#compdef openstack aodh barbican ceilometer cinder cloudkitty designate freezer glance gnocchi heat ironic keystone magnum manila mistral monasca murano neutron nova sahara senlin tacker trove vitrage watcher zun

# https://wiki.openstack.org/wiki/OpenStackClients
# http://docs.openstack.org/user-guide/common/cli-install-openstack-command-line-clients.html

local curcontext="$curcontext" state line expl ret=1

local -a clnts_compl_new clnts_compl_old clnts_swift_like

#
# We support three different client categories:
#  1) Clients with new style complete command where output is like:
#
#    cmds='alarm alarm-history capabilities complete help'
#    cmds_alarm='create delete list show update'
#    cmds_alarm_history='search show'
#    cmds_alarm_history_search='-h --help -f --format -c --column --max-width --noindent --quote --query'
#
#  2) Clients with old style bash-completion command which does
#     not separate options and commands:
#
#    --tenant_id floatingip-delete bgp-peer-delete --default-prefixlen net-create [...]
#
#  3) Swift, slightly different from 2)
#
clnts_compl_new=( aodh barbican designate freezer gnocchi openstack vitrage watcher )
clnts_compl_old=( ceilometer cinder cloudkitty glance heat ironic keystone magnum manila mistral monasca murano neutron nova sahara senlin tacker trove zun )
clnts_swift_like=( swift )

# Python clients take quite some time to start up and some (openstack(1))
# even go over the network for completions so we cache things pretty hard
if (( ! $+_cache_openstack_clnt_opts )); then
  typeset -gA _cache_openstack_clnt_outputs
  typeset -gA _cache_openstack_clnt_opts
  typeset -gA _cache_openstack_clnt_cmds
  typeset -gA _cache_openstack_clnt_cmds_opts
fi

local -a conn_opts
local opt arg word
# Only openstack(1) requires parameters to provide completion info
if [[ $service == openstack && -n ${words[(r)--os-*]} ]]; then
  if (( ! $+_cache_openstack_conn_opts )); then
    _cache_openstack_conn_opts=( ${(M)${=${(f)"$($service help 2>/dev/null)"}}:#--os-*} )
  fi
  # --os-tenant-id --os-tenant-name are deprecated but still widely used
  for opt in ${=_cache_openstack_conn_opts} --os-tenant-id --os-tenant-name; do
    arg=
    for word in ${words:1}; do
      [[ $word == $opt ]] && arg=$word && break
    done
    [[ -n $arg && -n ${arg##-*} ]] && conn_opts=( $conn_opts $opt $arg )
  done
fi

# New style clients
if [[ -n ${clnts_compl_new[(r)$service]} ]]; then
  if [[ -z $_cache_openstack_clnt_cmds[$service] ]]; then
    # Populate caches - clnt_outputs is command raw output used later
    _cache_openstack_clnt_outputs[$service]=${:-"$($service ${(Q)conn_opts} complete 2>/dev/null)"}
    _cache_openstack_clnt_opts[$service]=${${${${(M)${${${${=${(f)"$($service help 2>/dev/null)"}}/\[}/\]}/\;}:#-[-0-9A-Za-z]*}/,}/\.}%--os-}
  fi

  # get worlds left of the curser into an array
  local -a left_words
  left_words=(${=LBUFFER})

  # if curser is directly at a word (no space at the end),
  # exclude the last word to offer right matches
  # the last word could be a partial match that is later checked (prefix-needed)
  local partial=""
  if [[ "${LBUFFER[-1]}" != " " ]]; then
    partial=${(@)left_words[-1]}
    left_words=(${(@)left_words[1,$#left_words-1]})
  fi
  # remove $service
  left_words=(${left_words:1})

  # filter out "help"
  if [[ $left_words[1] == help ]]; then
    left_words=(${(@)left_words[2,$#left_words]})
  fi

  # filter out options (-*)
  left_words=(${left_words//-*})

  local -a subcmd_array cmds_array cache_key_array cache_values
  subcmd_array=()
  cmds_array=(cmds)
  cache_key_array=(${service})
  cache_values=()
  local cache_key cmds
  cache_key=""
  cmds=""

  # Check for matches one level at a time
  # example: "" server create
  for word in "" ${(@)left_words}; do                   # first loop  second loop        third loop
    subcmd_array=(${(@)subcmd_array} ${word})           # ()          (server)           (server create)
    cmds_array=(${(@)cmds_array} ${word})               # (cmds)      (cmds server)      (cmds server create)
    cmds=${${(j:_:)cmds_array}/-/_}                     #  cmds        cmds_openstack     cmds_server_create
    cache_key_array=(${(@)cache_key_array} ${word})     # (openstack) (openstack server) (openstack server create)
    cache_key=${${(j:_:)cache_key_array}/-/_}           #  openstack   openstack_server   openstack_server_create

    # lookup if current word is in cache_values of last elements
    if [[ ${cache_values[(wI)${word}]} -gt 0 || $word == "" ]]; then
      _cache_openstack_clnt_cmds[${cache_key}]=${${${_cache_openstack_clnt_outputs[${service}]}/* ${cmds}=\'}/\'*}
    else
      # unknown word: set cache_key to last cache_key and break
      cache_key=${${(j:_:)${cache_key_array:0:${#cache_key_array}-1}}/-/_}
      break
    fi
    # set cache_values for next loop
    cache_values=${_cache_openstack_clnt_cmds[${cache_key}]}
  done

