import json
import os
from pathlib import Path
from PIL import Image
import datasets
import logging

logger = datasets.logging.get_logger(__name__)
logger.setLevel("INFO")
stream_handler = logging.StreamHandler()
logger.addHandler(stream_handler)

"""
- o.a/o.a.f/0011656044-53.layout.json file has been deleted because it was empty

"""

def load_json(json_path):
    with open(json_path, "r") as f:
        data = json.load(f)
    return data


_CITATION = """
}
"""

_DESCRIPTION = """\
https://zenodo.org/record/6540454
"""


class CDIPAnnotationsConfig(datasets.BuilderConfig):
    """BuilderConfig for FUNSD"""

    def __init__(self, **kwargs):
        """BuilderConfig for FUNSD.
        Args:
          **kwargs: keyword arguments forwarded to super.
        """
        super(CDIPAnnotationsConfig, self).__init__(**kwargs)


class CDIPAnnotations(datasets.GeneratorBasedBuilder):
    """Conll2003 dataset."""

    BUILDER_CONFIGS = [
        CDIPAnnotationsConfig(
            name="cdip-annotations",
            version=datasets.Version("1.0.0"),
            description="CDIP Annotations",
        ),
    ]

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "id": datasets.Value("string"),
                    "words": datasets.Sequence(datasets.Value("string")),
                    "bboxes": datasets.Sequence(
                        datasets.Sequence(datasets.Value("int64"))
                    ),
                }
            ),
        )

    def _split_generators(self, dl_manager):
        """Returns SplitGenerators."""
        # downloaded_file = dl_manager.download_and_extract("https://guillaumejaume.github.io/FUNSD/dataset.zip")
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "annot_root": f"/home/jinho/datasets/IIT-CDIP-annotations"
                },
            ),
        ]

    def _generate_examples(self, annot_root):
        logger.info("⏳ Generating examples from = %s", annot_root)

        cnt = 0
        for subfolder in sorted(list(os.listdir(annot_root))):  # b.a, b.b
            subfolder_path = os.path.join(annot_root, subfolder)
            logger.info(f"{subfolder = }")

            for json_folder in os.listdir(subfolder_path):  # b.a.p, b.a.c
                json_folder_path = os.path.join(subfolder_path, json_folder)
                json_paths = list(Path(json_folder_path).glob("**/*.json"))
                logger.info(f"{json_folder, len(json_paths) = }")

                for idx, json_path in enumerate(json_paths):
                    words = []
                    bboxes = []
                    data = load_json(json_path)
                    for block in data["blocks"]:
                        for paragraph in block["paragraphs"]:
                            for line in paragraph["lines"]:
                                line_words = line["words"]
                                line_texts = [w["text"] for w in line_words]
                                line_bboxes = [w["box"] for w in line_words]
                                words.extend(line_texts)
                                bboxes.extend(line_bboxes)
                    cnt += 1

                    yield cnt, {
                        "id": str(json_path.name),
                        "words": words,
                        "bboxes": bboxes,
                    }