// 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_powext
//! @{

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

  typedef typename T1::elem_type eT;

  const quasi_unwrap<T1> UA(X.A);
  const quasi_unwrap<T2> UB(X.B);

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

  arma_conform_assert_same_size(A, B, "element-wise pow()");

  const bool UA_bad_alias =
      UA.is_alias(out) && (UA.has_subview);  // allow inplace operation
  const bool UB_bad_alias = UB.is_alias(out);

  if (UA_bad_alias || UB_bad_alias) {
    Mat<eT> tmp;

    glue_powext::apply(tmp, A, B);

    out.steal_mem(tmp);
  } else {
    glue_powext::apply(out, A, B);
  }
}

template <typename eT>
inline void glue_powext::apply(Mat<eT>& out, const Mat<eT>& A, const Mat<eT>& B) {
  arma_debug_sigprint();

  out.set_size(A.n_rows, A.n_cols);

  const uword N = out.n_elem;

  eT* out_mem = out.memptr();
  const eT* A_mem = A.memptr();
  const eT* B_mem = B.memptr();

  if (arma_config::openmp && mp_gate<eT>::eval(N)) {
#if defined(ARMA_USE_OPENMP)
    {
      const int n_threads = mp_thread_limit::get();

#pragma omp parallel for schedule(static) num_threads(n_threads)
      for (uword i = 0; i < N; ++i) {
        out_mem[i] = eop_aux::pow(A_mem[i], B_mem[i]);
      }
    }
#endif
  } else {
    for (uword i = 0; i < N; ++i) {
      out_mem[i] = eop_aux::pow(A_mem[i], B_mem[i]);
    }
  }
}

template <typename parent, unsigned int mode, typename T2>
inline Mat<typename parent::elem_type> glue_powext::apply(
    const subview_each1<parent, mode>& X, const Base<typename parent::elem_type, T2>& Y) {
  arma_debug_sigprint();

  typedef typename parent::elem_type eT;

  const parent& A = X.P;

  const uword A_n_rows = A.n_rows;
  const uword A_n_cols = A.n_cols;

  Mat<eT> out(A_n_rows, A_n_cols, arma_nozeros_indicator());

  const quasi_unwrap<T2> tmp(Y.get_ref());
  const Mat<eT>& B = tmp.M;

  X.check_size(B);

  const eT* B_mem = B.memptr();

  if (mode == 0)  // each column
  {
    if (arma_config::openmp && mp_gate<eT>::eval(A.n_elem)) {
#if defined(ARMA_USE_OPENMP)
      {
        const int n_threads = int((std::min)(uword(mp_thread_limit::get()), A_n_cols));

#pragma omp parallel for schedule(static) num_threads(n_threads)
        for (uword i = 0; i < A_n_cols; ++i) {
          const eT* A_mem = A.colptr(i);
          eT* out_mem = out.colptr(i);

          for (uword row = 0; row < A_n_rows; ++row) {
            out_mem[row] = eop_aux::pow(A_mem[row], B_mem[row]);
          }
        }
      }
#endif
    } else {
      for (uword i = 0; i < A_n_cols; ++i) {
        const eT* A_mem = A.colptr(i);
        eT* out_mem = out.colptr(i);

        for (uword row = 0; row < A_n_rows; ++row) {
          out_mem[row] = eop_aux::pow(A_mem[row], B_mem[row]);
        }
      }
    }
  }

  if (mode == 1)  // each row
  {
    if (arma_config::openmp && mp_gate<eT>::eval(A.n_elem)) {
#if defined(ARMA_USE_OPENMP)
      {
        const int n_threads = int((std::min)(uword(mp_thread_limit::get()), A_n_cols));

