streamrip/streamrip/bases.py

"""These are the lower level classes that are handled by Album, Playlist,
and the other objects. They can also be downloaded individually, for example,
as a single track.
"""

import concurrent.futures
import logging
import os
import re
import shutil
import subprocess
from tempfile import gettempdir
from typing import Any, Union

import click
import tqdm
from mutagen.flac import FLAC, Picture
from mutagen.id3 import APIC, ID3, ID3NoHeaderError
from mutagen.mp4 import MP4, MP4Cover
from pathvalidate import sanitize_filepath

from . import converter
from .clients import Client
from .constants import FLAC_MAX_BLOCKSIZE, TRACK_FORMAT
from .exceptions import (
    InvalidQuality,
    InvalidSourceError,
    NonStreamable,
    TooLargeCoverArt,
)
from .metadata import TrackMetadata
from .utils import (
    clean_format,
    decho,
    decrypt_mqa_file,
    ext,
    safe_get,
    tidal_cover_url,
    tqdm_download,
)

logger = logging.getLogger(__name__)

TYPE_REGEXES = {
    "remaster": re.compile(r"(?i)(re)?master(ed)?"),
    "extra": re.compile(r"(?i)(anniversary|deluxe|live|collector|demo|expanded)"),
}


class Track:
    """Represents a downloadable track.

    Loading metadata as a single track:
    >>> t = Track(client, id='20252078')
    >>> t.load_meta()  # load metadata from api

    Loading metadata as part of an Album:
    >>> t = Track.from_album_meta(api_track_dict, client)

    where `api_track_dict` is a track entry in an album tracklist.

    Downloading and tagging:
    >>> t.download()
    >>> t.tag()
    """

    def __init__(self, client: Client, **kwargs):
        """Create a track object.

        The only required parameter is client, but passing at an id is
        highly recommended. Every value in kwargs will be set as an attribute
        of the object. (TODO: make this safer)

        :param track_id: track id returned by Qobuz API
        :type track_id: Optional[Union[str, int]]
        :param client: qopy client
        :type client: Client
        :param meta: TrackMetadata object
        :type meta: Optional[TrackMetadata]
        :param kwargs: id, filepath_format, meta, quality, folder
        """
        self.client = client
        self.id = None
        self.__dict__.update(kwargs)

        self.downloaded = False
        self.tagged = False
        self.converted = False
        # TODO: find better solution
        for attr in ("quality", "folder", "meta"):
            setattr(self, attr, None)

        if isinstance(kwargs.get("meta"), TrackMetadata):
            self.meta = kwargs["meta"]

        if (u := kwargs.get("cover_url")) is not None:
            logger.debug(f"Cover url: {u}")
            self.cover_url = u

    def load_meta(self):
        """Send a request to the client to get metadata for this Track."""

        assert self.id is not None, "id must be set before loading metadata"

        self.resp = self.client.get(self.id, media_type="track")
        self.meta = TrackMetadata(
            track=self.resp, source=self.client.source
        )  # meta dict -> TrackMetadata object
        try:
            if self.client.source == "qobuz":
                self.cover_url = self.resp["album"]["image"]["large"]
            elif self.client.source == "tidal":
                self.cover_url = tidal_cover_url(self.resp["album"]["cover"], 320)
            elif self.client.source == "deezer":
                self.cover_url = self.resp["album"]["cover_medium"]
            elif self.client.source == "soundcloud":
                self.cover_url = (
                    self.resp["artwork_url"] or self.resp["user"].get("avatar_url")
                ).replace("large", "t500x500")
            else:
                raise InvalidSourceError(self.client.source)
        except KeyError:
            logger.debug("No cover found")
            self.cover_url = None

    def _prepare_download(self, **kwargs):
        """This function does preprocessing to prepare for downloading tracks.
        It creates the directories, downloads cover art, and (optionally)
        downloads booklets.

