"""Hello World Dataset - A simple dataset for demonstration purposes."""

import json
import datasets

_DESCRIPTION = """\
Hello World Dataset is a simple demonstration dataset containing various forms 
of "Hello World" text with labels for greeting classification.
"""

_HOMEPAGE = "https://huggingface.co/datasets/chiedo/hello-world"

_LICENSE = "MIT"

_URLS = {
    "train": "train.jsonl",
    "validation": "validation.jsonl",
    "test": "test.jsonl",
}


class HelloWorld(datasets.GeneratorBasedBuilder):
    """Hello World demonstration dataset."""

    VERSION = datasets.Version("1.0.0")

    BUILDER_CONFIGS = [
        datasets.BuilderConfig(name="default", version=VERSION, description="Default configuration"),
    ]

    DEFAULT_CONFIG_NAME = "default"

    def _info(self):
        features = datasets.Features(
            {
                "text": datasets.Value("string"),
                "label": datasets.ClassLabel(names=["greeting", "partial_greeting", "greeting_variant"]),
            }
        )

        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            homepage=_HOMEPAGE,
            license=_LICENSE,
        )

    def _split_generators(self, dl_manager):
        urls = _URLS
        data_dir = dl_manager.download_and_extract(urls)

        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "filepath": data_dir["train"],
                    "split": "train",
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                gen_kwargs={
                    "filepath": data_dir["validation"],
                    "split": "validation",
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={
                    "filepath": data_dir["test"],
                    "split": "test",
                },
            ),
        ]

    def _generate_examples(self, filepath, split):
        with open(filepath, encoding="utf-8") as f:
            for key, row in enumerate(f):
                data = json.loads(row)
                yield key, {
                    "text": data["text"],
                    "label": data["label"],
                }