#pragma omp parallel for schedule(static) num_threads(n_threads)
        for (uword i = 0; i < A_n_cols; ++i) {
          const eT* A_mem = A.colptr(i);
          eT* out_mem = out.colptr(i);

          const eT B_val = B_mem[i];

          for (uword row = 0; row < A_n_rows; ++row) {
            out_mem[row] = eop_aux::pow(A_mem[row], B_val);
          }
        }
      }
#endif
    } else {
      for (uword i = 0; i < A_n_cols; ++i) {
        const eT* A_mem = A.colptr(i);
        eT* out_mem = out.colptr(i);

        const eT B_val = B_mem[i];

        for (uword row = 0; row < A_n_rows; ++row) {
          out_mem[row] = eop_aux::pow(A_mem[row], B_val);
        }
      }
    }
  }

  return out;
}

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

  typedef typename T1::elem_type eT;

  const unwrap_cube<T1> UA(X.A);
  const unwrap_cube<T2> UB(X.B);

  const Cube<eT>& A = UA.M;
  const Cube<eT>& B = UB.M;

  arma_conform_assert_same_size(A, B, "element-wise pow()");

  if (UB.is_alias(out)) {
    Cube<eT> tmp;

    glue_powext::apply(tmp, A, B);

    out.steal_mem(tmp);
  } else {
    glue_powext::apply(out, A, B);
  }
}

template <typename eT>
inline void glue_powext::apply(Cube<eT>& out, const Cube<eT>& A, const Cube<eT>& B) {
  arma_debug_sigprint();

  out.set_size(A.n_rows, A.n_cols, A.n_slices);

  const uword N = out.n_elem;

  eT* out_mem = out.memptr();
  const eT* A_mem = A.memptr();
  const eT* B_mem = B.memptr();

  if (arma_config::openmp && mp_gate<eT>::eval(N)) {
#if defined(ARMA_USE_OPENMP)
    {
      const int n_threads = mp_thread_limit::get();

#pragma omp parallel for schedule(static) num_threads(n_threads)
      for (uword i = 0; i < N; ++i) {
        out_mem[i] = eop_aux::pow(A_mem[i], B_mem[i]);
      }
    }
#endif
  } else {
    for (uword i = 0; i < N; ++i) {
      out_mem[i] = eop_aux::pow(A_mem[i], B_mem[i]);
    }
  }
}

template <typename eT, typename T2>
inline Cube<eT> glue_powext::apply(const subview_cube_each1<eT>& X,
                                   const Base<eT, T2>& Y) {
  arma_debug_sigprint();

  const Cube<eT>& A = X.P;

  const uword A_n_rows = A.n_rows;
  const uword A_n_cols = A.n_cols;
  const uword A_n_slices = A.n_slices;

  Cube<eT> out(A_n_rows, A_n_cols, A_n_slices, arma_nozeros_indicator());

  const quasi_unwrap<T2> tmp(Y.get_ref());
  const Mat<eT>& B = tmp.M;

  X.check_size(B);

  const eT* B_mem = B.memptr();
  const uword B_n_elem = B.n_elem;

  if (arma_config::openmp && mp_gate<eT>::eval(A.n_elem)) {
#if defined(ARMA_USE_OPENMP)
    {
      const int n_threads = int((std::min)(uword(mp_thread_limit::get()), A_n_slices));

#pragma omp parallel for schedule(static) num_threads(n_threads)
      for (uword s = 0; s < A_n_slices; ++s) {
        const eT* A_slice_mem = A.slice_memptr(s);
        eT* out_slice_mem = out.slice_memptr(s);

        for (uword i = 0; i < B_n_elem; ++i) {
          out_slice_mem[i] = eop_aux::pow(A_slice_mem[i], B_mem[i]);
        }
      }
    }
#endif
  } else {
    for (uword s = 0; s < A_n_slices; ++s) {
      const eT* A_slice_mem = A.slice_memptr(s);
      eT* out_slice_mem = out.slice_memptr(s);

      for (uword i = 0; i < B_n_elem; ++i) {
        out_slice_mem[i] = eop_aux::pow(A_slice_mem[i], B_mem[i]);
      }
    }
  }

  return out;
}

//

template <typename T1, typename T2>
inline void glue_powext_cx::apply(
    Mat<typename T1::elem_type>& out,
    const mtGlue<typename T1::elem_type, T1, T2, glue_powext_cx>& X) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;
  typedef typename T1::pod_type T;

  const quasi_unwrap<T1> UA(X.A);
  const quasi_unwrap<T2> UB(X.B);

