// 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 spglue_relational
//! @{

template <typename T1, typename T2>
inline void spglue_rel_lt::apply(SpMat<uword>& out,
                                 const mtSpGlue<uword, T1, T2, spglue_rel_lt>& X) {
  arma_debug_sigprint();

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

  const bool is_alias = PA.is_alias(out) || PB.is_alias(out);

  if (is_alias == false) {
    spglue_rel_lt::apply_noalias(out, PA, PB);
  } else {
    SpMat<uword> tmp;

    spglue_rel_lt::apply_noalias(tmp, PA, PB);

    out.steal_mem(tmp);
  }
}

template <typename T1, typename T2>
inline void spglue_rel_lt::apply_noalias(SpMat<uword>& out, const SpProxy<T1>& PA,
                                         const SpProxy<T2>& PB) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  arma_conform_assert_same_size(PA.get_n_rows(), PA.get_n_cols(), PB.get_n_rows(),
                                PB.get_n_cols(), "operator<");

  const uword max_n_nonzero = PA.get_n_nonzero() + PB.get_n_nonzero();

  // Resize memory to upper bound
  out.reserve(PA.get_n_rows(), PA.get_n_cols(), max_n_nonzero);

  // Now iterate across both matrices.
  typename SpProxy<T1>::const_iterator_type x_it = PA.begin();
  typename SpProxy<T1>::const_iterator_type x_end = PA.end();

  typename SpProxy<T2>::const_iterator_type y_it = PB.begin();
  typename SpProxy<T2>::const_iterator_type y_end = PB.end();

  uword count = 0;

  while ((x_it != x_end) || (y_it != y_end)) {
    uword out_val;

    const uword x_it_col = x_it.col();
    const uword x_it_row = x_it.row();

    const uword y_it_col = y_it.col();
    const uword y_it_row = y_it.row();

    bool use_y_loc = false;

    if (x_it == y_it) {
      out_val = ((*x_it) < (*y_it)) ? uword(1) : uword(0);

      ++x_it;
      ++y_it;
    } else {
      if ((x_it_col < y_it_col) ||
          ((x_it_col == y_it_col) && (x_it_row < y_it_row)))  // if y is closer to the end
      {
        out_val = ((*x_it) < eT(0)) ? uword(1) : uword(0);

        ++x_it;
      } else {
        out_val = (eT(0) < (*y_it)) ? uword(1) : uword(0);

        ++y_it;

        use_y_loc = true;
      }
    }

    if (out_val != uword(0)) {
      access::rw(out.values[count]) = out_val;

      const uword out_row = (use_y_loc == false) ? x_it_row : y_it_row;
      const uword out_col = (use_y_loc == false) ? x_it_col : y_it_col;

      access::rw(out.row_indices[count]) = out_row;
      access::rw(out.col_ptrs[out_col + 1])++;
      ++count;
    }

    arma_check((count > max_n_nonzero),
               "internal error: spglue_rel_lt::apply_noalias(): count > max_n_nonzero");
  }

  const uword out_n_cols = out.n_cols;

  uword* col_ptrs = access::rwp(out.col_ptrs);

  // Fix column pointers to be cumulative.
  for (uword c = 1; c <= out_n_cols; ++c) {
    col_ptrs[c] += col_ptrs[c - 1];
  }

  if (count < max_n_nonzero) {
    if (count <= (max_n_nonzero / 2)) {
      out.mem_resize(count);
    } else {
      // quick resize without reallocating memory and copying data
      access::rw(out.n_nonzero) = count;
      access::rw(out.values[count]) = eT(0);
      access::rw(out.row_indices[count]) = uword(0);
    }
  }
}

//

template <typename T1, typename T2>
inline void spglue_rel_gt::apply(SpMat<uword>& out,
                                 const mtSpGlue<uword, T1, T2, spglue_rel_gt>& X) {
  arma_debug_sigprint();

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

  const bool is_alias = PA.is_alias(out) || PB.is_alias(out);

  if (is_alias == false) {
    spglue_rel_gt::apply_noalias(out, PA, PB);
  } else {
    SpMat<uword> tmp;

    spglue_rel_gt::apply_noalias(tmp, PA, PB);

    out.steal_mem(tmp);
  }
}

template <typename T1, typename T2>
inline void spglue_rel_gt::apply_noalias(SpMat<uword>& out, const SpProxy<T1>& PA,
                                         const SpProxy<T2>& PB) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  arma_conform_assert_same_size(PA.get_n_rows(), PA.get_n_cols(), PB.get_n_rows(),
                                PB.get_n_cols(), "operator>");

  const uword max_n_nonzero = PA.get_n_nonzero() + PB.get_n_nonzero();

