# coding=utf-8
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# Lint as: python3
"""The ELEVATER benchmark"""

import json
import os

import datasets

from zipfile import ZipFile
from io import BytesIO
from PIL import Image

_ELEVATER_CITATION = """\
@article{li2022elevater,
    title={ELEVATER: A Benchmark and Toolkit for Evaluating Language-Augmented Visual Models},
    author={Li, Chunyuan and Liu, Haotian and Li, Liunian Harold and Zhang, Pengchuan and Aneja, Jyoti and Yang, Jianwei and Jin, Ping and Lee, Yong Jae and Hu, Houdong and Liu, Zicheng and Gao, Jianfeng},
    journal={Neural Information Processing Systems},
    year={2022}
}

Note that each ELEVATER dataset has its own citation. Please see the source to
get the correct citation for each contained dataset.
"""

_CIFAR_10_DESCRIPTION="""\
The CIFAR-10 dataset consists of 60000 32x32 colour images in 10 classes, with 6000 images per class. There are 50000 training images and 10000 test images."""

_CIFAR_10_CITATION="""\
@article{krizhevsky2009learning,
  title={Learning multiple layers of features from tiny images},
  author={Krizhevsky, Alex and Hinton, Geoffrey and others},
  year={2009},
  publisher={Toronto, ON, Canada}
}"""

class ELEVATERConfig(datasets.BuilderConfig):

    """BuilderConfig for ELEVATER."""
    print(f"zhlds/zhlds.py, line 50")
    def __init__(self, name, description, contact, version, type_, root_folder, labelmap, num_classes, train, test, citation, url, **kwargs):
        """BuilderConfig for ELEVATER.
        Args:
          features: `list[string]`, list of the features that will appear in the
            feature dict. Should not include "label".
          data_url: `string`, url to download the zip file from.
          citation: `string`, citation for the data set.
          url: `string`, url for information about the data set.
          label_classes: `list[string]`, the list of classes for the label if the
            label is present as a string. Non-string labels will be cast to either
            'False' or 'True'.
          **kwargs: keyword arguments forwarded to super.
        """
        super(ELEVATERConfig, self).__init__(**kwargs)
        self.name = name
        self.description = description
        self.contact = contact
        self.version = version
        self.type = type_
        self.root_folder = root_folder
        self.labelmap = labelmap
        self.num_classes = num_classes
        self.train = train
        self.test = test
        self.citation = citation
        self.url = url


class ELEVATER(datasets.GeneratorBasedBuilder):

    BUILDER_CONFIGS = [
        ELEVATERConfig(
            name="cifar-10",
            description="The CIFAR-10 dataset consists of 60000 32x32 colour images in 10 classes, with 6000 images per class. There are 50000 training images and 10000 test images.",
            contact="pinjin",
            version="1.0.0",
            type_="classification_multiclass",
            root_folder="classification/cifar_10_20211007",
            labelmap="labels.txt",
            num_classes=10,
            train={
                "index_path": "train.txt",
                "files_for_local_usage": ["train.zip"],
                "num_images": 50000
            },
            test={
                "index_path": "test.txt",
                "files_for_local_usage": ["val.zip"],
                "num_images": 10000
            },
            citation=_CIFAR_10_CITATION,
            url="https://cvinthewildeus.blob.core.windows.net/datasets/",
        ),
    ]

    def _info(self):
        features = datasets.Features(
            {
                "image_file_path": datasets.Value("string"),
                "image": datasets.Image(),
                "labels": datasets.Value("int32")
            }
        )
        return datasets.DatasetInfo(
            description=self.config.description,
            features=features,
            citation=self.config.citation + '\n' + _ELEVATER_CITATION,
        )

    def _split_generators(self, dl_manager):
        _URL = self.config.url + self.config.root_folder
        urls_to_download = {
            "labelmap": os.path.join(_URL, self.config.labelmap),
            "train": {
                "images": os.path.join(_URL, self.config.train['files_for_local_usage'][0]),
                "index": os.path.join(_URL, self.config.train['index_path']),
            },
            "test": {
                "images": os.path.join(_URL, self.config.test['files_for_local_usage'][0]),
                "index": os.path.join(_URL, self.config.test['index_path']),
            }
        } 
        downloaded_files = dl_manager.download_and_extract(urls_to_download)

        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "images": downloaded_files["train"]["images"],
                    "index": downloaded_files["train"]["index"],
                    "split": datasets.Split.TRAIN,
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={
                    "images": downloaded_files["test"]["images"],
                    "index": downloaded_files["test"]["index"],
                    "split": datasets.Split.TEST,
                },
            )
        ]

    def _generate_examples(self, images, index, split):
        image_path_label_list = []
        with open(index, "r") as f:
            lines = f.readlines()
            for i, line in enumerate(lines):
                line_split = line[:-1].split(" ")
                label = int(line_split[1])
                image_path = line_split[0].split('@')[1]
                path = images + '/' + image_path
                yield i, {
                    "image_file_path": path,
                    "image": path,
                    "labels": label,
                }