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//
// Copyright (C) 1994-2024 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
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// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
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// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include "CMatrix.h"
#include "aepbalance.h"
#include "dColVector.h"
#include "dMatrix.h"
#include "fCMatrix.h"
#include "fColVector.h"
#include "fMatrix.h"
#include "lo-error.h"
#include "lo-lapack-proto.h"

OCTAVE_BEGIN_NAMESPACE(octave)

static inline char
get_job (bool noperm, bool noscal)
{
  return noperm ? (noscal ? 'N' : 'S') : (noscal ? 'P' : 'B');
}

OCTAVE_BEGIN_NAMESPACE(math)

template <>
OCTAVE_API
aepbalance<Matrix>::aepbalance (const Matrix& a, bool noperm, bool noscal)
  : m_balanced_mat (a), m_scale (), m_ilo (), m_ihi (),
    m_job (get_job (noperm, noscal))
{
  F77_INT n = to_f77_int (a.cols ());

  if (a.rows () != n)
    (*current_liboctave_error_handler)
      ("aepbalance: requires square matrix");

  m_scale = ColumnVector (n);

  F77_INT info, t_ilo, t_ihi;

  F77_XFCN (dgebal, DGEBAL, (F77_CONST_CHAR_ARG2 (&m_job, 1), n,
                             m_balanced_mat.fortran_vec (), n,
                             t_ilo, t_ihi, m_scale.fortran_vec (), info
                             F77_CHAR_ARG_LEN (1)));

  m_ilo = t_ilo;
  m_ihi = t_ihi;
}

template <>
OCTAVE_API Matrix
aepbalance<Matrix>::balancing_matrix () const
{
  F77_INT n = to_f77_int (m_balanced_mat.rows ());

  Matrix balancing_mat (n, n, 0.0);
  for (F77_INT i = 0; i < n; i++)
    balancing_mat.elem (i, i) = 1.0;

  F77_INT info;
  F77_INT t_ilo = to_f77_int (m_ilo);
  F77_INT t_ihi = to_f77_int (m_ihi);

  char side = 'R';

  F77_XFCN (dgebak, DGEBAK, (F77_CONST_CHAR_ARG2 (&m_job, 1),
                             F77_CONST_CHAR_ARG2 (&side, 1),
                             n, t_ilo, t_ihi, m_scale.data (), n,
                             balancing_mat.fortran_vec (), n, info
                             F77_CHAR_ARG_LEN (1)
                             F77_CHAR_ARG_LEN (1)));

  return balancing_mat;
}

template <>
OCTAVE_API
aepbalance<FloatMatrix>::aepbalance (const FloatMatrix& a, bool noperm,
                                     bool noscal)
  : m_balanced_mat (a), m_scale (), m_ilo (), m_ihi (),
    m_job (get_job (noperm, noscal))
{
  F77_INT n = to_f77_int (a.cols ());

  if (a.rows () != n)
    (*current_liboctave_error_handler)
      ("aepbalance: requires square matrix");

  m_scale = FloatColumnVector (n);

  F77_INT info, t_ilo, t_ihi;

  F77_XFCN (sgebal, SGEBAL, (F77_CONST_CHAR_ARG2 (&m_job, 1), n,
                             m_balanced_mat.fortran_vec (), n, t_ilo,
                             t_ihi, m_scale.fortran_vec (), info
                             F77_CHAR_ARG_LEN (1)));

  m_ilo = t_ilo;
  m_ihi = t_ihi;
}

template <>
OCTAVE_API FloatMatrix
aepbalance<FloatMatrix>::balancing_matrix () const
{
  F77_INT n = to_f77_int (m_balanced_mat.rows ());

  FloatMatrix balancing_mat (n, n, 0.0);
  for (F77_INT i = 0; i < n; i++)
    balancing_mat.elem (i, i) = 1.0;

  F77_INT info;
  F77_INT t_ilo = to_f77_int (m_ilo);
  F77_INT t_ihi = to_f77_int (m_ihi);

  char side = 'R';

