// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------

//! \addtogroup spop_symmat
//! @{

template <typename T1>
inline void spop_symmat::apply(SpMat<typename T1::elem_type>& out,
                               const SpOp<T1, spop_symmat>& in) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  const unwrap_spmat<T1> U(in.m);
  const SpMat<eT>& X = U.M;

  arma_conform_check((X.n_rows != X.n_cols),
                     "symmatu()/symmatl(): given matrix must be square sized");

  if (X.n_nonzero == uword(0)) {
    out.zeros(X.n_rows, X.n_cols);
    return;
  }

  const bool upper = (in.aux_uword_a == 0);

  const SpMat<eT> A =
      (upper) ? trimatu(X)
              : trimatl(X);  // in this case trimatu() and trimatl() return the same type
  const SpMat<eT> B = A.st();

  spglue_merge::symmat_merge(out, A, B);
}

template <typename T1>
inline void spop_symmat_cx::apply(SpMat<typename T1::elem_type>& out,
                                  const SpOp<T1, spop_symmat_cx>& in) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  const unwrap_spmat<T1> U(in.m);
  const SpMat<eT>& X = U.M;

  arma_conform_check((X.n_rows != X.n_cols),
                     "symmatu()/symmatl(): given matrix must be square sized");

  if (X.n_nonzero == uword(0)) {
    out.zeros(X.n_rows, X.n_cols);
    return;
  }

  const bool upper = (in.aux_uword_a == 0);
  const bool do_conj = (in.aux_uword_b == 1);

  const SpMat<eT> A =
      (upper) ? trimatu(X)
              : trimatl(X);  // in this case trimatu() and trimatl() return the same type

  if (do_conj) {
    const SpMat<eT> B = A.t();

    spglue_merge::symmat_merge(out, A, B);
  } else {
    const SpMat<eT> B = A.st();

    spglue_merge::symmat_merge(out, A, B);
  }
}

//! @}