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

  arma_conform_assert_same_size(A, B, "element-wise pow()");

  if (UA.is_alias(out) && (UA.has_subview)) {
    Mat<eT> tmp;

    glue_powext_cx::apply(tmp, A, B);

    out.steal_mem(tmp);
  } else {
    glue_powext_cx::apply(out, A, B);
  }
}

template <typename T>
inline void glue_powext_cx::apply(Mat<std::complex<T> >& out,
                                  const Mat<std::complex<T> >& A, const Mat<T>& B) {
  arma_debug_sigprint();

  typedef typename std::complex<T> eT;

  out.set_size(A.n_rows, A.n_cols);

  const uword N = out.n_elem;

  eT* out_mem = out.memptr();
  const eT* A_mem = A.memptr();
  const T* B_mem = B.memptr();

  if (arma_config::openmp && mp_gate<eT>::eval(N)) {
#if defined(ARMA_USE_OPENMP)
    {
      const int n_threads = mp_thread_limit::get();

#pragma omp parallel for schedule(static) num_threads(n_threads)
      for (uword i = 0; i < N; ++i) {
        out_mem[i] = std::pow(A_mem[i], B_mem[i]);
      }
    }
#endif
  } else {
    for (uword i = 0; i < N; ++i) {
      out_mem[i] = std::pow(A_mem[i], B_mem[i]);
    }
  }
}

template <typename parent, unsigned int mode, typename T2>
inline Mat<typename parent::elem_type> glue_powext_cx::apply(
    const subview_each1<parent, mode>& X, const Base<typename T2::elem_type, T2>& Y) {
  arma_debug_sigprint();

  typedef typename parent::elem_type eT;
  typedef typename parent::pod_type T;

  const parent& A = X.P;

  const uword A_n_rows = A.n_rows;
  const uword A_n_cols = A.n_cols;

  Mat<eT> out(A_n_rows, A_n_cols, arma_nozeros_indicator());

  const quasi_unwrap<T2> tmp(Y.get_ref());
  const Mat<T>& B = tmp.M;

  X.check_size(B);

  const T* B_mem = B.memptr();

  if (mode == 0)  // each column
  {
    if (arma_config::openmp && mp_gate<eT>::eval(A.n_elem)) {
#if defined(ARMA_USE_OPENMP)
      {
        const int n_threads = int((std::min)(uword(mp_thread_limit::get()), A_n_cols));

#pragma omp parallel for schedule(static) num_threads(n_threads)
        for (uword i = 0; i < A_n_cols; ++i) {
          const eT* A_mem = A.colptr(i);
          eT* out_mem = out.colptr(i);

          for (uword row = 0; row < A_n_rows; ++row) {
            out_mem[row] = std::pow(A_mem[row], B_mem[row]);
          }
        }
      }
#endif
    } else {
      for (uword i = 0; i < A_n_cols; ++i) {
        const eT* A_mem = A.colptr(i);
        eT* out_mem = out.colptr(i);

        for (uword row = 0; row < A_n_rows; ++row) {
          out_mem[row] = std::pow(A_mem[row], B_mem[row]);
        }
      }
    }
  }

  if (mode == 1)  // each row
  {
    if (arma_config::openmp && mp_gate<eT>::eval(A.n_elem)) {
#if defined(ARMA_USE_OPENMP)
      {
        const int n_threads = int((std::min)(uword(mp_thread_limit::get()), A_n_cols));

