#if !defined(TAOALMM_H)
#define TAOALMM_H
#include <petsc/private/taoimpl.h>

typedef struct {
  Tao            subsolver, parent;                     /* subsolver for aug-lag subproblem */
  PetscErrorCode (*sub_obj)(Tao);                       /* subsolver objective function */
  TaoALMMType    type;                                  /* subsolver objective type */

  IS             *Pis, *Yis;                            /* index sets to separate primal and dual vector spaces */
  VecScatter     *Pscatter, *Yscatter;                  /* scatter objects to write into combined vector spaces */

  Mat            Ae, Ai;                                /* aliased constraint Jacobians (do not destroy!) */
  Vec            Px, LgradX, Ce, Ci, G;                 /* aliased vectors (do not destroy!) */
  Vec            Ps, LgradS, Yi, Ye;                    /* sub-vectors for primal variables */
  Vec            *Parr, P, PL, PU, *Yarr, Y, C;         /* arrays and vectors for combined vector spaces */
  Vec            Xwork, Cework, Ciwork, Cizero;         /* work vectors */

  PetscReal      Lval, fval, gnorm, cnorm, cenorm, cinorm, cnorm_old;   /* scalar variables */
  PetscReal      mu0, mu, mu_fac, mu_pow_good, mu_pow_bad;              /* penalty parameters */
  PetscReal      ytol0, ytol, gtol0, gtol;                              /* convergence parameters */
  PetscReal      mu_max, ye_min, yi_min, ye_max, yi_max;                /* parameter safeguards */

  PetscBool      info;
} TAO_ALMM;

PETSC_INTERN PetscErrorCode TaoALMMGetType_Private(Tao,TaoALMMType*);
PETSC_INTERN PetscErrorCode TaoALMMSetType_Private(Tao,TaoALMMType);
PETSC_INTERN PetscErrorCode TaoALMMGetSubsolver_Private(Tao,Tao*);
PETSC_INTERN PetscErrorCode TaoALMMSetSubsolver_Private(Tao,Tao);
PETSC_INTERN PetscErrorCode TaoALMMGetMultipliers_Private(Tao,Vec*);
PETSC_INTERN PetscErrorCode TaoALMMSetMultipliers_Private(Tao,Vec);
PETSC_INTERN PetscErrorCode TaoALMMGetPrimalIS_Private(Tao,IS*,IS*);
PETSC_INTERN PetscErrorCode TaoALMMGetDualIS_Private(Tao,IS*,IS*);
PETSC_INTERN PetscErrorCode TaoALMMSubsolverObjective_Private(Tao,Vec,PetscReal*,void*);
PETSC_INTERN PetscErrorCode TaoALMMSubsolverObjectiveAndGradient_Private(Tao,Vec,PetscReal*,Vec,void*);

#endif