module psb_regen_mod

  interface csr_regen
    module procedure csr_dsp_regen, csr_zsp_regen
  end interface
  interface coo_regen
    module procedure coo_dsp_regen, coo_zsp_regen
  end interface
  interface jad_regen
    module procedure jad_dsp_regen, jad_zsp_regen
  end interface

contains
  
  subroutine csr_dsp_regen(a,info)

    use psb_spmat_type
    use psb_const_mod
    use psb_error_mod
    implicit none

    type(psb_dspmat_type), intent(inout)    :: a
    integer                              :: info

    integer :: i,j, k, ip1,ip2,nnz,iflag,ichk,nnzt
    real(kind(1.d0)), allocatable  :: work(:)
    integer :: err_act
    character(len=20)             :: name, ch_err
    logical, parameter :: debug=.false.

    name='psb_spcnv'
    info = 0
    call psb_erractionsave(err_act)


    !
    !   dupl_ and upd_ fields should not be changed. 
    !
    select case(psb_sp_getifld(psb_upd_,a,info))

    case(psb_upd_perm_)

      allocate(work(size(a%aspk)+1000),stat=info)
      if (info /= 0) then
        info=2040
        call psb_errpush(info,name)
        goto 9999
      end if

      if (debug) write(0,*) 'Regeneration with psb_upd_perm_'
      ip1   = psb_sp_getifld(psb_upd_pnt_,a,info) 
      ip2   = a%ia2(ip1+psb_ip2_)
      nnz   = a%ia2(ip1+psb_nnz_)
      iflag = a%ia2(ip1+psb_iflag_)
      ichk  = a%ia2(ip1+psb_ichk_)
      nnzt  = a%ia2(ip1+psb_nnzt_)
      if (debug) write(*,*) 'Regeneration start: ',&
           &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,info

      if ((ichk/=nnzt+iflag).or.(nnz/=nnzt)) then               
        info = 8889
        write(*,*) 'Regeneration start error: ',&
             &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,ichk    
        call psb_errpush(info,name)
        goto 9999
      endif
      do i= 1, nnz
        work(i) = dzero
      enddo
      select case(iflag) 
      case(psb_dupl_ovwrt_,psb_dupl_err_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) 
        enddo
      case(psb_dupl_add_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) + work(a%ia2(ip2+i-1)) 
        enddo
      case default
        info = 8887
        call psb_errpush(info,name)
        goto 9999          
      end select

      do i=1, nnz
        a%aspk(i) = work(i)
      enddo


    case(psb_upd_srch_)
      ! Nothing to be done  here. 
      if (debug) write(0,*) 'Going through on regeneration with psb_upd_srch_'
    case default
      ! Wrong value
      info = 8888
      call psb_errpush(info,name)
      goto 9999

    end select

    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    if (err_act.eq.psb_act_abort_) then
      call psb_error()
      return
    end if
    return

  end subroutine csr_dsp_regen

  subroutine coo_dsp_regen(a,info)

    use psb_spmat_type
    use psb_const_mod
    use psb_error_mod
    implicit none

    type(psb_dspmat_type), intent(inout)    :: a
    integer                              :: info

    integer :: i,j, k, ip1,ip2,nnz,iflag,ichk,nnzt
    real(kind(1.d0)), allocatable  :: work(:)
    integer :: err_act
    character(len=20)             :: name, ch_err
    logical, parameter :: debug=.false.

    name='psb_spcnv'
    info = 0
    call psb_erractionsave(err_act)


    !
    !   dupl_ and upd_ fields should not be changed. 
    !
    select case(psb_sp_getifld(psb_upd_,a,info))

    case(psb_upd_perm_)

      allocate(work(size(a%aspk)+1000),stat=info)
      if (info /= 0) then
        info=2040
        call psb_errpush(info,name)
        goto 9999
      end if

      if (debug) write(0,*) 'Regeneration with psb_upd_perm_'
      ip1   = psb_sp_getifld(psb_upd_pnt_,a,info) 
      ip2   = a%ia2(ip1+psb_ip2_)
      nnz   = a%ia2(ip1+psb_nnz_)
      iflag = a%ia2(ip1+psb_iflag_)
      ichk  = a%ia2(ip1+psb_ichk_)
      nnzt  = a%ia2(ip1+psb_nnzt_)
      if (debug) write(*,*) 'Regeneration start: ',&
           &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,info

