#!/bin/sh
set -eu

PROJECT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
cd "$PROJECT_DIR"

CONTAINER_ID=$(docker compose ps -q rustfs)
if [ -z "$CONTAINER_ID" ]; then
    echo "Error: The MineSeeker RustFS service is not running."
    exit 1
fi

VOLUME_NAME=$(docker inspect "$CONTAINER_ID" --format '{{range .Mounts}}{{if eq .Destination "/data"}}{{.Name}}{{end}}{{end}}')
if [ -z "$VOLUME_NAME" ]; then
    echo "Error: Could not determine the RustFS data volume."
    exit 1
fi

BACKUP_DIR=${1:-"$PROJECT_DIR/backups"}
mkdir -p "$BACKUP_DIR"
BACKUP_DIR=$(CDPATH= cd -- "$BACKUP_DIR" && pwd)
TIMESTAMP=$(date +%Y-%m-%d.%H%M%S)
BACKUP_FILE="mineseeker-rustfs.${TIMESTAMP}.tar.gz"
BACKUP_PATH="$BACKUP_DIR/$BACKUP_FILE"
TEMP_PATH="$BACKUP_PATH.tmp"

umask 077
APP_WAS_RUNNING=0
SCHEDULER_WAS_RUNNING=0
RUSTFS_WAS_RUNNING=1
[ -z "$(docker compose ps -q app)" ] || APP_WAS_RUNNING=1
[ -z "$(docker compose ps -q scheduler)" ] || SCHEDULER_WAS_RUNNING=1

restart_services() {
    result=$?
    rm -f "$TEMP_PATH"
    [ "$RUSTFS_WAS_RUNNING" -eq 0 ] || docker compose start rustfs || true
    [ "$APP_WAS_RUNNING" -eq 0 ] || docker compose start app || true
    [ "$SCHEDULER_WAS_RUNNING" -eq 0 ] || docker compose start scheduler || true
    return "$result"
}
trap restart_services EXIT

echo "Stopping MineSeeker writers and RustFS for a consistent backup..."
docker compose stop app scheduler rustfs

echo "Creating RustFS backup: $BACKUP_PATH"
docker run --rm \
    --volume "$VOLUME_NAME:/data:ro" \
    --volume "$BACKUP_DIR:/backup" \
    busybox tar czf "/backup/$BACKUP_FILE.tmp" -C /data .
mv "$TEMP_PATH" "$BACKUP_PATH"

echo "Backup complete: $BACKUP_PATH"