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# This file is part of systemd.
#
# Copyright 2010 Ran Benita
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# systemd is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with systemd; If not, see <http://www.gnu.org/licenses/>.

__systemctl() {
        local mode=$1; shift 1
        systemctl $mode --full --no-legend "$@"
}

__systemd_properties() {
        local mode=$1
        { __systemctl -a $mode show;
         systemd --dump-configuration-items; } |
        while IFS='=' read -r key value; do
            [[ $value ]] && echo "$key"
        done
}
__contains_word () {
        local w word=$1; shift
        for w in "$@"; do
                [[ $w = "$word" ]] && return
        done
}

__filter_units_by_property () {
        local mode=$1 property=$2 value=$3 ; shift 3
        local units=("$@")
        local props
        IFS=$'\n' read -rd '' -a props < \
            <(__systemctl $mode show --property "$property" -- "${units[@]}")
        for ((i=0; $i < ${#units[*]}; i++)); do
                if [[ "${props[i]}" = "$property=$value" ]]; then
                        echo " ${units[i]}"
                fi
        done
}

__get_all_units      () { __systemctl $1 list-units --all \
        | { while read -r a b; do echo " $a"; done; }; }
__get_active_units   () { __systemctl $1 list-units       \
        | { while read -r a b; do echo " $a"; done; }; }
__get_startable_units () { __systemctl $1 list-units --all -t service,timer,socket,mount,automount,path,snapshot,swap \
        | { while read -r a b c d; do [[ $c == "inactive" || $c == "failed" ]] && echo " $a"; done; }; }
__get_failed_units   () { __systemctl $1 list-units       \
        | { while read -r a b c d; do [[ $c == "failed"   ]] && echo " $a"; done; }; }
__get_enabled_units  () { __systemctl $1 list-unit-files  \
        | { while read -r a b c  ; do [[ $b == "enabled"  ]] && echo " $a"; done; }; }
__get_disabled_units () { __systemctl $1 list-unit-files  \
        | { while read -r a b c  ; do [[ $b == "disabled" ]] && echo " $a"; done; }; }
__get_masked_units   () { __systemctl $1 list-unit-files  \
        | { while read -r a b c  ; do [[ $b == "masked"   ]] && echo " $a"; done; }; }

_systemctl () {
        local i verb comps mode cur prev
        _get_comp_words_by_ref cur prev
        local OPTS_STANDALONE='--all -a --reverse --after --before --defaults --fail --ignore-dependencies --failed --force -f --full --global
               --help -h --no-ask-password --no-block --no-legend --no-pager --no-reload --no-wall
               --quiet -q --privileged -P --system --user --version --runtime'
        local OPTS_ARG='--host -H --kill-who --property -p --signal -s --type -t --state --root'

        if __contains_word "--user" $COMP_WORDS; then
            mode=--user
        else
            mode=--system
        fi

        if __contains_word "$prev" "$OPTS_ARG"; then
                case $prev in
                        --signal|-s)
                                comps=$(compgen -A signal)
                        ;;
                        --type|-t)
                                comps='automount device mount path service snapshot socket swap target timer'
                        ;;
                        --state)
                                comps='loaded not-found stub
                                       active inactive
                                       dead elapsed exited listening mounted plugged running waiting'
                        ;;
                        --kill-who)
                                comps='all control main'
                        ;;
                        --root)
                                comps=$(compgen -o filenames -A directory -- "$cur" )
                        ;;
                        --host|-H)
                                comps=$(compgen -A hostname)
                        ;;
                        --property|-p)
                                comps=$(__systemd_properties $mode)
                        ;;

                esac
                COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
                return 0
        fi


        if [[ "$cur" = -* ]]; then
                COMPREPLY=( $(compgen -W '$OPTS_ARG $OPTS_STANDALONE' -- "$cur") )
                return 0
        fi

