import csv
from ast import literal_eval

import datasets

logger = datasets.logging.get_logger(__name__)

_CITATION = """"""

_DESCRIPTION = """"""

_DOWNLOAD_URLS = {
    "train": "https://huggingface.co/datasets/mahdiyehebrahimi/nerutc/raw/main/nerutc_train.csv",
    "test": "https://huggingface.co/datasets/mahdiyehebrahimi/nerutc/raw/main/nerutc_test.csv",
}


class ParsTwiNERConfig(datasets.BuilderConfig):
    def __init__(self, **kwargs):
        super(ParsTwiNERConfig, self).__init__(**kwargs)


class ParsTwiNER(datasets.GeneratorBasedBuilder):
    BUILDER_CONFIGS = [
        ParsTwiNERConfig(
            name="nerutc",
            version=datasets.Version("1.1.1"),
            description=_DESCRIPTION,
        ),
    ]

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "tokens": datasets.Sequence(datasets.Value("string")),
                    "ner_tags": datasets.Sequence(
                        datasets.features.ClassLabel(
                            names=[
                                "O",
                                "B-UNI",
                                "I-UNI",
                            ]
                        )
                    ),
                }
            ),
            homepage="https://huggingface.co/datasets/mahdiyehebrahimi/nerutc",
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        """
        Return SplitGenerators.
        """

        train_path = dl_manager.download_and_extract(_DOWNLOAD_URLS["train"])
        test_path = dl_manager.download_and_extract(_DOWNLOAD_URLS["test"])

        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN, gen_kwargs={"filepath": train_path}
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST, gen_kwargs={"filepath": test_path}
            ),
        ]

    def _generate_examples(self, filepath):
        logger.info("⏳ Generating examples from = %s", filepath)
        with open(filepath, encoding="utf-8") as csv_file:
            csv_reader = csv.reader(csv_file, quotechar='"', skipinitialspace=True)

            next(csv_reader, None)

            for id_, row in enumerate(csv_reader):
                tokens, ner_tags = row
                # Optional preprocessing here
                tokens = literal_eval(tokens)
                ner_tags = literal_eval(ner_tags)
                yield id_, {"tokens": tokens, "ner_tags": ner_tags}