"""BIG-Bench Hard (standard mirror: lukaemon/bbh; original: github.com/suzgunmirac/BIG-Bench-Hard).

Paper-faithful 3-shot CoT: the official hand-written exemplars (vendored in
_bbh_cot_prompts.py, MIT) are injected per-subtask via few_shot hook.
"""

from ..sample import Sample
from ..registry import register_dataset
from ..spec import DatasetSpec


def bbh_few_shot(split: str, subset: str, n: int):
    """Return the official 3-shot CoT prompt text for this subtask."""
    if n <= 0:
        return None
    from ._bbh_cot_prompts import COT_PROMPTS

    text = COT_PROMPTS.get(subset)
    return text.strip() + '\n\n' if text else None


@register_dataset(
    DatasetSpec(
        name='bbh',
        source='lukaemon/bbh',  # https://huggingface.co/datasets/lukaemon/bbh
        subset='boolean_expressions',  # 27 subtasks; override with --subset <subtask>
        split='test',
        task_type='qa',
        tags=['reasoning'],
        description='BIG-Bench Hard, 27 subtasks (each subset caches under bbh/<hash>).',
        few_shot_split='official_cot',  # -> bbh_few_shot hook (3-shot official CoT)
    )
)
def bbh():
    def to_sample(record: dict) -> Sample:
        return Sample(input=record['input'], target=str(record['target']).strip())

    return to_sample