        :param kwargs:
        """
        # args override attributes
        self.quality = min(kwargs["quality"], self.client.max_quality)
        self.folder = kwargs["parent_folder"] or self.folder

        self.file_format = kwargs.get("track_format", TRACK_FORMAT)
        self.folder = sanitize_filepath(self.folder, platform="auto")
        self.format_final_path()

        os.makedirs(self.folder, exist_ok=True)

        if self.id in kwargs.get("database", []):
            self.downloaded = True
            self.tagged = True
            self.path = self.final_path
            decho(
                f"{self['title']} already logged in database, skipping.",
                fg="magenta",
            )
            return False  # because the track was not downloaded

        if os.path.isfile(self.final_path):  # track already exists
            self.downloaded = True
            self.tagged = True
            self.path = self.final_path
            decho(f"Track already exists: {self.final_path}", fg="magenta")
            return False

        self.download_cover()  # only downloads for playlists and singles
        self.path = os.path.join(gettempdir(), f"{hash(self.id)}_{self.quality}.tmp")
        return True

    def download(
        self,
        quality: int = 3,
        parent_folder: str = "StreamripDownloads",
        progress_bar: bool = True,
        **kwargs,
    ) -> bool:
        """Download the track.

        :param quality: (0, 1, 2, 3, 4)
        :type quality: int
        :param folder: folder to download the files to
        :type folder: Optional[Union[str, os.PathLike]]
        :param progress_bar: turn on/off progress bar
        :type progress_bar: bool
        """
        if not self._prepare_download(
            quality=quality,
            parent_folder=parent_folder,
            progress_bar=progress_bar,
            **kwargs,
        ):
            return False

        if self.client.source == "soundcloud":
            # soundcloud client needs whole dict to get file url
            url_id = self.resp
        else:
            url_id = self.id

        try:
            dl_info = self.client.get_file_url(url_id, self.quality)
        except Exception as e:
            click.secho(f"Unable to download track. {e}", fg="red")
            return False

        if self.client.source == "qobuz":
            if not self.__validate_qobuz_dl_info(dl_info):
                click.secho("Track is not available for download", fg="red")
                return False

            self.sampling_rate = dl_info.get("sampling_rate")
            self.bit_depth = dl_info.get("bit_depth")

        # --------- Download Track ----------
        if self.client.source in ("qobuz", "tidal", "deezer"):
            logger.debug("Downloadable URL found: %s", dl_info.get("url"))
            try:
                tqdm_download(
                    dl_info["url"], self.path, desc=self._progress_desc
                )  # downloads file
            except NonStreamable:
                click.secho(
                    "Track {self!s} is not available for download, skipping.", fg="red"
                )
                return False

        elif self.client.source == "soundcloud":
            self._soundcloud_download(dl_info)

        else:
            raise InvalidSourceError(self.client.source)

        if (
            self.client.source == "tidal"
            and isinstance(dl_info, dict)
            and dl_info.get("enc_key", False)
        ):
            out_path = f"{self.path}_dec"
            decrypt_mqa_file(self.path, out_path, dl_info["enc_key"])
            self.path = out_path

        if not kwargs.get("stay_temp", False):
            self.move(self.final_path)

        try:
            database = kwargs.get("database")
            database.add(self.id)
            logger.debug(f"{self.id} added to database")
        except AttributeError:  # assume database=None was passed
            pass

        logger.debug("Downloaded: %s -> %s", self.path, self.final_path)

        self.downloaded = True

        if not kwargs.get("keep_cover", True) and hasattr(self, "cover_path"):
            os.remove(self.cover_path)

        return True

    def __validate_qobuz_dl_info(self, info: dict) -> bool:
        """Check if the download info dict returned by Qobuz is downloadable.

        :param info:
        :type info: dict
        :rtype: bool
        """
        return all(
            (info.get("sampling_rate"), info.get("bit_depth"), not info.get("sample"))
        )

    def move(self, path: str):
        """Moves the Track and sets self.path to the new path.

