"""Load a downloaded ImageFolder snapshot and check its full ID population."""
import argparse
import json
from pathlib import Path
from datasets import Image, load_dataset


def load(root):
    dataset = load_dataset("imagefolder", data_dir=str(root / "data"),
                           split="test", drop_labels=True)
    expected = {json.loads(line)["image_id"] for line in
                (root / "release/image_manifest.jsonl").read_text().splitlines()}
    assert len(dataset) == 11534
    assert set(dataset["image_id"]) == expected
    assert "label" not in dataset.column_names, "Shard directory names are not labels"
    row = dataset[0]
    assert row["image"].size == (row["width"], row["height"])
    streamed = load_dataset("imagefolder", data_dir=str(root / "data"),
                            split="test", drop_labels=True, streaming=True)
    streamed = streamed.cast_column("image", Image(decode=False))
    assert {row["image_id"] for row in streamed} == expected
    print(f"Loaded {len(dataset):,} images; full streaming ID population matches.")
    return dataset


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--root", type=Path, default=Path(__file__).resolve().parents[1])
    load(parser.parse_args().root.resolve())