# 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/>.

__contains_word() {
        local w word=$1; shift
        for w in "$@"; do
                [[ $w = "$word" ]] && return
        done
}

__get_all_sessions () { loginctl --no-legend list-sessions | { while read -r a b; do echo " $a"; done; } ; }
__get_all_users    () { loginctl --no-legend list-users    | { while read -r a b; do echo " $b"; done; } ; }
__get_all_seats    () { loginctl --no-legend list-seats    | { while read -r a b; do echo " $a"; done; } ; }

_loginctl () {
        local i verb comps cur prev
        _get_comp_words_by_ref cur prev

        local OPTS_STANDALONE='--all -a --help -h --no-pager --privileged -P --version'
        local OPTS_ARG='--host -H --kill-who --property -p --signal -s'

        if __contains_word "$prev" "$OPTS_ARG"; then
                case $prev in
                        --signal|-s)
                                comps=$(compgen -A signal)
                        ;;
                        --kill-who)
                                comps='all leader'
                        ;;
                        --host|-H)
                                comps=$(compgen -A hostname)
                        ;;
                        --property|-p)
                                comps=''
                        ;;
                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_SESSIONS='session-status show-session activate lock-session unlock-session terminate-session kill-session'
        local VERBS_USERS='user-status show-user enable-linger disable-linger terminate-user kill-user'
        local VERBS_SEATS='seat-status show-seat terminate-seat'
        local VERBS_STANDALONE='list-sessions list-users list-seats flush-devices'
        local VERBS_ATTACH='attach'
        local VERBS="$VERBS_SESSIONS $VERBS_USERS $VERBS_SEATS $VERBS_STANDALONE $VERBS_ATTACH"

        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_SESSIONS"; then
                comps=$( __get_all_sessions )

        elif __contains_word "$verb" "$VERBS_USERS"; then
                comps=$( __get_all_users )

        elif __contains_word "$verb" "$VERBS_SEATS"; then
                comps=$( __get_all_seats )

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

        elif __contains_word "$verb" $VERBS_ATTACH; then
                if [[ $prev = $verb ]]; then
                        comps=$( __get_all_seats )
                else
                        comps=$(compgen -o filenames -A file -- "$cur" )
                fi
        fi

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