#!/bin/sh

[ -n "$1" ] || exit

. /lib/functions.sh

# retrieve args
OMR_QUOTA_INTERFACE="$1"
shift

# main loop
while true; do
	OMR_QUOTA_REAL_INTERFACE="$(ifstatus $OMR_QUOTA_INTERFACE | jsonfilter -e '@.l3_device')"
	rx=`vnstat -i $OMR_QUOTA_REAL_INTERFACE --json | jsonfilter -q -e '@.interfaces[0].traffic.months[-1].rx' | tr -d "\n"`
	tx=`vnstat -i $OMR_QUOTA_REAL_INTERFACE --json | jsonfilter -q -e '@.interfaces[0].traffic.months[-1].tx' | tr -d "\n"`
	tt=$((rx + tx))
	if [ -n "$OMR_QUOTA_RX" ] && [ "$OMR_QUOTA_RX" -gt 0 ] && [ -n "$rx" ] && [ "$OMR_QUOTA_RX" -le "$rx" ]; then
		if [ "$(ifstatus $OMR_QUOTA_INTERFACE | jsonfilter -e '@.up')" = "true" ]; then
			logger -t "OMR-QUOTA" "Set interface $OMR_QUOTA_INTERFACE down, RX quota reached"
			ifdown $OMR_QUOTA_INTERFACE
		fi
	elif [ -n "$OMR_QUOTA_TX" ] && [ "$OMR_QUOTA_TX" -gt 0 ] && [ -n "$tx" ] && [ "$OMR_QUOTA_TX" -le "$tx" ]; then
		if [ "$(ifstatus $OMR_QUOTA_INTERFACE | jsonfilter -e '@.up')" = "true" ]; then
			logger -t "OMR-QUOTA" "Set interface $OMR_QUOTA_INTERFACE down, TX quota reached"
			ifdown $OMR_QUOTA_INTERFACE
		fi
	elif [ -n "$OMR_QUOTA_TT" ] && [ "$OMR_QUOTA_TT" -gt 0 ] && [ -n "$tt" ] && [ "$OMR_QUOTA_TT" -le "$tt" ]; then
		if [ "$(ifstatus $OMR_QUOTA_INTERFACE | jsonfilter -e '@.up')" = "true" ]; then
			logger -t "OMR-QUOTA" "Set interface $OMR_QUOTA_INTERFACE down, RX+TX quota reached"
			ifdown $OMR_QUOTA_INTERFACE
		fi
	elif [ -n "$OMR_QUOTA_RX" ] && [ "$OMR_QUOTA_RX" -gt 0 ] && [ -n "$OMR_QUOTA_TX" ] && [ "$OMR_QUOTA_TX" -gt 0 ] && [ -n "$OMR_QUOTA_TT" ] && [ "$OMR_QUOTA_TT" -gt 0 ] && [ "$(ifstatus $OMR_QUOTA_INTERFACE | jsonfilter -e '@.up')" = "false" ]; then
		logger -t "OMR-QUOTA" "Set interface $OMR_QUOTA_INTERFACE up"
		ifup $OMR_QUOTA_INTERFACE
	fi
	sleep "$OMR_QUOTA_INTERVAL"
done