!   
!                Parallel Sparse BLAS  version 3.5
!      (C) Copyright 2006-2018
!        Salvatore Filippone    
!        Alfredo Buttari      
!   
!    Redistribution and use in source and binary forms, with or without
!    modification, are permitted provided that the following conditions
!    are met:
!      1. Redistributions of source code must retain the above copyright
!         notice, this list of conditions and the following disclaimer.
!      2. Redistributions in binary form must reproduce the above copyright
!         notice, this list of conditions, and the following disclaimer in the
!         documentation and/or other materials provided with the distribution.
!      3. The name of the PSBLAS group or the names of its contributors may
!         not be used to endorse or promote products derived from this
!         software without specific written permission.
!   
!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!    POSSIBILITY OF SUCH DAMAGE.
!   
!    

subroutine psb_c_bjac_dump(prec,info,prefix,head)
  use psb_base_mod
  use psb_c_bjacprec, psb_protect_name => psb_c_bjac_dump
  implicit none 
  class(psb_c_bjac_prec_type), intent(in) :: prec
  integer(psb_ipk_), intent(out)                    :: info
  character(len=*), intent(in), optional  :: prefix,head
  integer(psb_ipk_) :: i, j, il1, iln, lname, lev
  type(psb_ctxt_type) :: ctxt
  integer(psb_ipk_) :: iam, np
  character(len=80)  :: prefix_
  character(len=120) :: fname ! len should be at least 20 more than

  !  len of prefix_ 

  info = 0
  ctxt = prec%get_ctxt()
  call psb_info(ctxt,iam,np)

  if (present(prefix)) then 
    prefix_ = trim(prefix(1:min(len(prefix),len(prefix_))))
  else
    prefix_ = "dump_fact_c"
  end if

  lname = len_trim(prefix_)
  fname = trim(prefix_)
  write(fname(lname+1:lname+5),'(a,i3.3)') '_p',iam
  lname = lname + 5
  write(fname(lname+1:),'(a)')'_lower.mtx'
  if (prec%av(psb_l_pr_)%is_asb())  &
       & call prec%av(psb_l_pr_)%print(fname,head=head)
  write(fname(lname+1:),'(a,a)')'_diag.mtx'
  if (allocated(prec%dv)) &
       & call psb_geprt(fname,prec%dv%v%v,head=head)
  write(fname(lname+1:),'(a)')'_upper.mtx'
  if (prec%av(psb_u_pr_)%is_asb()) &
       & call prec%av(psb_u_pr_)%print(fname,head=head)

end subroutine psb_c_bjac_dump

subroutine psb_c_bjac_apply_vect(alpha,prec,x,beta,y,desc_data,info,trans,work)
  use psb_base_mod
  use psb_c_bjacprec, psb_protect_name => psb_c_bjac_apply_vect
  implicit none 
  type(psb_desc_type),intent(in)    :: desc_data
  class(psb_c_bjac_prec_type), intent(inout)  :: prec
  complex(psb_spk_),intent(in)         :: alpha,beta
  type(psb_c_vect_type),intent(inout)   :: x
  type(psb_c_vect_type),intent(inout)   :: y
  integer(psb_ipk_), intent(out)              :: info
  character(len=1), optional        :: trans
  complex(psb_spk_),intent(inout), optional, target :: work(:)

  ! Local variables
  integer(psb_ipk_) :: n_row,n_col
  complex(psb_spk_), pointer :: ww(:), aux(:)
  type(psb_c_vect_type) :: wv, wv1
  type(psb_ctxt_type) :: ctxt
  integer(psb_ipk_) :: np,me
  integer(psb_ipk_) :: err_act, ierr(5)
  integer(psb_ipk_) :: debug_level, debug_unit
  logical            :: do_alloc_wrk
  character          :: trans_
  character(len=20)  :: name='c_bjac_prec_apply'
  character(len=20)  :: ch_err

  info = psb_success_
  call psb_erractionsave(err_act)
  debug_unit  = psb_get_debug_unit()
  debug_level = psb_get_debug_level()
  ctxt       = desc_data%get_context()
  call psb_info(ctxt, me, np)


