# shellcheck shell=bash
# systemd-creds(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_tpm2_devices() {
    local a b c
    systemd-creds --no-legend --quiet --tpm2-device=list 2>/dev/null |
        { while read -r a b c; do echo " $a"; done; }
}

__get_creds() {
    local a b c
    local mode=$1; shift 1
    systemd-creds list $mode --no-legend --no-pager $1 2>/dev/null |
        { while read -r a b c; do echo " $a"; done; }
}

_systemd_creds() {
    local verb comps mode i
    local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} words cword
    local -A OPTS=(
        [STANDALONE]='-h --help --version --no-pager --no-legend --no-ask-password
                      -H -T --system --user -p --pretty --allow-null'
        [ARG]='--tpm2-device
               --tpm2-device-key
               --tpm2-pcrs
               --tpm2-public-key
               --tpm2-public-key-pcrs
               --tpm2-signature
               --json
               --transcode
               --newline
               --name
               --timestamp
               --not-after
               --with-key
               --uid'
    )

    local -A VERBS=(
        [STANDALONE]='list setup'
        [CAT]='cat'
        [ENCRYPT]='encrypt'
        [DECRYPT]='decrypt'
    )

    local -A OPTS_FOR_VERB=(
        [CAT]='--help
               --version
               --no-pager
               --no-legend
               --user
               --system'
        [ENCRYPT]='--help
                   --version
                   --no-pager
                   --no-legend
                   --no-ask-password
                   --uid
                   --with-key
                   -H
                   -T
                   --tpm2-device
                   --tpm2-pcrs
                   --tpm2-public-key
                   --tpm2-public-key-pcrs
                   --tpm2-signature
                   --not-after
                   --name
                   --timestamp
                   --pretty'
        [DECRYPT]='--help
                   --version
                   --no-pager
                   --no-legend
                   --no-ask-password
                   --uid
                   --tpm2-device
                   --tpm2-pcrs
                   --tpm2-public-key
                   --tpm2-public-key-pcrs
                   --tpm2-signature
                   --name
                   --timestamp
                   --allow-null'
    )

    _init_completion || return

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

    if __contains_word "$prev" ${OPTS[ARG]}; then
        case $prev in
            --tpm2-public-key|--tpm2-signature)
                comps=$(compgen -A file -- "$cur")
                compopt -o filenames
                ;;
            --tpm2-device)
                comps="auto list $(__get_tpm2_devices)"
                ;;
            --json)
                comps=$( systemd-creds --json=help 2>/dev/null )
                ;;
            --transcode)
                comps=$( systemd-creds --no-legend --transcode=help 2>/dev/null )
                ;;
            --with-key)
                comps=$( systemd-creds --no-legend --with-key=help 2>/dev/null )
                ;;
        esac
        COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
        return 0
    fi

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

    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" ${VERBS[STANDALONE]}; then
        comps=''
    elif __contains_word "$verb" ${VERBS[CAT]}; then
        if [[ $cur = -* ]]; then
            comps=${OPTS_FOR_VERB[CAT]}
        else
            comps=$( __get_creds $mode )
        fi
    elif __contains_word "$verb" ${VERBS[ENCRYPT]}; then
        if [[ $cur = -* ]]; then
            comps=${OPTS_FOR_VERB[ENCRYPT]}
        else
            comps=$( compgen -A file -- "$cur" )
            compopt -o filenames
        fi
    elif __contains_word "$verb" ${VERBS[DECRYPT]}; then
        if [[ $cur = -* ]]; then
            comps=${OPTS_FOR_VERB[DECRYPT]}
        else
            comps=$( compgen -A file -- "$cur" )
            compopt -o filenames
        fi
    fi

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

complete -F _systemd_creds systemd-creds
