#!/bin/sh

. /lib/functions.sh
. /lib/functions/network.sh
. /lib/mwan3/mwan3.sh
. /usr/share/libubox/jshn.sh

[ "$ACTION" == "ifup" -o "$ACTION" == "ifdown" ] || exit 1
[ -n "$INTERFACE" ] || exit 2

if [ "$ACTION" == "ifup" ]; then
        [ -n "$DEVICE" ] || exit 3
fi

config_load mwan3
config_get_bool enabled globals 'enabled' '0'
[ ${enabled} -gt 0 ] || exit 0

mwan3_lock "$ACTION" "$INTERFACE"
mwan3_init
mwan3_set_connected_iptables
mwan3_set_custom_ipset
mwan3_unlock "$ACTION" "$INTERFACE"

config_get enabled $INTERFACE enabled 0
config_get initial_state $INTERFACE initial_state "online"
[ "$enabled" == "1" ] || exit 0

if [ "$ACTION" == "ifup" ]; then
	config_get family $INTERFACE family ipv4
	if [ "$family" = "ipv4" ]; then
		ubus call network.interface.${INTERFACE}_4 status &>/dev/null
		if [ "$?" -eq "0" ]; then
			network_get_ipaddr src_ip ${INTERFACE}_4
		else
			network_get_ipaddr src_ip ${INTERFACE}
		fi
		[ -n "$src_ip" ] || src_ip="0.0.0.0"
	elif [ "$family" = "ipv6" ]; then
		ubus call network.interface.${INTERFACE}_6 status &>/dev/null
		if [ "$?" -eq "0" ]; then
			network_get_ipaddr6 src_ip ${INTERFACE}_6
		else
			network_get_ipaddr6 src_ip ${INTERFACE}
		fi
		[ -n "$src_ip" ] || src_ip="::"
	fi
fi

if [ "$initial_state" = "offline" ]; then
	json_load "$(ubus call mwan3 status '{"section":"interfaces"}')"
	json_select "interfaces"
	json_select "${INTERFACE}"
	json_get_var running running
	json_get_var status status
else
	status=online
	running=1
fi

mwan3_lock "$ACTION" "$INTERFACE"
$LOG notice "Execute "$ACTION" event on interface $INTERFACE (${DEVICE:-unknown})"

case "$ACTION" in
	ifup)
		mwan3_set_general_rules
		mwan3_set_general_iptables
		mwan3_create_iface_iptables $INTERFACE $DEVICE
		mwan3_create_iface_rules $INTERFACE $DEVICE
		mwan3_create_iface_route $INTERFACE $DEVICE
		if [ ${running} -eq 1 -a "${status}" = "online" ]; then
			$LOG notice "Starting tracker on interface $INTERFACE (${DEVICE:-unknown})"
			mwan3_set_iface_hotplug_state $INTERFACE "online"
			mwan3_track $INTERFACE $DEVICE "online" "$src_ip"
		else
			$LOG notice "Starting tracker on interface $INTERFACE (${DEVICE:-unknown})"
			mwan3_set_iface_hotplug_state $INTERFACE "offline"
			mwan3_track $INTERFACE $DEVICE "offline" "$src_ip"
		fi
		mwan3_set_policies_iptables
		mwan3_set_user_rules
		mwan3_flush_conntrack $INTERFACE $DEVICE "ifup"
	;;
	ifdown)
		mwan3_set_iface_hotplug_state $INTERFACE "offline"
		mwan3_delete_iface_ipset_entries $INTERFACE
		mwan3_track_signal $INTERFACE $DEVICE
		mwan3_set_policies_iptables
		mwan3_set_user_rules
		mwan3_flush_conntrack $INTERFACE $DEVICE "ifdown"
	;;
esac

mwan3_unlock "$ACTION" "$INTERFACE"

exit 0