  trans_ = psb_toupper(trans)
  select case(trans_)
  case('N','T','C')
    ! Ok
  case default
    call psb_errpush(psb_err_iarg_invalid_i_,name)
    goto 9999
  end select


  n_row = desc_data%get_local_rows()
  n_col = desc_data%get_local_cols()

  if (x%get_nrows() < n_row) then 
    info = 36; ierr(1) = 2; ierr(2) = n_row;
    call psb_errpush(info,name,i_err=ierr)
    goto 9999
  end if
  if (y%get_nrows() < n_row) then 
    info = 36; ierr(1) = 3; ierr(2) = n_row;
    call psb_errpush(info,name,i_err=ierr)
    goto 9999
  end if
  if (.not.allocated(prec%dv)) then
    info = 1124
    call psb_errpush(info,name,a_err="preconditioner: D")
    goto 9999
  end if
  if (prec%dv%get_nrows() < n_row) then
    info = 1124
    call psb_errpush(info,name,a_err="preconditioner: D")
    goto 9999
  end if


  if (n_col <= size(work)) then 
    ww => work(1:n_col)
    if ((4*n_col+n_col) <= size(work)) then 
      aux => work(n_col+1:)
    else
      allocate(aux(4*n_col),stat=info)

    endif
  else
    allocate(ww(n_col),aux(4*n_col),stat=info)
  endif

  if (info /= psb_success_) then 
    call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
    goto 9999      
  end if

  do_alloc_wrk = .not.prec%is_allocated_wrk()
  if (do_alloc_wrk) call prec%allocate_wrk(info,vmold=x%v)

  associate (wv => prec%wrk(1), wv1 => prec%wrk(2))
    
    select case(prec%iprcparm(psb_f_type_))
    case(psb_f_ilu_n_) 
      
      select case(trans_)
      case('N')
        call psb_spsm(cone,prec%av(psb_l_pr_),x,czero,wv,desc_data,info,&
             & trans=trans_,scale='L',diag=prec%dv,choice=psb_none_,work=aux)
        if(info == psb_success_) call psb_spsm(alpha,prec%av(psb_u_pr_),wv,&
             & beta,y,desc_data,info,&
             & trans=trans_,scale='U',choice=psb_none_, work=aux)
        
      case('T')
        call psb_spsm(cone,prec%av(psb_u_pr_),x,czero,wv,desc_data,info,&
             & trans=trans_,scale='L',diag=prec%dv,choice=psb_none_, work=aux)
        if(info == psb_success_)  call psb_spsm(alpha,prec%av(psb_l_pr_),wv,&
             & beta,y,desc_data,info,&
             & trans=trans_,scale='U',choice=psb_none_,work=aux)
        
      case('C')
        
        call psb_spsm(cone,prec%av(psb_u_pr_),x,czero,wv,desc_data,info,&
             & trans=trans_,scale='U',choice=psb_none_, work=aux)
        
        call wv1%mlt(cone,prec%dv,wv,czero,info,conjgx=trans_)
        
        if(info == psb_success_)  call psb_spsm(alpha,prec%av(psb_l_pr_),wv1,&
             & beta,y,desc_data,info,&
             & trans=trans_,scale='U',choice=psb_none_,work=aux)
        
      end select
      if (info /= psb_success_) then 
        ch_err="psb_spsm"
        goto 9999
      end if
      
    case default
      info = psb_err_internal_error_
      call psb_errpush(info,name,a_err='Invalid factorization')
      goto 9999
    end select

  end associate
  
  call psb_halo(y,desc_data,info,data=psb_comm_mov_)

  if (do_alloc_wrk) call prec%free_wrk(info)
  if (n_col <= size(work)) then 
    if ((4*n_col+n_col) <= size(work)) then 
    else
      deallocate(aux)
    endif
  else
    deallocate(ww,aux)
  endif


