// 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_eig_pair
//! @{

template <typename T1, typename T2>
arma_warn_unused inline
    typename enable_if2<is_supported_blas_type<typename T1::pod_type>::value,
                        Col<std::complex<typename T1::pod_type> > >::result
    eig_pair(const Base<typename T1::elem_type, T1>& A_expr,
             const Base<typename T1::elem_type, T2>& B_expr) {
  arma_debug_sigprint();

  typedef typename T1::pod_type T;

  Col<std::complex<T> > eigvals;
  Mat<std::complex<T> > eigvecs;

  const bool status =
      auxlib::eig_pair(eigvals, eigvecs, false, A_expr.get_ref(), B_expr.get_ref());

  if (status == false) {
    eigvals.soft_reset();
    arma_stop_runtime_error("eig_pair(): decomposition failed");
  }

  return eigvals;
}

template <typename T1, typename T2>
inline typename enable_if2<is_supported_blas_type<typename T1::pod_type>::value,
                           bool>::result
eig_pair(Col<std::complex<typename T1::pod_type> >& eigvals,
         const Base<typename T1::elem_type, T1>& A_expr,
         const Base<typename T1::elem_type, T2>& B_expr) {
  arma_debug_sigprint();

  typedef typename T1::pod_type T;

  Mat<std::complex<T> > eigvecs;

  const bool status =
      auxlib::eig_pair(eigvals, eigvecs, false, A_expr.get_ref(), B_expr.get_ref());

  if (status == false) {
    eigvals.soft_reset();
    arma_warn(3, "eig_pair(): decomposition failed");
  }

  return status;
}

template <typename T1, typename T2>
inline typename enable_if2<is_supported_blas_type<typename T1::pod_type>::value,
                           bool>::result
eig_pair(Col<std::complex<typename T1::pod_type> >& eigvals,
         Mat<std::complex<typename T1::pod_type> >& eigvecs,
         const Base<typename T1::elem_type, T1>& A_expr,
         const Base<typename T1::elem_type, T2>& B_expr) {
  arma_debug_sigprint();

  arma_conform_check((void_ptr(&eigvals) == void_ptr(&eigvecs)),
                     "eig_pair(): parameter 'eigval' is an alias of parameter 'eigvec'");

  const bool status =
      auxlib::eig_pair(eigvals, eigvecs, true, A_expr.get_ref(), B_expr.get_ref());

  if (status == false) {
    eigvals.soft_reset();
    eigvecs.soft_reset();
    arma_warn(3, "eig_pair(): decomposition failed");
  }

  return status;
}

template <typename T1, typename T2>
inline typename enable_if2<is_supported_blas_type<typename T1::pod_type>::value,
                           bool>::result
eig_pair(Col<std::complex<typename T1::pod_type> >& eigvals,
         Mat<std::complex<typename T1::pod_type> >& leigvecs,
         Mat<std::complex<typename T1::pod_type> >& reigvecs,
         const Base<typename T1::elem_type, T1>& A_expr,
         const Base<typename T1::elem_type, T2>& B_expr) {
  arma_debug_sigprint();

  arma_conform_check((void_ptr(&eigvals) == void_ptr(&leigvecs)),
                     "eig_pair(): parameter 'eigval' is an alias of parameter 'leigvec'");
  arma_conform_check((void_ptr(&eigvals) == void_ptr(&reigvecs)),
                     "eig_pair(): parameter 'eigval' is an alias of parameter 'reigvec'");
  arma_conform_check(
      (void_ptr(&leigvecs) == void_ptr(&reigvecs)),
      "eig_pair(): parameter 'leigvec' is an alias of parameter 'reigvec'");

  const bool status = auxlib::eig_pair_twosided(eigvals, leigvecs, reigvecs,
                                                A_expr.get_ref(), B_expr.get_ref());

  if (status == false) {
    eigvals.soft_reset();
    leigvecs.soft_reset();
    reigvecs.soft_reset();
    arma_warn(3, "eig_pair(): decomposition failed");
  }

  return status;
}

//! @}
