#!/usr/bin/env python3
"""
Download LVBench videos from Hugging Face (lmms-lab/LVBench).

Downloads chunked zip files and extracts them.

Usage:
    python download_lvbench.py
    python download_lvbench.py --output-dir /path/to/lvbench
"""

from __future__ import annotations

import argparse
import zipfile
from pathlib import Path

from huggingface_hub import hf_hub_download

REPO_ID = "lmms-lab/LVBench"
DEFAULT_OUTPUT = Path("/opt/dlami/nvme/lvbench")

VIDEO_ZIPS = [f"video_chunks/videos_chunk_{i:03d}.zip" for i in range(1, 15)]


def parse_args() -> argparse.Namespace:
    p = argparse.ArgumentParser(description="Download LVBench from Hugging Face.")
    p.add_argument("--output-dir", type=Path, default=DEFAULT_OUTPUT)
    return p.parse_args()


def download_and_extract(repo_file: str, extract_to: Path, label: str) -> None:
    extract_to.mkdir(parents=True, exist_ok=True)
    print(f"  Downloading {label}: {repo_file} ...")
    local_zip = hf_hub_download(
        repo_id=REPO_ID, filename=repo_file, repo_type="dataset",
    )
    print(f"  Extracting to {extract_to} ...")
    with zipfile.ZipFile(local_zip, "r") as zf:
        zf.extractall(extract_to)
    print(f"  Done: {repo_file}")


def main() -> None:
    args = parse_args()
    out_dir = args.output_dir

    existing = sum(1 for f in out_dir.iterdir() if f.suffix == ".mp4") if out_dir.exists() else 0
    if existing >= 100:
        print(f"[skip] Already have {existing} videos in {out_dir}")
    else:
        print(f"Downloading {len(VIDEO_ZIPS)} video chunks...")
        for i, zf in enumerate(VIDEO_ZIPS, 1):
            download_and_extract(zf, out_dir, f"chunk {i}/{len(VIDEO_ZIPS)}")

    video_count = sum(1 for f in out_dir.iterdir() if f.suffix == ".mp4") if out_dir.exists() else 0
    print(f"\nDone. Total videos on disk: {video_count}")
    print(f"  Videos: {out_dir}")


if __name__ == "__main__":
    main()