# coding=utf-8
# Copyright 2020 The HuggingFace Datasets Authors and the Semeru Lab and SEART research group.
#
# 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.
"""TODO: Add a description here."""


import csv
import glob
import os

import datasets

import numpy as np

# TODO: Add BibTeX citation
# Find for instance the citation on arxiv or on the dataset repo/website
_CITATION = """\
@InProceedings{huggingface:dataset,
    title = {A great new dataset},
    author={huggingface, Inc.
    },
    year={2020}
}
"""

# TODO: Add description of the dataset here
# You can copy an official description
_DESCRIPTION = """\
This new dataset is designed to solve this great NLP task and is crafted with a lot of care.
"""

# TODO: Add a link to an official homepage for the dataset here
_HOMEPAGE = ""

# TODO: Add the licence for the dataset here if you can find it
_LICENSE = ""

# TODO: Add link to the official dataset URLs here
# The HuggingFace dataset library don't host the datasets but only point to the original files
# This can be an arbitrary nested dict/list of URLs (see below in `_split_generators` method)
_DATA_URLs = {
    "long": {
        "train": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/long/training_long.csv",
        "valid": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/long/validation_long.csv",
        "test": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/long/test_long.csv",
    },
    "medium": {
        "train": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/medium/training_medium.csv",
        "valid": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/medium/validation_medium.csv",
        "test": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/medium/test_medium.csv",
    },
    "short": {
        "train": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/short/training_short.csv",
        "valid": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/short/validation_short.csv",
        "test": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/short/test_short.csv",
    },
    "mix": {
        "train": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/mix/training_mix.csv",
        "valid": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/mix/validation_mix.csv",
        "test": "https://huggingface.co/datasets/semeru/completeformer_java_data/resolve/main/mix/test_mix.csv",
    },
}


# TODO: Name of the dataset usually match the script name with CamelCase instead of snake_case
class CSNCHumanJudgementDataset(datasets.GeneratorBasedBuilder):
    """TODO: Short description of my dataset."""

    VERSION = datasets.Version("1.1.0")

    BUILDER_CONFIGS = [
        datasets.BuilderConfig(
            name="long",
            version=VERSION,
            description="",
        ),
        datasets.BuilderConfig(
            name="medium",
            version=VERSION,
            description="",
        ),
        datasets.BuilderConfig(
            name="short",
            version=VERSION,
            description="",
        ),
        datasets.BuilderConfig(
            name="mix",
            version=VERSION,
            description="",
        ),
    ]

    DEFAULT_CONFIG_NAME = "long"

    def _info(self):
        features = datasets.Features(
            { 
                "idx": datasets.Value("int32"),
                "input": datasets.Value("string"),
                "target": datasets.Value("string"),
            }
        )

        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            supervised_keys=None,
            homepage=_HOMEPAGE,
            license=_LICENSE,
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        """Returns SplitGenerators."""
        my_urls = _DATA_URLs[self.config.name]
        data_dirs = {}
        for k, v in my_urls.items():
            data_dirs[k] = dl_manager.download_and_extract(v)
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                # These kwargs will be passed to _generate_examples
                gen_kwargs={
                    "file_path": data_dirs["train"],
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                # These kwargs will be passed to _generate_examples
                gen_kwargs={
                    "file_path": data_dirs["valid"],
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                # These kwargs will be passed to _generate_examples
                gen_kwargs={
                    "file_path": data_dirs["test"],
                },
            ),
        ]

    def _generate_examples(
        self,
        file_path,
    ):
        """Yields examples as (key, example) tuples."""
        # This method handles input defined in _split_generators to yield (key, example) tuples from the dataset.
        # The `key` is here for legacy reason (tfds) and is not important in itself.

        with open(file_path, encoding="utf-8") as f:
            csv_reader = csv.reader(f, quotechar='"', delimiter=",", quoting=csv.QUOTE_ALL, skipinitialspace=True)
            next(csv_reader, None) # skip header

            for row_id, row in enumerate(csv_reader):
                _, idx, input, target = row
                yield row_id, {
                    "idx": idx,
                    "input": input,
                    "target": target,
                }