#!/bin/sh

. /usr/share/libubox/jshn.sh
. /lib/functions/fff/wireless

rm -f /tmp/keyxchangev2data

# Gatewaycheck function
isGatewayAvailable() {
	if [ "$(batctl gwl | wc -l)" -gt 2 ]; then
		return 0
	else
		return 1
	fi
}

# Ping test
hasInternet() {
	test_ipv4_host1="keyserver.freifunk-franken.de" # Freifunk-Franken keyserver
	test_ipv4_host2="8.8.8.8"        # Google DNS
	test_ipv6_host1="heise.de"       # heise Zeitschriftenverlag
	if ping -w5 -c3 "$test_ipv4_host1" &>/dev/null ||
		ping -w5 -c3 "$test_ipv4_host2" &>/dev/null ||
		ping6 -w5 -c3 "$test_ipv6_host1" &>/dev/null ; then
		return 0
	fi
	return 1
}

chan2ghz="1"
chan5ghz="36"

# Hidden AP check

if [ -f /tmp/hiddenapflag ]; then
	if isGatewayAvailable ; then

		uci set network.configap=interface
		uci set network.configap.proto='static'
		uci set network.configap.ip6addr='fe80::1/64'
		uci commit network

		for radio in $(uci show wireless | sed -n 's,.*\.\([a-z0-9]*\)=wifi-device,\1,p'); do
			if ! wifiAddAP "$radio" "config.franken.freifunk.net" "configap" "configap" "1"; then
				echo "Can't add Config interface on $radio."
				exit 1
			fi
		done

		wifi
	fi
	rm /tmp/hiddenapflag
fi

lat=$(uci -q get system.@system[0].latitude)
long=$(uci -q get system.@system[0].longitude)

# if we have Internet, we download the Hoodfile from the keyxchangev2
if hasInternet ; then
	wget -T15 -t5 "http://keyserver.freifunk-franken.de/v2/?lat=$lat&long=$long" -O /tmp/keyxchangev2data
	#if no Internet, we connect to the hidden AP and download the file from another Node in range
else
	# connect to wireless hidden ap here and download the json File from the nearest router
	# Only do that, when we have no gateway in range. If the Uplinkrouter changed the hood, we lost the GW and do this automatically again, I think! Nice idea?
	if ! isGatewayAvailable ; then
		#now we haven't a gateway in Range, we search for a hidden AP to get a keyxchangev2data file!
		#first we delete all wifi settings
		rm -f /www/public/keyxchangev2data # delete this, so interfaces are recreated if reconnect with unchanged hood file takes place

		if ! wifiDelAll; then
			echo "Can't delete current wifi setup"
			exit 1
		fi
		#now we look for phy and add this
		for phy in $(iw phy | awk '/^Wiphy/{ print $2 }'); do
			radio="$(wifiAddPhyCond "$phy" "2" "$chan2ghz")"
			radio5="$(wifiAddPhyCond "$phy" "5" "$chan5ghz")"
			[ -n "$radio5" ] && radio="$radio5"

			#and here we add the station
			if ! wifiAddSta "$radio" "config.franken.freifunk.net" "configSta"; then
				echo "Can't add Sta interface on $radio."
				exit 1
			else
				uci -q set network.configSta=interface
				uci -q set network.configSta.proto='static'
				uci -q commit network
			fi
		done
		
		wifi
		# wait a moment to start the interface
		sleep 10;
		# and here we can download the Hoodfile from the other node
		wget -T15 -t5 "http://[fe80::1%w2sta]/keyxchangev2data" -O /tmp/keyxchangev2data
	else
		echo "We have a Gateway in Range, we load the keyxchangev2data from fe80::1"
		wget -T15 -t5 "http://[fe80::1%br-mesh]:2342/keyxchangev2data" -O /tmp/keyxchangev2data
	fi
fi

if [ -s /tmp/keyxchangev2data ]; then

	# we get a json file in this format: 
	# https://pw.freifunk-franken.de/patch/205/
	# but without signature, every hood file we get is valid!

	catnew="$(cat /tmp/keyxchangev2data | sed 's/"timestamp":[0-9]*/"timestamp":0/')"
	catold="$(cat /www/public/keyxchangev2data 2>/dev/null | sed 's/"timestamp":[0-9]*/"timestamp":0/')"
	sumnew=$(echo "$catnew" | sha256sum | cut -f1 -d " ")
	sumold=$(echo "$catold" | sha256sum | cut -f1 -d " ")

	json_load "$(cat /tmp/keyxchangev2data)"

	if [ "$sumnew" != "$sumold" ]; then
		echo "New file detect, we reconfigure the Node";

		json_select hood

		json_get_var hood name
		json_get_var mesh_bssid mesh_bssid
		json_get_var mesh_essid mesh_essid
		json_get_var essid essid
		# i think the next things we don't active this in the first version! we can do it later
		#json_get_var channel2 channel2
		#json_get_var mode2 mode2
		#json_get_var type2 type2
		#json_get_var channel5 channel5
		#json_get_var mode5 mode5
		#json_get_var type5 type5
		#json_get_var protocol protocol
		
		json_select ".." # back to root

		echo "Setting hood name: $hood"
		uci set "system.@system[0].hood=$hood"

		if ! wifiDelAll; then
			echo "Can't delete current wifi setup"
			exit 1
		fi

		for phy in $(iw phy | awk '/^Wiphy/{ print $2 }'); do
			radio="$(wifiAddPhyCond "$phy" "2" "$chan2ghz")"
			radio5="$(wifiAddPhyCond "$phy" "5" "$chan5ghz")"
			[ -n "$radio5" ] && radio="$radio5"

			if ! wifiAddAP "$radio" "$essid" "mesh" "ap" "0"; then
				echo "Can't add AP interface on $radio."
				exit 1
			fi

			# here we set a bit for add hidden AP
			touch /tmp/hiddenapflag

			if ! wifiAddAdHocMesh "$radio" "$mesh_essid" "$mesh_bssid"; then
				echo "Can't add AP interface on $radio."
				exit 1
			fi
		done

		echo "Loading wifi"
		wifi

		# copy the file to webroot so that other Meshrouter can download it;
		# copy only after all other steps so IF can be reentered if something goes wrong
		cp /tmp/keyxchangev2data /www/public/

	else
		echo "We have no new file. We do nothing. We try it again in 5 minutes...";
	fi
	
	# and now we get to vpn-select script and load VPNs directly from /tmp/keyxchangev2data
	
	if hasInternet ; then
		sh /usr/sbin/vpn-select
	fi
else
	echo "We haven't got a file. We do nothing. We try it again in 5 minutes...";
	exit 0
fi