        :param path:
        :type path: str
        """
        os.makedirs(os.path.dirname(path), exist_ok=True)
        shutil.move(self.path, path)
        self.path = path

    def _soundcloud_download(self, dl_info: dict) -> str:
        """Downloads a soundcloud track. This requires a seperate function
        because there are three methods that can be used to download a track:
            * original file downloads
            * direct mp3 downloads
            * hls stream ripping
        All three of these need special processing.

        :param dl_info:
        :type dl_info: dict
        :rtype: str
        """
        if dl_info["type"] == "mp3":
            self.path += ".mp3"
            # convert hls stream to mp3
            subprocess.call(
                [
                    "ffmpeg",
                    "-i",
                    dl_info["url"],
                    "-c",
                    "copy",
                    "-y",
                    self.path,
                    "-loglevel",
                    "fatal",
                ]
            )
        elif dl_info["type"] == "original":
            tqdm_download(dl_info["url"], self.path, desc=self._progress_desc)

            # if a wav is returned, convert to flac
            engine = converter.FLAC(self.path)
            self.path = f"{self.path}.flac"
            engine.convert(custom_fn=self.path)

            self.final_path = self.final_path.replace(".mp3", ".flac")
            self.quality = 2

    @property
    def _progress_desc(self) -> str:
        """The description that is used on the progress bar.

        :rtype: str
        """
        return click.style(f"Track {int(self.meta.tracknumber):02}", fg="blue")

    def download_cover(self):
        """Downloads the cover art, if cover_url is given."""

        if not hasattr(self, "cover_url"):
            return False

        self.cover_path = os.path.join(gettempdir(), f"cover{hash(self.cover_url)}.jpg")
        logger.debug(f"Downloading cover from {self.cover_url}")
        # click.secho(f"\nDownloading cover art for {self!s}", fg="blue")

        if not os.path.exists(self.cover_path):
            tqdm_download(
                self.cover_url, self.cover_path, desc=click.style("Cover", fg="cyan")
            )
        else:
            logger.debug("Cover already exists, skipping download")

    def format_final_path(self) -> str:
        """Return the final filepath of the downloaded file.

        This uses the `get_formatter` method of TrackMetadata, which returns
        a dict with the keys allowed in formatter strings, and their values in
        the TrackMetadata object.
        """
        formatter = self.meta.get_formatter()
        logger.debug("Track meta formatter %s", formatter)
        filename = clean_format(self.file_format, formatter)
        self.final_path = os.path.join(self.folder, filename)[:250].strip() + ext(
            self.quality, self.client.source
        )

        logger.debug("Formatted path: %s", self.final_path)

        return self.final_path

    @classmethod
    def from_album_meta(cls, album: TrackMetadata, track: dict, client: Client):
        """Return a new Track object initialized with info from the album dicts
        returned by client.get calls.

        :param album: album metadata returned by API
        :param pos: index of the track
        :param client: qopy client object
        :type client: Client
        :raises IndexError
        """

        meta = TrackMetadata(album=album, track=track, source=client.source)
        return cls(client=client, meta=meta, id=track["id"])

    @classmethod
    def from_api(cls, item: dict, client: Client):
        """Given a track dict from an API, return a new Track object
        initialized with the proper values.

        :param item:
        :type item: dict
        :param client:
        :type client: Client
        """
        meta = TrackMetadata(track=item, source=client.source)
        try:
            if client.source == "qobuz":
                cover_url = item["album"]["image"]["large"]
            elif client.source == "tidal":
                cover_url = tidal_cover_url(item["album"]["cover"], 640)
            elif client.source == "deezer":
                cover_url = item["album"]["cover_large"]
            else:
                raise InvalidSourceError(client.source)
        except KeyError:
            logger.debug("No cover found")
            cover_url = None

        return cls(
            client=client,
            meta=meta,
            id=item["id"],
            cover_url=cover_url,
        )

    def tag(
        self,
        album_meta: dict = None,
        cover: Union[Picture, APIC, MP4Cover] = None,
        embed_cover: bool = True,
    ):
        """Tag the track using the stored metadata.

