import json
import datasets
from datasets import load_dataset
from datasets.tasks import Summarization

logger = datasets.logging.get_logger(__name__)
_DESCRIPTION = """
[JaQuAD](https://github.com/SkelterLabsInc/JaQuAD) dataset for question generation (QG) task. The test set of the original 
data is not publicly released, so we randomly sampled test questions from the training set.
"""
_URL = 'https://huggingface.co/datasets/asahi417/qg_jaquad/raw/main/data/processed'
_URLS = {
    'train': ['{}/train{:02d}.jsonl'.format(_URL, i) for i in range(28)],
    'test': ['{}/test{:02d}.jsonl'.format(_URL, i) for i in range(4)],
    'validation': ['{}/validation{:02d}.jsonl'.format(_URL, i) for i in range(4)]
}


class QGJaquadConfig(datasets.BuilderConfig):
    """BuilderConfig for SquadQG"""

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


class QGJaquad(datasets.GeneratorBasedBuilder):

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "answer": datasets.Value("string"),
                    "question": datasets.Value("string"),
                    "sentence": datasets.Value("string"),
                    "passage": datasets.Value("string"),
                    "sentence_answer": datasets.Value("string"),
                    "passage_answer": datasets.Value("string"),
                    "passage_sentence": datasets.Value("string")
                }
            ),
            supervised_keys=None,
            task_templates=[
                Summarization(task='question generation', text_column="passage_answer", summary_column='question')
            ],
            homepage="https://github.com/asahi417/lm-question-generation"
        )

    def _split_generators(self, dl_manager):
        downloaded_file = dl_manager.download_and_extract(_URLS)
        return [
            datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"filepaths": downloaded_file["train"]}),
            datasets.SplitGenerator(name=datasets.Split.VALIDATION, gen_kwargs={"filepaths": downloaded_file["validation"]}),
            datasets.SplitGenerator(name=datasets.Split.TEST, gen_kwargs={"filepaths": downloaded_file["test"]}),
        ]

    def _generate_examples(self, filepaths):
        _key = 0
        for filepath in filepaths:
            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