#pragma omp parallel for schedule(static) num_threads(n_threads)
        for (uword i = 0; i < A_n_cols; ++i) {
          const eT* A_mem = A.colptr(i);
          eT* out_mem = out.colptr(i);

          const eT B_val = B_mem[i];

          for (uword row = 0; row < A_n_rows; ++row) {
            out_mem[row] = std::pow(A_mem[row], B_val);
          }
        }
      }
#endif
    } else {
      for (uword i = 0; i < A_n_cols; ++i) {
        const eT* A_mem = A.colptr(i);
        eT* out_mem = out.colptr(i);

        const eT B_val = B_mem[i];

        for (uword row = 0; row < A_n_rows; ++row) {
          out_mem[row] = std::pow(A_mem[row], B_val);
        }
      }
    }
  }

  return out;
}

template <typename T1, typename T2>
inline void glue_powext_cx::apply(
    Cube<typename T1::elem_type>& out,
    const mtGlueCube<typename T1::elem_type, T1, T2, glue_powext_cx>& X) {
  arma_debug_sigprint();

  typedef typename T1::elem_type eT;

  typedef typename get_pod_type<eT>::result T;

  const unwrap_cube<T1> UA(X.A);
  const unwrap_cube<T2> UB(X.B);

  const Cube<eT>& A = UA.M;
  const Cube<T>& B = UB.M;

  arma_conform_assert_same_size(A, B, "element-wise pow()");

  glue_powext_cx::apply(out, A, B);
}

template <typename T>
inline void glue_powext_cx::apply(Cube<std::complex<T> >& out,
                                  const Cube<std::complex<T> >& A, const Cube<T>& B) {
  arma_debug_sigprint();

  typedef typename std::complex<T> eT;

  out.set_size(A.n_rows, A.n_cols, A.n_slices);

  const uword N = out.n_elem;

  eT* out_mem = out.memptr();
  const eT* A_mem = A.memptr();
  const T* B_mem = B.memptr();

  if (arma_config::openmp && mp_gate<eT>::eval(N)) {
#if defined(ARMA_USE_OPENMP)
    {
      const int n_threads = mp_thread_limit::get();

#pragma omp parallel for schedule(static) num_threads(n_threads)
      for (uword i = 0; i < N; ++i) {
        out_mem[i] = std::pow(A_mem[i], B_mem[i]);
      }
    }
#endif
  } else {
    for (uword i = 0; i < N; ++i) {
      out_mem[i] = std::pow(A_mem[i], B_mem[i]);
    }
  }
}

template <typename T, typename T2>
inline Cube<std::complex<T> > glue_powext_cx::apply(
    const subview_cube_each1<std::complex<T> >& X, const Base<T, T2>& Y) {
  arma_debug_sigprint();

  typedef typename std::complex<T> eT;

  const Cube<eT>& A = X.P;

  const uword A_n_rows = A.n_rows;
  const uword A_n_cols = A.n_cols;
  const uword A_n_slices = A.n_slices;

  Cube<eT> out(A_n_rows, A_n_cols, A_n_slices, arma_nozeros_indicator());

  const quasi_unwrap<T2> tmp(Y.get_ref());
  const Mat<T>& B = tmp.M;

  X.check_size(B);

  const T* B_mem = B.memptr();
  const uword B_n_elem = B.n_elem;

  if (arma_config::openmp && mp_gate<eT>::eval(A.n_elem)) {
#if defined(ARMA_USE_OPENMP)
    {
      const int n_threads = int((std::min)(uword(mp_thread_limit::get()), A_n_slices));

#pragma omp parallel for schedule(static) num_threads(n_threads)
      for (uword s = 0; s < A_n_slices; ++s) {
        const eT* A_slice_mem = A.slice_memptr(s);
        eT* out_slice_mem = out.slice_memptr(s);

        for (uword i = 0; i < B_n_elem; ++i) {
          out_slice_mem[i] = std::pow(A_slice_mem[i], B_mem[i]);
        }
      }
    }
#endif
  } else {
    for (uword s = 0; s < A_n_slices; ++s) {
      const eT* A_slice_mem = A.slice_memptr(s);
      eT* out_slice_mem = out.slice_memptr(s);

      for (uword i = 0; i < B_n_elem; ++i) {
        out_slice_mem[i] = std::pow(A_slice_mem[i], B_mem[i]);
      }
    }
  }

  return out;
}

//! @}
