#include <../src/ksp/pc/impls/factor/factor.h>     /*I "petscpc.h"  I*/

/* ------------------------------------------------------------------------------------------*/

PetscErrorCode PCFactorSetUpMatSolverType_Factor(PC pc)
{
  PC_Factor      *icc = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  PetscCheck(pc->pmat,PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"You can only call this routine after the matrix object has been provided to the solver, for example with KSPSetOperators() or SNESSetJacobian()");
  if (!pc->setupcalled && !((PC_Factor*)icc)->fact) {
    PetscCall(MatGetFactor(pc->pmat,((PC_Factor*)icc)->solvertype,((PC_Factor*)icc)->factortype,&((PC_Factor*)icc)->fact));
  }
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetZeroPivot_Factor(PC pc,PetscReal z)
{
  PC_Factor *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  ilu->info.zeropivot = z;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetShiftType_Factor(PC pc,MatFactorShiftType shifttype)
{
  PC_Factor *dir = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  if (shifttype == (MatFactorShiftType)PETSC_DECIDE) dir->info.shifttype = (PetscReal) MAT_SHIFT_NONE;
  else {
    dir->info.shifttype = (PetscReal) shifttype;
    if ((shifttype == MAT_SHIFT_NONZERO || shifttype ==  MAT_SHIFT_INBLOCKS) && dir->info.shiftamount == 0.0) {
      dir->info.shiftamount = 100.0*PETSC_MACHINE_EPSILON; /* set default amount if user has not called PCFactorSetShiftAmount() yet */
    }
  }
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetShiftAmount_Factor(PC pc,PetscReal shiftamount)
{
  PC_Factor *dir = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  if (shiftamount == (PetscReal) PETSC_DECIDE) dir->info.shiftamount = 100.0*PETSC_MACHINE_EPSILON;
  else dir->info.shiftamount = shiftamount;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetDropTolerance_Factor(PC pc,PetscReal dt,PetscReal dtcol,PetscInt dtcount)
{
  PC_Factor *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  if (pc->setupcalled && (!ilu->info.usedt || ((PC_Factor*)ilu)->info.dt != dt || ((PC_Factor*)ilu)->info.dtcol != dtcol || ((PC_Factor*)ilu)->info.dtcount != dtcount)) {
    SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Cannot change tolerance after use");
  }
  ilu->info.usedt   = PETSC_TRUE;
  ilu->info.dt      = dt;
  ilu->info.dtcol   = dtcol;
  ilu->info.dtcount = dtcount;
  ilu->info.fill    = PETSC_DEFAULT;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetFill_Factor(PC pc,PetscReal fill)
{
  PC_Factor *dir = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  dir->info.fill = fill;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetMatOrderingType_Factor(PC pc,MatOrderingType ordering)
{
  PC_Factor      *dir = (PC_Factor*)pc->data;
  PetscBool      flg;

  PetscFunctionBegin;
  if (!pc->setupcalled) {
    PetscCall(PetscFree(dir->ordering));
    PetscCall(PetscStrallocpy(ordering,(char**)&dir->ordering));
  } else {
    PetscCall(PetscStrcmp(dir->ordering,ordering,&flg));
    PetscCheck(flg,PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Cannot change ordering after use");
  }
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorGetLevels_Factor(PC pc,PetscInt *levels)
{
  PC_Factor      *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  *levels = ilu->info.levels;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorGetZeroPivot_Factor(PC pc,PetscReal *pivot)
{
  PC_Factor      *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  *pivot = ilu->info.zeropivot;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorGetShiftAmount_Factor(PC pc,PetscReal *shift)
{
  PC_Factor      *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  *shift = ilu->info.shiftamount;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorGetShiftType_Factor(PC pc,MatFactorShiftType *type)
{
  PC_Factor      *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  *type = (MatFactorShiftType) (int) ilu->info.shifttype;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetLevels_Factor(PC pc,PetscInt levels)
{
  PC_Factor      *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  if (!pc->setupcalled) ilu->info.levels = levels;
  else if (ilu->info.levels != levels) {
    PetscCall((*pc->ops->reset)(pc)); /* remove previous factored matrices */
    pc->setupcalled  = 0; /* force a complete rebuild of preconditioner factored matrices */
    ilu->info.levels = levels;
  } else PetscCheckFalse(ilu->info.usedt,PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Cannot change levels after use with ILUdt");
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetAllowDiagonalFill_Factor(PC pc,PetscBool flg)
{
  PC_Factor *dir = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  dir->info.diagonal_fill = (PetscReal) flg;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorGetAllowDiagonalFill_Factor(PC pc,PetscBool *flg)
{
  PC_Factor *dir = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  *flg = dir->info.diagonal_fill ? PETSC_TRUE : PETSC_FALSE;
  PetscFunctionReturn(0);
}