  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_errpush(info,name,i_err=ierr,a_err=ch_err)
  call psb_error_handler(err_act)
  return

end subroutine psb_c_bjac_apply_vect

subroutine psb_c_bjac_apply(alpha,prec,x,beta,y,desc_data,info,trans,work)
  use psb_base_mod
  use psb_c_bjacprec, psb_protect_name => psb_c_bjac_apply
  implicit none 
  type(psb_desc_type),intent(in)    :: desc_data
  class(psb_c_bjac_prec_type), intent(inout)  :: prec
  complex(psb_spk_),intent(in)         :: alpha,beta
  complex(psb_spk_),intent(inout)      :: x(:)
  complex(psb_spk_),intent(inout)      :: y(:)
  integer(psb_ipk_), intent(out)              :: info
  character(len=1), optional        :: trans
  complex(psb_spk_),intent(inout), optional, target :: work(:)

  ! Local variables
  integer(psb_ipk_) :: n_row,n_col
  complex(psb_spk_), pointer :: ww(:), aux(:)
  type(psb_ctxt_type) :: ctxt
  integer(psb_ipk_) :: np,me
  integer(psb_ipk_) :: err_act, ierr(5)
  integer(psb_ipk_) :: debug_level, debug_unit
  character          :: trans_
  character(len=20)  :: name='c_bjac_prec_apply'
  character(len=20)  :: ch_err

  info = psb_success_
  call psb_erractionsave(err_act)
  debug_unit  = psb_get_debug_unit()
  debug_level = psb_get_debug_level()
  ctxt       = desc_data%get_context()
  call psb_info(ctxt, me, np)


  trans_ = psb_toupper(trans)
  select case(trans_)
  case('N','T','C')
    ! Ok
  case default
    call psb_errpush(psb_err_iarg_invalid_i_,name)
    goto 9999
  end select


  n_row = desc_data%get_local_rows()
  n_col = desc_data%get_local_cols()

  if (size(x) < n_row) then 
    info = 36; ierr(1) = 2; ierr(2) = n_row;
    call psb_errpush(info,name,i_err=ierr)
    goto 9999
  end if
  if (size(y) < n_row) then 
    info = 36; ierr(1) = 3; ierr(2) = n_row;
    call psb_errpush(info,name,i_err=ierr)
    goto 9999
  end if
  if (.not.allocated(prec%dv)) then
    info = 1124
    call psb_errpush(info,name,a_err="preconditioner: D")
    goto 9999
  end if
  if (prec%dv%get_nrows() < n_row) then
    info = 1124
    call psb_errpush(info,name,a_err="preconditioner: D")
    goto 9999
  end if


  if (n_col <= size(work)) then 
    ww => work(1:n_col)
    if ((4*n_col+n_col) <= size(work)) then 
      aux => work(n_col+1:)
    else
      allocate(aux(4*n_col),stat=info)
      if (info /= psb_success_) then 
        call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
        goto 9999      
      end if

    endif
  else
    allocate(ww(n_col),aux(4*n_col),stat=info)
    if (info /= psb_success_) then 
      call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
      goto 9999      
    end if
  endif


  select case(prec%iprcparm(psb_f_type_))
  case(psb_f_ilu_n_) 

    select case(trans_)
    case('N')
      call psb_spsm(cone,prec%av(psb_l_pr_),x,czero,ww,desc_data,info,&
           & trans=trans_,scale='L',diag=prec%dv%v%v,choice=psb_none_,work=aux)
      if(info == psb_success_) call psb_spsm(alpha,prec%av(psb_u_pr_),ww,&
           & beta,y,desc_data,info,&
           & trans=trans_,scale='U',choice=psb_none_, work=aux)

    case('T')
      call psb_spsm(cone,prec%av(psb_u_pr_),x,czero,ww,desc_data,info,&
           & trans=trans_,scale='L',diag=prec%dv%v%v,choice=psb_none_, work=aux)
      if(info == psb_success_)  call psb_spsm(alpha,prec%av(psb_l_pr_),ww,&
           & beta,y,desc_data,info,&
           & trans=trans_,scale='U',choice=psb_none_,work=aux)

    case('C')

      call psb_spsm(cone,prec%av(psb_u_pr_),x,czero,ww,desc_data,info,&
           & trans=trans_,scale='U',choice=psb_none_, work=aux)
      ww(1:n_row) = ww(1:n_row)*conjg(prec%dv%v%v(1:n_row))
      if(info == psb_success_)  call psb_spsm(alpha,prec%av(psb_l_pr_),ww,&
           & beta,y,desc_data,info,&
           & trans=trans_,scale='U',choice=psb_none_,work=aux)

    end select
    if (info /= psb_success_) then 
      ch_err="psb_spsm"
      goto 9999
    end if


  case default
    info = psb_err_internal_error_
    call psb_errpush(info,name,a_err='Invalid factorization')
    goto 9999
  end select

  call psb_halo(y,desc_data,info,data=psb_comm_mov_)

  if (n_col <= size(work)) then 
    if ((4*n_col+n_col) <= size(work)) then 
    else
      deallocate(aux)
    endif
  else
    deallocate(ww,aux)
  endif


