#!/usr/bin/env bash
#
# Copyright (c) 2024 YunoHost Contributors
#
# This file is part of YunoHost (see https://yunohost.org)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#

# Exit hook on subcommand error or unset variable
set -eu

_generate_config() {
    echo "domains:"
    # Add yunohost.local (only if yunohost.local ain't already in ynh_domains)
    if ! echo "${YNH_DOMAINS:-}" | tr ' ' '\n' | grep -q --line-regexp 'yunohost.local'; then
        echo "    - yunohost.local"
    fi
    for domain in ${YNH_DOMAINS:-}; do
        # Only keep .local domains (don't keep
        [[ "$domain" =~ [^.]+\.[^.]+\.local$ ]] && echo "Subdomain $domain cannot be handled by Bonjour/Zeroconf/mDNS" >&2
        [[ "$domain" =~ ^[^.]+\.local$ ]] || continue
        echo "    - $domain"
    done
    if [[ -e /etc/yunohost/mdns.aliases ]]; then
        for localalias in $(cat /etc/yunohost/mdns.aliases | grep -v "^ *$"); do
            echo "    - $localalias.local"
        done
    fi
}

do_init_regen() {
    do_pre_regen ""
    do_post_regen /etc/systemd/system/yunomdns.service
    systemctl enable yunomdns --quiet
}

do_pre_regen() {
    pending_dir="$1"

    cd /usr/share/yunohost/conf/mdns
    mkdir -p "$pending_dir/etc/systemd/system/"
    cp yunomdns.service "$pending_dir/etc/systemd/system/"

    if ! getent passwd mdns &> /dev/null; then
        useradd --no-create-home --shell /usr/sbin/nologin --system --user-group mdns
    fi

    mkdir -p "$pending_dir/etc/yunohost"
    _generate_config > "$pending_dir/etc/yunohost/mdns.yml"
}

do_post_regen() {
    regen_conf_files="$1"

    chown mdns:mdns /etc/yunohost/mdns.yml

    # If we changed the systemd ynh-override conf
    if echo "$regen_conf_files" | sed 's/,/\n/g' | grep -q "^/etc/systemd/system/yunomdns.service$"; then
        systemctl daemon-reload
    fi

    # Legacy stuff to enable the new yunomdns service on legacy systems
    if [[ -e /etc/avahi/avahi-daemon.conf ]] && grep -q 'yunohost' /etc/avahi/avahi-daemon.conf; then
        systemctl enable yunomdns --now --quiet
        sleep 2
    fi

    if [[ -n "$regen_conf_files" ]]; then
        systemctl restart yunomdns
    fi
}

"do_$1_regen" "$(echo "${*:2}" | xargs)"