// 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_mvnrnd
//! @{

template <typename T1, typename T2>
arma_warn_unused inline typename enable_if2<is_real<typename T1::elem_type>::value,
                                            const Glue<T1, T2, glue_mvnrnd_vec> >::result
mvnrnd(const Base<typename T1::elem_type, T1>& M,
       const Base<typename T1::elem_type, T2>& C) {
  arma_debug_sigprint();

  return Glue<T1, T2, glue_mvnrnd_vec>(M.get_ref(), C.get_ref());
}

template <typename T1, typename T2>
arma_warn_unused inline typename enable_if2<is_real<typename T1::elem_type>::value,
                                            const Glue<T1, T2, glue_mvnrnd> >::result
mvnrnd(const Base<typename T1::elem_type, T1>& M,
       const Base<typename T1::elem_type, T2>& C, const uword N) {
  arma_debug_sigprint();

  return Glue<T1, T2, glue_mvnrnd>(M.get_ref(), C.get_ref(), N);
}

template <typename T1, typename T2>
inline typename enable_if2<is_real<typename T1::elem_type>::value, bool>::result mvnrnd(
    Mat<typename T1::elem_type>& out, const Base<typename T1::elem_type, T1>& M,
    const Base<typename T1::elem_type, T2>& C) {
  arma_debug_sigprint();

  const bool status = glue_mvnrnd::apply_direct(out, M.get_ref(), C.get_ref(), uword(1));

  if (status == false) {
    out.soft_reset();
    arma_warn(
        3, "mvnrnd(): given covariance matrix is not symmetric positive semi-definite");
  }

  return status;
}

template <typename T1, typename T2>
inline typename enable_if2<is_real<typename T1::elem_type>::value, bool>::result mvnrnd(
    Mat<typename T1::elem_type>& out, const Base<typename T1::elem_type, T1>& M,
    const Base<typename T1::elem_type, T2>& C, const uword N) {
  arma_debug_sigprint();

  const bool status = glue_mvnrnd::apply_direct(out, M.get_ref(), C.get_ref(), N);

  if (status == false) {
    out.soft_reset();
    arma_warn(
        3, "mvnrnd(): given covariance matrix is not symmetric positive semi-definite");
  }

  return status;
}

//! @}
