#!/bin/bash

# Get the first parameter as LOCAL_PORT (default to 25565 for Minecraft)
LOCAL_PORT=${1:-25565}

# Get the second parameter as OFFSET (default to 0 so public port == local port)
OFFSET=${2:-0}

# Calculate the PUBLICPORT by adding the OFFSET to the LOCAL_PORT
PUBLICPORT=$(($LOCAL_PORT + OFFSET))

# SSH host alias (defined in ~/.ssh/config)
SSH_HOST="spotbot"

echo " $SSH_HOST:$PUBLICPORT -->  localhost : $LOCAL_PORT "

# Run SSH command to create a reverse tunnel from the server
while true; do
  autossh -M 0 -N \
    -R 0.0.0.0:$PUBLICPORT:localhost:$LOCAL_PORT \
    -o "ServerAliveInterval 20" -o "ServerAliveCountMax 3" \
    $SSH_HOST
  sleep 5
done