        The info stored in the TrackMetadata object (self.meta) can be updated
        with album metadata if necessary. The cover must be a mutagen cover-type
        object that already has the bytes loaded.

        :param album_meta: album metadata to update Track with
        :type album_meta: dict
        :param cover: initialized mutagen cover object
        :type cover: Union[Picture, APIC]
        :param embed_cover: Embed cover art into file
        :type embed_cover: bool
        """
        assert isinstance(self.meta, TrackMetadata), "meta must be TrackMetadata"
        if not self.downloaded:
            logger.info(
                "Track %s not tagged because it was not downloaded", self["title"]
            )
            return

        if self.tagged:
            logger.info(
                "Track %s not tagged because it is already tagged", self["title"]
            )
            return

        if album_meta is not None:
            self.meta.add_album_meta(album_meta)  # extend meta with album info

        # TODO: make this cleaner
        if self.converted:
            if self.container == "FLAC":
                audio = FLAC(self.path)
            elif self.container in ("AAC", "ALAC", "MP4"):
                audio = MP4(self.path)
            elif self.container == "MP3":
                audio = ID3()
                try:
                    audio = ID3(self.path)
                except ID3NoHeaderError:
                    audio = ID3()
        else:
            if self.quality in (2, 3, 4):
                self.container = "FLAC"
                logger.debug("Tagging file with %s container", self.container)
                audio = FLAC(self.path)
            elif self.quality <= 1:
                if self.client.source == "tidal":
                    self.container = "AAC"
                    audio = MP4(self.path)
                else:
                    self.container = "MP3"
                    try:
                        audio = ID3(self.path)
                    except ID3NoHeaderError:
                        audio = ID3()

                logger.debug("Tagging file with %s container", self.container)
            else:
                raise InvalidQuality(f'Invalid quality: "{self.quality}"')

        # automatically generate key, value pairs based on container
        tags = self.meta.tags(self.container)
        for k, v in tags:
            audio[k] = v

        if embed_cover and cover is None:
            assert hasattr(self, "cover_path")
            cover = Tracklist.get_cover_obj(
                self.cover_path, self.container, self.client.source
            )

        if isinstance(audio, FLAC):
            if embed_cover:
                audio.add_picture(cover)
            audio.save()
        elif isinstance(audio, ID3):
            if embed_cover:
                audio.add(cover)
            audio.save(self.path, "v2_version=3")
        elif isinstance(audio, MP4):
            audio["covr"] = [cover]
            audio.save()
        else:
            raise ValueError(f"Unknown container type: {audio}")

        self.tagged = True

    def convert(self, codec: str = "ALAC", **kwargs):
        """Converts the track to another codec.

        Valid values for codec:
            * FLAC
            * ALAC
            * MP3
            * OPUS
            * OGG
            * VORBIS
            * AAC
            * M4A

        :param codec: the codec to convert the track to
        :type codec: str
        :param kwargs:
        """
        if not self.downloaded:
            logger.debug("Track not downloaded, skipping conversion")
            click.secho("Track not downloaded, skipping conversion", fg="magenta")
            return

        CONV_CLASS = {
            "FLAC": converter.FLAC,
            "ALAC": converter.ALAC,
            "MP3": converter.LAME,
            "OPUS": converter.OPUS,
            "OGG": converter.Vorbis,
            "VORBIS": converter.Vorbis,
            "AAC": converter.AAC,
            "M4A": converter.AAC,
        }

        self.container = codec.upper()
        if not hasattr(self, "final_path"):
            self.format_final_path()

        if not os.path.isfile(self.path):
            logger.info("File %s does not exist. Skipping conversion.", self.path)
            click.secho(f"{self!s} does not exist. Skipping conversion.", fg="red")
            return

        assert (
            self.container in CONV_CLASS
        ), f"Invalid codec {codec}. Must be in {CONV_CLASS.keys()}"

        engine = CONV_CLASS[self.container](
            filename=self.path,
            sampling_rate=kwargs.get("sampling_rate"),
            remove_source=kwargs.get("remove_source", True),
        )
        # click.secho(f"Converting {self!s}", fg="blue")
        engine.convert()
        self.path = engine.final_fn
        self.final_path = self.final_path.replace(
            ext(self.quality, self.client.source), f".{engine.container}"
        )

        if not kwargs.get("stay_temp", False):
            self.move(self.final_path)

        self.converted = True

    @property
    def title(self) -> str:
        """The title of the track.

