#!/bin/sh

PREFIX=
: ${LIBDIR=$PREFIX/lib}
. "$LIBDIR/libalpine.sh"

usage() {
	cat >&$(( $1 + 1 ))<<-__EOF__
		usage: setup-ntp [-h] [busybox|openntpd|chrony|none]

		Setup NTP time synchronization

		options:
		 -h  Show this help

		 User is prompted if no NTP daemon is specified
	__EOF__
	exit $1
}

while getopts "hc:" opt; do
	case $opt in
		c) resp="$OPTARG";;
		h) usage 0;;
		'?') usage 1;;
	esac
done
shift $(( $OPTIND - 1 ))

: ${resp:=$1}

while [ $# -eq 0 ] && ! isin "$resp" busybox openntpd chrony none abort; do
	if date -d "$resp" >/dev/null 2>&1; then
		$MOCK date -s "$resp"
	else
		# display current time before asking for NTP client
		date
	fi
	ask "Which NTP client to run? ('busybox', 'openntpd', 'chrony' or 'none')" chrony
done

pkgs="$resp"

case "$resp" in
	none|abort)
		exit 0
		;;
	busybox)
		pkgs=''
		svc=ntpd
		;;
	chrony)
		if apk info --installed --quiet acf-core; then
			pkgs="$pkgs acf-chrony"
		fi
		svc=chronyd
		;;
	openntpd)
		svc=openntpd
		;;
	*)
		echo "setup-ntp: '$resp' is not a supported NTP client" >&2
		usage 1
		;;
esac

[ -z "$pkgs" ] || apk add --quiet $pkgs
rc-update add $svc default
rc-service $svc start