import json
import datasets
from datasets.tasks import QuestionAnsweringExtractive


logger = datasets.logging.get_logger(__name__)
_VERSION = "0.0.2"
_NAME = "qa_squad"
_DESCRIPTION = """SQuAD with the train/validation/test split used in SQuAD QG"""
_CITATION = """
@article{2016arXiv160605250R,
       author = {{Rajpurkar}, Pranav and {Zhang}, Jian and {Lopyrev},
                 Konstantin and {Liang}, Percy},
        title = "{SQuAD: 100,000+ Questions for Machine Comprehension of Text}",
      journal = {arXiv e-prints},
         year = 2016,
          eid = {arXiv:1606.05250},
        pages = {arXiv:1606.05250},
archivePrefix = {arXiv},
       eprint = {1606.05250},
}
"""
_BASE_URL = "https://huggingface.co/datasets/lmqg/qa_squad/resolve/main/datasets"
_URLS = {k: f'{_BASE_URL}/{k}.jsonl' for k in
         [str(datasets.Split.TEST), str(datasets.Split.TRAIN), str(datasets.Split.VALIDATION)]}


class QASquadConfig(datasets.BuilderConfig):
    """BuilderConfig"""

    def __init__(self, **kwargs):
        """BuilderConfig
        Args:
          **kwargs: keyword arguments forwarded to super.
        """
        super(QASquadConfig, self).__init__(**kwargs)


class QASquad(datasets.GeneratorBasedBuilder):

    BUILDER_CONFIGS = [
        QASquadConfig(name=_NAME, version=datasets.Version(_VERSION), description=_DESCRIPTION),
    ]
    
    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "id": datasets.Value("string"),
                    "title": datasets.Value("string"),
                    "context": datasets.Value("string"),
                    "question": datasets.Value("string"),
                    "answers": datasets.features.Sequence(
                        {
                            "text": datasets.Value("string"),
                            "answer_start": datasets.Value("int32"),
                        }
                    ),
                }
            ),
            supervised_keys=None,
            homepage="https://github.com/asahi417/lm-question-generation",
            task_templates=[
                QuestionAnsweringExtractive(
                    question_column="question", context_column="context", answers_column="answers"
                )
            ],
        )

    def _split_generators(self, dl_manager):
        downloaded_file = dl_manager.download_and_extract(_URLS)
        return [datasets.SplitGenerator(name=i, gen_kwargs={"filepath": downloaded_file[str(i)]})
                for i in [datasets.Split.TRAIN, datasets.Split.VALIDATION, datasets.Split.TEST]]

    def _generate_examples(self, filepath):
        """This function returns the examples in the raw (text) form."""
        _key = 0
        logger.info("generating examples from = %s", filepath)
        with open(filepath, encoding="utf-8") as f:
            _list = f.read().split('\n')
            if _list[-1] == '':
                _list = _list[:-1]
            for i in _list:
                data = json.loads(i)
                yield _key, data
                _key += 1