module write_snapshot_m

  implicit none

contains

  subroutine write_snapshot(list, hshpc_cyclo, hshpc_anti, date)

    ! Libraries:
    use shapelib_03, only: shp_get_info_03

    use derived_types, only: eddy, shpc_slice_handler
    use write_eddy_m, only: write_eddy

    type(eddy), intent(in):: list(:)
    ! In general, there may be both cyclonic and anticyclonic eddies
    ! in the list. Eddies include "eddies" without an outermost
    ! contour, that is, only the extremum is defined.

    TYPE(shpc_slice_handler), intent(in):: hshpc_cyclo, hshpc_anti
    integer, intent(in):: date

    ! Local:
    integer i, n_cyclo, n_anti, n_entities

    !-----------------------------------------------------------------

    n_cyclo = 0
    n_anti = 0

    do i = 1, size(list)
       if (list(i)%out_cont%closed) then
          if (list(i)%cyclone) then
             n_cyclo = n_cyclo + 1
             call write_eddy(list(i), hshpc_cyclo, date, n_cyclo)
          else
             n_anti = n_anti + 1
             call write_eddy(list(i), hshpc_anti, date, n_anti)
          end if
       end if
    end do

    call shp_get_info_03(hshpc_cyclo%extremum, n_entities)
    write(hshpc_cyclo%unit, fmt = *) n_entities - 1
    call shp_get_info_03(hshpc_anti%extremum, n_entities)
    write(hshpc_anti%unit, fmt = *) n_entities - 1

  end subroutine write_snapshot

end module write_snapshot_m