/* ------------------------------------------------------------------------------------------*/

PetscErrorCode  PCFactorSetPivotInBlocks_Factor(PC pc,PetscBool pivot)
{
  PC_Factor *dir = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  dir->info.pivotinblocks = pivot ? 1.0 : 0.0;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorGetMatrix_Factor(PC pc,Mat *mat)
{
  PC_Factor *ilu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  PetscCheck(ilu->fact,PetscObjectComm((PetscObject)pc),PETSC_ERR_ORDER,"Matrix not yet factored; call after KSPSetUp() or PCSetUp()");
  *mat = ilu->fact;
  PetscFunctionReturn(0);
}

/* allow access to preallocation information */
#include <petsc/private/matimpl.h>

PetscErrorCode  PCFactorSetMatSolverType_Factor(PC pc,MatSolverType stype)
{
  PC_Factor      *lu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  if (lu->fact && lu->fact->assembled) {
    MatSolverType ltype;
    PetscBool     flg;
    PetscCall(MatFactorGetSolverType(lu->fact,&ltype));
    PetscCall(PetscStrcmp(stype,ltype,&flg));
    PetscCheck(flg,PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Cannot change solver matrix package from %s to %s after PC has been setup or used",ltype,stype);
  }

  PetscCall(PetscFree(lu->solvertype));
  PetscCall(PetscStrallocpy(stype,&lu->solvertype));
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorGetMatSolverType_Factor(PC pc,MatSolverType *stype)
{
  PC_Factor *lu = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  *stype = lu->solvertype;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCFactorSetColumnPivot_Factor(PC pc,PetscReal dtcol)
{
  PC_Factor *dir = (PC_Factor*)pc->data;

  PetscFunctionBegin;
  PetscCheckFalse(dtcol < 0.0 || dtcol > 1.0,PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_OUTOFRANGE,"Column pivot tolerance is %g must be between 0 and 1",(double)dtcol);
  dir->info.dtcol = dtcol;
  PetscFunctionReturn(0);
}

PetscErrorCode  PCSetFromOptions_Factor(PetscOptionItems *PetscOptionsObject,PC pc)
{
  PC_Factor         *factor = (PC_Factor*)pc->data;
  PetscBool         flg,set;
  char              tname[256], solvertype[64];
  PetscFunctionList ordlist;
  PetscEnum         etmp;
  PetscBool         inplace;

  PetscFunctionBegin;
  PetscCall(PCFactorGetUseInPlace(pc,&inplace));
  PetscCall(PetscOptionsBool("-pc_factor_in_place","Form factored matrix in the same memory as the matrix","PCFactorSetUseInPlace",inplace,&flg,&set));
  if (set) {
    PetscCall(PCFactorSetUseInPlace(pc,flg));
  }
  PetscCall(PetscOptionsReal("-pc_factor_fill","Expected non-zeros in factored matrix","PCFactorSetFill",((PC_Factor*)factor)->info.fill,&((PC_Factor*)factor)->info.fill,NULL));

