#!/usr/bin/env python3
"""Download the selected CV-ICRL training histories without deserializing them."""
import argparse
import json
from pathlib import Path


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--repo-id', default='bluixe/CV-ICRL')
    parser.add_argument('--revision', default='camera-ready-v1')
    parser.add_argument('--family', choices=['all', 'minigrid', 'procgen'], default='all')
    parser.add_argument('--task', action='append', help='Exact task/game name; repeat to select several.')
    parser.add_argument('--output-dir', type=Path, default=Path('datasets'))
    parser.add_argument('--manifest', type=Path, default=Path(__file__).with_name('manifest.json'))
    parser.add_argument('--dry-run', action='store_true')
    args = parser.parse_args()
    manifest = json.loads(args.manifest.read_text())
    files = [f for f in manifest['files'] if args.family == 'all' or f['family'].lower() == args.family]
    if args.task:
        unknown = set(args.task) - {f['task'] for f in files}
        if unknown:
            parser.error('Unknown task(s) for selected family: ' + ', '.join(sorted(unknown)))
        files = [f for f in files if f['task'] in args.task]
    if not files:
        parser.error('No files selected.')
    total = sum(f['size_bytes'] for f in files)
    print(f'{len(files)} files; {total:,} bytes ({total / 2**30:.2f} GiB)')
    for f in files:
        print(f"{f['path']} -> {args.output_dir / f['path']}")
    if args.dry_run:
        return
    from huggingface_hub import HfApi, hf_hub_download
    info = HfApi().dataset_info(args.repo_id, revision=args.revision, files_metadata=True)
    available = {f.rfilename: f.size for f in info.siblings}
    missing = [f['path'] for f in files if available.get(f['path']) != f['size_bytes']]
    if missing:
        raise SystemExit('Selected files are missing or incomplete at this revision: ' + ', '.join(missing))
    print(f'Fixed download revision: {info.sha}')
    for f in files:
        path = Path(hf_hub_download(repo_id=args.repo_id, repo_type='dataset', revision=info.sha,
                                   filename=f['path'], local_dir=args.output_dir))
        if path.stat().st_size != f['size_bytes']:
            raise SystemExit('Downloaded size mismatch: ' + f['path'])
        print('Verified byte length: ' + f['path'])
    print('All selected files downloaded and byte lengths verified.')


if __name__ == '__main__':
    main()