# coding=utf-8
# Copyright 2022 The PolyAI and 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.

import csv
import json
import os

import datasets

logger = datasets.logging.get_logger(__name__)


""" EVI Dataset"""

_CITATION = """\
@inproceedings{Spithourakis2022evi,
    author      = {Georgios P. Spithourakis and Ivan Vuli\'{c} and Micha\l{} Lis and I\~{n}igo Casanueva and Pawe\l{} Budzianowski},
    title       = {{EVI}: Multilingual Spoken Dialogue Tasks and Dataset for Knowledge-Based Enrolment, Verification, and Identification},
    year        = {2022},
    note        = {Data available at https://github.com/PolyAI-LDN/evi-paper},
    url         = {https://arxiv.org/abs/2204.13496},
    booktitle   = {Findings of NAACL (publication pending)}
}
"""  # noqa

_ALL_CONFIGS = sorted([
    "en-GB", "fr-FR", "pl-PL"
])

_DESCRIPTION = "EVI is a dataset for enrolment, identification, and verification"  # noqa

_HOMEPAGE_URL = "https://arxiv.org/abs/2204.13496"

_AUDIO_DATA_URL = "https://poly-public-data.s3.eu-west-2.amazonaws.com/evi-paper/audios.zip"  # noqa

_VERSION = datasets.Version("0.0.5", "")


class EviConfig(datasets.BuilderConfig):
    """BuilderConfig for EVI"""

    def __init__(
        self, name, version, description, homepage, audio_data_url
    ):
        super().__init__(
            name=self.name,
            version=version,
            description=self.description,
        )
        self.name = name
        self.description = description
        self.homepage = homepage
        self.audio_data_url = audio_data_url


def _build_config(name):
    return EviConfig(
        name=name,
        version=_VERSION,
        description=_DESCRIPTION,
        homepage=_HOMEPAGE_URL,
        audio_data_url=_AUDIO_DATA_URL,
    )


class Evi(datasets.GeneratorBasedBuilder):

    DEFAULT_WRITER_BATCH_SIZE = 1000
    BUILDER_CONFIGS = [
        _build_config(name) for name in _ALL_CONFIGS
    ]

    def _info(self):
        task_templates = None
        langs = _ALL_CONFIGS
        features = datasets.Features(
            {
                "lang_id": datasets.ClassLabel(names=langs),
                "dialogue_id": datasets.Value("string"),
                "speaker_id": datasets.Value("string"),
                "turn_id": datasets.Value("int32"),
                #
                "target_profile_id": datasets.Value("string"),
                #
                "asr_transcription": datasets.Value("string"),
                "asr_nbest": datasets.Sequence(datasets.Value("string")),
                #
                "path": datasets.Value("string"),
                "audio": datasets.Audio(sampling_rate=8_000),
            }
        )

        return datasets.DatasetInfo(
            version=self.config.version,
            description=self.config.description,
            homepage=self.config.homepage,
            license="CC-BY-4.0",
            citation=_CITATION,
            features=features,
            supervised_keys=None,
            task_templates=task_templates,
        )

    def _split_generators(self, dl_manager):
        langs = ([self.config.name])

        #audio_path = dl_manager.download_and_extract(
        #    self.config.audio_data_url
        #)
        audio_path = ""
        text_path = ""
        lang2text_path = {
            _lang: os.path.join(
                text_path,
                f"dialogues.{_lang.split('-')[0]}.csv"
            )
            for _lang in langs
        }
        lang2audio_path = {
            _lang: os.path.join(
                audio_path,
                f"{_lang.split('-')[0]}"
            )
            for _lang in langs
        }
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={
                    "audio_paths": lang2audio_path,
                    "text_paths": lang2text_path,
                },
            )
        ]

    def _generate_examples(self, audio_paths, text_paths):
        key = 0
        for lang in text_paths.keys():
            text_path = text_paths[lang]
            audio_path = audio_paths[lang]
            with open(text_path, encoding="utf-8") as fin:
                reader = csv.DictReader(
                    fin, delimiter=",", skipinitialspace=True
                )
                for dictrow in reader:
                    dialogue_id = dictrow["dialogue_id"]
                    turn_id = dictrow["turn_num"]
                    file_path = os.path.join(
                        audio_path,
                        dialogue_id,
                        f'{turn_id}.wav'
                    )
                    if not os.path.isfile(file_path):
                        file_path = None
                    example = {
                        "lang_id": _ALL_CONFIGS.index(lang),
                        "dialogue_id": dialogue_id,
                        "speaker_id": dictrow["speaker_id"],
                        "turn_id": turn_id,
                        "target_profile_id": dictrow["scenario_id"],
                        "asr_transcription": dictrow["transcription"],
                        "asr_nbest": json.loads(dictrow["nbest"]),
                        "path": file_path,
                        "audio": file_path,
                    }
                    print(example)
                    yield key, example
                    key += 1