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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2022                                                               *
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#include <modules/space/translation/gptranslation.h>

#include <modules/space/kepler.h>
#include <openspace/documentation/verifier.h>
#include <filesystem>
#include <optional>

namespace {
    struct [[codegen::Dictionary(GPTranslation)]] Parameters {
        // Specifies the filename of the general pertubation file
        std::filesystem::path file;

        enum class [[codegen::map(openspace::kepler::Format)]] Format {
            // A NORAD-style Two-Line element
            TLE,
            // Orbit Mean-Elements Message in the KVN notation
            OMM,
            // JPL's Small Bodies Database
            SBDB
        };
        // The file format that is contained in the file
        Format format;

        // Specifies the element within the file that should be used in case the file
        // provides multiple general pertubation elements. Defaults to 1.
        std::optional<int> element [[codegen::greater(0)]];
    };
#include "gptranslation_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation GPTranslation::Documentation() {
    return codegen::doc<Parameters>("space_transform_gp");
}

GPTranslation::GPTranslation(const ghoul::Dictionary& dictionary) {
    const Parameters p = codegen::bake<Parameters>(dictionary);
    if (!std::filesystem::is_regular_file(p.file)) {
        throw ghoul::RuntimeError("The provided TLE file must exist");
    }

    int element = p.element.value_or(1);

    std::vector<kepler::Parameters> parameters = kepler::readFile(
        p.file,
        codegen::map<kepler::Format>(p.format)
    );
    if (parameters.size() < element) {
        throw ghoul::RuntimeError(fmt::format(
            "Requested element {} but only {} are available", element, parameters.size()
        ));
    }

    kepler::Parameters param = parameters[element - 1];
    setKeplerElements(
        param.eccentricity,
        param.semiMajorAxis,
        param.inclination,
        param.ascendingNode,
        param.argumentOfPeriapsis,
        param.meanAnomaly,
        param.period,
        param.epoch
    );
}

} // namespace openspace