#compdef nettop

local curcontext="$curcontext" state state_descr line ret=1
typeset -A opt_args

local msg='number of samples (0=infinite)'
local specs=(
  '-m+[specify the mode]:mode:(tcp udp route)'
  '*-t+[specify interface type]:interface type:(wifi wired loopback owdl expensive undefined external)'
  '-n[disable address to name resolution]'
  '-c[less intensive use of the CPU]'
  '-d[delta mode]'
  '-x[extended display of numbers instead of suffixes such as MiB]'
  '-P[display per-process summaries only]'
  '-s+[specify delay between updates]: :_numbers -u seconds -d 1 delay'
  "(-L)-l+[display specified number of samples and exit]:$msg"
  "(-l)-L+[display specified number of samples in CSV and exit]:$msg"
  '*-p+[select a particular process]: :->process'
  '-j+[include the specified columns]: :->columns-off'
  '-J+[include only the specified columns]: :->columns-all'
  '-k+[exclude the specified columns]: :->columns-on'
  '(-)-h[display help message and exit]'
)

_arguments -s -C : $specs && ret=0

case $state in
  columns-*)
    local columns_on=(	# columns included by default
      interface state bytes_in bytes_out rx_dupe rx_ooo re-tx rtt_avg
      rcvsize tx_win tc_class tc_mgt cc_algo P C R W
      arch
    )
    local columns_off=(	# not included by default
      type packets_in packets_out rtt_min rtt_var
      sndsize sndused rcvused unacked tx_cwin
      cell_bytes_in cell_bytes_out wifi_bytes_in wifi_bytes_out
      wired_bytes_in wired_bytes_out
      uuid epid euuid vuuid closed_tcp closed_udp
    )
    case $state in
      columns-on)
	_values -s , 'column name' $columns_on && ret=0
	;;
      columns-off)
	_values -s , 'column name' $columns_off && ret=0
	;;
      columns-all)
	_values -s , 'column name' $columns_on $columns_off && ret=0
	;;
    esac
    ;;
  process)
    local procs=( ${(@)${(f@)"$(_call_program processes-names
			        $words[1] -P -l 1 -J '')"}%.[0-9]*} )
    _alternative 'processes-names:process name:($procs)' \
		 'processes:pid:_pids' && ret=0
esac

return ret