// 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_randg
//! @{

template <typename obj_type>
arma_warn_unused inline obj_type randg(
    const uword n_rows, const uword n_cols, const distr_param& param = distr_param(),
    const typename arma_Mat_Col_Row_only<obj_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  typedef typename obj_type::elem_type eT;

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

  double a = double(1);
  double b = double(1);

  param.get_double_vals(a, b);

  arma_conform_check(
      ((a <= double(0)) || (b <= double(0))),
      "randg(): incorrect distribution parameters; a and b must be greater than zero");

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

  arma_rng::randg<eT>::fill(out.memptr(), out.n_elem, a, b);

  return out;
}

template <typename obj_type>
arma_warn_unused inline obj_type randg(
    const SizeMat& s, const distr_param& param = distr_param(),
    const typename arma_Mat_Col_Row_only<obj_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  return randg<obj_type>(s.n_rows, s.n_cols, param);
}

template <typename obj_type>
arma_warn_unused inline obj_type randg(
    const uword n_elem, const distr_param& param = distr_param(),
    const arma_empty_class junk1 = arma_empty_class(),
    const typename arma_Mat_Col_Row_only<obj_type>::result* junk2 = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  const uword n_rows = (is_Row<obj_type>::value) ? uword(1) : n_elem;
  const uword n_cols = (is_Row<obj_type>::value) ? n_elem : uword(1);

  return randg<obj_type>(n_rows, n_cols, param);
}

arma_warn_unused inline mat randg(const uword n_rows, const uword n_cols,
                                  const distr_param& param = distr_param()) {
  arma_debug_sigprint();

  return randg<mat>(n_rows, n_cols, param);
}

arma_warn_unused inline mat randg(const SizeMat& s,
                                  const distr_param& param = distr_param()) {
  arma_debug_sigprint();

  return randg<mat>(s.n_rows, s.n_cols, param);
}

arma_warn_unused inline vec randg(const uword n_elem,
                                  const distr_param& param = distr_param()) {
  arma_debug_sigprint();

  return randg<vec>(n_elem, uword(1), param);
}

arma_warn_unused inline double randg(const distr_param& param = distr_param()) {
  arma_debug_sigprint();

  double a = double(1);
  double b = double(1);

  param.get_double_vals(a, b);

  arma_conform_check(
      ((a <= double(0)) || (b <= double(0))),
      "randg(): incorrect distribution parameters; a and b must be greater than zero");

  double out_val = double(0);

  arma_rng::randg<double>::fill(&out_val, uword(1), a, b);

  return out_val;
}

template <typename eT>
arma_warn_unused inline typename arma_real_or_cx_only<eT>::result randg(
    const distr_param& param = distr_param()) {
  arma_debug_sigprint();

  double a = double(1);
  double b = double(1);

  param.get_double_vals(a, b);

  arma_conform_check(
      ((a <= double(0)) || (b <= double(0))),
      "randg(): incorrect distribution parameters; a and b must be greater than zero");

  eT out_val = eT(0);

  arma_rng::randg<eT>::fill(&out_val, uword(1), a, b);

  return out_val;
}

template <typename cube_type>
arma_warn_unused inline cube_type randg(
    const uword n_rows, const uword n_cols, const uword n_slices,
    const distr_param& param = distr_param(),
    const typename arma_Cube_only<cube_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  typedef typename cube_type::elem_type eT;

  double a = double(1);
  double b = double(1);

  param.get_double_vals(a, b);

  arma_conform_check(
      ((a <= double(0)) || (b <= double(0))),
      "randg(): incorrect distribution parameters; a and b must be greater than zero");

  cube_type out(n_rows, n_cols, n_slices, arma_nozeros_indicator());

  arma_rng::randg<eT>::fill(out.memptr(), out.n_elem, a, b);

  return out;
}

template <typename cube_type>
arma_warn_unused inline cube_type randg(
    const SizeCube& s, const distr_param& param = distr_param(),
    const typename arma_Cube_only<cube_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  return randg<cube_type>(s.n_rows, s.n_cols, s.n_slices, param);
}

arma_warn_unused inline cube randg(const uword n_rows, const uword n_cols,
                                   const uword n_slices,
                                   const distr_param& param = distr_param()) {
  arma_debug_sigprint();

  return randg<cube>(n_rows, n_cols, n_slices, param);
}

arma_warn_unused inline cube randg(const SizeCube& s,
                                   const distr_param& param = distr_param()) {
  arma_debug_sigprint();

  return randg<cube>(s.n_rows, s.n_cols, s.n_slices, param);
}

//! @}