  PetscCall(PetscOptionsEnum("-pc_factor_shift_type","Type of shift to add to diagonal","PCFactorSetShiftType",MatFactorShiftTypes,(PetscEnum)(int)((PC_Factor*)factor)->info.shifttype,&etmp,&flg));
  if (flg) {
    PetscCall(PCFactorSetShiftType(pc,(MatFactorShiftType)etmp));
  }
  PetscCall(PetscOptionsReal("-pc_factor_shift_amount","Shift added to diagonal","PCFactorSetShiftAmount",((PC_Factor*)factor)->info.shiftamount,&((PC_Factor*)factor)->info.shiftamount,NULL));

  PetscCall(PetscOptionsReal("-pc_factor_zeropivot","Pivot is considered zero if less than","PCFactorSetZeroPivot",((PC_Factor*)factor)->info.zeropivot,&((PC_Factor*)factor)->info.zeropivot,NULL));
  PetscCall(PetscOptionsReal("-pc_factor_column_pivot","Column pivot tolerance (used only for some factorization)","PCFactorSetColumnPivot",((PC_Factor*)factor)->info.dtcol,&((PC_Factor*)factor)->info.dtcol,&flg));

  PetscCall(PetscOptionsBool("-pc_factor_pivot_in_blocks","Pivot inside matrix dense blocks for BAIJ and SBAIJ","PCFactorSetPivotInBlocks",((PC_Factor*)factor)->info.pivotinblocks ? PETSC_TRUE : PETSC_FALSE,&flg,&set));
  if (set) {
    PetscCall(PCFactorSetPivotInBlocks(pc,flg));
  }

  PetscCall(PetscOptionsBool("-pc_factor_reuse_fill","Use fill from previous factorization","PCFactorSetReuseFill",PETSC_FALSE,&flg,&set));
  if (set) {
    PetscCall(PCFactorSetReuseFill(pc,flg));
  }
  PetscCall(PetscOptionsBool("-pc_factor_reuse_ordering","Reuse ordering from previous factorization","PCFactorSetReuseOrdering",PETSC_FALSE,&flg,&set));
  if (set) {
    PetscCall(PCFactorSetReuseOrdering(pc,flg));
  }

  PetscCall(PetscOptionsDeprecated("-pc_factor_mat_solver_package","-pc_factor_mat_solver_type","3.9",NULL));
  PetscCall(PetscOptionsString("-pc_factor_mat_solver_type","Specific direct solver to use","MatGetFactor",((PC_Factor*)factor)->solvertype,solvertype,sizeof(solvertype),&flg));
  if (flg) {
    PetscCall(PCFactorSetMatSolverType(pc,solvertype));
  }
  PetscCall(PCFactorSetDefaultOrdering_Factor(pc));
  PetscCall(MatGetOrderingList(&ordlist));
  PetscCall(PetscOptionsFList("-pc_factor_mat_ordering_type","Reordering to reduce nonzeros in factored matrix","PCFactorSetMatOrderingType",ordlist,((PC_Factor*)factor)->ordering,tname,sizeof(tname),&flg));
  if (flg) {
    PetscCall(PCFactorSetMatOrderingType(pc,tname));
  }
  PetscFunctionReturn(0);
}

PetscErrorCode PCView_Factor(PC pc,PetscViewer viewer)
{
  PC_Factor       *factor = (PC_Factor*)pc->data;
  PetscBool       isstring,iascii,canuseordering;
  MatInfo         info;
  MatOrderingType ordering;

