@AccessControl.authorizationCheck: #NOT_REQUIRED
@EndUserText.label: 'Vending machine state'
define view entity {{P}}I_VEND_STATE
  as select from {{p}}vmach as machine
    inner join   {{p}}vslot as slot on slot.machine_id = machine.machine_id
{
  key machine.machine_id                                     as machine_id,
      upper( machine.location )                              as location,
      count( * )                                             as slot_count,
      cast( sum( case when slot.fill_level = 0
                      then 1
                      else 0
                 end ) as abap.int4 )                        as empty_slots,
      division( sum( slot.fill_level ) * 100,
                sum( slot.max_units ), 1 )                   as fill_rate,
      case
        when sum( slot.fill_level ) = 0 then 'EMPTY'
        when division( sum( slot.fill_level ) * 100,
                       sum( slot.max_units ), 1 ) < 25 then 'LOW'
        else 'OK'
      end                                                    as status
}
group by
  machine.machine_id,
  machine.location