import json
import zipfile
from itertools import chain
from pathlib import Path
from joblib import Parallel, delayed
from realfake.utils import get_user_name, inject_args, Args


class UnpackParams(Args):
    meta_file: Path
    jsonl_file: Path
    num_workers: int = 16


def unpack(zip_path: Path, output_dir: Path):
    print("extracting", zip_path)
    with zipfile.ZipFile(zip_path, "r") as arch:
        paths = [str(output_dir/fn) for fn in arch.namelist() if fn.endswith(".png")]
        arch.extractall(output_dir)
    return paths


@inject_args
def main(params: UnpackParams) -> None:
    subset_name = params.meta_file.stem
    output_dir = Path(f"/fsx/{get_user_name()}/data/fake_{subset_name}")
    output_dir.mkdir(parents=True, exist_ok=True)
    meta = json.loads(params.meta_file.read_text())
    with Parallel(n_jobs=params.num_workers, verbose=100) as parallel:
        results = parallel(delayed(unpack)(Path(m["path"]), output_dir) for m in meta if m["ok"])
    records = [
        {"path": str(fn), "label": "fake", "class": None, "valid": None}
        for fn in chain.from_iterable(results)
    ]
    with params.jsonl_file.open("w") as fp:
        for record in records:
            fp.write(json.dumps(record) + "\n")


if __name__ == "__main__":
    main()