  # Populate the command cache
  if [[ -z $_cache_openstack_clnt_cmds[${cache_key}] ]]; then
    _message "missing authentication options"
  else
    # add global options to completion list if current word start with -*
    local extra_opts
    if [[ $words[CURRENT] == -* ]]; then;
      extra_opts=${_cache_openstack_clnt_opts[$service]}
    fi

    { ! zstyle -T ":completion:${curcontext}:options" prefix-needed \
          || [[ -n "${partial}" && ${${_cache_openstack_clnt_cmds[${cache_key}]}[(Iw)${partial}*]} -gt 0 || -prefix - ]] } \
      && _values -w option ${(u)=_cache_openstack_clnt_cmds[${cache_key}]} ${(u)=extra_opts} \
      && ret=0
  fi


# Old style clients
elif [[ -n ${clnts_compl_old[(r)$service]} ]]; then
  if [[ -z $_cache_openstack_clnt_cmds[$service] ]]; then
    # Populate caches
    _cache_openstack_clnt_opts[$service]=${${${(M)${${${${=${(f)"$($service help 2>/dev/null)"}}/\[}/\]}/\;}:#-[-0-9A-Za-z]*}/,}/\.}
    _cache_openstack_clnt_cmds[$service]=${${(M)${=${(f)"$($service bash-completion 2>/dev/null)"}}:#[A-Za-z]*}/bash-completion}
  fi
  local cmd
  # Determine the command
  for word in ${words:1}; do
    local s=${_cache_openstack_clnt_cmds[$service]}
    [[ $s[(wI)$word] -gt 0 ]] && cmd=$word && break
  done
  # Populate command option cache
  # Mostly no options for help, prevent consecutive calls with help here
  if [[ -n $cmd && $cmd != help && -z $_cache_openstack_clnt_cmds_opts[$service$cmd] ]]; then
    _cache_openstack_clnt_cmds_opts[$service$cmd]=${${${(M)${${${${=${(f)"$($service help $cmd 2>/dev/null)"}}/\[}/\]}/\;}:#-[-0-9A-Za-z]*}/,}/\.}
  fi
  # Special treatment for the help command
  if [[ $cmd == help ]]; then
      if [[ $words[CURRENT-1] == help && $words[CURRENT] != -* ]]; then
        _values -w option ${(u)=_cache_openstack_clnt_cmds[$service]} && ret=0
      else
        _values -w option help && ret=0
      fi
  # Client options
  elif [[ -z $cmd && $words[CURRENT] == -* ]]; then
    _values -w option ${(u)=_cache_openstack_clnt_opts[$service]} && ret=0
  # Commands
  elif [[ -z $cmd ]]; then
    _values -w option ${(u)=_cache_openstack_clnt_cmds[$service]} && ret=0
  # Command options
  else
    { ! zstyle -T ":completion:${curcontext}:options" prefix-needed || [[ -prefix - ]] } && \
      [[ -n $_cache_openstack_clnt_cmds_opts[$service$cmd] ]] && _values -w option ${(u)=_cache_openstack_clnt_cmds_opts[$service$cmd]//\:/\\\:} && ret=0
  fi

# Swift like clients
elif [[ -n ${clnts_swift_like[(r)$service]} ]]; then
  if [[ -z $_cache_openstack_clnt_cmds[$service] ]]; then
    # Populate caches - clnt_outputs is command raw output used later
    _cache_openstack_clnt_outputs[$service]=${(f)"$($service --help 2>/dev/null)"}
    _cache_openstack_clnt_opts[$service]=${${${${(M)${${${${=_cache_openstack_clnt_outputs[$service]}/\[}/\]}/\;}:#-[-0-9A-Za-z]*}/,}/\.}/=*}
    _cache_openstack_clnt_cmds[$service]=${=${(M)${(M)${(f)_cache_openstack_clnt_outputs[$service]}:#    [a-z]*}/ [A-Z]*}}
  fi
  local cmd
  # Determine the command
  for word in ${words:1}; do
    local s=${_cache_openstack_clnt_cmds[$service]}
    [[ $s[(wI)$word] -gt 0 ]] && cmd=$word && break
  done
  # Populate command option cache
  if [[ -n $cmd && -z $_cache_openstack_clnt_cmds_opts[$service$cmd] ]]; then
    _cache_openstack_clnt_cmds_opts[$service$cmd]=${${${(M)${${${${=${(f)"$($service $cmd --help 2>/dev/null)"}}/\[}/\]}/\;}:#-[-0-9A-Za-z]*}/,}/\.}
  fi
  # Client options
  if [[ -z $cmd && $words[CURRENT] == -* ]]; then
    _values -w option ${(u)=_cache_openstack_clnt_opts[$service]} && ret=0
  # Commands
  elif [[ -z $cmd ]]; then
    _values -w option ${(u)=_cache_openstack_clnt_cmds[$service]} && ret=0
  # Command options
  else
    { ! zstyle -T ":completion:${curcontext}:options" prefix-needed || [[ -prefix - ]] } && \
      [[ -n $_cache_openstack_clnt_cmds_opts[$service$cmd] ]] && _values -w option ${(u)=_cache_openstack_clnt_cmds_opts[$service$cmd]//\:/\\\:} && ret=0
  fi

fi

return ret