      if ((ichk/=nnzt+iflag).or.(nnz/=nnzt)) then               
        info = 8889
        write(*,*) 'Regeneration start error: ',&
             &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,ichk    
        call psb_errpush(info,name)
        goto 9999
      endif
      do i= 1, nnz
        work(i) = dzero
      enddo
      select case(iflag) 
      case(psb_dupl_ovwrt_,psb_dupl_err_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) 
        enddo
      case(psb_dupl_add_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) + work(a%ia2(ip2+i-1)) 
        enddo
      case default
        info = 8887
        call psb_errpush(info,name)
        goto 9999          
      end select

      do i=1, nnz
        a%aspk(i) = work(i)
      enddo


    case(psb_upd_srch_)
      ! Nothing to be done  here. 
      if (debug) write(0,*) 'Going through on regeneration with psb_upd_srch_'
    case default
      ! Wrong value
      info = 8888
      call psb_errpush(info,name)
      goto 9999

    end select

    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    if (err_act.eq.psb_act_abort_) then
      call psb_error()
      return
    end if
    return

  end subroutine coo_dsp_regen

  subroutine jad_dsp_regen(a,info)

    use psb_spmat_type
    use psb_const_mod
    use psb_error_mod
    implicit none

    type(psb_dspmat_type), intent(inout)    :: a
    integer                              :: info

    integer :: i,j, k, ip1,ip2,nnz,iflag,ichk,nnzt
    real(kind(1.d0)), allocatable  :: work(:)
    integer :: err_act
    character(len=20)             :: name, ch_err
    logical, parameter :: debug=.false.

    name='psb_spcnv'
    info = 0
    call psb_erractionsave(err_act)


    !
    !   dupl_ and upd_ fields should not be changed. 
    !
    select case(psb_sp_getifld(psb_upd_,a,info))

    case(psb_upd_perm_)

      allocate(work(size(a%aspk)+1000),stat=info)
      if (info /= 0) then
        info=2040
        call psb_errpush(info,name)
        goto 9999
      end if

      if (debug) write(0,*) 'Regeneration with psb_upd_perm_'
      ip1   = psb_sp_getifld(psb_upd_pnt_,a,info) 
      ip2   = a%ia1(ip1+psb_ip2_)
      nnz   = a%ia1(ip1+psb_nnz_)
      iflag = a%ia1(ip1+psb_iflag_)
      ichk  = a%ia1(ip1+psb_ichk_)
      nnzt  = a%ia1(ip1+psb_nnzt_)
      if (debug) write(*,*) 'Regeneration start: ',&
           &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,info

      if ((ichk/=nnzt+iflag).or.(nnz/=nnzt)) then               
        info = 8889
        write(*,*) 'Regeneration start error: ',&
             &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,ichk    
        call psb_errpush(info,name)
        goto 9999
      endif
      do i= 1, nnz
        work(i) = dzero
      enddo
      select case(iflag) 
      case(psb_dupl_ovwrt_,psb_dupl_err_) 
        do i=1, nnz 
          work(a%ia1(ip2+i-1)) = a%aspk(i) 
        enddo
      case(psb_dupl_add_) 
        do i=1, nnz 
          work(a%ia1(ip2+i-1)) = a%aspk(i) + work(a%ia1(ip2+i-1)) 
        enddo
      case default
        info = 8887
        call psb_errpush(info,name)
        goto 9999          
      end select

      do i=1, nnz
        a%aspk(i) = work(i)
      enddo


    case(psb_upd_srch_)
      ! Nothing to be done  here. 
      if (debug) write(0,*) 'Going through on regeneration with psb_upd_srch_'
    case default
      ! Wrong value
      info = 8888
      call psb_errpush(info,name)
      goto 9999

    end select

    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    if (err_act.eq.psb_act_abort_) then
      call psb_error()
      return
    end if
    return

  end subroutine jad_dsp_regen


  
  subroutine csr_zsp_regen(a,info)

    use psb_spmat_type
    use psb_const_mod
    use psb_error_mod
    implicit none

    type(psb_zspmat_type), intent(inout)    :: a
    integer                              :: info

    integer :: i,j, k, ip1,ip2,nnz,iflag,ichk,nnzt
    complex(kind(1.d0)), allocatable  :: work(:)
    integer :: err_act
    character(len=20)             :: name, ch_err
    logical, parameter :: debug=.false.