  // Resize memory to upper bound
  out.reserve(PA.get_n_rows(), PA.get_n_cols(), max_n_nonzero);

  // Now iterate across both matrices.
  typename SpProxy<T1>::const_iterator_type x_it = PA.begin();
  typename SpProxy<T1>::const_iterator_type x_end = PA.end();

  typename SpProxy<T2>::const_iterator_type y_it = PB.begin();
  typename SpProxy<T2>::const_iterator_type y_end = PB.end();

  uword count = 0;

  while ((x_it != x_end) || (y_it != y_end)) {
    uword out_val;

    const uword x_it_col = x_it.col();
    const uword x_it_row = x_it.row();

    const uword y_it_col = y_it.col();
    const uword y_it_row = y_it.row();

    bool use_y_loc = false;

    if (x_it == y_it) {
      out_val = ((*x_it) > (*y_it)) ? uword(1) : uword(0);

      ++x_it;
      ++y_it;
    } else {
      if ((x_it_col < y_it_col) ||
          ((x_it_col == y_it_col) && (x_it_row < y_it_row)))  // if y is closer to the end
      {
        out_val = ((*x_it) > eT(0)) ? uword(1) : uword(0);

        ++x_it;
      } else {
        out_val = (eT(0) > (*y_it)) ? uword(1) : uword(0);

        ++y_it;

        use_y_loc = true;
      }
    }

    if (out_val != uword(0)) {
      access::rw(out.values[count]) = out_val;

      const uword out_row = (use_y_loc == false) ? x_it_row : y_it_row;
      const uword out_col = (use_y_loc == false) ? x_it_col : y_it_col;

      access::rw(out.row_indices[count]) = out_row;
      access::rw(out.col_ptrs[out_col + 1])++;
      ++count;
    }

    arma_check((count > max_n_nonzero),
               "internal error: spglue_rel_gt::apply_noalias(): count > max_n_nonzero");
  }

  const uword out_n_cols = out.n_cols;

  uword* col_ptrs = access::rwp(out.col_ptrs);

  // Fix column pointers to be cumulative.
  for (uword c = 1; c <= out_n_cols; ++c) {
    col_ptrs[c] += col_ptrs[c - 1];
  }

  if (count < max_n_nonzero) {
    if (count <= (max_n_nonzero / 2)) {
      out.mem_resize(count);
    } else {
      // quick resize without reallocating memory and copying data
      access::rw(out.n_nonzero) = count;
      access::rw(out.values[count]) = eT(0);
      access::rw(out.row_indices[count]) = uword(0);
    }
  }
}

//

template <typename T1, typename T2>
inline void spglue_rel_and::apply(SpMat<uword>& out,
                                  const mtSpGlue<uword, T1, T2, spglue_rel_and>& X) {
  arma_debug_sigprint();

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

  const bool is_alias = PA.is_alias(out) || PB.is_alias(out);

  if (is_alias == false) {
    spglue_rel_and::apply_noalias(out, PA, PB);
  } else {
    SpMat<uword> tmp;

    spglue_rel_and::apply_noalias(tmp, PA, PB);

    out.steal_mem(tmp);
  }
}

template <typename T1, typename T2>
inline void spglue_rel_and::apply_noalias(SpMat<uword>& out, const SpProxy<T1>& PA,
                                          const SpProxy<T2>& PB) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  arma_conform_assert_same_size(PA.get_n_rows(), PA.get_n_cols(), PB.get_n_rows(),
                                PB.get_n_cols(), "operator&&");

  if ((PA.get_n_nonzero() == 0) || (PB.get_n_nonzero() == 0)) {
    out.zeros(PA.get_n_rows(), PA.get_n_cols());
    return;
  }

  const uword max_n_nonzero = (std::min)(PA.get_n_nonzero(), PB.get_n_nonzero());

  // Resize memory to upper bound
  out.reserve(PA.get_n_rows(), PA.get_n_cols(), max_n_nonzero);

  // Now iterate across both matrices.
  typename SpProxy<T1>::const_iterator_type x_it = PA.begin();
  typename SpProxy<T1>::const_iterator_type x_end = PA.end();

  typename SpProxy<T2>::const_iterator_type y_it = PB.begin();
  typename SpProxy<T2>::const_iterator_type y_end = PB.end();

  uword count = 0;

  while ((x_it != x_end) || (y_it != y_end)) {
    const uword x_it_row = x_it.row();
    const uword x_it_col = x_it.col();

    const uword y_it_row = y_it.row();
    const uword y_it_col = y_it.col();

    if (x_it == y_it) {
      access::rw(out.values[count]) = uword(1);

      access::rw(out.row_indices[count]) = x_it_row;
      access::rw(out.col_ptrs[x_it_col + 1])++;
      ++count;

