import datasets
import os
import logging
import lm_dataformat


_DESC = """
BinhVQ news corpus version 2021 (~20M records)

https://github.com/binhvq/news-corpus

Preprocessed:
    - Read mongo dump and export to jsonl
    - Clean content with Beautifulsoup
    - Concatenate title, sapo and content
    - Remove exact match sha256
    - Shuffle and split train / val (0.01)

**IMPORTANT**: Please run `pip install lm_dataformat` before load this dataset

"""

_REPO_URL = "https://huggingface.co/datasets/imthanhlv/binhvq_dedup/tree/main/"
_URLS = {
    "val": "val.jsonl.zst",
}


try:
    import lm_dataformat
except ImportError:
    print(
        "Can't import lm_dataformat, please run pip install lm_dataformat and try again"
    )
    exit()


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


class Binhvq(datasets.GeneratorBasedBuilder):
    BUILDER_CONFIGS = [
        BinhvqConfig(
            name="plain_text",
            version=datasets.Version("1.0.0", ""),
            description="Plain text",
        ),
    ]

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESC,
            features=datasets.Features({"text": datasets.Value("string")}),
            homepage="https://github.com/binhvq/news-corpus",
        )

    def _split_generators(self, dl_manager):
        downloaded_files = dl_manager.download_and_extract(_URLS)
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={"filepath": downloaded_files["val"]},
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                gen_kwargs={"filepath": downloaded_files["val"]},
            ),
        ]

    def _generate_examples(self, filepath):
        logging.info(f"Generating examples from {filepath}")
        reader = lm_dataformat.Reader(filepath)
        for doc in reader.stream_data():
            yield {"text": doc}