// 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_repmat
//! @{

template <typename obj>
inline void op_repmat::apply_noalias(Mat<typename obj::elem_type>& out, const obj& X,
                                     const uword copies_per_row,
                                     const uword copies_per_col) {
  arma_debug_sigprint();

  typedef typename obj::elem_type eT;

  const uword X_n_rows = obj::is_row ? uword(1) : X.n_rows;
  const uword X_n_cols = obj::is_col ? uword(1) : X.n_cols;

  out.set_size(X_n_rows * copies_per_row, X_n_cols * copies_per_col);

  const uword out_n_rows = out.n_rows;
  const uword out_n_cols = out.n_cols;

  // if( (out_n_rows > 0) && (out_n_cols > 0) )
  //   {
  //   for(uword col = 0; col < out_n_cols; col += X_n_cols)
  //   for(uword row = 0; row < out_n_rows; row += X_n_rows)
  //     {
  //     out.submat(row, col, row+X_n_rows-1, col+X_n_cols-1) = X;
  //     }
  //   }

  if ((out_n_rows > 0) && (out_n_cols > 0)) {
    if (copies_per_row != 1) {
      for (uword col_copy = 0; col_copy < copies_per_col; ++col_copy) {
        const uword out_col_offset = X_n_cols * col_copy;

        for (uword col = 0; col < X_n_cols; ++col) {
          eT* out_colptr = out.colptr(col + out_col_offset);
          const eT* X_colptr = X.colptr(col);

          for (uword row_copy = 0; row_copy < copies_per_row; ++row_copy) {
            const uword out_row_offset = X_n_rows * row_copy;

            arrayops::copy(&out_colptr[out_row_offset], X_colptr, X_n_rows);
          }
        }
      }
    } else {
      for (uword col_copy = 0; col_copy < copies_per_col; ++col_copy) {
        const uword out_col_offset = X_n_cols * col_copy;

        for (uword col = 0; col < X_n_cols; ++col) {
          eT* out_colptr = out.colptr(col + out_col_offset);
          const eT* X_colptr = X.colptr(col);

          arrayops::copy(out_colptr, X_colptr, X_n_rows);
        }
      }
    }
  }
}

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

  typedef typename T1::elem_type eT;

  const uword copies_per_row = in.aux_uword_a;
  const uword copies_per_col = in.aux_uword_b;

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

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

    op_repmat::apply_noalias(tmp, U.M, copies_per_row, copies_per_col);

    out.steal_mem(tmp);
  } else {
    op_repmat::apply_noalias(out, U.M, copies_per_row, copies_per_col);
  }
}

//! @}
