#compdef telnet

# Parameter used:
#
#  telnet_hosts_ports_users
#    The array that contains 3-tuples `host:port:user'.

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

if (( ! $+_telnet_args )); then
  local help="$(_call_program options telnet -\? < /dev/null 2>&1)"
  local -A optionmap
  optionmap=(
    '*\[-8\]*' '-8[allow 8-Bit data]'
    '*\[-E\]*' '-E[disable an escape character]'
    '*\[-K\]*' '-K[no automatic login]'
    '*\[-L\]*' '-L[allow 8-Bit data on output]'
    '*\[-N\]*' '-N[suppress reverse lookup]'
    '*\[-S tos\]*' '-S+:IP type-of-service:'
    '*\[-X atype\]*' '-X+:authentication type to disable:'
    '*\[-a\]*' '-a[attempt automatic login]'
    '*\[-c\]*' '-c[disable .telnetrc]'
    '*\[-d\]*' '-d[debug mode]'
    '*\[-e char\]*' '-e+[specify escape character]:escape character:'
    '*\[-f/*' '-f'
    '*/-F\]*' '-F'
    '*\[-k realm\]*' '-k+:realm:'
    '*\[-l user\]*' '-l+[specify user]:user:->users'
    '*\[-n tracefile\]*' '-n+[specify tracefile]:tracefile:_files'
    '*\[-r\]*' '-r[rlogin like user interface]'
    '*\[-s src_addr\]*' '-s+[set source IP address]:src_addr:'
    '*\[-x\]*' '-x'
    '*\[-t transcom\]*' '-t+:transcom:'
    '*\[-noasynch\]*' '-noasynch'
    '*\[-noasyncnet\]*' '-noasyncnet'
    '*\[-noasynctty\]*' '-noasynctty'
  )
  _telnet_args=($optionmap[(K)"$help"])
  (( $#_telnet_args )) || _telnet_args=( '-l+[specify user]:user:->users' )
fi

_arguments -C -s \
  "$_telnet_args[@]" \
  ':host:->hosts' \
  ':port:->ports' && ret=0

case "$state" in
hosts)
  _wanted hosts expl host \
      _combination -s '[@:]' '' users-hosts-ports \
          ${opt_args[-l]:+users=${opt_args[-l]:q}} \
          hosts - && ret=0
  ;;

ports)
  _wanted ports expl port \
      _combination -s '[@:]' '' users-hosts-ports \
          ${opt_args[-l]:+users=${opt_args[-l]:q}} \
          hosts="${line[1]:q}" \
          ports - && ret=0
  ;;

users)
  _wanted users expl user \
      _combination -s '[@:]' '' users-hosts-ports \
      ${line[2]:+hosts="${line[2]:q}"} \
      ${line[3]:+ports="${line[3]:q}"} \
      users - && ret=0
  ;;
esac

return ret