import dataclasses
import itertools
from pathlib import Path
from typing import List

import datasets

datasets.logging.set_verbosity_info()

_DESCRIPTION = """\
Dataset of music tablature, in alphaTex (https://alphatab.net/docs/alphatex) 
format, converted from Guitar Pro files (gp3, gp4, gp5, which are downloaded 
from https://rutracker.org/forum/viewtopic.php?t=2888130
"""


class Builder(datasets.GeneratorBasedBuilder):
    VERSION = datasets.Version("1.5.0")

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "text": datasets.Value("string"),
                    "file": datasets.Value("string"),
                }
            ),
        )

    def _split_generators(self, dl_manager: datasets.DownloadManager):
        data_dir = dl_manager.download_and_extract("data.zip")
        if paths := list(Path(data_dir).glob("**/*.tex")):
            print(f"Found {len(paths)} AlphaTex files")
        else:
            raise ValueError(f"No GP files found in {data_dir}")

        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "filepaths": paths,
                },
            ),
        ]

    def _generate_examples(self, filepaths):
        for idx, path in enumerate(filepaths):
            with open(path) as f:
                yield idx, {"file": path.name, "text": f.read()}