# SPDX-License-Identifier: GPL-3.0-only

babel_add_interface() {
	[ "$#" -ne "4" ] && return 1

	local name="$1"
	local interface="$2"
	local type="$3"
	local rxcost="$4"

	mkdir -p /tmp/bird-babel
	echo "interface \"$interface\" { type $type; rxcost $rxcost; };" > /tmp/bird-babel/$name.conf

	return 0
}

babel_delete_interface() {
	[ "$#" -ne "1" ] && return 1

	local name="$1"

	# Removing peers from /etc is not necessary, as all peers are generated into /tmp on every configuration run,
	# which completely overwrites existing peers in /etc in the apply step.
	rm -f /tmp/bird-babel/$name.conf

	return 0
}

babel_add_redistribute_filter() {
	return 0
}

babel_remove_custom_redistribute_filters() {
	return 0
}

babel_apply() {
	# error output hidden because apply might be executed without a preceding configure step.
	if [ -d /tmp/bird-babel ]; then
		rm -rf /etc/bird-babel
		mv /tmp/bird-babel /etc/bird-babel
	fi

	return 0
}

babel_reload_implementation() {
	# Change include file path, so bird uses the correct configuration, depending on the configuration state:
	#  - If test mode is active (and /tmp/bird-babel exists), switch to the temporary (/tmp) configuration to be tested.
	#  - If new settings are applied or the old settings are restored after an unsuccessful test (and /tmp/bird-babel does not exist),
	#    switch back to the permanent configuration (/etc).
	if [ -d /tmp/bird-babel ]; then
		echo 'include "/tmp/bird-babel/*.conf";' > /etc/bird-babel-include.conf
	else
		echo 'include "/etc/bird-babel/*.conf";' > /etc/bird-babel-include.conf
	fi

	/etc/init.d/bird reload
}

babel_revert() {
	rm -r /tmp/bird-babel
}