        :rtype: str
        """
        if hasattr(self, "meta"):
            _title = self.meta.title
            if self.meta.explicit:
                _title = f"{_title} (Explicit)"
            return _title
        else:
            raise Exception("Track must be loaded before accessing title")

    def get(self, *keys, default=None) -> Any:
        """Safe get method that allows for layered access.

        :param keys:
        :param default:
        """
        return safe_get(self.meta, *keys, default=default)

    def set(self, key, val):
        """Equivalent to __setitem__. Implemented only for
        consistency.

        :param key:
        :param val:
        """
        self.__setitem__(key, val)

    def __getitem__(self, key: str) -> Any:
        """Dict-like interface for Track metadata.

        :param key:
        """
        return getattr(self.meta, key)

    def __setitem__(self, key: str, val: Any):
        """Dict-like interface for Track metadata.

        :param key:
        :param val:
        """
        setattr(self.meta, key, val)

    def __repr__(self) -> str:
        """Return a string representation of the track.

        :rtype: str
        """
        return f"<Track - {self['title']}>"

    def __str__(self) -> str:
        """Return a readable string representation of
        this track.

        :rtype: str
        """
        return f"{self['artist']} - {self['title']}"


class Video:
    """Only for Tidal."""

    def __init__(self, client: Client, id: str, **kwargs):
        self.id = id
        self.client = client
        self.title = kwargs.get("title", "MusicVideo")
        self.explicit = kwargs.get("explicit", False)
        self.tracknumber = kwargs.get("tracknumber", None)

    def load_meta(self):
        """Given an id at contruction, get the metadata of the video."""
        resp = self.client.get(self.id, "video")
        self.title = resp["title"]
        self.explicit = resp["explicit"]

    def download(self, **kwargs):
        """Download the Video.

        :param kwargs:
        """
        click.secho(
            f"Downloading {self.title} (Video). This may take a while.", fg="blue"
        )

        self.parent_folder = kwargs.get("parent_folder", "StreamripDownloads")
        url = self.client.get_file_url(self.id, video=True)
        # it's more convenient to have ffmpeg download the hls
        command = ["ffmpeg", "-i", url, "-c", "copy", "-loglevel", "panic", self.path]
        p = subprocess.Popen(command)
        p.wait()  # remove this?

        return False  # so that it is not tagged

    @classmethod
    def from_album_meta(cls, track: dict, client: Client):
        """Given an video response dict from an album, return a new
        Video object from the information.

        :param track:
        :type track: dict
        :param client:
        :type client: Client
        """
        return cls(
            client,
            id=track["id"],
            title=track["title"],
            explicit=track["explicit"],
            tracknumber=track["trackNumber"],
        )

    @property
    def path(self) -> str:
        """The path to download the mp4 file.

        :rtype: str
        """
        os.makedirs(self.parent_folder, exist_ok=True)
        fname = self.title
        if self.explicit:
            fname = f"{fname} (Explicit)"
        if self.tracknumber is not None:
            fname = f"{self.tracknumber:02}. {fname}"

        return os.path.join(self.parent_folder, f"{fname}.mp4")

    def __str__(self) -> str:
        return self.title

    def __repr__(self) -> str:
        return f"<Video - {self.title}>"


class Booklet:
    """Only for Qobuz."""

    def __init__(self, resp: dict):
        """Initialized from the `goodies` field of the Qobuz API
        response.

