# Copyright 2020 The HuggingFace Datasets Authors and the current dataset script contributor.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
""" VASR Loading Script """

import json
import os
import pandas as pd
import datasets
from huggingface_hub import hf_hub_url

# Find for instance the citation on arxiv or on the dataset repo/website
_CITATION = """
"""

_DESCRIPTION = """\
VASR is a challenging dataset for evaluating computer vision commonsense reasoning abilities. Given a triplet of images, the task is to select an image candidate B' that completes the analogy (A to A' is like B to what?). Unlike previous work on visual analogy that focused on simple image transformations, we tackle complex analogies requiring understanding of scenes. Our experiments demonstrate that state-of-the-art models struggle with carefully chosen distractors (±53%, compared to 90% human accuracy).
"""

_HOMEPAGE = "https://vasr-dataset.github.io/"

_LICENSE = "https://creativecommons.org/licenses/by/4.0/"

_URL = "https://huggingface.co/datasets/nlphuji/vasr/blob/main"

class Vasr(datasets.GeneratorBasedBuilder):
    VERSION = datasets.Version("1.1.0")

    # If you need to make complex sub-parts in the datasets with configurable options
    # You can create your own builder configuration class to store attribute, inheriting from datasets.BuilderConfig
    # BUILDER_CONFIG_CLASS = MyBuilderConfig

    BUILDER_CONFIGS = [
        datasets.BuilderConfig(name="v1", version=VERSION, description="vasr gold test dataset"),
    ]
    DATASET_KEYS = ["A", "A'", "B", "B'", 'candidates', 'label', "A_str", "A'_str", "B_str", "B'_str"]
    HIDDEN_LABEL = '? (hidden)'
    QMARK_IMG = 'qmark.png'

    def _info(self):
        features = datasets.Features(
            {
                "A": datasets.Image(),
                "A'": datasets.Image(),
                "B": datasets.Image(),
                "B'": datasets.Image(),
                "candidates_images": [datasets.Image()],
                "label": datasets.Value("int64"),
                "candidates": [datasets.Value("string")],
                "A_str": datasets.Value("string"),
                "A'_str": datasets.Value("string"),
                "B_str": datasets.Value("string"),
                "B'_str": datasets.Value("string"),
            }
        )
        return datasets.DatasetInfo(
            # This is the description that will appear on the datasets page.
            description=_DESCRIPTION,
            # This defines the different columns of the dataset and their types
            features=features,  # Here we define them above because they are different between the two configurations
            # If there's a common (input, target) tuple from the features, uncomment supervised_keys line below and
            # specify them. They'll be used if as_supervised=True in builder.as_dataset.
            # supervised_keys=("sentence", "label"),
            # Homepage of the dataset for documentation
            homepage=_HOMEPAGE,
            # License for the dataset if available
            license=_LICENSE,
            # Citation for the dataset
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        # If several configurations are possible (listed in BUILDER_CONFIGS), the configuration selected by the user is in self.config.name

        # dl_manager is a datasets.download.DownloadManager that can be used to download and extract URLS
        # It can accept any type or nested list/dict and will give back the same structure with the url replaced with path to local files.
        # By default the archives will be extracted and a path to a cached folder where they are extracted is returned instead of the archive
        data_dir = dl_manager.download_and_extract({
            "images_dir": hf_hub_url(repo_id="nlphuji/vasr", repo_type='dataset', filename="vasr_images.zip")
        })
        test_examples = hf_hub_url(repo_id="nlphuji/vasr", repo_type='dataset', filename="test_gold_unlabeled.csv")
        dev_examples = hf_hub_url(repo_id="nlphuji/vasr", repo_type='dataset', filename="dev_gold.csv")
        train_examples = hf_hub_url(repo_id="nlphuji/vasr", repo_type='dataset', filename="train_gold.csv")

        train_gen = datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={**data_dir, **{'examples_csv': train_examples}})
        dev_gen = datasets.SplitGenerator(name=datasets.Split.VALIDATION, gen_kwargs={**data_dir, **{'examples_csv': dev_examples}})
        test_gen = datasets.SplitGenerator(name=datasets.Split.TEST, gen_kwargs={**data_dir, **{'examples_csv': test_examples}})

        return [train_gen, dev_gen, test_gen]

    # method parameters are unpacked from `gen_kwargs` as given in `_split_generators`
    def _generate_examples(self, examples_csv, images_dir):
        # The `key` is for legacy reasons (tfds) and is not important in itself, but must be unique for each example.

        df = pd.read_csv(examples_csv)

        for r_idx, r in df.iterrows():
            r_dict = r.to_dict()
            r_dict['candidates'] = json.loads(r_dict['candidates'])
            candidates_images = [os.path.join(images_dir, "vasr_images", x) for x in
                                 r_dict['candidates']]
            r_dict['candidates_images'] = candidates_images
            r_dict["A_str"] = r_dict['A_img']
            r_dict["A'_str"] = r_dict['B_img']
            r_dict["B_str"] = r_dict['C_img']
            r_dict["B'_str"] = r_dict['D_img']
            for img in ['A_img', 'B_img', 'C_img', 'D_img']:
                if r_dict[img] == self.HIDDEN_LABEL:
                    r_dict[img] = os.path.join(images_dir, "vasr_images", self.QMARK_IMG)
                else:
                    r_dict[img] = os.path.join(images_dir, "vasr_images", r_dict[img])
            r_dict["A"] = r_dict['A_img']
            r_dict["A'"] = r_dict['B_img']
            r_dict["B"] = r_dict['C_img']
            r_dict["B'"] = r_dict['D_img']
            relevant_r_dict = {k:v for k,v in r_dict.items() if k in self.DATASET_KEYS or k == 'candidates_images'}
            yield r_idx, relevant_r_dict