#!/bin/bash
# fail fast
set -e

# Symbolic file
LINK_CONF="config.json"

if [ ! -h "$LINK_CONF" ]
then
	echo "'$LINK_CONF' is not a symbolic file or not exist"
	exit 1
fi

# Find target config file
CURR_CONF=$(readlink $LINK_CONF)
echo "Current config file: $CURR_CONF"

# This filename
FILE=$(basename $0)
# Other config file
CONFS=$(ls -1 -I $CURR_CONF -I $LINK_CONF -I $FILE)
NUM_OF_CONF=${#CONFS[*]}

echo
echo "Available options:"
PS3="Select new config: "
select conf in $CONFS
do
	if [ "$REPLY" -lt 1 -o "$REPLY" -gt "$NUM_OF_CONF" ]
	then
		echo
		echo "Invalid option $REPLY"
	else
		echo
		echo "Selected $conf, now link new config to selection"
		sudo ln -f -s $conf $LINK_CONF
		echo "Restart service..."
		sudo systemctl restart v2ray
		break
	fi
done

exit