        >>> album_meta = client.get('v4m7e0qiorycb', 'album')
        >>> booklet = Booklet(album_meta['goodies'][0])
        >>> booklet.download()

        :param resp:
        :type resp: dict
        """
        self.__dict__.update(resp)

    def download(self, parent_folder: str, **kwargs):
        """Download the Booklet.

        :param parent_folder:
        :type parent_folder: str
        :param kwargs:
        """
        filepath = os.path.join(parent_folder, f"{self.description}.pdf")
        tqdm_download(self.url, filepath)


class Tracklist(list):
    """A base class for tracklist-like objects.

    Implements methods to give it dict-like behavior. If a Tracklist
    subclass is subscripted with [s: str], it will return an attribute s.
    If it is subscripted with [i: int] it will return the i'th track in
    the tracklist.
    """

    # anything not in parentheses or brackets
    essence_regex = re.compile(r"([^\(]+)(?:\s*[\(\[][^\)][\)\]])*")

    def download(self, **kwargs):
        """Uses the _prepare_download and _download_item methods to download
        all of the tracks contained in the Tracklist.

        :param kwargs:
        """
        self._prepare_download(**kwargs)
        if kwargs.get("conversion", False):
            has_conversion = kwargs["conversion"]["enabled"]
        else:
            has_conversion = False
            kwargs["stay_temp"] = False

        if has_conversion:
            target = self._download_and_convert_item
        else:
            target = self._download_item

        if kwargs.get("concurrent_downloads", True):
            # Tidal errors out with unlimited concurrency
            # max_workers = 15 if self.client.source == "tidal" else 90
            with concurrent.futures.ThreadPoolExecutor(15) as executor:
                futures = [executor.submit(target, item, **kwargs) for item in self]
                try:
                    concurrent.futures.wait(futures)
                except (KeyboardInterrupt, SystemExit):
                    executor.shutdown()
                    tqdm.write("Aborted! May take some time to shutdown.")
                    exit("Aborted!")

        else:
            for item in self:
                if self.client.source != "soundcloud":
                    # soundcloud only gets metadata after `target` is called
                    # message will be printed in `target`
                    click.secho(f'\nDownloading "{item!s}"', fg="blue")
                target(item, **kwargs)

        self.downloaded = True

    def _download_and_convert_item(self, item, **kwargs):
        """Downloads and converts an item.

        :param item:
        :param kwargs: should contain a `conversion` dict.
        """
        if self._download_item(item, **kwargs):
            item.convert(**kwargs["conversion"])

    def _download_item(item, **kwargs):
        """Abstract method.

        :param item:
        :param kwargs:
        """
        raise NotImplementedError

    def _prepare_download(**kwargs):
        """Abstract method.

        :param kwargs:
        """
        raise NotImplementedError

    def get(self, key: Union[str, int], default=None):
        """A safe `get` method similar to `dict.get`.

        :param key: If it is a str, get an attribute. If an int, get the item
        at the index.
        :type key: Union[str, int]
        :param default:
        """
        if isinstance(key, str):
            if hasattr(self, key):
                return getattr(self, key)

            return default

        if isinstance(key, int):
            if 0 <= key < len(self):
                return self[key]

            return default

    def set(self, key, val):
        """For consistency with `Tracklist.get`.

        :param key:
        :param val:
        """
        self.__setitem__(key, val)

    def convert(self, codec="ALAC", **kwargs):
        """Converts every item in `self`.
        Deprecated. Use _download_and_convert_item instead.

        :param codec:
        :param kwargs:
        """
        if (sr := kwargs.get("sampling_rate")) :
            if sr < 44100:
                logger.warning(
                    "Sampling rate %d is lower than 44.1kHz."
                    "This may cause distortion and ruin the track.",
                    kwargs["sampling_rate"],
                )
            else:
                logger.debug(f"Downsampling to {sr/1000}kHz")

        for track in self:
            track.convert(codec, **kwargs)

    @classmethod
    def from_api(cls, item: dict, client: Client):
        """Create an Album object from the api response of Qobuz, Tidal,
        or Deezer.