    name='psb_spcnv'
    info = 0
    call psb_erractionsave(err_act)


    !
    !   dupl_ and upd_ fields should not be changed. 
    !
    select case(psb_sp_getifld(psb_upd_,a,info))

    case(psb_upd_perm_)

      allocate(work(size(a%aspk)+1000),stat=info)
      if (info /= 0) then
        info=2040
        call psb_errpush(info,name)
        goto 9999
      end if

      if (debug) write(0,*) 'Regeneration with psb_upd_perm_'
      ip1   = psb_sp_getifld(psb_upd_pnt_,a,info) 
      ip2   = a%ia2(ip1+psb_ip2_)
      nnz   = a%ia2(ip1+psb_nnz_)
      iflag = a%ia2(ip1+psb_iflag_)
      ichk  = a%ia2(ip1+psb_ichk_)
      nnzt  = a%ia2(ip1+psb_nnzt_)
      if (debug) write(*,*) 'Regeneration start: ',&
           &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,info

      if ((ichk/=nnzt+iflag).or.(nnz/=nnzt)) then               
        info = 8889
        write(*,*) 'Regeneration start error: ',&
             &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,ichk    
        call psb_errpush(info,name)
        goto 9999
      endif
      do i= 1, nnz
        work(i) = zzero
      enddo
      select case(iflag) 
      case(psb_dupl_ovwrt_,psb_dupl_err_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) 
        enddo
      case(psb_dupl_add_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) + work(a%ia2(ip2+i-1)) 
        enddo
      case default
        info = 8887
        call psb_errpush(info,name)
        goto 9999          
      end select

      do i=1, nnz
        a%aspk(i) = work(i)
      enddo


    case(psb_upd_srch_)
      ! Nothing to be done  here. 
      if (debug) write(0,*) 'Going through on regeneration with psb_upd_srch_'
    case default
      ! Wrong value
      info = 8888
      call psb_errpush(info,name)
      goto 9999

    end select

    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    if (err_act.eq.psb_act_abort_) then
      call psb_error()
      return
    end if
    return

  end subroutine csr_zsp_regen

  subroutine coo_zsp_regen(a,info)

    use psb_spmat_type
    use psb_const_mod
    use psb_error_mod
    implicit none

    type(psb_zspmat_type), intent(inout)    :: a
    integer                              :: info

    integer :: i,j, k, ip1,ip2,nnz,iflag,ichk,nnzt
    complex(kind(1.d0)), allocatable  :: work(:)
    integer :: err_act
    character(len=20)             :: name, ch_err
    logical, parameter :: debug=.false.

    name='psb_spcnv'
    info = 0
    call psb_erractionsave(err_act)


    !
    !   dupl_ and upd_ fields should not be changed. 
    !
    select case(psb_sp_getifld(psb_upd_,a,info))

    case(psb_upd_perm_)

      allocate(work(size(a%aspk)+1000),stat=info)
      if (info /= 0) then
        info=2040
        call psb_errpush(info,name)
        goto 9999
      end if

      if (debug) write(0,*) 'Regeneration with psb_upd_perm_'
      ip1   = psb_sp_getifld(psb_upd_pnt_,a,info) 
      ip2   = a%ia2(ip1+psb_ip2_)
      nnz   = a%ia2(ip1+psb_nnz_)
      iflag = a%ia2(ip1+psb_iflag_)
      ichk  = a%ia2(ip1+psb_ichk_)
      nnzt  = a%ia2(ip1+psb_nnzt_)
      if (debug) write(*,*) 'Regeneration start: ',&
           &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,info

