"""TriviaQA (official source: mandarjoshi/trivia_qa, rc.nocontext config)."""

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


@register_dataset(
    DatasetSpec(
        name='trivia_qa',
        source='mandarjoshi/trivia_qa',  # official: https://huggingface.co/datasets/mandarjoshi/trivia_qa
        subset='rc.nocontext',
        split='validation',
        task_type='qa',
        tags=['knowledge', 'openqa'],
        description='TriviaQA open-domain QA without context (official).',
    )
)
def trivia_qa():
    def to_sample(record: dict) -> Sample:
        answer = record['answer']  # {'value': ..., 'aliases': [...], ...}
        targets = [answer['value']] + list(answer.get('aliases') or [])
        return Sample(
            input=record['question'],
            target=targets,  # multi-target: any alias counts
            metadata={'question_id': record.get('question_id')},
        )

    return to_sample