  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_errpush(info,name,i_err=ierr,a_err=ch_err)
  call psb_error_handler(err_act)
  return

end subroutine psb_c_bjac_apply

subroutine psb_c_bjac_precinit(prec,info)
  use psb_base_mod
  use psb_c_bjacprec, psb_protect_name => psb_c_bjac_precinit
  Implicit None

  class(psb_c_bjac_prec_type),intent(inout) :: prec
  integer(psb_ipk_), intent(out)                     :: info
  integer(psb_ipk_) :: err_act, nrow
  character(len=20)  :: name='c_bjac_precinit'

  call psb_erractionsave(err_act)

  info = psb_success_
  call psb_realloc(psb_ifpsz,prec%iprcparm,info)
  if (info /= psb_success_) then
    info = psb_err_alloc_dealloc_
    call psb_Errpush(info,name)
    goto 9999
  end if

  prec%iprcparm(:)                = 0
  prec%iprcparm(psb_p_type_)      = psb_bjac_
  prec%iprcparm(psb_f_type_)      = psb_f_ilu_n_
  prec%iprcparm(psb_ilu_fill_in_) = 0


  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(err_act)
  return

end subroutine psb_c_bjac_precinit


subroutine psb_c_bjac_precbld(a,desc_a,prec,info,amold,vmold,imold)

  use psb_base_mod
  use psb_prec_mod, only : psb_ilu_fct
  use psb_c_bjacprec, psb_protect_name => psb_c_bjac_precbld
  Implicit None

  type(psb_cspmat_type), intent(in), target :: a
  type(psb_desc_type), intent(inout), target   :: desc_a
  class(psb_c_bjac_prec_type),intent(inout) :: prec
  integer(psb_ipk_), intent(out)                      :: info
  class(psb_c_base_sparse_mat), intent(in), optional :: amold
  class(psb_c_base_vect_type), intent(in), optional  :: vmold
  class(psb_i_base_vect_type), intent(in), optional  :: imold

  !     .. Local Scalars ..                                                       
  integer(psb_ipk_) ::    i, m
  integer(psb_ipk_) ::    ierr(5)
  character ::        trans, unitd
  type(psb_c_csr_sparse_mat), allocatable  :: lf, uf
  complex(psb_spk_), allocatable :: dd(:)
  integer(psb_ipk_) :: nztota,  err_act, n_row, nrow_a,n_col, nhalo
  type(psb_ctxt_type) :: ctxt
  integer(psb_ipk_) :: np,me
  character(len=20)  :: name='c_bjac_precbld'
  character(len=20)  :: ch_err


  info = psb_success_

  call psb_erractionsave(err_act)
  if (psb_errstatus_fatal()) then
    info = psb_err_internal_error_ ;    goto 9999
  end if

  ctxt=desc_a%get_ctxt()
  call prec%set_ctxt(ctxt)
  call psb_info(ctxt, me, np)

  m = a%get_nrows()
  if (m < 0) then
    info = psb_err_iarg_neg_
    ierr(1) = 1;  ierr(2) = m
    call psb_errpush(info,name,i_err=ierr)
    goto 9999
  endif
  trans = 'N'
  unitd = 'U'

  select case(prec%iprcparm(psb_f_type_))

  case(psb_f_ilu_n_) 

    if (allocated(prec%av)) then 
      if (size(prec%av) < psb_bp_ilu_avsz) then 
        do i=1,size(prec%av) 
          call prec%av(i)%free()
        enddo
        deallocate(prec%av,stat=info)
      endif
    end if
    if (.not.allocated(prec%av)) then 
      allocate(prec%av(psb_max_avsz),stat=info)
      if (info /= psb_success_) then
        call psb_errpush(psb_err_alloc_dealloc_,name)
        goto 9999
      end if
    endif

