#include <Interpreters/ExternalModels.h>
#include <Interpreters/Context.h>

namespace DB
{

namespace ErrorCodes
{
    extern const int INVALID_CONFIG_PARAMETER;
}

namespace
{

    const ExternalLoaderUpdateSettings externalModelsUpdateSettings { };

    const ExternalLoaderConfigSettings & getExternalModelsConfigSettings()
    {
        static ExternalLoaderConfigSettings settings;
        static std::once_flag flag;

        std::call_once(flag, []
        {
            settings.external_config = "model";
            settings.external_name = "name";
            settings.path_setting_name = "models_config";
        });

        return settings;
    }
}


ExternalModels::ExternalModels(
    std::unique_ptr<IExternalLoaderConfigRepository> config_repository,
    Context & context,
    bool throw_on_error)
        : ExternalLoader(context.getConfigRef(),
                         externalModelsUpdateSettings,
                         getExternalModelsConfigSettings(),
                         std::move(config_repository),
                         &Logger::get("ExternalModels"),
                         "external model"),
          context(context)
{
    init(throw_on_error);
}

std::unique_ptr<IExternalLoadable> ExternalModels::create(
        const std::string & name, const Configuration & config, const std::string & config_prefix)
{
    String type = config.getString(config_prefix + ".type");
    ExternalLoadableLifetime lifetime(config, config_prefix + ".lifetime");

    /// TODO: add models factory.
    if (type == "catboost")
    {
        return std::make_unique<CatBoostModel>(
                name, config.getString(config_prefix + ".path"),
                context.getConfigRef().getString("catboost_dynamic_library_path"),
                lifetime
        );
    }
    else
    {
        throw Exception("Unknown model type: " + type, ErrorCodes::INVALID_CONFIG_PARAMETER);
    }
}

}