      ++x_it;
      ++y_it;
    } else {
      if ((x_it_col < y_it_col) ||
          ((x_it_col == y_it_col) && (x_it_row < y_it_row)))  // if y is closer to the end
      {
        ++x_it;
      } else {
        ++y_it;
      }
    }

    arma_check((count > max_n_nonzero),
               "internal error: spglue_rel_and::apply_noalias(): count > max_n_nonzero");
  }

  const uword out_n_cols = out.n_cols;

  uword* col_ptrs = access::rwp(out.col_ptrs);

  // Fix column pointers to be cumulative.
  for (uword c = 1; c <= out_n_cols; ++c) {
    col_ptrs[c] += col_ptrs[c - 1];
  }

  if (count < max_n_nonzero) {
    if (count <= (max_n_nonzero / 2)) {
      out.mem_resize(count);
    } else {
      // quick resize without reallocating memory and copying data
      access::rw(out.n_nonzero) = count;
      access::rw(out.values[count]) = eT(0);
      access::rw(out.row_indices[count]) = uword(0);
    }
  }
}

//

template <typename T1, typename T2>
inline void spglue_rel_or::apply(SpMat<uword>& out,
                                 const mtSpGlue<uword, T1, T2, spglue_rel_or>& X) {
  arma_debug_sigprint();

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

  const bool is_alias = PA.is_alias(out) || PB.is_alias(out);

  if (is_alias == false) {
    spglue_rel_or::apply_noalias(out, PA, PB);
  } else {
    SpMat<uword> tmp;

    spglue_rel_or::apply_noalias(tmp, PA, PB);

    out.steal_mem(tmp);
  }
}

template <typename T1, typename T2>
inline void spglue_rel_or::apply_noalias(SpMat<uword>& out, const SpProxy<T1>& PA,
                                         const SpProxy<T2>& PB) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  arma_conform_assert_same_size(PA.get_n_rows(), PA.get_n_cols(), PB.get_n_rows(),
                                PB.get_n_cols(), "operator||");

  const uword max_n_nonzero = PA.get_n_nonzero() + PB.get_n_nonzero();

  // Resize memory to upper bound
  out.reserve(PA.get_n_rows(), PA.get_n_cols(), max_n_nonzero);

  // Now iterate across both matrices.
  typename SpProxy<T1>::const_iterator_type x_it = PA.begin();
  typename SpProxy<T1>::const_iterator_type x_end = PA.end();

  typename SpProxy<T2>::const_iterator_type y_it = PB.begin();
  typename SpProxy<T2>::const_iterator_type y_end = PB.end();

  uword count = 0;

  while ((x_it != x_end) || (y_it != y_end)) {
    const uword x_it_col = x_it.col();
    const uword x_it_row = x_it.row();

    const uword y_it_col = y_it.col();
    const uword y_it_row = y_it.row();

    bool use_y_loc = false;

    if (x_it == y_it) {
      ++x_it;
      ++y_it;
    } else {
      if ((x_it_col < y_it_col) ||
          ((x_it_col == y_it_col) && (x_it_row < y_it_row)))  // if y is closer to the end
      {
        ++x_it;
      } else {
        ++y_it;

        use_y_loc = true;
      }
    }

    access::rw(out.values[count]) = uword(1);

    const uword out_row = (use_y_loc == false) ? x_it_row : y_it_row;
    const uword out_col = (use_y_loc == false) ? x_it_col : y_it_col;

    access::rw(out.row_indices[count]) = out_row;
    access::rw(out.col_ptrs[out_col + 1])++;
    ++count;

    arma_check((count > max_n_nonzero),
               "internal error: spglue_rel_or::apply_noalias(): count > max_n_nonzero");
  }

  const uword out_n_cols = out.n_cols;

  uword* col_ptrs = access::rwp(out.col_ptrs);

  // Fix column pointers to be cumulative.
  for (uword c = 1; c <= out_n_cols; ++c) {
    col_ptrs[c] += col_ptrs[c - 1];
  }

  if (count < max_n_nonzero) {
    if (count <= (max_n_nonzero / 2)) {
      out.mem_resize(count);
    } else {
      // quick resize without reallocating memory and copying data
      access::rw(out.n_nonzero) = count;
      access::rw(out.values[count]) = eT(0);
      access::rw(out.row_indices[count]) = uword(0);
    }
  }
}

//! @}
