#!/usr/bin/env bash

# ==============================================================================
# Config

SOURCE=${BASH_SOURCE[0]}
while [ -L "$SOURCE" ]; do
  DIR=$(cd -P "$(dirname "$SOURCE")" >/dev/null 2>&1 && pwd)
  SOURCE=$(readlink "$SOURCE")
  [[ $SOURCE != /* ]] && SOURCE=$DIR/$SOURCE
done
DIR=$(cd -P "$(dirname "$SOURCE")" >/dev/null 2>&1 && pwd)

if [[ -f "$DIR/config/config.sh" ]]; then
  source "$DIR/config/config.sh"
else
  echo "config/config.sh missing!"
  exit 1
fi

# Must be run as root
if [ "$(id -u)" -ne 0 ]; then
  echo 'This script must be run as root.' >&2
  exit 1
fi

# ==============================================================================

PREV_STATUS=""

while true; do
  STATUS=$(cat /sys/class/net/$ETH_IFACE/carrier 2>/dev/null)

  if [ "$STATUS" != "$PREV_STATUS" ]; then
    if [ "$STATUS" == "0" ]; then
      echo -e "\n----> Interface $ETH_IFACE has been unplugged."
      bash "$DIR/bridge/bridge-reset.sh"
      echo -e "--> Reset complete\n"
    elif [ "$STATUS" == "1" ]; then
      echo -e "\n----> Interface $ETH_IFACE has been plugged in."
      # Clone the MAC first so that when we give the client an IP they'll know we're ready to go.
      bash "$DIR/bridge/clone-client-mac.sh"
      echo ""
      bash "$DIR/bridge/bridge-lan.sh"
      echo -e "--> Bridge complete\n"
    else
      echo -e "\n----> Interface $ETH_IFACE not found, doing nothing...\n"
    fi
    PREV_STATUS="$STATUS"
  fi
  sleep 1
done