// 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 fn_min
//! @{

template <typename T1>
arma_warn_unused inline
    typename enable_if2<is_arma_type<T1>::value && resolves_to_vector<T1>::yes,
                        typename T1::elem_type>::result
    min(const T1& X) {
  arma_debug_sigprint();

  return op_min::min(X);
}

template <typename T1>
arma_warn_unused arma_inline
    typename enable_if2<is_arma_type<T1>::value && resolves_to_vector<T1>::no,
                        const Op<T1, op_min> >::result
    min(const T1& X) {
  arma_debug_sigprint();

  return Op<T1, op_min>(X, 0, 0);
}

template <typename T1>
arma_warn_unused arma_inline
    typename enable_if2<is_arma_type<T1>::value, const Op<T1, op_min> >::result
    min(const T1& X, const uword dim) {
  arma_debug_sigprint();

  return Op<T1, op_min>(X, dim, 0);
}

template <typename T>
arma_warn_unused arma_inline typename arma_scalar_only<T>::result min(const T& x) {
  return x;
}

//! element-wise minimum
template <typename T1, typename T2>
arma_warn_unused arma_inline typename enable_if2<
    (is_arma_type<T1>::value && is_arma_type<T2>::value &&
     is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
    const Glue<T1, T2, glue_min> >::result
min(const T1& X, const T2& Y) {
  arma_debug_sigprint();

  return Glue<T1, T2, glue_min>(X, Y);
}

template <typename T1>
arma_warn_unused arma_inline const OpCube<T1, op_min> min(
    const BaseCube<typename T1::elem_type, T1>& X, const uword dim = 0) {
  arma_debug_sigprint();

  return OpCube<T1, op_min>(X.get_ref(), dim, 0);
}

template <typename T1, typename T2>
arma_warn_unused arma_inline const GlueCube<T1, T2, glue_min> min(
    const BaseCube<typename T1::elem_type, T1>& X,
    const BaseCube<typename T1::elem_type, T2>& Y) {
  arma_debug_sigprint();

  return GlueCube<T1, T2, glue_min>(X.get_ref(), Y.get_ref());
}

template <typename T1>
arma_warn_unused inline typename enable_if2<is_arma_sparse_type<T1>::value &&
                                                resolves_to_sparse_vector<T1>::yes,
                                            typename T1::elem_type>::result
min(const T1& x) {
  arma_debug_sigprint();

  return op_sp_min::vector_min(x);
}

template <typename T1>
arma_warn_unused inline typename enable_if2<
    is_arma_sparse_type<T1>::value && resolves_to_sparse_vector<T1>::no,
    const mtSpReduceOp<typename T1::elem_type, T1, op_sp_min> >::result
min(const T1& X) {
  arma_debug_sigprint();

  return mtSpReduceOp<typename T1::elem_type, T1, op_sp_min>(X, 0, 0);
}

template <typename T1>
arma_warn_unused inline typename enable_if2<
    is_arma_sparse_type<T1>::value,
    const mtSpReduceOp<typename T1::elem_type, T1, op_sp_min> >::result
min(const T1& X, const uword dim) {
  arma_debug_sigprint();

  return mtSpReduceOp<typename T1::elem_type, T1, op_sp_min>(X, dim, 0);
}

// elementwise sparse min
template <typename T1, typename T2>
arma_warn_unused inline typename enable_if2<
    (is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value &&
     is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
    const SpGlue<T1, T2, spglue_min> >::result
min(const T1& x, const T2& y) {
  arma_debug_sigprint();

  return SpGlue<T1, T2, spglue_min>(x, y);
}

//! elementwise min of dense and sparse objects with the same element type
template <typename T1, typename T2>
inline typename enable_if2<
    (is_arma_type<T1>::value && is_arma_sparse_type<T2>::value &&
     is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
    Mat<typename T1::elem_type> >::result
min(const T1& x, const T2& y) {
  arma_debug_sigprint();

  Mat<typename T1::elem_type> out;

  spglue_min::dense_sparse_min(out, x, y);

  return out;
}

//! elementwise min of sparse and dense objects with the same element type
template <typename T1, typename T2>
inline typename enable_if2<
    (is_arma_sparse_type<T1>::value && is_arma_type<T2>::value &&
     is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
    Mat<typename T1::elem_type> >::result
min(const T1& x, const T2& y) {
  arma_debug_sigprint();

  Mat<typename T1::elem_type> out;

  // Just call the other order (these operations are commutative)
  // TODO: if there is a matrix size mismatch, the debug assert will print the matrix
  // sizes in wrong order
  spglue_min::dense_sparse_min(out, y, x);

  return out;
}

arma_warn_unused inline uword min(const SizeMat& s) {
  return (std::min)(s.n_rows, s.n_cols);
}

arma_warn_unused inline uword min(const SizeCube& s) {
  return (std::min)((std::min)(s.n_rows, s.n_cols), s.n_slices);
}

//! @}
