#!/usr/bin/env bash

# CONSTANTS

BASEDIR=$(dirname "$0")
OLDNAME=''
NEWNAME=''

# FUNCTIONS

function usage {
	echo "usage: $(basename "$0") {current_name} {new_name}"
}

function parse_options {
	while [[ $# -gt 0 ]]; do
		case "$1" in
		--help | -h)
			usage && exit 0
			;;
		*)
			if [[ -z $OLDNAME ]]; then
				OLDNAME=$1
			else
				if [[ -z $NEWNAME ]]; then
					NEWNAME=$1
				else
					echo >&2 "Unknown option: $1" && usage && exit 2
				fi
			fi
			;;
		esac

		shift 1 # Move to the next argument
	done
}

function assert_args {
	[[ -z $NEWNAME ]] && echo 'error: arguments required!' && usage && exit 10

	if vmid=$(pct-lookup $NEWNAME 2>/dev/null); then
		echo "error: new_name already used for vmid=<$vmid>!"
		exit 20
	fi
}

function rename {
	vmid=$(pct-lookup $OLDNAME)
	pct set $vmid --hostname "$NEWNAME"
}

# MAIN

set -Eue
parse_options $*
assert_args
rename
sleep 2