/* -*- C++ -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2003-2006

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

#ifndef LEMON_LP_GLPK_H

#define LEMON_LP_GLPK_H

///\file

///\brief Header of the LEMON-GLPK lp solver interface.

///\ingroup gen_opt_group

#include <lemon/lp_base.h>

extern "C" {

#include <glpk.h>

}

namespace lemon {

  /// \brief Interface for the GLPK LP solver

  /// 

  /// This class implements an interface for the GLPK LP solver.

  ///\ingroup gen_opt_group

  class LpGlpk : virtual public LpSolverBase {

  protected:

    LPX* lp;

  public:

    typedef LpSolverBase Parent;

    LpGlpk();

    ~LpGlpk();

  protected:

    virtual LpSolverBase &_newLp();

    virtual LpSolverBase &_copyLp();

    virtual int _addCol();

    virtual int _addRow();

    virtual void _eraseCol(int i);

    virtual void _eraseRow(int i);

    virtual void _getColName(int col,       std::string & name);

    virtual void _setColName(int col, const std::string & name);

    virtual void _setRowCoeffs(int i, 

			       int length,

                               const int   * indices, 

                               const Value   * values );

    virtual void _setColCoeffs(int i, 

			       int length,

                               const int   * indices, 

                               const Value   * values);

    virtual void _setCoeff(int row, int col, Value value);

    virtual void _setColLowerBound(int i, Value value);

    virtual void _setColUpperBound(int i, Value value);

//     virtual void _setRowLowerBound(int i, Value value);

//     virtual void _setRowUpperBound(int i, Value value);

    virtual void _setRowBounds(int i, Value lower, Value upper);

    virtual void _setObjCoeff(int i, Value obj_coef);

    virtual void _clearObj();

//     virtual void _setObj(int length,

//                          int  const * indices, 

//                          Value  const * values ) = 0;

    ///\e

    ///\todo It should be clarified

    ///

    virtual SolveExitStatus _solve();

    virtual Value _getPrimal(int i);

    virtual Value _getDual(int i);

    virtual Value _getPrimalValue();

    virtual bool _isBasicCol(int i);

    ///\e

    ///\todo It should be clarified

    ///

    virtual SolutionStatus _getPrimalStatus();

    virtual SolutionStatus _getDualStatus();

    virtual ProblemTypes _getProblemType();

    virtual void _setMax();

    virtual void _setMin();

  public:

    ///Set the verbosity of the messages

    ///Set the verbosity of the messages

    ///

    ///\param m is the level of the messages output by the solver routines.

    ///The possible values are:

    ///- 0 --- no output (default value)

    ///- 1 --- error messages only

    ///- 2 --- normal output

    ///- 3 --- full output (includes informational messages)

    void messageLevel(int m);

    ///Turns on or off the presolver

    ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver

    ///

    ///The presolver is off by default.

    void presolver(bool b);

  };

} //END OF NAMESPACE LEMON

#endif //LEMON_LP_GLPK_H