#
# Copyright (C) 2018-2023 Ycarus (Yannick Chabanois) <ycarus@zugaina.org> for OpenMPTCProuter
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
# This script save latencies and set additionnal latencies if set on interface

[ "$OMR_TRACKER_STATUS" = "ERROR" ] || [ -z "$OMR_TRACKER_INTERFACE" ] && exit 0
interface_up=$(ifstatus "$OMR_TRACKER_INTERFACE" 2>/dev/null | jsonfilter -q -e '@["up"]')
[ "$interface_up" != "true" ] && exit 0

[ -n "$OMR_TRACKER_INTERFACE" ] && [ -n "$OMR_TRACKER_LATENCY" ] && {
	[ "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.latency)" != "" ] && uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.latency_previous="$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.latency)"
	uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.latency="$OMR_TRACKER_LATENCY"
	#[ -z "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.latency_max)" ] && uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.latency_max="$OMR_TRACKER_LATENCY"
	#[ "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.latency_max)" -lt "$OMR_TRACKER_LATENCY" ] && uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.latency_max="$OMR_TRACKER_LATENCY"
	if [ "$multipath_config" = "on" ] && [ "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.multipath)" != "master" ] && ([ "$(uci -q get openmptcprouter.settings.master)" = "dynamic" ] || ( ( [ "$(uci -q get openmptcprouter.settings.master)" = "change" ] || [ "$(uci -q get openmptcprouter.settings.master)" = "" ] ) && [ "$(uci -q get openmptcprouter.settings.master_lcintf | grep $OMR_TRACKER_INTERFACE)" = "" ] ) ); then
		masterintf="$(uci -q show openmptcprouter | grep -m 1 multipath=\'master\' | cut -d'.' -f2)"
		[ -z "$masterintf" ] && masterintf="$(uci -q show network | grep -m 1 multipath=\'master\' | cut -d'.' -f2)"
		masterlatency="$(uci -q get openmptcprouter.$masterintf.latency | tr -d '\n')"
		if [ -z "$masterlatency" ] || ([ -n "$masterintf" ] && [ "$(uci -q get openmptcprouter.$masterintf.state)" = "down" ]); then
			masterlatency=1000
		fi
		if [ -n "$masterintf" ] && ([ "$masterlatency" != "" ] || [ "$(uci -q get openmptcprouter.$masterintf.state)" = "down" ]); then
			if ( ( [ "$(uci -q get openmptcprouter.settings.master)" = "change" ] || [ "$(uci -q get openmptcprouter.settings.master)" = "" ] ) && [ "$OMR_TRACKER_LATENCY" -lt $(awk "BEGIN {printf \"%i\",${masterlatency}/1.5}") ] ) || ( [ "$(uci -q get openmptcprouter.settings.master)" = "dynamic" ] && [ "$OMR_TRACKER_LATENCY" -lt "$((masterlatency/2))" ] && [ "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.latency_previous)" -lt "$((masterlatency/2))" ] ); then
				uci -q set network.$masterintf.multipath='on'
				uci -q set openmptcprouter.$masterintf.multipath='on'
				uci -q set network.$OMR_TRACKER_INTERFACE.multipath='master'
				uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.multipath='master'
				if [ "$(uci -q get openmptcprouter.settings.master_lcintf | grep $OMR_TRACKER_INTERFACE)" = "" ]; then
					uci -q add_list openmptcprouter.settings.master_lcintf="$OMR_TRACKER_INTERFACE"
				fi
				if [ "$(uci -q get openmptcprouter.settings.master)" = "" ]; then
					uci -q set openmptcprouter.settings.master="change"
				fi
				if [ "$(uci -q get openmptcprouter.settings.master)" != "dynamic" ]; then
					[ -n "$(uci -q changes network)" ] && uci -q commit network
					[ -n "$(uci -q changes openmptcprouter)" ] && uci -q commit openmptcprouter
				fi
				_log "Change master interface from $masterintf ($masterlatency ms) to $OMR_TRACKER_INTERFACE ($OMR_TRACKER_LATENCY ms)"
			fi
		fi
	fi
	[ -n "$(uci -q changes openmptcprouter)" ] && uci -q commit openmptcprouter
}

if [ -n "$OMR_TRACKER_INTERFACE" ] && [ -n "$OMR_TRACKER_DEVICE" ]; then
	addlatency=$(uci -q get network.${OMR_TRACKER_INTERFACE}.addlatency)
	[ -z "$addlatency" ] && addlatency="0"
	if [ "$addlatency" = "0" ] && [ "$(tc qdisc show dev $OMR_TRACKER_DEVICE | grep delay)" != "" ]; then
		tc qdisc del dev ${OMR_TRACKER_DEVICE} root netem 2>&1 >/dev/null
	fi
	if [ "$addlatency" != "0" ]; then
		if [ "$(tc qdisc show dev $OMR_TRACKER_DEVICE | grep delay)" = "" ]; then
			tc qdisc add dev ${OMR_TRACKER_DEVICE} root netem delay ${addlatency}ms 2>&1 >/dev/null
		elif [ "$(tc qdisc show dev $OMR_TRACKER_DEVICE | awk '/delay/ { print $10 }' | sed 's/ms//')" != "$addlatency" ]; then
			tc qdisc replace dev ${OMR_TRACKER_DEVICE} root netem delay ${addlatency}ms 2>&1 >/dev/null
		fi
	fi
fi