#!/usr/bin/env bash
set -euo pipefail

HEARTBEAT=/etc/lesavka/watchdog.touch
MAX_AGE_SEC=${LESAVKA_WATCHDOG_MAX_AGE:-840}

if [[ -f /etc/lesavka/no-reboot ]]; then
    exit 0
fi

now=$(date +%s)
if [[ ! -f "$HEARTBEAT" ]]; then
    logger -t lesavka-watchdog "no heartbeat file; rebooting"
    systemctl --no-wall reboot
    exit 0
fi

mtime=$(stat -c %Y "$HEARTBEAT" 2>/dev/null || echo 0)
age=$((now - mtime))
if (( age > MAX_AGE_SEC )); then
    logger -t lesavka-watchdog "heartbeat stale (${age}s); rebooting"
    systemctl --no-wall reboot
fi