/*

Copyright (C) 1996-2018 John W. Eaton

This file is part of Octave.

Octave is free software: you can redistribute it and/or modify it
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.

Octave is distributed in the hope that it will be useful, but
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.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<https://www.gnu.org/licenses/>.

*/

#if ! defined (octave_DASSL_h)
#define octave_DASSL_h 1

#include "octave-config.h"

#include <string>

#include "Array.h"
#include "DASSL-opts.h"

class Matrix;

class
OCTAVE_API
DASSL : public DAE, public DASSL_options
{
public:

  DASSL (void)
    : DAE (), DASSL_options (), initialized (false), liw (0), lrw (0),
      info (), iwork (), rwork (), abs_tol (), rel_tol () { }

  DASSL (const ColumnVector& s, double tm, DAEFunc& f)
    : DAE (s, tm, f), DASSL_options (), initialized (false), liw (0),
      lrw (0), info (), iwork (), rwork (), abs_tol (), rel_tol () { }

  DASSL (const ColumnVector& s, const ColumnVector& deriv,
         double tm, DAEFunc& f)
    : DAE (s, deriv, tm, f), DASSL_options (), initialized (false),
      liw (0), lrw (0), info (), iwork (), rwork (), abs_tol (),
      rel_tol () { }

  ~DASSL (void) = default;

  ColumnVector do_integrate (double t);

  Matrix do_integrate (const ColumnVector& tout);

  Matrix do_integrate (const ColumnVector& tout, const ColumnVector& tcrit);

  Matrix integrate (const ColumnVector& tout, Matrix& xdot_out);

  Matrix integrate (const ColumnVector& tout, Matrix& xdot_out,
                    const ColumnVector& tcrit);

  std::string error_message (void) const;

private:

  bool initialized;

  octave_f77_int_type liw;
  octave_f77_int_type lrw;

  Array<octave_f77_int_type> info;
  Array<octave_f77_int_type> iwork;

  Array<double> rwork;

  Array<double> abs_tol;
  Array<double> rel_tol;
};

#endif
