# shellcheck shell=bash
# varlinkctl(1) completion                           -*- shell-script -*-
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This file is part of systemd.
#
# 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 <https://www.gnu.org/licenses/>.

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

__get_interfaces() {
    local address=$1
    local a
    varlinkctl list-interfaces --no-pager "$address" 2>/dev/null |
        { while read -r a; do echo " $a"; done; }
}

__get_methods() {
    local address=$1
    local a
    varlinkctl list-methods --no-pager "$address" 2>/dev/null |
        { while read -r a; do echo " $a"; done; }
}

_varlinkctl() {
    local i n verb comps
    local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
    local -A OPTS=(
        [STANDALONE]='-h --help --version --no-pager -q --quiet
                      --oneway --collect --more --exec -j -E'
        [ARG]='--graceful --timeout --push-fd --json'
    )

    if __contains_word "$prev" ${OPTS[ARG]}; then
        case $prev in
            --json)
                comps=$( varlinkctl --json=help 2>/dev/null )
                ;;
        esac
        COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
        return 0
    fi

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

    local -A VERBS=(
        [STANDALONE]='help'
        [CALL]='call'
        [FILE]='info list-interfaces validate-idl'
        [ADDRESS_INTERFACES]='list-methods introspect'
    )

    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" ${VERBS[FILE]}; then
        comps=$(compgen -f -- "$cur")
        compopt -o filenames
    elif __contains_word "$verb" ${VERBS[ADDRESS_INTERFACES]}; then
        if [[ $n -eq 1 ]] ; then
            comps=$(compgen -f -- "$cur")
            compopt -o filenames
        elif [[ $n -eq 2 ]] ; then
            comps=$( __get_interfaces ${COMP_WORDS[COMP_CWORD-1]})
        else
            comps=''
        fi
    elif __contains_word "$verb" ${VERBS[CALL]}; then
        if [[ $n -eq 1 ]] ; then
            comps=$(compgen -f -- "$cur")
            compopt -o filenames
        elif [[ $n -eq 2 ]] ; then
            comps=$( __get_methods ${COMP_WORDS[COMP_CWORD-1]})
        elif [[ $n -eq 3 ]] ; then
            comps="'{}'"
        elif [[ ${COMP_WORDS[COMP_CWORD-1]} == "--" ]] && __contains_word "--exec" ${COMP_WORDS[*]} ; then
            comps=$(compgen -c -- "$cur")
        else
            comps=''
        fi
    fi

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

complete -F _varlinkctl varlinkctl
