// 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_vectorise
//! @{

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

  spop_vectorise_col::apply_direct(out, in.m);
}

template <typename T1>
inline void spop_vectorise_col::apply_direct(SpMat<typename T1::elem_type>& out,
                                             const T1& expr) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  if (out.vec_state == 0) {
    out = expr;

    out.reshape(out.n_elem, 1);
  } else {
    SpMat<eT> tmp = expr;

    tmp.reshape(tmp.n_elem, 1);

    out.steal_mem(tmp);
  }
}

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

  spop_vectorise_row::apply_direct(out, in.m);
}

template <typename T1>
inline void spop_vectorise_row::apply_direct(SpMat<typename T1::elem_type>& out,
                                             const T1& expr) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  // NOTE: row-wise vectorisation of sparse matrices is not recommended due to the CSC
  // storage format

  if (out.vec_state == 0) {
    out = strans(expr);

    out.reshape(1, out.n_elem);
  } else {
    SpMat<eT> tmp = strans(expr);

    tmp.reshape(1, tmp.n_elem);

    out.steal_mem(tmp);
  }
}

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

  const uword dim = in.aux_uword_a;

  if (dim == 0) {
    spop_vectorise_col::apply_direct(out, in.m);
  } else {
    spop_vectorise_row::apply_direct(out, in.m);
  }
}

//! @}
