#!/bin/sh

# Check if container name is provided
if [ -z "$1" ]; then
    echo "Usage: $0 <container_name> [--exclude=<DIR_NAME>]"
    echo "Example: $0 immich"
    echo "Example: $0 immich --exclude=immich/nasphoto"
    exit 1
fi

DOCKER_DIR="/DATA01/dockers"
CONTAINER_NAME="$1"
CONTAINER_DIR="$DOCKER_DIR/$CONTAINER_NAME"
EXCLUDE_OPTION=""

# Parse exclude option if provided
if [ -n "$2" ]; then
    case "$2" in
        --exclude=*)
            EXCLUDE_DIR="${2#--exclude=}"
            EXCLUDE_OPTION="--exclude $EXCLUDE_DIR"
            ;;
        *)
            echo "錯誤: 無效的參數: $2"
            echo "Usage: $0 <container_name> [--exclude=<DIR_NAME>]"
            exit 1
            ;;
    esac
fi

# Check if container directory exists
if [ ! -d "$CONTAINER_DIR" ]; then
    echo "錯誤: 容器目錄不存在: $CONTAINER_DIR"
    echo "無法備份一個目錄不存在的 docker"
    exit 1
fi

echo "$(date +'%F %R:%S'): Backup start."
SAVE_PATH="/nas/Backup/backup_docker/$CONTAINER_NAME/files"
NOW_DATETIME="$(date +'%Y%m%d_%H%M%S')"
BACKUP_FILENAME="backup_${CONTAINER_NAME}_$NOW_DATETIME.tar"
BACKUP_FILE_PATH="$SAVE_PATH/$BACKUP_FILENAME"
BACKUP_CMD="sudo tar -cv $EXCLUDE_OPTION -f $BACKUP_FILENAME $CONTAINER_NAME"

echo "DOCKER_DIR:       $DOCKER_DIR"
echo "CONTAINER_DIR:    $CONTAINER_DIR"
echo "SAVE_PATH:        $SAVE_PATH"
echo "NOW_DATETIME:     $NOW_DATETIME"
echo "BACKUP_FILENAME:  $BACKUP_FILENAME"
echo "BACKUP_FILE_PATH: $BACKUP_FILE_PATH"
echo "BACKUP_CMD:       $BACKUP_CMD"
echo "$(date +'%F %R:%S'): Backup start. BACKUP_CMD = $BACKUP_CMD"
echo pwd=$(pwd)

mkdir -p $SAVE_PATH

## Clean up old backups before creating new one, keep only the newest 4 files
echo "$(date +'%F %R:%S'): Cleaning up old backups before backup..."
/home/awin/scripts/newestN.sh -d="$SAVE_PATH" -n=4 --confirm=0

sudo docker compose -f ${CONTAINER_DIR}/docker-compose.yml down
cd $DOCKER_DIR
$BACKUP_CMD
sudo docker compose -f ${CONTAINER_DIR}/docker-compose.yml up -d

## Move BACKUP_FILENAME to BACKUP_FILE_PATH
echo "rsync -avh --progress $BACKUP_FILENAME $SAVE_PATH"
rsync -ah --progress $BACKUP_FILENAME $SAVE_PATH

## Delete local backup file
echo "rm $BACKUP_FILENAME"
rm -f $BACKUP_FILENAME

echo "$(date +'%F %R:%S'): Backup finished."