// 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 op_reverse
//! @{

template <typename T1>
inline void op_reverse::apply(Mat<typename T1::elem_type>& out,
                              const Op<T1, op_reverse>& in) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  const uword dim = in.aux_uword_a;

  arma_conform_check((dim > 1), "reverse(): parameter 'dim' must be 0 or 1");

  if (is_Mat<T1>::value) {
    // allow detection of in-place operation

    const unwrap<T1> U(in.m);

    if (dim == 0) {
      op_flipud::apply_direct(out, U.M);
    }
    if (dim == 1) {
      op_fliplr::apply_direct(out, U.M);
    }
  } else {
    const Proxy<T1> P(in.m);

    if (P.is_alias(out)) {
      Mat<eT> tmp;

      if (dim == 0) {
        op_flipud::apply_proxy_noalias(tmp, P);
      }
      if (dim == 1) {
        op_fliplr::apply_proxy_noalias(tmp, P);
      }

      out.steal_mem(tmp);
    } else {
      if (dim == 0) {
        op_flipud::apply_proxy_noalias(out, P);
      }
      if (dim == 1) {
        op_fliplr::apply_proxy_noalias(out, P);
      }
    }
  }
}

template <typename T1>
inline void op_reverse_vec::apply(Mat<typename T1::elem_type>& out,
                                  const Op<T1, op_reverse_vec>& in) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  if (is_Mat<T1>::value) {
    // allow detection of in-place operation

    const unwrap<T1> U(in.m);

    if ((T1::is_xvec) ? bool(U.M.is_rowvec()) : bool(T1::is_row)) {
      op_fliplr::apply_direct(out, U.M);
    } else {
      op_flipud::apply_direct(out, U.M);
    }
  } else {
    const Proxy<T1> P(in.m);

    if (P.is_alias(out)) {
      Mat<eT> tmp;

      if ((T1::is_xvec) ? bool(P.get_n_rows() == 1) : bool(T1::is_row)) {
        op_fliplr::apply_proxy_noalias(tmp, P);
      } else {
        op_flipud::apply_proxy_noalias(tmp, P);
      }

      out.steal_mem(tmp);
    } else {
      if ((T1::is_xvec) ? bool(P.get_n_rows() == 1) : bool(T1::is_row)) {
        op_fliplr::apply_proxy_noalias(out, P);
      } else {
        op_flipud::apply_proxy_noalias(out, P);
      }
    }
  }
}

//! @}