        local VERBS_ALL_UNITS='is-active is-failed is-enabled status show cat mask preset help list-dependencies'
        local VERBS_ENABLED_UNITS='disable'
        local VERBS_DISABLED_UNITS='enable'
        local VERBS_REENABLABLE_UNITS='reenable'
        local VERBS_FAILED_UNITS='reset-failed'
        local VERBS_STARTABLE_UNITS='start'
        local VERBS_STOPPABLE_UNITS='stop condstop kill try-restart condrestart'
        local VERBS_ISOLATABLE_UNITS='isolate'
        local VERBS_RELOADABLE_UNITS='reload condreload reload-or-try-restart force-reload'
        local VERBS_RESTARTABLE_UNITS='restart reload-or-restart'
        local VERBS_MASKED_UNITS='unmask'
        local VERBS_JOBS='cancel'
        local VERBS_SNAPSHOTS='delete'
        local VERBS_ENVS='set-environment unset-environment'
        local VERBS_STANDALONE='daemon-reexec daemon-reload default
                                emergency exit halt hibernate hybrid-sleep kexec list-jobs
                                list-sockets list-timers list-units list-unit-files poweroff
                                reboot rescue show-environment suspend get-default'
        local VERBS_NAME='snapshot'
        local VERBS_FILE='link'
        local VERBS="$VERBS_ALL_UNITS $VERBS_FAILED_UNITS $VERBS_STARTABLE_UNITS $VERBS_ENABLED_UNITS $VERBS_DISABLED_UNITS $VERBS_REENABLABLE_UNITS
                $VERBS_STOPPABLE_UNITS $VERBS_ISOLATABLE_UNITS $VERBS_RELOADABLE_UNITS
                $VERBS_JOBS $VERBS_SNAPSHOTS $VERBS_ENVS $VERBS_STANDALONE $VERBS_NAME"

        local verb
        for ((i=0; i < COMP_CWORD; i++)); do
                if __contains_word "${COMP_WORDS[i]}" "$VERBS" &&
                 ! __contains_word "${COMP_WORDS[i-1]}" "$OPTS_ARG"; then
                        verb=${COMP_WORDS[i]}
                        break
                fi
        done

        if [[ -z $verb ]]; then
                comps="$VERBS"

        elif __contains_word "$verb" "$VERBS_ALL_UNITS"; then
                comps=$( __get_all_units $mode )

        elif __contains_word "$verb" "$VERBS_ENABLED_UNITS"; then
                comps=$( __get_enabled_units $mode )

        elif __contains_word "$verb" "$VERBS_DISABLED_UNITS"; then
                comps=$( __get_disabled_units $mode )


        elif __contains_word "$verb" $VERBS_REENABLABLE_UNITS; then
                comps=$( __get_disabled_units $mode;
                         __get_enabled_units $mode )

        elif __contains_word "$verb" "$VERBS_STARTABLE_UNITS"; then
                comps=$( __filter_units_by_property $mode CanStart yes \
                      $( __get_startable_units $mode))

        elif __contains_word "$verb" "$VERBS_RESTARTABLE_UNITS"; then
                comps=$( __filter_units_by_property $mode CanStart yes \
                      $( __get_all_units $mode \
                        | while read -r line; do \
                                [[ "$line" =~ \.(device|snapshot|socket|timer)$ ]] || echo " $line"; \
                        done ))

        elif __contains_word "$verb" "$VERBS_STOPPABLE_UNITS"; then
                comps=$( __filter_units_by_property $mode CanStop yes \
                      $( __get_active_units $mode ) )

        elif __contains_word "$verb" "$VERBS_RELOADABLE_UNITS"; then
                comps=$( __filter_units_by_property $mode CanReload yes \
                      $( __get_active_units $mode ) )

        elif __contains_word "$verb" "$VERBS_ISOLATABLE_UNITS"; then
                comps=$( __filter_units_by_property $mode AllowIsolate yes \
                      $( __get_all_units $mode ) )

        elif __contains_word "$verb" "$VERBS_FAILED_UNITS"; then
                comps=$( __get_failed_units $mode )

        elif __contains_word "$verb" "$VERBS_MASKED_UNITS"; then
                comps=$( __get_masked_units $mode )

        elif __contains_word "$verb" "$VERBS_STANDALONE" "$VERBS_NAME"; then
                comps=''

        elif __contains_word "$verb" "$VERBS_JOBS"; then
                comps=$( __systemctl $mode list-jobs | { while read -r a b; do echo " $a"; done; } )

        elif __contains_word "$verb" "$VERBS_SNAPSHOTS"; then
                comps=$( __systemctl $mode list-units --type snapshot --full --all \
                        | { while read -r a b; do echo " $a"; done; } )

        elif __contains_word "$verb" "$VERBS_ENVS"; then
                comps=$( __systemctl $mode show-environment \
                    | while read -r line; do echo " ${line%%=*}=";done )

        elif __contains_word "$verb" "$VERBS_FILE"; then
                comps=$( compgen -o filenames -A file -- "$cur" )

        fi

        COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
        return 0
}
complete -F _systemctl systemctl