// 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_join
//! @{

template <typename T1, typename T2>
inline void glue_join_cols::apply_noalias(Mat<typename T1::elem_type>& out,
                                          const Proxy<T1>& A, const Proxy<T2>& B) {
  arma_extra_debug_sigprint();

  const uword A_n_rows = A.get_n_rows();
  const uword A_n_cols = A.get_n_cols();

  const uword B_n_rows = B.get_n_rows();
  const uword B_n_cols = B.get_n_cols();

  arma_debug_check(((A_n_cols != B_n_cols) && ((A_n_rows > 0) || (A_n_cols > 0)) &&
                    ((B_n_rows > 0) || (B_n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");

  out.set_size(A_n_rows + B_n_rows, (std::max)(A_n_cols, B_n_cols));

  if (out.n_elem > 0) {
    if (A.get_n_elem() > 0) {
      out.submat(0, 0, A_n_rows - 1, out.n_cols - 1) = A.Q;
    }

    if (B.get_n_elem() > 0) {
      out.submat(A_n_rows, 0, out.n_rows - 1, out.n_cols - 1) = B.Q;
    }
  }
}

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

  typedef typename T1::elem_type eT;

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

  if ((A.is_alias(out) == false) && (B.is_alias(out) == false)) {
    glue_join_cols::apply_noalias(out, A, B);
  } else {
    Mat<eT> tmp;

    glue_join_cols::apply_noalias(tmp, A, B);

    out.steal_mem(tmp);
  }
}

template <typename eT, typename T1, typename T2, typename T3>
inline void glue_join_cols::apply(Mat<eT>& out, const Base<eT, T1>& A_expr,
                                  const Base<eT, T2>& B_expr,
                                  const Base<eT, T3>& C_expr) {
  arma_extra_debug_sigprint();

  const quasi_unwrap<T1> UA(A_expr.get_ref());
  const quasi_unwrap<T2> UB(B_expr.get_ref());
  const quasi_unwrap<T3> UC(C_expr.get_ref());

  const Mat<eT>& A = UA.M;
  const Mat<eT>& B = UB.M;
  const Mat<eT>& C = UC.M;

  const uword out_n_rows = A.n_rows + B.n_rows + C.n_rows;
  const uword out_n_cols = (std::max)((std::max)(A.n_cols, B.n_cols), C.n_cols);

  arma_debug_check(((A.n_cols != out_n_cols) && ((A.n_rows > 0) || (A.n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");
  arma_debug_check(((B.n_cols != out_n_cols) && ((B.n_rows > 0) || (B.n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");
  arma_debug_check(((C.n_cols != out_n_cols) && ((C.n_rows > 0) || (C.n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");

  out.set_size(out_n_rows, out_n_cols);

  if (out.n_elem == 0) {
    return;
  }

  uword row_start = 0;
  uword row_end_p1 = 0;

  if (A.n_elem > 0) {
    row_end_p1 += A.n_rows;
    out.rows(row_start, row_end_p1 - 1) = A;
  }

  row_start = row_end_p1;

  if (B.n_elem > 0) {
    row_end_p1 += B.n_rows;
    out.rows(row_start, row_end_p1 - 1) = B;
  }

  row_start = row_end_p1;

  if (C.n_elem > 0) {
    row_end_p1 += C.n_rows;
    out.rows(row_start, row_end_p1 - 1) = C;
  }
}

template <typename eT, typename T1, typename T2, typename T3, typename T4>
inline void glue_join_cols::apply(Mat<eT>& out, const Base<eT, T1>& A_expr,
                                  const Base<eT, T2>& B_expr, const Base<eT, T3>& C_expr,
                                  const Base<eT, T4>& D_expr) {
  arma_extra_debug_sigprint();

  const quasi_unwrap<T1> UA(A_expr.get_ref());
  const quasi_unwrap<T2> UB(B_expr.get_ref());
  const quasi_unwrap<T3> UC(C_expr.get_ref());
  const quasi_unwrap<T4> UD(D_expr.get_ref());

  const Mat<eT>& A = UA.M;
  const Mat<eT>& B = UB.M;
  const Mat<eT>& C = UC.M;
  const Mat<eT>& D = UD.M;

