#!/bin/bash

set -e

INTERFACE="enp5s0"
LOCAL_IP_SUFFIX=100
LOCAL_PATH="./WisGateOS_2.2.13_RAK_b198_RAK636.rwi"
REMOTE_PATH=" /tmp/WisGateOS_2.2.13_RAK_b198_RAK636.rwi"
REMOTE_USER="root"
SSH_OPTIONS="-o StrictHostKeyChecking=no"
echo "🔎 Pobieram MAC adres swojego interfejsu..."

OWN_MAC=$(cat /sys/class/net/${INTERFACE}/address | tr '[:lower:]' '[:upper:]')

echo "✅ Własny MAC interfejsu $INTERFACE: $OWN_MAC"

echo "🎧 Podsłuchuję DHCP pakiety, czekam na bramę..."

DEVICE_MAC=$(sudo timeout 60 tcpdump -i $INTERFACE -nn -l -v udp port 67 or udp port 68 \
    2>/dev/null | \
    grep -oEi '([0-9a-f]{2}:){5}[0-9a-f]{2}' | \
    grep -vi "$OWN_MAC" | \
    head -n1)

if [ -z "$DEVICE_MAC" ]; then
    echo "❌ Nie udało się znaleźć żadnego pakietu DHCP poza własnym interfejsem."
    exit 1
fi

echo "✅ Znaleziony MAC bramy: $DEVICE_MAC"

# Rozbij MAC na bajty
IFS=':' read -ra mac_bytes <<< "$DEVICE_MAC"
LAST_B1=${mac_bytes[4]}
LAST_B2=${mac_bytes[5]}

LAST_B1_DEC=$((16#${LAST_B1}))
LAST_B2_DEC=$((16#${LAST_B2}))

GATEWAY_IP="169.254.${LAST_B1_DEC}.${LAST_B2_DEC}"
LOCAL_IP="169.254.${LAST_B1_DEC}.${LOCAL_IP_SUFFIX}"

echo "🌐 Gateway IP: $GATEWAY_IP"
echo "🌐 Local IP:  $LOCAL_IP"

echo "⚙️ Konfiguruję interfejs $INTERFACE..."

# Ustawiamy IP lokalne
sudo ip addr flush dev $INTERFACE
sudo ip addr add ${LOCAL_IP}/24 dev $INTERFACE
sudo ip link set $INTERFACE up

echo "✅ Interfejs skonfigurowany."

#Wgrywanie nowego FW     
echo "📤 Kopiuję plik ${LOCAL_PATH} na urządzenie..."
ssh $SSH_OPTIONS ${REMOTE_USER}@${GATEWAY_IP} "cat > ${REMOTE_PATH}" < $LOCAL_PATH
echo "✅ Plik skopiowany."

ssh $SSH_OPTIONS ${REMOTE_USER}@${GATEWAY_IP} "\
sysupgrade ${REMOTE_PATH}"
echo "✅ System upgraded successfull."
echo "🎉 Wszystko gotowe!"