// 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 glue_min
//! @{

template <typename T1, typename T2>
inline void glue_min::apply(Mat<typename T1::elem_type>& out,
                            const Glue<T1, T2, glue_min>& X) {
  arma_extra_debug_sigprint();

  typedef typename T1::elem_type eT;

  const Proxy<T1> PA(X.A);
  const Proxy<T2> PB(X.B);

  if ((PA.is_alias(out) && PA.has_subview) || (PB.is_alias(out) && PB.has_subview)) {
    Mat<eT> tmp;

    glue_min::apply(tmp, PA, PB);

    out.steal_mem(tmp);
  } else {
    glue_min::apply(out, PA, PB);
  }
}

template <typename eT, typename T1, typename T2>
inline void glue_min::apply(Mat<eT>& out, const Proxy<T1>& PA, const Proxy<T2>& PB) {
  arma_extra_debug_sigprint();

  const uword n_rows = PA.get_n_rows();
  const uword n_cols = PA.get_n_cols();

  arma_debug_assert_same_size(n_rows, n_cols, PB.get_n_rows(), PB.get_n_cols(),
                              "element-wise min()");

  const arma_lt_comparator<eT> comparator;

  out.set_size(n_rows, n_cols);

  eT* out_mem = out.memptr();

  if ((Proxy<T1>::use_at == false) && (Proxy<T2>::use_at == false)) {
    typename Proxy<T1>::ea_type A = PA.get_ea();
    typename Proxy<T2>::ea_type B = PB.get_ea();

    const uword N = PA.get_n_elem();

    for (uword i = 0; i < N; ++i) {
      const eT Ai = A[i];
      const eT Bi = B[i];

      out_mem[i] = comparator(Ai, Bi) ? Ai : Bi;
    }
  } else {
    for (uword col = 0; col < n_cols; ++col)
      for (uword row = 0; row < n_rows; ++row) {
        const eT Ai = PA.at(row, col);
        const eT Bi = PB.at(row, col);

        *out_mem = comparator(Ai, Bi) ? Ai : Bi;

        ++out_mem;
      }
  }
}

template <typename T1, typename T2>
inline void glue_min::apply(Cube<typename T1::elem_type>& out,
                            const GlueCube<T1, T2, glue_min>& X) {
  arma_extra_debug_sigprint();

  typedef typename T1::elem_type eT;

  const ProxyCube<T1> PA(X.A);
  const ProxyCube<T2> PB(X.B);

  if ((PA.is_alias(out) && PA.has_subview) || (PB.is_alias(out) && PB.has_subview)) {
    Cube<eT> tmp;

    glue_min::apply(tmp, PA, PB);

    out.steal_mem(tmp);
  } else {
    glue_min::apply(out, PA, PB);
  }
}

template <typename eT, typename T1, typename T2>
inline void glue_min::apply(Cube<eT>& out, const ProxyCube<T1>& PA,
                            const ProxyCube<T2>& PB) {
  arma_extra_debug_sigprint();

  const uword n_rows = PA.get_n_rows();
  const uword n_cols = PA.get_n_cols();
  const uword n_slices = PA.get_n_slices();

  arma_debug_assert_same_size(n_rows, n_cols, n_slices, PB.get_n_rows(), PB.get_n_cols(),
                              PB.get_n_slices(), "element-wise min()");

  const arma_lt_comparator<eT> comparator;

  out.set_size(n_rows, n_cols, n_slices);

  eT* out_mem = out.memptr();

  if ((ProxyCube<T1>::use_at == false) && (ProxyCube<T2>::use_at == false)) {
    typename ProxyCube<T1>::ea_type A = PA.get_ea();
    typename ProxyCube<T2>::ea_type B = PB.get_ea();

    const uword N = PA.get_n_elem();

    for (uword i = 0; i < N; ++i) {
      const eT Ai = A[i];
      const eT Bi = B[i];

      out_mem[i] = comparator(Ai, Bi) ? Ai : Bi;
    }
  } else {
    for (uword slice = 0; slice < n_slices; ++slice)
      for (uword col = 0; col < n_cols; ++col)
        for (uword row = 0; row < n_rows; ++row) {
          const eT Ai = PA.at(row, col, slice);
          const eT Bi = PB.at(row, col, slice);

          *out_mem = comparator(Ai, Bi) ? Ai : Bi;

          ++out_mem;
        }
  }
}

//! @}
