#if !defined(PETSCTAOLINESEARCH_H)
#define PETSCTAOLINESEARCH_H

typedef struct _p_TaoLineSearch* TaoLineSearch;

#include <petsctao.h>

typedef enum {
    TAOLINESEARCH_FAILED_INFORNAN = -1,
    TAOLINESEARCH_FAILED_BADPARAMETER = -2,
    TAOLINESEARCH_FAILED_ASCENT = -3,
    TAOLINESEARCH_CONTINUE_ITERATING = 0,
    TAOLINESEARCH_SUCCESS = 1,
    TAOLINESEARCH_SUCCESS_USER = 2,
    TAOLINESEARCH_HALTED_OTHER = 3,
    TAOLINESEARCH_HALTED_MAXFCN = 4,
    TAOLINESEARCH_HALTED_UPPERBOUND = 5,
    TAOLINESEARCH_HALTED_LOWERBOUND = 6,
    TAOLINESEARCH_HALTED_RTOL = 7,
    TAOLINESEARCH_HALTED_USER = 8
} TaoLineSearchConvergedReason;

typedef const char *TaoLineSearchType;
#define TAOLINESEARCHUNIT     "unit"
#define TAOLINESEARCHMT       "more-thuente"
#define TAOLINESEARCHGPCG     "gpcg"
#define TAOLINESEARCHARMIJO   "armijo"
#define TAOLINESEARCHOWARMIJO "owarmijo"
#define TAOLINESEARCHIPM      "ipm"

PETSC_EXTERN PetscClassId TAOLINESEARCH_CLASSID;
PETSC_EXTERN PetscFunctionList TaoLineSearchList;

PETSC_EXTERN PetscErrorCode TaoLineSearchCreate(MPI_Comm,TaoLineSearch*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetFromOptions(TaoLineSearch);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetUp(TaoLineSearch);
PETSC_EXTERN PetscErrorCode TaoLineSearchDestroy(TaoLineSearch*);
PETSC_EXTERN PetscErrorCode TaoLineSearchMonitor(TaoLineSearch,PetscInt,PetscReal,PetscReal);
PETSC_EXTERN PetscErrorCode TaoLineSearchView(TaoLineSearch,PetscViewer);
PETSC_EXTERN PetscErrorCode TaoLineSearchViewFromOptions(TaoLineSearch,PetscObject,const char[]);

PETSC_EXTERN PetscErrorCode TaoLineSearchSetOptionsPrefix(TaoLineSearch,const char prefix[]);
PETSC_EXTERN PetscErrorCode TaoLineSearchReset(TaoLineSearch);
PETSC_EXTERN PetscErrorCode TaoLineSearchAppendOptionsPrefix(TaoLineSearch,const char[]);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetOptionsPrefix(TaoLineSearch,const char*[]);
PETSC_EXTERN PetscErrorCode TaoLineSearchApply(TaoLineSearch,Vec,PetscReal*,Vec,Vec,PetscReal*,TaoLineSearchConvergedReason*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetStepLength(TaoLineSearch,PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetStartingVector(TaoLineSearch,Vec*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetStepDirection(TaoLineSearch,Vec*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetInitialStepLength(TaoLineSearch,PetscReal);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetSolution(TaoLineSearch,Vec,PetscReal*,Vec,PetscReal*,TaoLineSearchConvergedReason*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetFullStepObjective(TaoLineSearch,PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchGetNumberFunctionEvaluations(TaoLineSearch,PetscInt*,PetscInt*,PetscInt*);

PETSC_EXTERN PetscErrorCode TaoLineSearchGetType(TaoLineSearch,TaoLineSearchType*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetType(TaoLineSearch,TaoLineSearchType);

PETSC_EXTERN PetscErrorCode TaoLineSearchIsUsingTaoRoutines(TaoLineSearch,PetscBool*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetObjectiveAndGTSRoutine(TaoLineSearch,PetscErrorCode(*)(TaoLineSearch,Vec,Vec,PetscReal*,PetscReal*,void*),void*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetObjectiveRoutine(TaoLineSearch,PetscErrorCode(*)(TaoLineSearch,Vec,PetscReal*,void*),void*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetGradientRoutine(TaoLineSearch,PetscErrorCode(*)(TaoLineSearch,Vec,Vec,void*),void*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetObjectiveAndGradientRoutine(TaoLineSearch,PetscErrorCode(*)(TaoLineSearch,Vec,PetscReal*,Vec,void*),void*);

PETSC_EXTERN PetscErrorCode TaoLineSearchComputeObjective(TaoLineSearch,Vec,PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchComputeGradient(TaoLineSearch,Vec,Vec);
PETSC_EXTERN PetscErrorCode TaoLineSearchComputeObjectiveAndGradient(TaoLineSearch,Vec,PetscReal*,Vec);
PETSC_EXTERN PetscErrorCode TaoLineSearchComputeObjectiveAndGTS(TaoLineSearch,Vec,PetscReal*,PetscReal*);
PETSC_EXTERN PetscErrorCode TaoLineSearchSetVariableBounds(TaoLineSearch,Vec,Vec);

PETSC_EXTERN PetscErrorCode TaoLineSearchInitializePackage(void);
PETSC_EXTERN PetscErrorCode TaoLineSearchFinalizePackage(void);

PETSC_EXTERN PetscErrorCode TaoLineSearchRegister(const char[],PetscErrorCode (*)(TaoLineSearch));
PETSC_EXTERN PetscErrorCode TaoLineSearchUseTaoRoutines(TaoLineSearch,Tao);

#endif