      if ((ichk/=nnzt+iflag).or.(nnz/=nnzt)) then               
        info = 8889
        write(*,*) 'Regeneration start error: ',&
             &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,ichk    
        call psb_errpush(info,name)
        goto 9999
      endif
      do i= 1, nnz
        work(i) = zzero
      enddo
      select case(iflag) 
      case(psb_dupl_ovwrt_,psb_dupl_err_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) 
        enddo
      case(psb_dupl_add_) 
        do i=1, nnz 
          work(a%ia2(ip2+i-1)) = a%aspk(i) + work(a%ia2(ip2+i-1)) 
        enddo
      case default
        info = 8887
        call psb_errpush(info,name)
        goto 9999          
      end select

      do i=1, nnz
        a%aspk(i) = work(i)
      enddo


    case(psb_upd_srch_)
      ! Nothing to be done  here. 
      if (debug) write(0,*) 'Going through on regeneration with psb_upd_srch_'
    case default
      ! Wrong value
      info = 8888
      call psb_errpush(info,name)
      goto 9999

    end select

    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    if (err_act.eq.psb_act_abort_) then
      call psb_error()
      return
    end if
    return

  end subroutine coo_zsp_regen

  subroutine jad_zsp_regen(a,info)

    use psb_spmat_type
    use psb_const_mod
    use psb_error_mod
    implicit none

    type(psb_zspmat_type), intent(inout)    :: a
    integer                              :: info

    integer :: i,j, k, ip1,ip2,nnz,iflag,ichk,nnzt
    complex(kind(1.d0)), allocatable  :: work(:)
    integer :: err_act
    character(len=20)             :: name, ch_err
    logical, parameter :: debug=.false.

    name='psb_spcnv'
    info = 0
    call psb_erractionsave(err_act)


    !
    !   dupl_ and upd_ fields should not be changed. 
    !
    select case(psb_sp_getifld(psb_upd_,a,info))

    case(psb_upd_perm_)

      allocate(work(size(a%aspk)+1000),stat=info)
      if (info /= 0) then
        info=2040
        call psb_errpush(info,name)
        goto 9999
      end if

      if (debug) write(0,*) 'Regeneration with psb_upd_perm_'
      ip1   = psb_sp_getifld(psb_upd_pnt_,a,info) 
      ip2   = a%ia1(ip1+psb_ip2_)
      nnz   = a%ia1(ip1+psb_nnz_)
      iflag = a%ia1(ip1+psb_iflag_)
      ichk  = a%ia1(ip1+psb_ichk_)
      nnzt  = a%ia1(ip1+psb_nnzt_)
      if (debug) write(*,*) 'Regeneration start: ',&
           &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,info

      if ((ichk/=nnzt+iflag).or.(nnz/=nnzt)) then               
        info = 8889
        write(*,*) 'Regeneration start error: ',&
             &   a%infoa(psb_upd_),psb_upd_perm_,nnz,nnzt ,iflag,ichk    
        call psb_errpush(info,name)
        goto 9999
      endif
      do i= 1, nnz
        work(i) = zzero
      enddo
      select case(iflag) 
      case(psb_dupl_ovwrt_,psb_dupl_err_) 
        do i=1, nnz 
          work(a%ia1(ip2+i-1)) = a%aspk(i) 
        enddo
      case(psb_dupl_add_) 
        do i=1, nnz 
          work(a%ia1(ip2+i-1)) = a%aspk(i) + work(a%ia1(ip2+i-1)) 
        enddo
      case default
        info = 8887
        call psb_errpush(info,name)
        goto 9999          
      end select

      do i=1, nnz
        a%aspk(i) = work(i)
      enddo


    case(psb_upd_srch_)
      ! Nothing to be done  here. 
      if (debug) write(0,*) 'Going through on regeneration with psb_upd_srch_'
    case default
      ! Wrong value
      info = 8888
      call psb_errpush(info,name)
      goto 9999

    end select

    call psb_erractionrestore(err_act)
    return

9999 continue
    call psb_erractionrestore(err_act)
    if (err_act.eq.psb_act_abort_) then
      call psb_error()
      return
    end if
    return

  end subroutine jad_zsp_regen

  

end module psb_regen_mod