  const uword out_n_rows = A.n_rows + B.n_rows + C.n_rows + D.n_rows;
  const uword out_n_cols =
      (std::max)(((std::max)((std::max)(A.n_cols, B.n_cols), C.n_cols)), D.n_cols);

  arma_debug_check(((A.n_cols != out_n_cols) && ((A.n_rows > 0) || (A.n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");
  arma_debug_check(((B.n_cols != out_n_cols) && ((B.n_rows > 0) || (B.n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");
  arma_debug_check(((C.n_cols != out_n_cols) && ((C.n_rows > 0) || (C.n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");
  arma_debug_check(((D.n_cols != out_n_cols) && ((D.n_rows > 0) || (D.n_cols > 0))),
                   "join_cols() / join_vert(): number of columns must be the same");

  out.set_size(out_n_rows, out_n_cols);

  if (out.n_elem == 0) {
    return;
  }

  uword row_start = 0;
  uword row_end_p1 = 0;

  if (A.n_elem > 0) {
    row_end_p1 += A.n_rows;
    out.rows(row_start, row_end_p1 - 1) = A;
  }

  row_start = row_end_p1;

  if (B.n_elem > 0) {
    row_end_p1 += B.n_rows;
    out.rows(row_start, row_end_p1 - 1) = B;
  }

  row_start = row_end_p1;

  if (C.n_elem > 0) {
    row_end_p1 += C.n_rows;
    out.rows(row_start, row_end_p1 - 1) = C;
  }

  row_start = row_end_p1;

  if (D.n_elem > 0) {
    row_end_p1 += D.n_rows;
    out.rows(row_start, row_end_p1 - 1) = D;
  }
}

template <typename T1, typename T2>
inline void glue_join_rows::apply_noalias(Mat<typename T1::elem_type>& out,
                                          const Proxy<T1>& A, const Proxy<T2>& B) {
  arma_extra_debug_sigprint();

  const uword A_n_rows = A.get_n_rows();
  const uword A_n_cols = A.get_n_cols();

  const uword B_n_rows = B.get_n_rows();
  const uword B_n_cols = B.get_n_cols();

  arma_debug_check(((A_n_rows != B_n_rows) && ((A_n_rows > 0) || (A_n_cols > 0)) &&
                    ((B_n_rows > 0) || (B_n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");

  out.set_size((std::max)(A_n_rows, B_n_rows), A_n_cols + B_n_cols);

  if (out.n_elem > 0) {
    if (A.get_n_elem() > 0) {
      out.submat(0, 0, out.n_rows - 1, A_n_cols - 1) = A.Q;
    }

    if (B.get_n_elem() > 0) {
      out.submat(0, A_n_cols, out.n_rows - 1, out.n_cols - 1) = B.Q;
    }
  }
}

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

  typedef typename T1::elem_type eT;

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

  if ((A.is_alias(out) == false) && (B.is_alias(out) == false)) {
    glue_join_rows::apply_noalias(out, A, B);
  } else {
    Mat<eT> tmp;

    glue_join_rows::apply_noalias(tmp, A, B);

    out.steal_mem(tmp);
  }
}

template <typename eT, typename T1, typename T2, typename T3>
inline void glue_join_rows::apply(Mat<eT>& out, const Base<eT, T1>& A_expr,
                                  const Base<eT, T2>& B_expr,
                                  const Base<eT, T3>& C_expr) {
  arma_extra_debug_sigprint();

  const quasi_unwrap<T1> UA(A_expr.get_ref());
  const quasi_unwrap<T2> UB(B_expr.get_ref());
  const quasi_unwrap<T3> UC(C_expr.get_ref());

  const Mat<eT>& A = UA.M;
  const Mat<eT>& B = UB.M;
  const Mat<eT>& C = UC.M;

  const uword out_n_rows = (std::max)((std::max)(A.n_rows, B.n_rows), C.n_rows);
  const uword out_n_cols = A.n_cols + B.n_cols + C.n_cols;

  arma_debug_check(((A.n_rows != out_n_rows) && ((A.n_rows > 0) || (A.n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");
  arma_debug_check(((B.n_rows != out_n_rows) && ((B.n_rows > 0) || (B.n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");
  arma_debug_check(((C.n_rows != out_n_rows) && ((C.n_rows > 0) || (C.n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");

  out.set_size(out_n_rows, out_n_cols);

