# busctl(1) completion                               -*- shell-script -*-
#
# This file is part of systemd.
#
# Copyright 2013 Zbigniew Jędrzejewski-Szmek
# Copyright 2014 Thomas H.P. Andersen
#
# 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_machines() {
        local a b
        machinectl list --no-legend --no-pager | { while read a b; do echo " $a"; done; };
}

__get_busnames() {
        local mode=$1
        local a b
        busctl $mode list --no-legend --no-pager | { while read a b; do echo " $a"; done; };
}

__get_objects() {
        local mode=$1
        local busname=$2
        local a b
        busctl $mode tree --list --no-legend --no-pager $busname | { while read a b; do echo " $a"; done; };
}

__get_interfaces() {
        local mode=$1
        local busname=$2
        local path=$3
        local a b
        busctl $mode introspect --list --no-legend --no-pager $busname $path | { while read a b c; do [[ "$b" == "interface" ]] && echo " $a"; done; };
}

__get_members() {
        local mode=$1
        local busname=$2
        local path=$3
        local interface=$4
        local type=$5
        local a b
        busctl $mode introspect --list --no-legend --no-pager $busname $path $interface | sed -e 's/^\.//' | { while read a b c; do [[ "$b" == "$type" ]] && echo " $a"; done; };
}

__get_signature() {
        local mode=$1
        local busname=$2
        local path=$3
        local interface=$4
        local member=$5
        local a b
        busctl $mode introspect --list --no-legend --no-pager $busname $path $interface | sed -e 's/^\.//' | { while read a b c d; do [[ "$a" == "$member" ]] && echo " \"$c\""; done; };
}

_busctl() {
        local i verb comps mode
        local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
        local -A OPTS=(
               [STANDALONE]='-h --help --version --no-pager --no-legend --system
                             --show-machine --unique --acquired --activatable --list
                             --quiet --verbose --expect-reply=no --auto-start=no
                             --allow-interactive-authorization=yes --augment-creds=no'
                      [ARG]='-H --host -M --machine --address --match --timeout'
        )

        if __contains_word "--user" ${COMP_WORDS[*]}; then
                mode=--user
        else
                mode=--system
        fi

        if __contains_word "$prev" ${OPTS[ARG]}; then
                case $prev in
                        --host|-H)
                                comps=$(compgen -A hostname)
                        ;;
                        --machine|-M)
                                comps=$( __get_machines )
                esac
                COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
                return 0
        fi

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

        local -A VERBS=(
                [STANDALONE]='list help'
                [BUSNAME]='status monitor capture tree'
                [OBJECT]='introspect'
                [METHOD]='call'
                [PROPERTY_GET]='get-property'
                [PROPERTY_SET]='set-property'
        )

        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

        n=$(($COMP_CWORD - $i))

        if [[ -z $verb ]]; then
                comps=${VERBS[*]}
        elif __contains_word "$verb" ${VERBS[STANDALONE]}; then
                comps=''
        elif __contains_word "$verb" ${VERBS[BUSNAME]}; then
                comps=$( __get_busnames $mode)
        elif __contains_word "$verb" ${VERBS[OBJECT]}; then
                if [[ $n -eq 1 ]] ; then
                        comps=$( __get_busnames $mode)
                elif [[ $n -eq 2 ]] ; then
                        comps=$( __get_objects $mode ${COMP_WORDS[COMP_CWORD-1]})
                elif [[ $n -eq 3 ]] ; then
                        comps=$( __get_interfaces $mode ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]})
                else
                        comps=''
                fi
        elif __contains_word "$verb" ${VERBS[METHOD]}; then
                if [[ $n -eq 1 ]] ; then
                        comps=$( __get_busnames $mode)
                elif [[ $n -eq 2 ]] ; then
                        comps=$( __get_objects $mode ${COMP_WORDS[COMP_CWORD-1]})
                elif [[ $n -eq 3 ]] ; then
                        comps=$( __get_interfaces $mode ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]})
                elif [[ $n -eq 4 ]] ; then
                        comps=$( __get_members $mode ${COMP_WORDS[COMP_CWORD-3]} ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]} method)
                elif [[ $n -eq 5 ]] ; then
                        comps=$( __get_signature $mode ${COMP_WORDS[COMP_CWORD-4]} ${COMP_WORDS[COMP_CWORD-3]} ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]})
                else
                        comps=''
                fi
        elif __contains_word "$verb" ${VERBS[PROPERTY_GET]}; then
                if [[ $n -eq 1 ]] ; then
                        comps=$( __get_busnames $mode)
                elif [[ $n -eq 2 ]] ; then
                        comps=$( __get_objects $mode ${COMP_WORDS[COMP_CWORD-1]})
                elif [[ $n -eq 3 ]] ; then
                        comps=$( __get_interfaces $mode ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]})
                elif [[ $n -eq 4 ]] ; then
                        comps=$( __get_members $mode ${COMP_WORDS[COMP_CWORD-3]} ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]} property)
                else
                        comps=''
                fi
        elif __contains_word "$verb" ${VERBS[PROPERTY_SET]}; then
                if [[ $n -eq 1 ]] ; then
                        comps=$( __get_busnames $mode)
                elif [[ $n -eq 2 ]] ; then
                        comps=$( __get_objects $mode ${COMP_WORDS[COMP_CWORD-1]})
                elif [[ $n -eq 3 ]] ; then
                        comps=$( __get_interfaces $mode ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]})
                elif [[ $n -eq 4 ]] ; then
                        comps=$( __get_members $mode ${COMP_WORDS[COMP_CWORD-3]} ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]} property)
                elif [[ $n -eq 5 ]] ; then
                        comps=$( __get_signature $mode ${COMP_WORDS[COMP_CWORD-4]} ${COMP_WORDS[COMP_CWORD-3]} ${COMP_WORDS[COMP_CWORD-2]} ${COMP_WORDS[COMP_CWORD-1]})
                else
                        comps=''
                fi
        fi

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

complete -F _busctl busctl
