#!/bin/sh

# Usage: vpn-select <path-to-hood-file>

. /usr/share/libubox/jshn.sh

hoodfile="$1"

make_config() {
	# remove old config
	rm /tmp/fastd_fff_peers/*

	# prepare
	Index=1
	json_load "$(cat "$hoodfile")"
	json_select vpn

	# get fastd peers
	while json_select "$Index" > /dev/null
	do
		json_get_var protocol protocol
		if [ "$protocol" = "fastd" ]; then
			# set up fastd
			json_get_var servername name
			filename="/etc/fastd/fff/peers/$servername"
			echo "#name \"${servername}\";" > "$filename"
			json_get_var key key
			echo "key \"${key}\";" >> "$filename"
			json_get_var address address
			json_get_var port port
			echo "remote \"${address}\" port ${port};" >> "$filename"
			echo "" >> "$filename"
			echo "float yes;" >> "$filename"
		fi
		json_select ".." # back to vpn
		Index=$(( Index + 1 ))
	done
	json_select ".." # back to root
}

# Only do something if file is there and not empty; otherwise exit 1
if [ -s "$hoodfile" ]; then
	if [ ! -d /tmp/fastd_fff_peers ]; then
		# first run after reboot
		mkdir /tmp/fastd_fff_peers
		make_config
		# start fastd only if there are some peers
		[ "$(ls /etc/fastd/fff/peers/* 2>/dev/null)" ] && /etc/init.d/fastd start
	else
		make_config
		/etc/init.d/fastd reload

		# fastd start/stop for various situations
		pidfile="/tmp/run/fastd.fff.pid"
		if [ "$(ls /etc/fastd/fff/peers/* 2>/dev/null)" ]; then
			([ -s "$pidfile" ] && [ -d "/proc/$(cat "$pidfile")" ]) || /etc/init.d/fastd start
		else
			([ -s "$pidfile" ] && [ -d "/proc/$(cat "$pidfile")" ]) && /etc/init.d/fastd stop
		fi
	fi
	exit 0
else
	echo "vpn-select: Hood file not found or empty!"
	exit 1
fi