/*
 * @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 "psi4/libqt/qt.h"
#include "defines.h"
#include "dfocc.h"

using namespace psi;

namespace psi {
namespace dfoccwave {

void DFOCC::ccd_3index_intr() {
    // defs
    SharedTensor2d T, U;

    // T(Q,ia) = \sum_{jb} b_jb^Q u_ij^ab = \sum_{jb} b(Q,jb) U(jb,ia)
    U = SharedTensor2d(new Tensor2d("U2 (IA|JB)", naoccA, navirA, naoccA, navirA));
    ccsd_u2_amps(U, t2);
    T = SharedTensor2d(new Tensor2d("T2 (Q|IA)", nQ, naoccA, navirA));
    T->gemm(false, false, bQiaA, U, 1.0, 0.0);
    U.reset();
    T->write(psio_, PSIF_DFOCC_AMPS);
    T.reset();

    // outfile->Printf("\t3indices done.\n");

}  // end ccd_3index_intr
}  // namespace dfoccwave
}  // namespace psi