  PetscFunctionBegin;
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERSTRING,&isstring));
  PetscCall(PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii));
  if (iascii) {
    if (factor->inplace) {
      PetscCall(PetscViewerASCIIPrintf(viewer,"  in-place factorization\n"));
    } else {
      PetscCall(PetscViewerASCIIPrintf(viewer,"  out-of-place factorization\n"));
    }

    if (factor->reusefill)     PetscCall(PetscViewerASCIIPrintf(viewer,"  Reusing fill from past factorization\n"));
    if (factor->reuseordering) PetscCall(PetscViewerASCIIPrintf(viewer,"  Reusing reordering from past factorization\n"));
    if (factor->factortype == MAT_FACTOR_ILU || factor->factortype == MAT_FACTOR_ICC) {
      if (factor->info.dt > 0) {
        PetscCall(PetscViewerASCIIPrintf(viewer,"  drop tolerance %g\n",(double)factor->info.dt));
        PetscCall(PetscViewerASCIIPrintf(viewer,"  max nonzeros per row %" PetscInt_FMT "\n",(PetscInt)factor->info.dtcount));
        PetscCall(PetscViewerASCIIPrintf(viewer,"  column permutation tolerance %g\n",(double)factor->info.dtcol));
      } else if (factor->info.levels == 1) {
        PetscCall(PetscViewerASCIIPrintf(viewer,"  %" PetscInt_FMT " level of fill\n",(PetscInt)factor->info.levels));
      } else {
        PetscCall(PetscViewerASCIIPrintf(viewer,"  %" PetscInt_FMT " levels of fill\n",(PetscInt)factor->info.levels));
      }
    }

    PetscCall(PetscViewerASCIIPrintf(viewer,"  tolerance for zero pivot %g\n",(double)factor->info.zeropivot));
    if (MatFactorShiftTypesDetail[(int)factor->info.shifttype]) { /* Only print when using a nontrivial shift */
      PetscCall(PetscViewerASCIIPrintf(viewer,"  using %s [%s]\n",MatFactorShiftTypesDetail[(int)factor->info.shifttype],MatFactorShiftTypes[(int)factor->info.shifttype]));
    }

    if (factor->fact) {
      PetscCall(MatFactorGetCanUseOrdering(factor->fact,&canuseordering));
      if (!canuseordering) ordering = MATORDERINGEXTERNAL;
      else ordering = factor->ordering;
      PetscCall(PetscViewerASCIIPrintf(viewer,"  matrix ordering: %s\n",ordering));
      if (!factor->fact->assembled) {
        PetscCall(PetscViewerASCIIPrintf(viewer,"  matrix solver type: %s\n",factor->fact->solvertype));
        PetscCall(PetscViewerASCIIPrintf(viewer,"  matrix not yet factored; no additional information available\n"));
      } else {
        PetscCall(MatGetInfo(factor->fact,MAT_LOCAL,&info));
        PetscCall(PetscViewerASCIIPrintf(viewer,"  factor fill ratio given %g, needed %g\n",(double)info.fill_ratio_given,(double)info.fill_ratio_needed));
        PetscCall(PetscViewerASCIIPrintf(viewer,"    Factored matrix follows:\n"));
        PetscCall(PetscViewerASCIIPushTab(viewer));
        PetscCall(PetscViewerASCIIPushTab(viewer));
        PetscCall(PetscViewerASCIIPushTab(viewer));
        PetscCall(PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_INFO));
        PetscCall(MatView(factor->fact,viewer));
        PetscCall(PetscViewerPopFormat(viewer));
        PetscCall(PetscViewerASCIIPopTab(viewer));
        PetscCall(PetscViewerASCIIPopTab(viewer));
        PetscCall(PetscViewerASCIIPopTab(viewer));
      }
    }

  } else if (isstring) {
    MatFactorType t;
    PetscCall(MatGetFactorType(factor->fact,&t));
    if (t == MAT_FACTOR_ILU || t == MAT_FACTOR_ICC) {
      PetscCall(PetscViewerStringSPrintf(viewer," lvls=%" PetscInt_FMT ",order=%s",(PetscInt)factor->info.levels,factor->ordering));
    }
  }
  PetscFunctionReturn(0);
}