  if (out.n_elem == 0) {
    return;
  }

  uword col_start = 0;
  uword col_end_p1 = 0;

  if (A.n_elem > 0) {
    col_end_p1 += A.n_cols;
    out.cols(col_start, col_end_p1 - 1) = A;
  }

  col_start = col_end_p1;

  if (B.n_elem > 0) {
    col_end_p1 += B.n_cols;
    out.cols(col_start, col_end_p1 - 1) = B;
  }

  col_start = col_end_p1;

  if (C.n_elem > 0) {
    col_end_p1 += C.n_cols;
    out.cols(col_start, col_end_p1 - 1) = C;
  }
}

template <typename eT, typename T1, typename T2, typename T3, typename T4>
inline void glue_join_rows::apply(Mat<eT>& out, const Base<eT, T1>& A_expr,
                                  const Base<eT, T2>& B_expr, const Base<eT, T3>& C_expr,
                                  const Base<eT, T4>& D_expr) {
  arma_extra_debug_sigprint();

  const quasi_unwrap<T1> UA(A_expr.get_ref());
  const quasi_unwrap<T2> UB(B_expr.get_ref());
  const quasi_unwrap<T3> UC(C_expr.get_ref());
  const quasi_unwrap<T4> UD(D_expr.get_ref());

  const Mat<eT>& A = UA.M;
  const Mat<eT>& B = UB.M;
  const Mat<eT>& C = UC.M;
  const Mat<eT>& D = UD.M;

  const uword out_n_rows =
      (std::max)(((std::max)((std::max)(A.n_rows, B.n_rows), C.n_rows)), D.n_rows);
  const uword out_n_cols = A.n_cols + B.n_cols + C.n_cols + D.n_cols;

  arma_debug_check(((A.n_rows != out_n_rows) && ((A.n_rows > 0) || (A.n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");
  arma_debug_check(((B.n_rows != out_n_rows) && ((B.n_rows > 0) || (B.n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");
  arma_debug_check(((C.n_rows != out_n_rows) && ((C.n_rows > 0) || (C.n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");
  arma_debug_check(((D.n_rows != out_n_rows) && ((D.n_rows > 0) || (D.n_cols > 0))),
                   "join_rows() / join_horiz(): number of rows must be the same");

  out.set_size(out_n_rows, out_n_cols);

  if (out.n_elem == 0) {
    return;
  }

  uword col_start = 0;
  uword col_end_p1 = 0;

  if (A.n_elem > 0) {
    col_end_p1 += A.n_cols;
    out.cols(col_start, col_end_p1 - 1) = A;
  }

  col_start = col_end_p1;

  if (B.n_elem > 0) {
    col_end_p1 += B.n_cols;
    out.cols(col_start, col_end_p1 - 1) = B;
  }

  col_start = col_end_p1;

  if (C.n_elem > 0) {
    col_end_p1 += C.n_cols;
    out.cols(col_start, col_end_p1 - 1) = C;
  }

  col_start = col_end_p1;

  if (D.n_elem > 0) {
    col_end_p1 += D.n_cols;
    out.cols(col_start, col_end_p1 - 1) = D;
  }
}

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

  typedef typename T1::elem_type eT;

  const unwrap_cube<T1> A_tmp(X.A);
  const unwrap_cube<T2> B_tmp(X.B);

  const Cube<eT>& A = A_tmp.M;
  const Cube<eT>& B = B_tmp.M;

  if (A.n_elem == 0) {
    out = B;
    return;
  }
  if (B.n_elem == 0) {
    out = A;
    return;
  }

  arma_debug_check(((A.n_rows != B.n_rows) || (A.n_cols != B.n_cols)),
                   "join_slices(): size of slices must be the same");

  if ((&out != &A) && (&out != &B)) {
    out.set_size(A.n_rows, A.n_cols, A.n_slices + B.n_slices);

    out.slices(0, A.n_slices - 1) = A;
    out.slices(A.n_slices, out.n_slices - 1) = B;
  } else  // we have aliasing
  {
    Cube<eT> C(A.n_rows, A.n_cols, A.n_slices + B.n_slices, arma_nozeros_indicator());

    C.slices(0, A.n_slices - 1) = A;
    C.slices(A.n_slices, C.n_slices - 1) = B;

    out.steal_mem(C);
  }
}

//! @}
