# coding=utf-8
# Copyright 2022 The HuggingFace Datasets Authors and Arjun Barrett.
#
# 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.
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# limitations under the License.

# Lint as: python3
"""VoxCeleb audio-visual human speech dataset."""

import json
import os
from getpass import getpass
from hashlib import sha256
from itertools import repeat
from multiprocessing import Manager, Pool, Process
from pathlib import Path
from queue import Queue
from shutil import copyfileobj
from typing import Optional, cast

import pandas as pd
import requests

import datasets

_CITATION = """\
@Article{Nagrani19,
    author = "Arsha Nagrani and Joon~Son Chung and Weidi Xie and Andrew Zisserman",
    title = "Voxceleb: Large-scale speaker verification in the wild",
    journal = "Computer Science and Language",
    year = "2019",
    publisher = "Elsevier",
}

@InProceedings{Chung18b,
    author = "Chung, J.~S. and Nagrani, A. and Zisserman, A.",
    title = "VoxCeleb2: Deep Speaker Recognition",
    booktitle = "INTERSPEECH",
    year = "2018",
}

@InProceedings{Nagrani17,
    author = "Nagrani, A. and Chung, J.~S. and Zisserman, A.",
    title = "VoxCeleb: a large-scale speaker identification dataset",
    booktitle = "INTERSPEECH",
    year = "2017",
}
"""

_DESCRIPTION = """\
VoxCeleb is an audio-visual dataset consisting of short clips of human speech, extracted from interview videos uploaded to YouTube
"""

_URL = "https://mm.kaist.ac.kr/datasets/voxceleb"

_URLS = {
    "video": {
        "placeholder": "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_parta",
        "dev": (
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partaa",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partab",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partac",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partad",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partae",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partaf",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partag",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partah",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_mp4_partai",
        ),
        "test": "http://143.248.230.30/voxceleb/vox1a/vox2_test_mp4.zip",
    },
    "audio1": {
        "placeholder": "http://143.248.230.30/voxceleb/vox1a/vox1_dev_wav_parta",
        "dev": (
            "http://143.248.230.30/voxceleb/vox1a/vox1_dev_wav_partaa",
            "http://143.248.230.30/voxceleb/vox1a/vox1_dev_wav_partab",
            "http://143.248.230.30/voxceleb/vox1a/vox1_dev_wav_partac",
            "http://143.248.230.30/voxceleb/vox1a/vox1_dev_wav_partad",
        ),
        "test": "http://143.248.230.30/voxceleb/vox1a/vox1_test_wav.zip",
    },
    "audio2": {
        "placeholder": "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_parta",
        "dev": (
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partaa",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partab",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partac",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partad",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partae",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partaf",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partag",
            "http://143.248.230.30/voxceleb/vox1a/vox2_dev_aac_partah",
        ),
        "test": "http://143.248.230.30/voxceleb/vox1a/vox2_test_aac.zip",
    },
}

_DATASET_IDS = {"video": "vox2", "audio1": "vox1", "audio2": "vox2"}

_PLACEHOLDER_MAPS = dict(
    value
    for urls in _URLS.values()
    for value in ((urls["placeholder"], urls["dev"]), (urls["test"], (urls["test"],)))
)


def _mp_download(
    url: str,
    tmp_path: Path,
    cred_user: str,
    cred_pass: str,
    resume_pos: int,
    length: int,
    queue: Queue,
):
    if length == resume_pos:
        return
    with open(tmp_path, "ab" if resume_pos else "wb") as tmp:
        headers: dict[str, str] = {}
        if resume_pos != 0:
            headers["Range"] = f"bytes={resume_pos}-"
        response = requests.get(
            url, auth=(cred_user, cred_pass), headers=headers, stream=True
        )
        if response.status_code >= 200 and response.status_code < 300:
            for chunk in response.iter_content(chunk_size=65536):
                queue.put(len(chunk))
                tmp.write(chunk)
        else:
            raise ConnectionError("failed to fetch dataset")


class VoxCeleb(datasets.GeneratorBasedBuilder):
    """VoxCeleb is an unlabled dataset consisting of short clips of human speech from interviews on YouTube"""

    VERSION = datasets.Version("1.0.0")

    BUILDER_CONFIGS = [
        datasets.BuilderConfig(
            name="video", version=VERSION, description="Video clips of human speech"
        ),
        datasets.BuilderConfig(
            name="audio", version=VERSION, description="Audio clips of human speech"
        ),
        datasets.BuilderConfig(
            name="audio1",
            version=datasets.Version("1.0.0"),
            description="Audio clips of human speech from VoxCeleb1",
        ),
        datasets.BuilderConfig(
            name="audio2",
            version=datasets.Version("2.0.0"),
            description="Audio clips of human speech from VoxCeleb2",
        ),
    ]

    def _info(self):
        features = cast(
            dict,
            {
                "file": datasets.Value("string"),
                "file_format": datasets.Value("string"),
                "dataset_id": datasets.Value("string"),
                "speaker_id": datasets.Value("string"),
                "speaker_gender": datasets.Value("string"),
                "video_id": datasets.Value("string"),
                "clip_index": datasets.Value("int32"),
            },
        )
        if self.config.name == "audio1":
            features["speaker_name"] = datasets.Value("string")
            features["speaker_nationality"] = datasets.Value("string")
        if self.config.name.startswith("audio"):
            features["audio"] = datasets.Audio(sampling_rate=16000)

