/* -*-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_ARCGIS_TILEPACKAGE_H
#define OSGEARTH_ARCGIS_TILEPACKAGE_H

#include <osgEarth/ImageLayer>
#include <osgEarth/ElevationLayer>
#include <osgEarth/URI>
#include <osgEarth/Feature>
#include <osgEarth/FeatureSource>
#include <vector>

/**
 * Layers that access an ArcGIS Tile Package file (.tpk)
 * http://pro.arcgis.com/en/pro-app/help/sharing/overview/tile-package.htm
 */
namespace osgEarth { namespace ArcGIS
{
    enum StorageFormat
    {
        STORAGE_FORMAT_COMPACT,
        STORAGE_FORMAT_COMPACTV2
    };


    // esriMapCacheStorageModeCompact bundle reader
    class OSGEARTH_EXPORT BundleReader
    {
    public:
        BundleReader(const std::string& bundleFile, unsigned int bundleSize);

        void init();

        void readIndex(const std::string& filename, std::vector<int>& index);

        osg::Image* readImage(const TileKey& key, const osgDB::ReaderWriter* rw);
        osg::Image* readImage(unsigned int index, const osgDB::ReaderWriter* rw);

        void readFeatures(const TileKey& key, FeatureList& features);

    protected:
        std::string _bundleFile;
        std::string _indexFile;
        unsigned int _bundleSize;

        std::ifstream _in;

        std::vector< int > _index;

        unsigned int _lod;
        unsigned int _rowOffset;
        unsigned int _colOffset;
    };

    // https://github.com/Esri/raster-tiles-compactcache/blob/master/CompactCacheV2.md
    // esriMapCacheStorageModeCompactV2 bundle reader
    class OSGEARTH_EXPORT BundleReader2
    {
    public:
        BundleReader2(const std::string& bundleFile, unsigned int bundleSize);

        void init();

        void readIndex(std::vector<unsigned long long>& index);

        osg::Image* readImage(const TileKey& key, const osgDB::ReaderWriter* rw);

        osg::Image* readImage(unsigned int index, const osgDB::ReaderWriter* rw);

        void readFeatures(const TileKey& key, FeatureList& features);


    protected:
        std::string _bundleFile;
        unsigned int _bundleSize;

        std::ifstream _in;

        std::vector< unsigned long long > _index;

        unsigned int _lod;
        unsigned int _rowOffset;
        unsigned int _colOffset;
    };
} }


namespace osgEarth
{
    /**
     * Image layer connected to an ESRI ArcGIS Tile Package file
     */
    class OSGEARTH_EXPORT ArcGISTilePackageImageLayer : public ImageLayer
    {
    public: // serialization
        class OSGEARTH_EXPORT Options : public ImageLayer::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, ImageLayer::Options);
            OE_OPTION(URI, url);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, ArcGISTilePackageImageLayer, Options, ImageLayer, ArcGISTilePackageImage);

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

    private:
        optional<ProfileOptions> _profileConf;
        unsigned _bundleSize;
        osg::ref_ptr<osgDB::ReaderWriter> _rw;
        ArcGIS::StorageFormat _storageFormat;

        void readConf();
    };

    /**
     * Elevation layer connected to an ESRI ArcGIS Tile Package file
     */
    class OSGEARTH_EXPORT ArcGISTilePackageElevationLayer : public ElevationLayer
    {
    public: // serialization
        class OSGEARTH_EXPORT Options : public ElevationLayer::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, ElevationLayer::Options);
            OE_OPTION(URI, url);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, ArcGISTilePackageElevationLayer, Options, ElevationLayer, ArcGISTilePackageElevation);

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

    public: // Layer

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

        //! 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 ~ArcGISTilePackageElevationLayer();

    private:
        optional<ProfileOptions> _profileConf;
        unsigned _bundleSize;
        osg::ref_ptr<osgDB::ReaderWriter> _rw;
        ArcGIS::StorageFormat _storageFormat;

        void readConf();
    };


    /**
    * Feature Layer that accesses ESRI VTPK layers.  This format is not very well documented.
    * https://github.com/syncpoint/openvtpk is a good starting point to understand it.
    */
    class OSGEARTH_EXPORT VTPKFeatureSource : public FeatureSource
    {
    public: // serialization

        class OSGEARTH_EXPORT Options : public FeatureSource::Options
        {
        public:
            META_LayerOptions(osgEarth, Options, FeatureSource::Options);
            OE_OPTION(URI, url);
            virtual Config getConfig() const;
        private:
            void fromConfig(const Config& conf);
        };

    public:
        META_Layer(osgEarth, VTPKFeatureSource, Options, FeatureSource, VTPKFeatures);

        //! Location of the resource
        void setURL(const URI& value);
        const URI& getURL() const;

    public: // Layer

        virtual Status openImplementation();

    protected:

        virtual void init();

    public: // FeatureSource

        FeatureCursor* createFeatureCursorImplementation(const Query& query, ProgressCallback* progress) const override;

    protected:

        virtual ~VTPKFeatureSource() { }

        void computeMinMaxLevel(unsigned int &min, unsigned int &max);

    private:
        unsigned _bundleSize;
        ArcGIS::StorageFormat _storageFormat;
    };

} // namespace osgEarth

OSGEARTH_SPECIALIZE_CONFIG(osgEarth::ArcGISTilePackageImageLayer::Options);
OSGEARTH_SPECIALIZE_CONFIG(osgEarth::ArcGISTilePackageElevationLayer::Options);
OSGEARTH_SPECIALIZE_CONFIG(osgEarth::VTPKFeatureSource::Options);

#endif // OSGEARTH_ARCGIS_TILEPACKAGE_H