#!/bin/sh

# first check is fff.autol3.ipv6 enabled
if [ -z $(uci -q get fff.autol3.ipv6) ] ; then
	exit;
fi

. /usr/share/libubox/jshn.sh

MACADDR=$(cat /sys/class/net/br-client/address | /bin/sed 's/://g')
MQTTSERVER=$(uci -q get fff.mqtt.server)
ASSIGNEROWN=$(uci -q get fff.autol3.ipv6assigner)
IPOWN=$(uci -q get fff.autol3.ipv6address)

asknew() {
	# Load Blocklist
	ipv6assignerblock=$(uci get fff.autol3.ipv6assignerblock)
	for ipv6assignerblock in $ipv6assignerblock; do
	        block="$block -T  /ipv6/usethis/+/$ipv6assignerblock"  
	done 
	echo $block
        mosquitto_pub -h $MQTTSERVER -p 1883 -t '/ipv6/asknew' -m "$MACADDR" 
        # use the first income message
        # cancel after 5 second, after this time we don't get any IP address
        autol3config=$(mosquitto_sub -h $MQTTSERVER -p 1883 -t '/ipv6/usethis/#' -C 1 $block)
        if [ -z "$autol3config" ] ; then
                echo "No IP get"
                exit 1;
        fi
        json_load "$autol3config"
        json_get_var assigner assigner
        json_get_var ip ip
        uci set fff.autol3.ipv6address=$ip
        uci set fff.autol3.ipv6assigner=$assigner
	uci set fff.autol3.autoconfigl3=1
        uci commit fff
        uci del gateway.@client[0].ip6addr
        uci add_list gateway.@client[0].ip6addr=$ip
        uci commit gateway
	# call canusethis that assigner know we use the ipv6
	canusethis
}

canusethis() {
        mosquitto_pub -h $MQTTSERVER -p 1883 -t /ipv6/canusethis/$ASSIGNEROWN -m "{ \"mac\":\"$MACADDR\", \"ip\":\"$IPOWN\" }"
        canusethisanswer=$(mosquitto_sub -h $MQTTSERVER -p 1883 -t /ipv6/canusethisanswer/$MACADDR -C 1 -W 5)
        # check if we get answer, if no load asknew again and get new ip address
        if [ -z $canusethisanswer ] ; then
		uci del fff.autol3.ipv6address
		uci del fff.autol3.ipv6assigner
                uci commit fff
		uci del gateway.@client[0].ip6addr
		uci commit gateway
                asknew
        fi
}

if [ -n $(uci -q get fff.autol3.ipv6address) ] ; then
        canusethis
fi

if [ -n $(uci -q get fff.autol3) ] && [ -z $(uci -q get fff.autol3.ipv6address) ] ; then
        asknew
fi