import os
import pandas as pd
import zipfile

import datasets
from datasets import load_dataset


class SyntheticCyrillic(datasets.GeneratorBasedBuilder):

    def _info(self):
        return datasets.DatasetInfo(
            features=datasets.Features(
                {
                    "image": datasets.Image(),
                    "text": datasets.Value("string"),
                    "path": datasets.Value("string"),
                    "name": datasets.Value("string")
                }
            )
        )

    def _split_generators(self, dl_manager):
        _URLS = {"img": "img.zip", "labels": "gt.txt"}
        data_paths = dl_manager.download_and_extract(_URLS)

        return [datasets.SplitGenerator(
                    name=datasets.Split.TRAIN,
                    gen_kwargs={
                        "image_paths": dl_manager.iter_files(data_paths["img"]),
                        "labels_path": data_paths["labels"]
                    })]

    def _generate_examples(self, image_paths, labels_path):
        df = pd.read_csv(labels_path, sep=",", names=["path", "text"])
        df["path"] = df.path.str[4:]
        df.set_index("path", inplace=True)

        for image_path in image_paths:
            image_name = os.path.basename(image_path)
 
            if image_name in df.index:

                example = {
                    "image": image_path,
                    "text": df["text"][image_name],
                    "path": image_path,
                    "name": image_name
                }
                yield image_name, example