    nrow_a = desc_a%get_local_rows()
    nztota = a%get_nzeros()

    n_col  = desc_a%get_local_cols()
    nhalo  = n_col-nrow_a
    n_row  = nrow_a

    allocate(lf,uf,stat=info)
    if (info == psb_success_) call lf%allocate(n_row,n_row,nztota)
    if (info == psb_success_) call uf%allocate(n_row,n_row,nztota)

    if(info /= psb_success_) then
      info=psb_err_from_subroutine_
      ch_err='psb_sp_all'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end if

    allocate(dd(n_row),stat=info)
    if (info == psb_success_) then 
      allocate(prec%dv, stat=info)
      if (info == 0) then 
        if (present(vmold)) then 
          allocate(prec%dv%v,mold=vmold,stat=info) 
        else       
          allocate(psb_c_base_vect_type :: prec%dv%v,stat=info) 
        end if
      end if
    end if

    if (info /= psb_success_) then 
      call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
      goto 9999      
    endif
    ! This is where we have no renumbering, thus no need 
    call psb_ilu_fct(a,lf,uf,dd,info)

    if(info == psb_success_) then
      call prec%av(psb_l_pr_)%mv_from(lf)
      call prec%av(psb_u_pr_)%mv_from(uf)
      call prec%av(psb_l_pr_)%set_asb()
      call prec%av(psb_u_pr_)%set_asb()
      call prec%av(psb_l_pr_)%trim()
      call prec%av(psb_u_pr_)%trim()
      call prec%dv%bld(dd)
      ! call move_alloc(dd,prec%d)
    else
      info=psb_err_from_subroutine_
      ch_err='psb_ilu_fct'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end if

  case(psb_f_none_) 
    info=psb_err_from_subroutine_
    ch_err='Inconsistent prec  psb_f_none_'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999

  case default
    info=psb_err_from_subroutine_
    ch_err='Unknown psb_f_type_'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  end select

  if (present(amold)) then 
    call prec%av(psb_l_pr_)%cscnv(info,mold=amold)
    call prec%av(psb_u_pr_)%cscnv(info,mold=amold)
  end if

  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(err_act)
  return
end subroutine psb_c_bjac_precbld

subroutine psb_c_bjac_precseti(prec,what,val,info)

  use psb_base_mod
  use psb_c_bjacprec, psb_protect_name => psb_c_bjac_precseti
  Implicit None

  class(psb_c_bjac_prec_type),intent(inout) :: prec
  integer(psb_ipk_), intent(in)                      :: what 
  integer(psb_ipk_), intent(in)                      :: val 
  integer(psb_ipk_), intent(out)                     :: info
  integer(psb_ipk_) :: err_act, nrow
  character(len=20)  :: name='c_bjac_precset'

  call psb_erractionsave(err_act)

  info = psb_success_
  if (.not.allocated(prec%iprcparm)) then 
    info = 1124
    call psb_errpush(info,name,a_err="preconditioner")
    goto 9999
  end if

  select case(what)
  case (psb_f_type_) 
    if (prec%iprcparm(psb_p_type_) /= psb_bjac_) then 
      write(psb_err_unit,*) 'WHAT is invalid for current preconditioner ',&
           & prec%iprcparm(psb_p_type_),&
           & 'ignoring user specification'
      return
    endif
    prec%iprcparm(psb_f_type_)     = val

  case (psb_ilu_fill_in_) 
    if ((prec%iprcparm(psb_p_type_) /= psb_bjac_).or.&
         & (prec%iprcparm(psb_f_type_) /= psb_f_ilu_n_)) then 
      write(psb_err_unit,*) 'WHAT is invalid for current preconditioner ',&
           & prec%iprcparm(psb_p_type_),&
           & 'ignoring user specification'
      return
    endif
    prec%iprcparm(psb_ilu_fill_in_) = val

  case default
    write(psb_err_unit,*) 'WHAT is invalid, ignoring user specification'

  end select

  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(err_act)
  return
end subroutine psb_c_bjac_precseti