#!/bin/bash
#-----------------------------------------------------------------------------------------------------------------------------------
#
# Rx3 IP Host Update
#
# Copyright (C) 2025-2026 Arnaud G. GIBERT
# mailto:arnaud@rx3.net
#
# This 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 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; If not, see
# <https://www.gnu.org/licenses/>.
#
#-----------------------------------------------------------------------------------------------------------------------------------



#-----------------------------------------------------------------------------------------------------------------------------------
# Includes
#-----------------------------------------------------------------------------------------------------------------------------------

: "${RX3_LIB_DIR:=/usr/lib/rx3}"
. "${RX3_LIB_DIR}/dns.bash"





#-----------------------------------------------------------------------------------------------------------------------------------
# Global Variables
#-----------------------------------------------------------------------------------------------------------------------------------

declare -g VERSION="1.0.0"
declare -g    NAME="ip_host_update"
declare -g    HELP="usage: [-h | --help] | [-V | --version] | [-v | --verbose] <host> <zone> <ip> <ttl>"

declare -g    MODE="DEFAULT"
declare -g VERBOSE="FALSE"
declare -g DRY_RUN="FALSE"
declare -g  RETVAL=0

declare -g   DEBUG=""
#declare -g   DEBUG="echo"
#declare -g   DEBUG=":"

declare -g     LOG=""
#declare -g     LOG=":"
#declare -g     LOG="echo"

declare -g    HOST=""
declare -g    ZONE=""
declare -g      IP=""
declare -g     TTL=""





#-----------------------------------------------------------------------------------------------------------------------------------
# Version Print
#-----------------------------------------------------------------------------------------------------------------------------------

ihu_version_print()
{
    version_print
}





#-----------------------------------------------------------------------------------------------------------------------------------
# Help Print
#-----------------------------------------------------------------------------------------------------------------------------------

ihu_help_print()
{
    ihu_version_print
    help_print
}





#-----------------------------------------------------------------------------------------------------------------------------------
# Arg Parse
#-----------------------------------------------------------------------------------------------------------------------------------

ihu_args_parse()
{
    tmp_args=$(getopt -o hvV --long help,verbose,version -n "${NAME}" -- "$@")

    if [ $? != 0 ]; then echo "Terminating..." >&2; exit 1; fi

    eval set -- "${tmp_args}"

    while true
    do
        case "$1" in
            # Options
            -h|--help)        MODE="EXIT"; ihu_help_print;    shift;;
            -V|--version)     MODE="EXIT"; ihu_version_print; shift;;
            -v|--verbose)  VERBOSE="TRUE";                    shift;;

            # End of options
            --)                                               shift;  break;;
            *) echo "args_parse internal error [$1]!";                exit 1;;
        esac
    done

    if [[ "${MODE}" != "EXIT" ]]
    then
        if [[ "${#}" -lt "4" ]]
        then
            MODE="EXIT"

            echo_error "Not enough args!"
            ihu_help_print
        else
            MODE="UPDATE"
            HOST="$1"
            ZONE="$2"
              IP="$3"
             TTL="$4"
        fi
    fi
}





#-----------------------------------------------------------------------------------------------------------------------------------
# Host Update
#-----------------------------------------------------------------------------------------------------------------------------------

ihu_host_update()
{
    local host="$1"
    local zone="$2"
    local   ip="$3"
    local  ttl="$4"

    dns_host_update "${host}" "${zone}" "${ip}" "${ttl}"
}





#-----------------------------------------------------------------------------------------------------------------------------------
# Main
#-----------------------------------------------------------------------------------------------------------------------------------

ihu_args_parse "$@"

if [[ "${MODE}" == "EXIT" ]]
then
    exit 0
fi

case "${MODE}" in
    UPDATE)
        ihu_host_update "${HOST}" "${ZONE}" "${IP}" "${TTL}"
    ;;

    *)
        echo "Usage: $0 <host> <zone> <ip> <ttl>"
        RETVAL=1
    ;;
esac

exit ${RETVAL}