        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            homepage=_URL,
            supervised_keys=datasets.info.SupervisedKeysData("file", "speaker_id"),
            features=datasets.Features(features),
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        if dl_manager.is_streaming:
            raise TypeError("Streaming is not supported for VoxCeleb")
        targets = (
            ["audio1", "audio2"] if self.config.name == "audio" else [self.config.name]
        )
        cred_user: Optional[str] = os.environ.get("HUGGING_FACE_VOX_CELEB_USER")
        cred_pass: Optional[str] = os.environ.get("HUGGING_FACE_VOX_CELEB_PASS")
        creds_path = Path(
            f"~/.huggingface/voxceleb_{self.VERSION}_credentials"
        ).expanduser()

        if cred_user is None and cred_pass is None:
            if creds_path.exists():
                with open(creds_path, "r") as creds:
                    cred_user, cred_pass = json.load(creds)
            else:
                print(
                    "You need a temporary username and password to access VoxCeleb.",
                    f"Go to the project homepage ({_URL}) and fill out the form to request credentials.",
                )
                cred_user = input("VoxCeleb username: ")
                cred_pass = getpass("VoxCeleb password: ")

        if not cred_user or not cred_pass:
            raise ValueError("could not find username and password to log in")

        saved_credentials = False

        def save_credentials():
            nonlocal saved_credentials, cred_user, cred_pass, creds_path
            if not saved_credentials:
                creds_path.parent.mkdir(exist_ok=True)
                with open(creds_path, "w") as creds:
                    json.dump((cred_user, cred_pass), creds)
                saved_credentials = True

        def download_custom(placeholder_url: str, path: str):
            nonlocal dl_manager, cred_user, cred_pass
            sources = _PLACEHOLDER_MAPS[placeholder_url]
            tmp_paths: list[Path] = []
            lengths: list[int] = []
            start_positions: list[int] = []
            for url in sources:
                head = requests.head(url, auth=(cred_user, cred_pass))
                if head.status_code == 401:
                    raise ValueError("failed to authenticate with VoxCeleb host")
                if head.status_code < 200 or head.status_code >= 300:
                    raise ValueError("failed to fetch dataset")
                save_credentials()
                content_length = head.headers.get("Content-Length")
                if content_length is None:
                    raise ValueError("expected non-empty Content-Length")
                content_length = int(content_length)
                tmp_path = Path(path + "." + sha256(url.encode("utf-8")).hexdigest())
                tmp_paths.append(tmp_path)
                lengths.append(content_length)
                start_positions.append(
                    tmp_path.stat().st_size
                    if tmp_path.exists() and dl_manager.download_config.resume_download
                    else 0
                )

            def progress(q: Queue[int], cur: int, total: int):
                with datasets.utils.logging.tqdm(
                    unit="B",
                    unit_scale=True,
                    total=total,
                    initial=cur,
                    desc="Downloading",
                    disable=not datasets.utils.logging.is_progress_bar_enabled(),
                ) as progress:
                    while cur < total:
                        try:
                            added = q.get(timeout=1)
                            progress.update(added)
                            cur += added
                        except:
                            continue

            manager = Manager()
            q = manager.Queue()
            with Pool(len(sources)) as pool:
                proc = Process(
                    target=progress,
                    args=(q, sum(start_positions), sum(lengths)),
                    daemon=True,
                )
                proc.start()
                pool.starmap(
                    _mp_download,
                    zip(
                        sources,
                        tmp_paths,
                        repeat(cred_user),
                        repeat(cred_pass),
                        start_positions,
                        lengths,
                        repeat(q),
                    ),
                )
                pool.close()
                proc.join()
            with open(path, "wb") as out:
                for tmp_path in tmp_paths:
                    with open(tmp_path, "rb") as tmp:
                        copyfileobj(tmp, out)
                    tmp_path.unlink()

        metadata = dl_manager.download(
            dict(
                (
                    target,
                    f"https://mm.kaist.ac.kr/datasets/voxceleb/meta/{_DATASET_IDS[target]}_meta.csv",
                )
                for target in targets
            )
        )

        mapped_paths = cast(
            dict[str, dict[str, str]],
            dl_manager.extract(
                dl_manager.download_custom(
                    dict(
                        (
                            placeholder_key,
                            dict(
                                (target, _URLS[target][placeholder_key])
                                for target in targets
                            ),
                        )
                        for placeholder_key in ("placeholder", "test")
                    ),
                    download_custom,
                )
            ),
        )

        return [
            datasets.SplitGenerator(
                name="train",
                gen_kwargs={
                    "paths": mapped_paths["placeholder"],
                    "meta_paths": metadata,
                },
            ),
            datasets.SplitGenerator(
                name="test",
                gen_kwargs={
                    "paths": mapped_paths["test"],
                    "meta_paths": metadata,
                },
            ),
        ]

    def _generate_examples(self, paths: dict[str, str], meta_paths: dict[str, str]):
        key = 0
        for conf in paths:
            dataset_id = "vox1" if conf == "audio1" else "vox2"
            meta = pd.read_csv(
                meta_paths[conf],
                sep="\t" if conf == "audio1" else " ,",
                index_col=0,
                engine="python",
            )
            dataset_path = next(Path(paths[conf]).iterdir())
            dataset_format = dataset_path.name
            for speaker_path in dataset_path.iterdir():
                speaker = speaker_path.name
                speaker_info = meta.loc[speaker]
                for video in speaker_path.iterdir():
                    video_id = video.name
                    for clip in video.iterdir():
                        clip_index = int(clip.stem)
                        info = {
                            "file": str(clip),
                            "file_format": dataset_format,
                            "dataset_id": dataset_id,
                            "speaker_id": speaker,
                            "speaker_gender": speaker_info["Gender"],
                            "video_id": video_id,
                            "clip_index": clip_index,
                        }
                        if dataset_id == "vox1":
                            info["speaker_name"] = speaker_info["VGGFace1 ID"]
                            info["speaker_nationality"] = speaker_info["Nationality"]
                        if conf.startswith("audio"):
                            info["audio"] = info["file"]
                        yield key, info
                        key += 1