// 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_median
//! @{

template <typename T>
struct arma_cx_median_packet {
  T val;
  uword index;
};

template <typename T>
arma_inline bool operator<(const arma_cx_median_packet<T>& A,
                           const arma_cx_median_packet<T>& B) {
  return (A.val < B.val);
}

class op_median : public traits_op_xvec {
 public:
  template <typename T1>
  inline static void apply(Mat<typename T1::elem_type>& out,
                           const Op<T1, op_median>& expr);

  template <typename eT>
  inline static void apply_noalias(
      Mat<eT>& out, const Mat<eT>& X, const uword dim,
      const typename arma_not_cx<eT>::result* junk = nullptr);

  template <typename eT>
  inline static void apply_noalias(
      Mat<eT>& out, const Mat<eT>& X, const uword dim,
      const typename arma_cx_only<eT>::result* junk = nullptr);

  //
  //

  template <typename T1>
  inline static typename T1::elem_type median_vec(
      const T1& X,
      const typename arma_not_cx<typename T1::elem_type>::result* junk = nullptr);

  template <typename T1>
  inline static typename T1::elem_type median_vec(
      const T1& X,
      const typename arma_cx_only<typename T1::elem_type>::result* junk = nullptr);

  //
  //

  template <typename eT>
  inline static eT direct_median(std::vector<eT>& X);

  template <typename T>
  inline static void direct_cx_median_index(uword& out_index1, uword& out_index2,
                                            std::vector<arma_cx_median_packet<T> >& X);
};

//! @}
