// Copyright (C) 2005, 2009 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Eclipse Public License.
//
// Authors:  Carl Laird, Andreas Waechter          IBM    2005-08-15

#ifndef __IPSOLVESTATISTICS_HPP__
#define __IPSOLVESTATISTICS_HPP__

#include "IpReferenced.hpp"
#include "IpSmartPtr.hpp"

namespace Ipopt
{

// forward declaration (to avoid inclusion of too many header files)
class IpoptNLP;
class IpoptData;
class IpoptCalculatedQuantities;

/** This class collects statistics about an optimization run, such
 *  as iteration count, final infeasibilities etc.  It is meant to
 *  provide such information to a user of Ipopt during the
 *  finalize_solution call.
 */
class IPOPTLIB_EXPORT SolveStatistics : public ReferencedObject
{
public:
   /**@name Constructors/Destructors */
   ///@{
   /** Default constructor.
    *
    *  It takes in those collecting Ipopt
    *  objects that can provide the statistics information.  Those
    *  statistics are retrieved at the time of the constructor
    *  call.
    */
   SolveStatistics(
      const SmartPtr<IpoptNLP>&                  ip_nlp,
      const SmartPtr<IpoptData>&                 ip_data,
      const SmartPtr<IpoptCalculatedQuantities>& ip_cq
   );

   /** Default destructor */
   virtual ~SolveStatistics()
   { }
   ///@}

   /** @name Accessor methods for retrieving different kind of solver statistics information */
   ///@{
   /** Iteration counts. */
   virtual Index IterationCount() const;

   /** Total CPU time, including function evaluations. */
   virtual Number TotalCpuTime() const;

   /** Total CPU time, including function evaluations.
    *
    * Included for backward compatibility.
    */
   Number TotalCPUTime() const
   {
      return TotalCpuTime();
   }

   /** Total System time, including function evaluations. */
   virtual Number TotalSysTime() const;

   /** Total wall clock time, including function evaluations. */
   virtual Number TotalWallclockTime() const;

   /** Number of NLP function evaluations. */
   virtual void NumberOfEvaluations(
      Index& num_obj_evals,
      Index& num_constr_evals,
      Index& num_obj_grad_evals,
      Index& num_constr_jac_evals,
      Index& num_hess_evals
   ) const;

   /** Unscaled solution infeasibilities. */
   virtual void Infeasibilities(
      Number& dual_inf,
      Number& constr_viol,
      Number& complementarity,
      Number& kkt_error
   ) const;

   /** Scaled solution infeasibilities. */
   virtual void ScaledInfeasibilities(
      Number& scaled_dual_inf,
      Number& scaled_constr_viol,
      Number& scaled_complementarity,
      Number& scaled_kkt_error
   ) const;

   /** Final value of objective function */
   virtual Number FinalObjective() const;

   /** Final scaled value of objective function */
   virtual Number FinalScaledObjective() const;
   ///@}

private:
   /**@name Default Compiler Generated Methods
    * (Hidden to avoid implicit creation/calling).
    *
    * These methods are not implemented and
    * we do not want the compiler to implement
    * them for us, so we declare them private
    * and do not define them. This ensures that
    * they will not be implicitly created/called.
    */
   ///@{
   /** Default Constructor */
   SolveStatistics();

   /** Copy Constructor */
   SolveStatistics(
      const SolveStatistics&
   );

   /** Default Assignment Operator */
   void operator=(
      const SolveStatistics&
   );
   ///@}

   /** @name Fields for storing the statistics data */
   ///@{
   /** Number of iterations. */
   Index num_iters_;
   /* Total CPU time */
   Number total_cpu_time_;
   /* Total system time */
   Number total_sys_time_;
   /* Total wall clock time */
   Number total_wallclock_time_;
   /** Number of objective function evaluations. */
   Index num_obj_evals_;
   /** Number of constraints evaluations (max of equality and inequality) */
   Index num_constr_evals_;
   /** Number of objective gradient evaluations. */
   Index num_obj_grad_evals_;
   /** Number of constraint Jacobian evaluations. */
   Index num_constr_jac_evals_;
   /** Number of Lagrangian Hessian evaluations. */
   Index num_hess_evals_;

   /** Final scaled value of objective function */
   Number scaled_obj_val_;
   /** Final unscaled value of objective function */
   Number obj_val_;
   /** Final scaled dual infeasibility (max-norm) */
   Number scaled_dual_inf_;
   /** Final unscaled dual infeasibility (max-norm) */
   Number dual_inf_;
   /** Final scaled constraint violation (max-norm) */
   Number scaled_constr_viol_;
   /** Final unscaled constraint violation (max-norm) */
   Number constr_viol_;
   /** Final scaled complementarity error (max-norm) */
   Number scaled_compl_;
   /** Final unscaled complementarity error (max-norm) */
   Number compl_;
   /** Final overall scaled KKT error (max-norm) */
   Number scaled_kkt_error_;
   /** Final overall unscaled KKT error (max-norm) */
   Number kkt_error_;
   ///@}
};

} // namespace Ipopt

#endif
