// 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_resize
//! @{

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

  typedef typename T1::elem_type eT;

  const uword new_n_rows = in.aux_uword_a;
  const uword new_n_cols = in.aux_uword_b;

  const unwrap<T1> tmp(in.m);
  const Mat<eT>& A = tmp.M;

  if (&out == &A) {
    op_resize::apply_mat_inplace(out, new_n_rows, new_n_cols);
  } else {
    op_resize::apply_mat_noalias(out, A, new_n_rows, new_n_cols);
  }
}

template <typename eT>
inline void op_resize::apply_mat_inplace(Mat<eT>& A, const uword new_n_rows,
                                         const uword new_n_cols) {
  arma_debug_sigprint();

  if ((A.n_rows == new_n_rows) && (A.n_cols == new_n_cols)) {
    return;
  }

  arma_conform_check(
      (A.vec_state == 1) && (new_n_cols != 1),
      "resize(): requested size is not compatible with column vector layout");
  arma_conform_check((A.vec_state == 2) && (new_n_rows != 1),
                     "resize(): requested size is not compatible with row vector layout");

  if (A.is_empty()) {
    A.zeros(new_n_rows, new_n_cols);
    return;
  }

  Mat<eT> B;

  op_resize::apply_mat_noalias(B, A, new_n_rows, new_n_cols);

  A.steal_mem(B);
}

template <typename eT>
inline void op_resize::apply_mat_noalias(Mat<eT>& out, const Mat<eT>& A,
                                         const uword new_n_rows, const uword new_n_cols) {
  arma_debug_sigprint();

  out.set_size(new_n_rows, new_n_cols);

  if ((new_n_rows > A.n_rows) || (new_n_cols > A.n_cols)) {
    out.zeros();
  }

  if ((out.n_elem > 0) && (A.n_elem > 0)) {
    const uword end_row = (std::min)(new_n_rows, A.n_rows) - 1;
    const uword end_col = (std::min)(new_n_cols, A.n_cols) - 1;

    out.submat(0, 0, end_row, end_col) = A.submat(0, 0, end_row, end_col);
  }
}

//

template <typename T1>
inline void op_resize::apply(Cube<typename T1::elem_type>& out,
                             const OpCube<T1, op_resize>& in) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  const uword new_n_rows = in.aux_uword_a;
  const uword new_n_cols = in.aux_uword_b;
  const uword new_n_slices = in.aux_uword_c;

  const unwrap_cube<T1> tmp(in.m);
  const Cube<eT>& A = tmp.M;

  if (&out == &A) {
    op_resize::apply_cube_inplace(out, new_n_rows, new_n_cols, new_n_slices);
  } else {
    op_resize::apply_cube_noalias(out, A, new_n_rows, new_n_cols, new_n_slices);
  }
}

template <typename eT>
inline void op_resize::apply_cube_inplace(Cube<eT>& A, const uword new_n_rows,
                                          const uword new_n_cols,
                                          const uword new_n_slices) {
  arma_debug_sigprint();

  if ((A.n_rows == new_n_rows) && (A.n_cols == new_n_cols) &&
      (A.n_slices == new_n_slices)) {
    return;
  }

  if (A.is_empty()) {
    A.zeros(new_n_rows, new_n_cols, new_n_slices);
    return;
  }

  Cube<eT> B;

  op_resize::apply_cube_noalias(B, A, new_n_rows, new_n_cols, new_n_slices);

  A.steal_mem(B);
}

template <typename eT>
inline void op_resize::apply_cube_noalias(Cube<eT>& out, const Cube<eT>& A,
                                          const uword new_n_rows, const uword new_n_cols,
                                          const uword new_n_slices) {
  arma_debug_sigprint();

  out.set_size(new_n_rows, new_n_cols, new_n_slices);

  if ((new_n_rows > A.n_rows) || (new_n_cols > A.n_cols) || (new_n_slices > A.n_slices)) {
    out.zeros();
  }

  if ((out.n_elem > 0) && (A.n_elem > 0)) {
    const uword end_row = (std::min)(new_n_rows, A.n_rows) - 1;
    const uword end_col = (std::min)(new_n_cols, A.n_cols) - 1;
    const uword end_slice = (std::min)(new_n_slices, A.n_slices) - 1;

    out.subcube(0, 0, 0, end_row, end_col, end_slice) =
        A.subcube(0, 0, 0, end_row, end_col, end_slice);
  }
}

//! @}
