/*
 * @BEGIN LICENSE
 *
 * Psi4: an open-source quantum chemistry software package
 *
 * Copyright (c) 2007-2019 The Psi4 Developers.
 *
 * The copyrights for code used from other parties are included in
 * the corresponding files.
 *
 * This file is part of Psi4.
 *
 * Psi4 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, version 3.
 *
 * Psi4 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 Psi4; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * @END LICENSE
 */

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <sstream>

#include "psi4/psifiles.h"
#include "psi4/libciomr/libciomr.h"
#include "psi4/libpsio/psio.h"
#include "psi4/libpsio/psio.hpp"
#include "psi4/libiwl/iwl.h"
#include "psi4/libqt/qt.h"
#include "psi4/libpsi4util/process.h"
#include "psi4/liboptions/liboptions.h"
#include "psi4/libpsi4util/exception.h"

#include "psi4/psi4-dec.h"

#include "mp2.h"

namespace psi {
namespace dfmp2 {

SharedWavefunction dfmp2(SharedWavefunction ref_wfn, Options& options) {
    auto psio = std::make_shared<PSIO>();

    std::shared_ptr<Wavefunction> dfmp2;
    if (options.get_str("REFERENCE") == "RHF" || options.get_str("REFERENCE") == "RKS") {
        dfmp2 = std::make_shared<RDFMP2>(ref_wfn, options, psio);
    } else if (options.get_str("REFERENCE") == "UHF" || options.get_str("REFERENCE") == "UKS") {
        dfmp2 = std::make_shared<UDFMP2>(ref_wfn, options, psio);
    } else if (options.get_str("REFERENCE") == "ROHF") {
        dfmp2 = std::make_shared<RODFMP2>(ref_wfn, options, psio);
    } else {
        throw PSIEXCEPTION("DFMP2: Unrecognized reference");
    }

    return dfmp2;
}
}  // namespace dfmp2
}  // namespace psi
