#!/usr/bin/env bash
# Usage: ./backup.sh [label]
# Creates backups/world-YYYY-MM-DD-HHMM[-label].tar.gz
# If the container is running, flushes world via rcon and archives via
# docker exec. If not, archives data/world from the host directly.
set -euo pipefail

cd "$(dirname "$0")"

LABEL="${1:-}"
STAMP="$(date +%Y-%m-%d-%H%M)"
SUFFIX="${LABEL:+-$LABEL}"
OUT="backups/world-${STAMP}${SUFFIX}.tar.gz"

mkdir -p backups

if docker ps --format '{{.Names}}' | grep -qx minecraft; then
    echo "Server running — flushing world via rcon..."
    docker exec minecraft rcon-cli save-off >/dev/null
    docker exec minecraft rcon-cli save-all flush >/dev/null
    trap 'docker exec minecraft rcon-cli save-on >/dev/null || true' EXIT

    echo "Archiving /data/world -> ${OUT}"
    docker exec minecraft tar -czf - -C /data world > "${OUT}"
else
    echo "Server not running — archiving data/world from host."
    tar -czf "${OUT}" -C data world
fi

echo "Done."
ls -lh "${OUT}"