# coding=utf-8
# Copyright 2020 The TensorFlow Datasets Authors and the HuggingFace Datasets Authors.
#
# 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.

# Lint as: python3
"""Wikipedia dataset containing cleaned articles of all languages."""


import json
from tqdm import tqdm
import datasets
from pathlib import Path

logger = datasets.logging.get_logger(__name__)


_CITATION = """"""

_DESCRIPTION = """"""

_LICENSE = """"""


_VERSION = datasets.Version("2.0.0", "")
_NUM_SPLITS = 68


class WikipediaConfig(datasets.BuilderConfig):
    """BuilderConfig for Wikipedia."""

    def __init__(self, shard=None, version=_VERSION, **kwargs):
        """BuilderConfig for Wikipedia.

        Args:
          split: int, split number.
          **kwargs: keyword arguments forwarded to super.
        """
        super().__init__(
            name=f"shard_{shard}",
            description=f"Wikipedia dataset for split {shard}",
            version=version,
            **kwargs,
        )
        self.shard = shard


class Wikipedia(datasets.GeneratorBasedBuilder):
    """Wikipedia dataset."""

    # Use mirror (your.org) to avoid download caps.
    BUILDER_CONFIG_CLASS = WikipediaConfig
    BUILDER_CONFIG = [WikipediaConfig(shard=str(id)) for id in range(_NUM_SPLITS)]

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "identifier": datasets.Value("string"),
                    "name": datasets.Value("string"),
                    "namespace_name": datasets.Value("string"),
                    "namespace_identifier": datasets.Value("string"),
                    "categories": [
                        {
                            "name": datasets.Value("string"),
                            "url": datasets.Value("string"),
                        }
                    ],
                    "date_modified": datasets.Value("string"),
                    "url": datasets.Value("string"),
                    "html": datasets.Value("string"),
                    "wikitext": datasets.Value("string"),
                    "in_language": datasets.Value("string"),
                    "main_entity": {
                        "identifier": datasets.Value("string"),
                        "url": datasets.Value("string"),
                    },
                    "is_part_of": {
                        "name": datasets.Value("string"),
                        "identifier": datasets.Value("string"),
                    },
                    "license": [
                        {
                            "name": datasets.Value("string"),
                            "url": datasets.Value("string"),
                            "identifier": datasets.Value("string"),
                        }
                    ],
                }
            ),
            # No default supervised_keys.
            supervised_keys=None,
            homepage="https://dumps.wikimedia.org",
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        data_paths = [Path(self.config.data_dir) / f"enwiki_{self.config.shard}.ndjson"]
        return [
            datasets.SplitGenerator(  # pylint:disable=g-complex-comprehension
                name=datasets.Split.TRAIN, gen_kwargs={"filepaths": data_paths}
            )
        ]

    def _generate_examples(
        self,
        filepaths,
    ):
        for filepath in filepaths:
            with open(filepath, "r") as f:
                for line in tqdm(f):
                    example = json.loads(line)
                    clean_example = {}
                    clean_example["name"] = example["name"]
                    clean_example["identifier"] = example["identifier"]
                    clean_example["date_modified"] = example["date_modified"]
                    clean_example["namespace_name"] = example["namespace"]["name"]
                    clean_example["namespace_identifier"] = example["namespace"]["identifier"]
                    clean_example["categories"] = example.get("categories", None)
                    clean_example["url"] = example["url"]
                    clean_example["html"] = f'{example["article_body"]["html"]}'
                    clean_example["wikitext"] = example["article_body"]["wikitext"]
                    clean_example["in_language"] = example["in_language"]
                    clean_example["main_entity"] = example.get("main_entity", None)
                    clean_example["is_part_of"] = example["is_part_of"]
                    clean_example["license"] = example["license"]
                    yield clean_example["identifier"], clean_example