// 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_chi2rnd
//! @{

arma_warn_unused inline double chi2rnd(const double df) {
  arma_debug_sigprint();

  op_chi2rnd_varying_df<double> generator;

  return generator(df);
}

template <typename eT>
arma_warn_unused inline typename arma_real_only<eT>::result chi2rnd(const eT df) {
  arma_debug_sigprint();

  op_chi2rnd_varying_df<eT> generator;

  return generator(df);
}

template <typename T1>
arma_warn_unused inline typename enable_if2<(is_arma_type<T1>::value &&
                                             is_real<typename T1::elem_type>::value),
                                            const Op<T1, op_chi2rnd> >::result
chi2rnd(const T1& expr) {
  arma_debug_sigprint();

  return Op<T1, op_chi2rnd>(expr);
}

template <typename obj_type>
arma_warn_unused inline typename enable_if2<
    (is_Mat<obj_type>::value && is_real<typename obj_type::elem_type>::value),
    obj_type>::result
chi2rnd(const typename obj_type::elem_type df, const uword n_rows, const uword n_cols) {
  arma_debug_sigprint();

  if (is_Col<obj_type>::value) {
    arma_conform_check((n_cols != 1), "chi2rnd(): incompatible size");
  } else if (is_Row<obj_type>::value) {
    arma_conform_check((n_rows != 1), "chi2rnd(): incompatible size");
  }

  obj_type out(n_rows, n_cols, arma_nozeros_indicator());

  op_chi2rnd::fill_constant_df(out, df);

  return out;
}

template <typename obj_type>
arma_warn_unused inline
    typename enable_if2<(is_Mat<obj_type>::value &&
                         is_real<typename obj_type::elem_type>::value),
                        obj_type>::result
    chi2rnd(const typename obj_type::elem_type df, const SizeMat& s) {
  arma_debug_sigprint();

  return chi2rnd<obj_type>(df, s.n_rows, s.n_cols);
}

template <typename obj_type>
arma_warn_unused inline
    typename enable_if2<(is_Mat<obj_type>::value &&
                         is_real<typename obj_type::elem_type>::value),
                        obj_type>::result
    chi2rnd(const typename obj_type::elem_type df, const uword n_elem) {
  arma_debug_sigprint();

  if (is_Row<obj_type>::value) {
    return chi2rnd<obj_type>(df, 1, n_elem);
  } else {
    return chi2rnd<obj_type>(df, n_elem, 1);
  }
}

arma_warn_unused inline mat chi2rnd(const double df, const uword n_rows,
                                    const uword n_cols) {
  arma_debug_sigprint();

  return chi2rnd<mat>(df, n_rows, n_cols);
}

arma_warn_unused inline mat chi2rnd(const double df, const SizeMat& s) {
  arma_debug_sigprint();

  return chi2rnd<mat>(df, s.n_rows, s.n_cols);
}

arma_warn_unused inline vec chi2rnd(const double df, const uword n_elem) {
  arma_debug_sigprint();

  return chi2rnd<vec>(df, n_elem, 1);
}

//! @}