        :param resp: response dict
        :type resp: dict
        :param source: in ('qobuz', 'deezer', 'tidal')
        :type source: str
        """
        info = cls._parse_get_resp(item, client=client)

        # equivalent to Album(client=client, **info)
        return cls(client=client, **info)

    @staticmethod
    def get_cover_obj(
        cover_path: str, container: str, source: str
    ) -> Union[Picture, APIC]:
        """Given the path to an image and a quality id, return an initialized
        cover object that can be used for every track in the album.

        :param cover_path:
        :type cover_path: str
        :param quality:
        :type quality: int
        :rtype: Union[Picture, APIC]
        """

        def flac_mp3_cover_obj(cover):
            cover_obj = cover()
            cover_obj.type = 3
            cover_obj.mime = "image/jpeg"
            with open(cover_path, "rb") as img:
                cover_obj.data = img.read()

            return cover_obj

        if container == "FLAC":
            cover = Picture
        elif container == "MP3":
            cover = APIC
        elif container in ("AAC", "ALAC", "MP4"):
            cover = MP4Cover
        else:
            raise Exception(container)

        if cover is Picture:
            size_ = os.path.getsize(cover_path)
            if size_ > FLAC_MAX_BLOCKSIZE:
                raise TooLargeCoverArt(
                    f"Not suitable for Picture embed: {size_ / 10 ** 6} MB"
                )
            return flac_mp3_cover_obj(cover)

        elif cover is APIC:
            return flac_mp3_cover_obj(cover)

        elif cover is MP4Cover:
            with open(cover_path, "rb") as img:
                return cover(img.read(), imageformat=MP4Cover.FORMAT_JPEG)

    def download_message(self) -> str:
        """The message to display after calling `Tracklist.download`.

        :rtype: str
        """
        click.secho(
            f"\n\nDownloading {self.title} ({self.__class__.__name__})\n",
            fg="blue",
        )

    @staticmethod
    def _parse_get_resp(item, client):
        """Abstract.

        :param item:
        :param client:
        """
        raise NotImplementedError

    @staticmethod
    def essence(album: str) -> str:
        """Ignore text in parens/brackets, return all lowercase.
        Used to group two albums that may be named similarly, but not exactly
        the same.
        """
        match = Tracklist.essence_regex.match(album)
        if match:
            return match.group(1).strip().lower()

        return album

    def __getitem__(self, key: Union[str, int]):
        if isinstance(key, str):
            return getattr(self, key)

        if isinstance(key, int):
            return super().__getitem__(key)

    def __setitem__(self, key: Union[str, int], val: Any):
        if isinstance(key, str):
            setattr(self, key, val)

        if isinstance(key, int):
            super().__setitem__(key, val)


class YoutubeVideo:
    """Dummy class implemented for consistency with the Media API."""

    class DummyClient:
        source = "youtube"

    def __init__(self, url: str):
        self.url = url
        self.client = self.DummyClient()

    def download(
        self,
        parent_folder="StreamripDownloads",
        download_youtube_videos=False,
        youtube_video_downloads_folder="StreamripDownloads",
        **kwargs,
    ):
        filename_formatter = "%(track_number)s.%(track)s.%(container)s"
        filename = os.path.join(parent_folder, filename_formatter)

        p = subprocess.Popen(
            [
                "youtube-dl",
                "-x",
                "--add-metadata",
                "--audio-format",
                "mp3",
                "--embed-thumbnail",
                "-o",
                filename,
                self.url,
            ]
        )

        print(f"{download_youtube_videos=}")
        if download_youtube_videos:
            pv = subprocess.Popen(
                [
                    "youtube-dl",
                    "-o",
                    os.path.join(
                        youtube_video_downloads_folder, "%(title)s.%(container)s"
                    ),
                    self.url,
                ]
            )
            pv.wait()
        p.wait()

    def load_meta(self, *args, **kwargs):
        pass

    def tag(self, *args, **kwargs):
        pass