#!/bin/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 "$DIR/../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

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

iptables -X
iptables -F
iptables -t nat -X
iptables -t nat -F
echo "Cleared iptables."

# Restore MAC address to WLAN interface
ifconfig $WLAN_IFACE down
ifconfig $WLAN_IFACE hw ether "$(ethtool -P $WLAN_IFACE | awk '{print $3}')"
ifconfig $WLAN_IFACE up
echo "Reset the $WLAN_IFACE WiFi interface."

while true; do
  WLAN_IFACE_IP=$(ip -4 -br addr show $WLAN_IFACE | grep -Po "\\d+\\.\\d+\\.\\d+\\.\\d+")
  if [ -n "${WLAN_IFACE_IP}" ]; then
    echo "Got it!"
    break
  fi
  echo "Waiting for $WLAN_IFACE to get an IP..."
  sleep 5
done

systemctl start systemd-resolved
systemctl stop dnsmasq
echo "Reset DNS services."

echo -e "\nConnecting to WiFi..."

WPA_SUPP_FILE="/etc/wpa_supplicant/wpa_supplicant-$WLAN_IFACE.conf"
cat >"$WPA_SUPP_FILE" <<EOF
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=USifconfig $WLAN_IFACE
network={
 ssid="$WIFI_SSID"
 scan_ssid=1
 key_mgmt=WPA-EAP
 eap=PEAP
 identity="$WIFI_USERNAME"
 password="$WIFI_PWD"
 phase1="peaplabel=0"
 phase2="auth=MSCHAPV2"
}
EOF
chmod 600 "$WPA_SUPP_FILE"
echo "Created wpa_supplicant: $WPA_SUPP_FILE"
systemctl disable wpa_supplicant.service
systemctl stop wpa_supplicant.service
systemctl enable --now wpa_supplicant@$WLAN_IFACE.service
systemctl status --no-pager wpa_supplicant@$WLAN_IFACE.service
echo ""
ifconfig $WLAN_IFACE

echo -e "\n\n"
ifconfig $WLAN_IFACE
NET_CONF_FILE="/etc/systemd/network/08-$WLAN_IFACE.network"
cat >"$NET_CONF_FILE" <<EOF
[Match]
Name=$WLAN_IFACE
[Network]
IPForward=yes
DHCP=yes
EOF
echo "Created network config for the $WLAN_IFACE WiFi interface."

echo "Restarting systemd-networkd..."
systemctl restart systemd-networkd.service