#!/bin/bash
# apply_network.sh — Configure le réseau via NetworkManager
# Usage: apply_network.sh dhcp
#    ou: apply_network.sh static <ip/prefix> <gateway> <dns>
# Exemple: apply_network.sh static 192.168.1.100/24 192.168.1.1 8.8.8.8,1.1.1.1

set -e

MODE="$1"
CON="Wired connection 1"

# Trouve la connexion active si le nom par défaut a changé
if ! nmcli con show "$CON" &>/dev/null; then
    CON=$(nmcli -t -f NAME,TYPE con show --active | grep ethernet | cut -d: -f1 | head -1)
fi

[[ -z "$CON" ]] && echo "Aucune connexion Ethernet trouvée." && exit 1

if [[ "$MODE" == "dhcp" ]]; then
    nmcli con mod "$CON" ipv4.method auto ipv4.addresses "" ipv4.gateway "" ipv4.dns ""
    nmcli con up "$CON"
    echo "OK: mode DHCP appliqué."

elif [[ "$MODE" == "static" ]]; then
    IP_PREFIX="$2"   # ex: 192.168.1.100/24
    GATEWAY="$3"     # ex: 192.168.1.1
    DNS="$4"         # ex: 8.8.8.8,1.1.1.1

    [[ -z "$IP_PREFIX" || -z "$GATEWAY" ]] && echo "IP et gateway requis." && exit 1

    nmcli con mod "$CON" \
        ipv4.method manual \
        ipv4.addresses "$IP_PREFIX" \
        ipv4.gateway "$GATEWAY" \
        ipv4.dns "${DNS:-8.8.8.8,1.1.1.1}"
    nmcli con up "$CON"
    echo "OK: IP statique $IP_PREFIX appliquée."

else
    echo "Usage: $0 dhcp | static <ip/prefix> <gateway> [dns]" && exit 1
fi