# shellcheck shell=bash
# ptyctl(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_ptys() {
    local mode=$1
    ptyctl "$mode" --quiet list 2>/dev/null | awk 'NR > 1 { print $1 }'
}

_ptyctl() {
    local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} words cword
    local i verb comps mode

    local -A OPTS=(
        [STANDALONE]='-h --help --version -q --quiet --no-ask-password --system --user'
        [ARG]='--background --title'
    )

    _init_completion || return

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

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

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

    local -A VERBS=(
        [STANDALONE]='list'
        [PTYS]='monitor hangup'
    )

    for ((i=0; i < COMP_CWORD; i++)); do
        if __contains_word "${COMP_WORDS[i]}" ${VERBS[*]}; then
            verb=${COMP_WORDS[i]}
            break
        fi
    done

    if [[ -z ${verb-} ]]; then
        comps=${VERBS[*]}
    elif __contains_word "$verb" ${VERBS[STANDALONE]}; then
        comps=''
    elif __contains_word "$verb" ${VERBS[PTYS]}; then
        comps=$(__get_ptys $mode)
    fi

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

complete -F _ptyctl ptyctl