import os 

def main():
    import argparse

    parser = argparse.ArgumentParser(
        description="Rename BraTS2023 case files to short names (t1c/t1n/t2f/t2w/seg.nii.gz)."
    )
    parser.add_argument(
        "--data_dir",
        type=str,
        default="./data/raw_data/BraTS2023/ASNR-MICCAI-BraTS2023-GLI-Challenge-TrainingData/",
        help="BraTS2023 directory that contains case folders.",
    )
    args = parser.parse_args()

    data_dir = args.data_dir
    if not os.path.isdir(data_dir):
        raise FileNotFoundError(f"data_dir not found: {data_dir}")

    all_cases = sorted(os.listdir(data_dir))
    for case_name in all_cases:
        case_dir = os.path.join(data_dir, case_name)
        if not os.path.isdir(case_dir):
            continue

        for data_name in os.listdir(case_dir):
            if "-" not in data_name:
                continue

            new_name = data_name.split("-")[-1]
            new_path = os.path.join(case_dir, new_name)
            old_path = os.path.join(case_dir, data_name)

            if os.path.exists(new_path):
                # already renamed (or conflict). Skip to be safe.
                continue

            os.rename(old_path, new_path)
            print(f"{new_path} 命名成功")


if __name__ == "__main__":
    main()