// 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_powmat
//! @{

template <typename T1>
arma_warn_unused inline
    typename enable_if2<is_supported_blas_type<typename T1::elem_type>::value,
                        const Op<T1, op_powmat> >::result
    powmat(const Base<typename T1::elem_type, T1>& X, const int y) {
  arma_debug_sigprint();

  const uword aux_a = (y < int(0)) ? uword(-y) : uword(y);
  const uword aux_b = (y < int(0)) ? uword(1) : uword(0);

  return Op<T1, op_powmat>(X.get_ref(), aux_a, aux_b);
}

template <typename T1>
inline typename enable_if2<is_supported_blas_type<typename T1::elem_type>::value,
                           bool>::result
powmat(Mat<typename T1::elem_type>& out, const Base<typename T1::elem_type, T1>& X,
       const int y) {
  arma_debug_sigprint();

  const uword y_val = (y < int(0)) ? uword(-y) : uword(y);
  const bool y_neg = (y < int(0));

  const bool status = op_powmat::apply_direct(out, X.get_ref(), y_val, y_neg);

  if (status == false) {
    out.soft_reset();
    arma_warn(3, "powmat(): transformation failed");
  }

  return status;
}

template <typename T1>
arma_warn_unused inline typename enable_if2<
    is_supported_blas_type<typename T1::elem_type>::value,
    const mtOp<std::complex<typename T1::pod_type>, T1, op_powmat_cx> >::result
powmat(const Base<typename T1::elem_type, T1>& X, const double y) {
  arma_debug_sigprint();

  typedef std::complex<typename T1::pod_type> out_eT;

  return mtOp<out_eT, T1, op_powmat_cx>('j', X.get_ref(), out_eT(y));
}

template <typename T1>
inline typename enable_if2<is_supported_blas_type<typename T1::elem_type>::value,
                           bool>::result
powmat(Mat<std::complex<typename T1::pod_type> >& out,
       const Base<typename T1::elem_type, T1>& X, const double y) {
  arma_debug_sigprint();

  typedef typename T1::pod_type T;

  const bool status = op_powmat_cx::apply_direct(out, X.get_ref(), T(y));

  if (status == false) {
    out.soft_reset();
    arma_warn(3, "powmat(): transformation failed");
  }

  return status;
}

//! @}
