/*
 * (C) Copyright 1996- ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * In applying this licence, ECMWF does not waive the privileges and immunities
 * granted to it by virtue of its status as an intergovernmental organisation nor
 * does it submit to any jurisdiction.
 */


#pragma once

#include "mir/repres/Representation.h"
#include "mir/util/Domain.h"


namespace mir::repres::sh {


class SphericalHarmonics : public Representation {
public:
    // -- Exceptions
    // None

    // -- Constructors

    SphericalHarmonics(const param::MIRParametrisation&);
    SphericalHarmonics(size_t truncation);
    SphericalHarmonics(const SphericalHarmonics&) = delete;

    // -- Destructor

    ~SphericalHarmonics() override;

    // -- Convertors
    // None

    // -- Operators

    SphericalHarmonics& operator=(const SphericalHarmonics&) = delete;

    // -- Methods

    static void truncate(size_t truncation_from, size_t truncation_to, const MIRValuesVector& in, MIRValuesVector& out);

    static size_t number_of_complex_coefficients(size_t truncation) { return (truncation + 1) * (truncation + 2) / 2; }

    static void interlace_spectra(MIRValuesVector& interlaced, const MIRValuesVector& spectra, size_t truncation,
                                  size_t numberOfComplexCoefficients, size_t index, size_t indexTotal);

    // -- Overridden methods

    util::Domain domain() const override { return util::Domain(); }

    // -- Class members
    // None

    // -- Class methods
    // None

protected:
    // -- Members
    // None

    // -- Methods

    void print(std::ostream&) const override;

    // -- Overridden methods
    // None

    // -- Class members
    // None

    // -- Class methods
    // None

private:
    // -- Members

    size_t truncation_;

    // -- Methods
    // None

    // -- Overridden methods

    void fillGrib(grib_info&) const override;
    void fillJob(api::MIRJob&) const override;
    void estimate(api::MIREstimation&) const override;
    std::string factory() const override;

    const Representation* truncate(size_t truncation, const MIRValuesVector&, MIRValuesVector&) const override;
    size_t truncation() const override;

    void comparison(std::string&) const override;

    void validate(const MIRValuesVector&) const override;
    size_t numberOfValues() const override;

    void makeName(std::ostream&) const override;
    bool sameAs(const Representation&) const override;

    bool isPeriodicWestEast() const override;
    bool includesNorthPole() const override;
    bool includesSouthPole() const override;

    // -- Class members
    // None

    // -- Class methods
    // None

    // -- Friends
    // None
};


}  // namespace mir::repres::sh
