#!/usr/bin/env bash 

set -eu

synopsis() {
	cat << EOF
Usage : `basename $0` [-h] 
EOF
}

help() {
	cat << EOF

`basename $0` affiche le premier identificateur libre pour un nouveau système.

`synopsis`

-h	: affiche cette aide

EOF
}

usage() {
	synopsis
	exit 1
}

args() {
	local opt
	while getopts "h" opt; do
		case $opt in
			h) help; exit 0;;
			?) usage;;
		esac
	done
	shift $(($OPTIND - 1))
	[ $# -ne 0 ] && usage || :
}

findIdent() {
	local i=0
	local configs="`find $NETWORK_DIR -follow -type f -name \"*.conf\"`"
	if [ -n "$configs" ]; then
		for i in `seq 0 256`; do
			if ! grep -Eq "^IDENT=$i([[:space:]]|$)" $configs; then
				break
			fi
		done
		if [ $i = 256 ]; then
			error "Aucun identificateur disponible"
		fi
	fi

	echo $i
}

# Programme principal

VDN_PATH=$(readlink -f $(dirname $0)/..); . $VDN_PATH/bin/functions.sh

args "$@"

ident=`findIdent`

echo $ident