#!/usr/bin/env bash
# install-client.sh -- deploy NUT network-slave config
# Usage: sudo ./install-client.sh <MASTER_IP>
# ASCII only.

set -euo pipefail

SRC="$(cd "$(dirname "$0")" && pwd)/client/etc/nut"
DST="/etc/nut"

if [ "$(id -u)" -ne 0 ]; then
    echo "ERROR: run as root (sudo)." >&2
    exit 1
fi

MASTER_IP="${1:-}"
if [ -z "$MASTER_IP" ]; then
    echo "Usage: sudo $0 <MASTER_IP>" >&2
    exit 1
fi

echo "== Installing NUT (if missing) =="
if command -v apt-get >/dev/null 2>&1; then
    apt-get update && apt-get install -y nut
elif command -v dnf >/dev/null 2>&1; then
    dnf install -y nut
else
    echo "WARN: unknown package manager, install 'nut' manually." >&2
fi

echo "== Copying client config to ${DST} =="
install -d "$DST"
cp -v "$SRC/nut.conf" "$DST/nut.conf"
sed "s/MASTER_IP/${MASTER_IP}/" "$SRC/upsmon.conf" > "$DST/upsmon.conf"

chown root:nut "$DST/upsmon.conf" 2>/dev/null || true
chmod 640 "$DST/upsmon.conf"

echo
echo "NEXT STEPS (manual):"
echo "  1. Edit ${DST}/upsmon.conf -- replace CHANGE_ME_SLAVE with the master's monslave password."
echo "  2. Enable the monitor service:"
echo "       systemctl enable --now nut-monitor"
echo "  3. Verify connectivity to the master:"
echo "       upsc ups@${MASTER_IP}"