"""
Download the public dataset from Hugging Face and save it to disk.

Example:
  python scripts/download_hf_dataset.py \
    --dataset ZhangNy/radiology-dataset \
    --split train \
    --output ./hf_dataset_prepared
"""

from __future__ import annotations

import argparse
import sys
from pathlib import Path

# Allow running as `python scripts/*.py` without installing the package.
sys.path.append(str(Path(__file__).resolve().parents[1]))


def main() -> int:
    parser = argparse.ArgumentParser(description="Download HF dataset to local disk")
    parser.add_argument("--dataset", type=str, default="ZhangNy/radiology-dataset", help="HF dataset repo id")
    parser.add_argument("--split", type=str, default="train", help="Dataset split")
    parser.add_argument("--output", type=str, default="./hf_dataset_prepared", help="Output directory (save_to_disk)")
    parser.add_argument("--cache-dir", type=str, default=None, help="Optional datasets cache dir")
    args = parser.parse_args()

    from datasets import load_dataset

    out_dir = Path(args.output)
    out_dir.parent.mkdir(parents=True, exist_ok=True)

    ds = load_dataset(args.dataset, split=args.split, cache_dir=args.cache_dir)
    ds.save_to_disk(str(out_dir))
    print(f"✓ Saved dataset to: {out_dir}  (rows={len(ds)})")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())