;
        std::string _resourceToken;
        std::string _resourceUrl;
        std::string _externalType;
        Json::Value _externalOptions;
    };

    /**
     * Image layer connection to a Cesium ION server.
     */
    class OSGEARTH_EXPORT CesiumIonImageLayer : public ImageLayer
    {
    public: // serialization
        class OSGEARTH_EXPORT Options : public ImageLayer::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, ImageLayer::Options);
            OE_OPTION(URI, server);
            OE_OPTION(std::string, assetId);
            OE_OPTION(std::string, token);
            static Config getMetadata();
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, CesiumIonImageLayer, Options, ImageLayer, CesiumIonImage);

    public:
        //! Base URL for requests
        void setServer(const URI& value);
        const URI& getServer() const;

        //! Asset identifier
        void setAssetId(const std::string& value);
        const std::string& getAssetId() const;

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

    public: // Layer

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

        virtual Status closeImplementation();

        //! 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 ~CesiumIonImageLayer() { }

    private:
        osg::ref_ptr< ImageLayer > _imageLayer;

        std::string _key;
    };

    /**
     * Elevation layer connection to a Cesium ION server.
     */
    class OSGEARTH_EXPORT CesiumIonTerrainMeshLayer : public TerrainMeshLayer
    {
    public: // serialization
        class OSGEARTH_EXPORT Options : public TerrainMeshLayer::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, TerrainMeshLayer::Options);
            OE_OPTION(URI, server);
            OE_OPTION(std::string, assetId);
            OE_OPTION(std::string, token);
            static Config getMetadata();
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, CesiumIonTerrainMeshLayer, Options, TerrainMeshLayer, CesiumIonTerrainMesh);

    public:
        //! Base URL for requests
        void setServer(const URI& value);
        const URI& getServer() const;

        //! Asset identifier
        void setAssetId(const std::string& value);
        const std::string& getAssetId() const;

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

    public: // Layer

        //! Establishes a connection to the TMS repository
        virtual Status openImplementation() override;

        virtual Status closeImplementation() override;

        virtual TileMesh createTileImplementation(
            const TileKey& key,
            ProgressCallback* progress) const override;

    protected: // Layer

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

    protected:

        //! Destructor
        virtual ~CesiumIonTerrainMeshLayer() { }

    private:

        URI _assetURI;
        std::string _key;        
    };

    /**
     * Cesium Ion 3d tiles layer
     */
    class OSGEARTH_EXPORT CesiumIon3DTilesLayer : public osgEarth::Contrib::ThreeDTilesLayer
    {
    public: // serialization
        class OSGEARTH_EXPORT Options : public osgEarth::Contrib::ThreeDTilesLayer::Options {
        public:
            META_LayerOptions(osgEarth, Options, osgEarth::Contrib::ThreeDTilesLayer::Options);
            OE_OPTION(URI, server);
            OE_OPTION(std::string, assetId);
            OE_OPTION(std::string, token);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, CesiumIon3DTilesLayer, Options, ThreeDTilesLayer, CesiumIon3DTiles);

    public:
        //! Base URL for requests
        void setServer(const URI& value);
        const URI& getServer() const;

        //! Asset identifier
        void setAssetId(const std::string& value);
        const std::string& getAssetId() const;

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

    public: // Layer

        //! Open the layer and return its status
        virtual Status openImplementation();

    protected: // Layer

        //! post-ctor initialization
        virtual void init();

        std::string _key;
    };

} // namespace osgEarth

OSGEARTH_SPECIALIZE_CONFIG(osgEarth::CesiumIonImageLayer::Options);
OSGEARTH_SPECIALIZE_CONFIG(osgEarth::CesiumIon3DTilesLayer::Options);

#endif // OSGEARTH_CESIUMION_H