# 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.
"""A dictionary of events in Wikidata"""


import json

import datasets

_CITATION = """\
@article{pratapa-etal-2022-multilingual,
title = {Multilingual Event Linking to Wikidata},
author = {Pratapa, Adithya and Gupta, Rishubh and Mitamura, Teruko},
publisher = {arXiv},
year = {2022},
url = {https://arxiv.org/abs/2204.06535},
}
"""

_DESCRIPTION = """\
XLEL-WD is a multilingual event linking dataset. \
This sub-dataset contains a dictionary of events from Wikidata. \
The multilingual descriptions for Wikidata event items are taken from the corresponding Wikipedia articles.
"""

_HOMEPAGE = "https://github.com/adithya7/xlel-wd"

_LICENSE = "CC-BY-4.0"

_URLS = {
    "wikidata": "label_dict.jsonl",
}

_WIKIDATA_LANGS = [
    "af",
    "ar",
    "be",
    "bg",
    "bn",
    "ca",
    "cs",
    "da",
    "de",
    "el",
    "en",
    "es",
    "fa",
    "fi",
    "fr",
    "he",
    "hi",
    "hu",
    "id",
    "it",
    "ja",
    "ko",
    "ml",
    "mr",
    "ms",
    "nl",
    "no",
    "pl",
    "pt",
    "ro",
    "ru",
    "si",
    "sk",
    "sl",
    "sr",
    "sv",
    "sw",
    "ta",
    "te",
    "th",
    "tr",
    "uk",
    "vi",
    "zh",
]

_DATASET_NAMES = [f"wikidata"]
_DATASET_DESCRIPTIONS = [
    f"Events from Wikidata, with text descriptions from corresponding multilingual Wikipedia."
]

for lang in _WIKIDATA_LANGS:
    _DATASET_NAMES += [f"wikidata.{lang}"]
    _DATASET_DESCRIPTIONS += [
        f"Events from Wikidata, with text descriptions from corresponding {lang}-wikipedia."
    ]


class XlelWdDictionary(datasets.GeneratorBasedBuilder):
    """A dictionary of events from Wikidata, with text descriptions from multilingual Wikipedia."""

    BUILDER_CONFIGS = [
        datasets.BuilderConfig(
            name=name, version=datasets.Version("1.0.0"), description=desc
        )
        for name, desc in zip(_DATASET_NAMES, _DATASET_DESCRIPTIONS)
    ]

    # default config includes all available languages
    DEFAULT_CONFIG_NAME = "wikidata"

    def _info(self):

        features = {
            "label_id": datasets.Value("string"),
            "label_title": datasets.Value("string"),
            "label_desc": datasets.Value("string"),
            "label_lang": datasets.Value("string"),
        }
        return datasets.DatasetInfo(
            description=_DESCRIPTION + self.config.description,
            features=datasets.Features(features),
            homepage=_HOMEPAGE,
            license=_LICENSE,
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):

        urls = _URLS[self.config.name.split(".")[0]]
        data_file_path = dl_manager.download_and_extract(urls)
        return [
            datasets.SplitGenerator(
                name="dictionary",
                gen_kwargs={"filepath": data_file_path},
            )
        ]

    def _generate_examples(self, filepath):

        _, *langs = self.config.name.split(".")
        with open(filepath, encoding="utf-8") as f:
            for key, row in enumerate(f):
                data = json.loads(row)
                # generate list of Wikidata events with descriptions from specified language
                # if no language is specified in the config, return all
                if len(langs) == 0 or langs[0] == data["label_lang"]:
                    yield key, data