  F77_XFCN (sgebak, SGEBAK, (F77_CONST_CHAR_ARG2 (&m_job, 1),
                             F77_CONST_CHAR_ARG2 (&side, 1),
                             n, t_ilo, t_ihi, m_scale.data (), n,
                             balancing_mat.fortran_vec (), n, info
                             F77_CHAR_ARG_LEN (1)
                             F77_CHAR_ARG_LEN (1)));

  return balancing_mat;
}

template <>
OCTAVE_API
aepbalance<ComplexMatrix>::aepbalance (const ComplexMatrix& a, bool noperm,
                                       bool noscal)
  : m_balanced_mat (a), m_scale (), m_ilo (), m_ihi (),
    m_job (get_job (noperm, noscal))
{
  F77_INT n = to_f77_int (a.cols ());

  if (a.rows () != n)
    (*current_liboctave_error_handler)
      ("aepbalance: requires square matrix");

  m_scale = ColumnVector (n);

  F77_INT info, t_ilo, t_ihi;

  F77_XFCN (zgebal, ZGEBAL,
            (F77_CONST_CHAR_ARG2 (&m_job, 1), n,
             F77_DBLE_CMPLX_ARG (m_balanced_mat.fortran_vec ()),
             n, t_ilo, t_ihi, m_scale.fortran_vec (), info
             F77_CHAR_ARG_LEN (1)));

  m_ilo = t_ilo;
  m_ihi = t_ihi;
}

template <>
OCTAVE_API ComplexMatrix
aepbalance<ComplexMatrix>::balancing_matrix () const
{
  F77_INT n = to_f77_int (m_balanced_mat.rows ());

  ComplexMatrix balancing_mat (n, n, 0.0);
  for (F77_INT i = 0; i < n; i++)
    balancing_mat.elem (i, i) = 1.0;

  F77_INT info;
  F77_INT t_ilo = to_f77_int (m_ilo);
  F77_INT t_ihi = to_f77_int (m_ihi);

  char side = 'R';

  F77_XFCN (zgebak, ZGEBAK,
            (F77_CONST_CHAR_ARG2 (&m_job, 1),
             F77_CONST_CHAR_ARG2 (&side, 1),
             n, t_ilo, t_ihi, m_scale.data (), n,
             F77_DBLE_CMPLX_ARG (balancing_mat.fortran_vec ()),
             n, info
             F77_CHAR_ARG_LEN (1)
             F77_CHAR_ARG_LEN (1)));

  return balancing_mat;
}

template <>
OCTAVE_API
aepbalance<FloatComplexMatrix>::aepbalance (const FloatComplexMatrix& a,
    bool noperm, bool noscal)
  : m_balanced_mat (a), m_scale (), m_ilo (), m_ihi (),
    m_job (get_job (noperm, noscal))
{
  F77_INT n = to_f77_int (a.cols ());

  if (a.rows () != n)
    (*current_liboctave_error_handler)
      ("aepbalance: requires square matrix");

  m_scale = FloatColumnVector (n);

  F77_INT info, t_ilo, t_ihi;

  F77_XFCN (cgebal, CGEBAL, (F77_CONST_CHAR_ARG2 (&m_job, 1), n,
                             F77_CMPLX_ARG (m_balanced_mat.fortran_vec ()),
                             n, t_ilo, t_ihi, m_scale.fortran_vec (), info
                             F77_CHAR_ARG_LEN (1)));

  m_ilo = t_ilo;
  m_ihi = t_ihi;
}

template <>
OCTAVE_API FloatComplexMatrix
aepbalance<FloatComplexMatrix>::balancing_matrix () const
{
  F77_INT n = to_f77_int (m_balanced_mat.rows ());

  FloatComplexMatrix balancing_mat (n, n, 0.0);
  for (F77_INT i = 0; i < n; i++)
    balancing_mat.elem (i, i) = 1.0;

  F77_INT info;
  F77_INT t_ilo = to_f77_int (m_ilo);
  F77_INT t_ihi = to_f77_int (m_ihi);

  char side = 'R';

  F77_XFCN (cgebak, CGEBAK, (F77_CONST_CHAR_ARG2 (&m_job, 1),
                             F77_CONST_CHAR_ARG2 (&side, 1),
                             n, t_ilo, t_ihi, m_scale.data (), n,
                             F77_CMPLX_ARG (balancing_mat.fortran_vec ()),
                             n, info
                             F77_CHAR_ARG_LEN (1)
                             F77_CHAR_ARG_LEN (1)));

  return balancing_mat;
}

// Instantiations we need.

template class aepbalance<Matrix>;

template class aepbalance<FloatMatrix>;

template class aepbalance<ComplexMatrix>;

template class aepbalance<FloatComplexMatrix>;

OCTAVE_END_NAMESPACE(math)
OCTAVE_END_NAMESPACE(octave)
