import json
import os

import datasets

_OPEN_SLU_CITATION = """\
xxx"""

_OPEN_SLU_DESCRIPTION = """\
xxx"""

_ATIS_CITATION = """\
@inproceedings{hemphill1990atis,
	title = "The {ATIS} Spoken Language Systems Pilot Corpus",
	author = "Hemphill, Charles T.  and
	Godfrey, John J.  and
	Doddington, George R.",
	booktitle = "Speech and Natural Language: Proceedings of a Workshop Held at Hidden Valley, {P}ennsylvania, June 24-27,1990",
	year = "1990",
	url = "https://aclanthology.org/H90-1021",
}
"""

_ATIS_DESCRIPTION = """\
 A widely used SLU corpus for single-intent SLU.
"""


class OpenSLUConfig(datasets.BuilderConfig):
    """BuilderConfig for OpenSLU."""

    def __init__(self, features, data_url, citation, url, intent_label_classes=None, slot_label_classes=None, **kwargs):
        """BuilderConfig for OpenSLU.
        Args:
          features: `list[string]`, list of the features that will appear in the
            feature dict. Should not include "label".
          data_url: `string`, url to download the zip file from.
          citation: `string`, citation for the data set.
          url: `string`, url for information about the data set.
          intent_label_classes: `list[string]`, the list of classes for the intent label
          slot_label_classes: `list[string]`, the list of classes for the slot label
          **kwargs: keyword arguments forwarded to super.
        """
        # Version history:
        # 0.0.1: Initial version.
        super(OpenSLUConfig, self).__init__(version=datasets.Version("0.0.1"), **kwargs)
        self.features = features
        self.intent_label_classes = intent_label_classes
        self.slot_label_classes = slot_label_classes
        self.data_url = data_url
        self.citation = citation
        self.url = url


class OpenSLU(datasets.GeneratorBasedBuilder):
    """The SuperGLUE benchmark."""

    BUILDER_CONFIGS = [
        OpenSLUConfig(
            name="products",
            description=_ATIS_DESCRIPTION,
            features=["text"],
            data_url="https://huggingface.co/datasets/rams901/OpenSLU_Clone/resolve/main/prods_v1.tar.gz",
            citation=_ATIS_CITATION,
            url="https://aclanthology.org/H90-1021",
        ),
    ]

    def _info(self):
        features = {feature: datasets.Sequence(datasets.Value("string")) for feature in self.config.features}
        features["slot"] = datasets.Sequence(datasets.Value("string"))
        features["intent"] = datasets.Value("string")

        return datasets.DatasetInfo(
            description=_OPEN_SLU_DESCRIPTION + self.config.description,
            features=datasets.Features(features),
            homepage=self.config.url,
            citation=self.config.citation + "\n" + _OPEN_SLU_CITATION,
        )

    def _split_generators(self, dl_manager):
        print(self.config.data_url)
        dl_dir = dl_manager.download_and_extract(self.config.data_url) or ""

        task_name = _get_task_name_from_data_url(self.config.data_url)
        print(dl_dir)
        print(task_name)
        dl_dir = os.path.join(dl_dir, task_name)
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "data_file": os.path.join(dl_dir, "train.jsonl"),
                    "split": datasets.Split.TRAIN,
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                gen_kwargs={
                    "data_file": os.path.join(dl_dir, "dev.jsonl"),
                    "split": datasets.Split.VALIDATION,
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={
                    "data_file": os.path.join(dl_dir, "test.jsonl"),
                    "split": datasets.Split.TEST,
                },
            ),
        ]

    def _generate_examples(self, data_file, split):
        with open(data_file, encoding="utf-8") as f:
            for index, line in enumerate(f):
                row = json.loads(line)
                yield index, row


def _cast_label(label):
    """Converts the label into the appropriate string version."""
    if isinstance(label, str):
        return label
    elif isinstance(label, bool):
        return "True" if label else "False"
    elif isinstance(label, int):
        assert label in (0, 1)
        return str(label)
    else:
        raise ValueError("Invalid label format.")


def _get_record_entities(passage):
    """Returns the unique set of entities."""
    text = passage["text"]
    entity_spans = list()
    for entity in passage["entities"]:
        entity_text = text[entity["start"]: entity["end"] + 1]
        entity_spans.append({"text": entity_text, "start": entity["start"], "end": entity["end"] + 1})
    entity_spans = sorted(entity_spans, key=lambda e: e["start"])  # sort by start index
    entity_texts = set(e["text"] for e in entity_spans)  # for backward compatability
    return entity_texts, entity_spans


def _get_record_answers(qa):
    """Returns the unique set of answers."""
    if "answers" not in qa:
        return []
    answers = set()
    for answer in qa["answers"]:
        answers.add(answer["text"])
    return sorted(answers)


def _get_task_name_from_data_url(data_url):
    return data_url.split("/")[-1].split(".")[0]