#=======================================
# COMMANDLINE PARSER
#=======================================

help() {
	cat <<EOF
Usage: nightscout-tool [options]

Description:
	Nightscout-tool is a command-line tool for managing Nightscout.	

	In UI mode, tool provides a menu-driven interface for managing Nightscout server, its configuration, updates, cleanup, and diagnostics.
	In watchdog mode, it can be used to monitor the status of Nightscout and send an email alert if the service is down.

Options:
  -w, --watchdog    Run in watchdog mode
  -v, --version     Show version
  -l, --loud        Enable debug logging
  -d, --develop     Switch to DEVELOP update channel
  -p, --production  Switch to PRODUCTION update channel
  -u, --update      Force update check
  -c, --channel     Switch to specified update channel
  -h, --help        Show this help message
EOF
}

parse_commandline_args() {

	load_update_channel

	CMDARGS=$(getopt --quiet -o wvdpuc: --long watchdog,version,develop,production,update,channel: -n 'nightscout-tool' -- "$@")

	# shellcheck disable=SC2181
	if [ $? != 0 ]; then
		echo "Invalid arguments: " "$@" >&2
		exit 1
	fi

	# Note the quotes around '$TEMP': they are essential!
	eval set -- "$CMDARGS"

	WATCHDOGMODE=false
	while true; do
		case "$1" in
		-w | --watchdog)
			WATCHDOGMODE=true
			shift
			;;
		-v | --version)
			echo "$SCRIPT_VERSION"
			exit 0
			;;
		-l | --loud)
			warn "Loud mode, enabling debug logging"
			FORCE_DEBUG_LOG="1"	
			update_logto
			shift
			;;
		-d | --develop)
			warn "Switching to DEVELOP update channel"
			UPDATE_CHANNEL=develop
			forceUpdateCheck=1
			echo "$UPDATE_CHANNEL" >"$UPDATE_CHANNEL_FILE"
			update_logto
			shift
			;;
		-p | --production)
			warn "Switching to PRODUCTION update channel"
			UPDATE_CHANNEL=master
			forceUpdateCheck=1
			echo "$UPDATE_CHANNEL" >"$UPDATE_CHANNEL_FILE"
			update_logto
			shift
			;;
		-u | --update)
			warn "Forcing update check"
			forceUpdateCheck=1
			shift
			;;
		-c | --channel)
			shift # The arg is next in position args
			UPDATE_CHANNEL_CANDIDATE=$1
			forceUpdateCheck=1

			[[ ! "$UPDATE_CHANNEL_CANDIDATE" =~ ^[a-z]{3,}$ ]] && {
				echo "Incorrect channel name provided: $UPDATE_CHANNEL_CANDIDATE"
				exit 1
			}

			warn "Switching to $UPDATE_CHANNEL_CANDIDATE update channel"
			UPDATE_CHANNEL="$UPDATE_CHANNEL_CANDIDATE"
			echo "$UPDATE_CHANNEL" >"$UPDATE_CHANNEL_FILE"
			update_logto
			shift
			;;
		-h | --help)
			help
			exit 0
			;;	
		--)
			shift
			break
			;;
		*) break ;;
		esac
	done

	if [ "$WATCHDOGMODE" = "true" ]; then
		watchdog_check
	fi

}