/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2023                                                               *
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#ifndef __OPENSPACE_MODULE_SPACE___HORIZONSTRANSLATION___H__
#define __OPENSPACE_MODULE_SPACE___HORIZONSTRANSLATION___H__

#include <openspace/scene/translation.h>

#include <openspace/properties/list/stringlistproperty.h>
#include <openspace/util/timeline.h>
#include <ghoul/filesystem/file.h>
#include <ghoul/lua/luastate.h>
#include <modules/space/horizonsfile.h>
#include <memory>

namespace openspace {

namespace documentation { struct Documentation; }


/**
 * The HorizonsTranslation is based on text files generated from NASA JPL HORIZONS Website
 * (https://ssd.jpl.nasa.gov/horizons.cgi). The implementation supports both Vector
 * and Observer as Horizons data table
 *
 * In case of Vector table data the implementation expects a file with format:
 * TIME(JulianDayNumber = A.D. YYYY-MM-DD HH:MM:SS TDB)
 *   X(km) Y(km) Z(km)
 * TIME - Only the "YYYY-MM-DD HH:MM:SS" part is of interest, the rest is ignored
 * X - X position in kilometers in Ecliptic J2000 reference frame
 * Y - Y position in kilometers in Ecliptic J2000 reference frame
 * Z - Z position in kilometers in Ecliptic J2000 reference frame
 * Changes required in the "Table Settings" for compatible data:
 * 1. Under "Select Output Quantities" choose option "Position components {x, y, z} only"
 * 2. Uncheck the "Vector labels" options
 *
 * In case of Observer table data the implementation expects a file with format:
 * TIME(YYYY-MM-DD HH:MM:SS) Range(km) GalLon(degrees) GalLat(degrees)
 * Range - The distance from target to observer in kilometers
 * GalLon - Galactic Longitude in degrees
 * GalLat - Galactic Latitude in degrees
 * Changes required in the "Table Settings" for compatible data:
 * 1. Under "Observer Table Settings" uncheck all options except
 *    "Observer range & range-rate" and "Galactic longitude & latitude"
 * 2. Change "Range units" to "kilometers (km)" instead of "astronomical units (au)"
 * 3. Check the "Suppress range-rate" option
 */
class HorizonsTranslation : public Translation {
public:
    HorizonsTranslation();
    HorizonsTranslation(const ghoul::Dictionary& dictionary);

    glm::dvec3 position(const UpdateData& data) const override;

    static documentation::Documentation Documentation();

private:
    struct CacheKeyframe {
        double timestamp;
        std::array<double, 3> position;
    };

    void loadData();
    bool readHorizonsTextFile(HorizonsFile& horizonsFile);
    bool loadCachedFile(const std::filesystem::path& file);
    void saveCachedFile(const std::filesystem::path& file) const;

    properties::StringListProperty _horizonsTextFiles;
    ghoul::lua::LuaState _state;
    Timeline<glm::dvec3> _timeline;
};

} // namespace openspace

#endif // __OPENSPACE_MODULE_SPACE___HORIZONSTRANSLATION___H__
