"""A wine-ratings dataset"""

import csv

import datasets


_CITATION = """\
@InProceedings{huggingface:dataset,
title = {A wine ratings dataset from regions around the world},
author={Alfredo Deza
},
year={2022}
}
"""

_DESCRIPTION = """\
This is a dataset for wines in various regions around the world with names, regions, ratings and descriptions
"""

_HOMEPAGE = "https://github.com/paiml/wine-ratings"

_LICENSE = "MIT"

class WineRatings(datasets.GeneratorBasedBuilder):

    VERSION = datasets.Version("0.0.1")

    def _info(self):
        features = datasets.Features(
            {
                "name": datasets.Value("string"),
                "region": datasets.Value("string"),
                "variety": datasets.Value("string"),
                "rating": datasets.Value("float"),
                "notes": datasets.Value("string"),
            }
        )
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            homepage=_HOMEPAGE,
            license=_LICENSE,
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):

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

    # method parameters are unpacked from `gen_kwargs` as given in `_split_generators`
    def _generate_examples(self, filepath, split):
        with open(filepath, encoding="utf-8") as f:
            csv_reader = csv.reader(f, delimiter=",")
            next(csv_reader)
            for id_, row in enumerate(csv_reader):
                yield id_, {
                    "name": row[0],
                    "region": row[1],
                    "variety": row[2],
                    "rating": row[3],
                    "notes": row[4],
                }