# coding=utf-8
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#     http://www.apache.org/licenses/LICENSE-2.0
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"""Swiss-Court-Predict: A Multilingual Legal Judgment Prediction Benchmark"""

import json

import datasets


logger = datasets.logging.get_logger(__name__)

_CITATION = """\
@InProceedings{niklaus-etal-2021-swiss,
  author = {Niklaus, Joel
                and Chalkidis, Ilias
                and Stürmer, Matthias},
  title = {Swiss-Court-Predict: A Multilingual Legal Judgment Prediction Benchmark},
  booktitle = {Proceedings of the 2021 Natural Legal Language Processing Workshop},
  year = {2021},
  location = {Punta Cana, Dominican Republic},
}
@misc{niklaus2022empirical,
    title={An Empirical Study on Cross-X Transfer for Legal Judgment Prediction},
    author={Joel Niklaus and Matthias Stürmer and Ilias Chalkidis},
    year={2022},
    eprint={2209.12325},
    archivePrefix={arXiv},
    primaryClass={cs.CL}
}
"""

_DESCRIPTION = """
Swiss-Judgment-Prediction is a multilingual, diachronic dataset of 85K Swiss Federal Supreme Court (FSCS) cases annotated with the respective binarized judgment outcome (approval/dismissal), posing a challenging text classification task. We also provide additional metadata, i.e., the publication year, the legal area and the canton of origin per case, to promote robustness and fairness studies on the critical area of legal NLP.
"""

_ORIGINAL_LANGUAGES = [
    "de",
    "fr",
    "it",
]
_MT_LANGUAGES = [
    "mt_de",
    "mt_fr",
    "mt_it",
    "mt_en",
]
_LANGUAGES = _ORIGINAL_LANGUAGES + _MT_LANGUAGES

_URL = "https://zenodo.org/record/7109926/files/"
_URLS = {
    "train": _URL + "train.jsonl",
    "train_mt": _URL + "train_mt.jsonl",
    "val": _URL + "val.jsonl",
    "test": _URL + "test.jsonl",
}


class SwissJudgmentPredictionConfig(datasets.BuilderConfig):
    """BuilderConfig for SwissJudgmentPrediction."""

    def __init__(self, language: str, **kwargs):
        """BuilderConfig for SwissJudgmentPrediction.

        Args:
        language: One of de, fr, it, or all, or all+mt
          **kwargs: keyword arguments forwarded to super.
        """
        super(SwissJudgmentPredictionConfig, self).__init__(**kwargs)
        self.language = language


class SwissJudgmentPrediction(datasets.GeneratorBasedBuilder):
    """SwissJudgmentPrediction: A Multilingual Legal Judgment PredictionBenchmark"""

    VERSION = datasets.Version("2.0.0", "")
    BUILDER_CONFIG_CLASS = SwissJudgmentPredictionConfig
    BUILDER_CONFIGS = [
        SwissJudgmentPredictionConfig(
            name=lang,
            language=lang,
            version=datasets.Version("2.0.0", ""),
            description=f"Plain text import of SwissJudgmentPrediction for the {lang} language",
        )
        for lang in _LANGUAGES
    ] + [
        SwissJudgmentPredictionConfig(
            name="all",
            language="all",
            version=datasets.Version("2.0.0", ""),
            description="Plain text import of SwissJudgmentPrediction for all languages",
        ),
        SwissJudgmentPredictionConfig(
            name="all+mt",
            language="all+mt",
            version=datasets.Version("2.0.0", ""),
            description="Plain text import of SwissJudgmentPrediction for all languages with machine translation",
        ),
    ]

    def _info(self):
        features = datasets.Features(
            {
                "id": datasets.Value("int32"),
                "year": datasets.Value("int32"),
                "text": datasets.Value("string"),
                "label": datasets.ClassLabel(names=["dismissal", "approval"]),
                "language": datasets.Value("string"),
                "region": datasets.Value("string"),
                "canton": datasets.Value("string"),
                "legal area": datasets.Value("string"),
                "source_language": datasets.Value("string"),
            }
        )
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            supervised_keys=None,
            homepage="https://github.com/JoelNiklaus/SwissCourtRulingCorpus",
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        # dl_manager is a datasets.download.DownloadManager that can be used to
        # download and extract URLs
        try:
            dl_dir = dl_manager.download(_URLS)
        except Exception:
            logger.warning(
                "This dataset is downloaded through Zenodo which is flaky. "
                "If this download failed try a few times before reporting an issue"
            )
            raise
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                # These kwargs will be passed to _generate_examples
                gen_kwargs={"filepath": dl_dir["train"], "mt_filepath": dl_dir["train_mt"]},
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                # These kwargs will be passed to _generate_examples
                gen_kwargs={"filepath": dl_dir["val"], "mt_filepath": None},
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                # These kwargs will be passed to _generate_examples
                gen_kwargs={"filepath": dl_dir["test"], "mt_filepath": None},
            ),
        ]

    def _generate_examples(self, filepath, mt_filepath):
        """This function returns the examples in the raw (text) form."""
        if self.config.language in ["all", "all+mt"] + _ORIGINAL_LANGUAGES:
            with open(filepath, encoding="utf-8") as f:
                for id_, row in enumerate(f):
                    data = json.loads(row)
                    _ = data.setdefault("source_language", "n/a")
                    if self.config.language in ["all", "all+mt"] or data["language"] == self.config.language:
                        yield id_, data
        if self.config.language in ["all+mt"] + _MT_LANGUAGES:
            if mt_filepath:  # yield data from mt_filepath
                with open(mt_filepath, encoding="utf-8") as f:
                    for id_, row in enumerate(f):
                        data = json.loads(row)
                        _ = data.setdefault("source_language", "n/a")
                        if (
                            self.config.language == "all+mt" or data["language"] in self.config.language
                        ):  # "de" in "mt_de"
                            yield f"mt_{id_}", data