"""YouTube DownLoad."""

from datetime import datetime
from pathlib import Path
from typing import Any

from yt_dlp import YoutubeDL

from rwx import Object
from rwx.fs import read_file_yaml
from rwx.log import stream as log

EXT = "webm"
TIMESTAMP = "%Y%m%d%H%M%S"
URL = "https://youtube.com"


# ╭─────────╮
# │ classes │
# ╰─────────╯


class Cache(Object):
    """YouTube local cache."""

    def __init__(self, root_file: Path) -> None:
        self.root_file = root_file.resolve()
        self.root_directory = self.root_file.parent
        self.load()

    def load(self) -> None:
        d = read_file_yaml(self.root_file)
        log.info(d)


class Channel(Object):
    """YouTube channel."""

    def __init__(self, channel_id: str) -> None:
        """Set objects tree.

        :param channel_id: channel identifier
        :type channel_id: str
        """
        d = extract_videos(channel_id)
        # channel
        self.uid = d["channel_id"]
        self.title = d["channel"]
        self.followers = int(d["channel_follower_count"])
        self.description = d["description"]
        self.tags = d["tags"]
        self.thumbnails = [thumbnail["url"] for thumbnail in d["thumbnails"]]
        self.thumbnail = self.thumbnails[-1]
        self.uploader_id = d["uploader_id"]
        self.uploader = d["uploader"]
        # videos
        self.videos = [
            Video(entry)
            for entry in reversed(d["entries"])
            if entry["availability"] != "subscriber_only"
        ]
        # playlists
        d = extract_playlists(channel_id)
        self.playlists = [Playlist(entry) for entry in reversed(d["entries"])]


# TODO Format
class Format(Object):
    """YouTube format."""

    @staticmethod
    def get(d: dict, key: str) -> str | None:
        value = d.get(key)
        match value:
            case "none":
                return None
            case _:
                return value

    def __init__(self, d: dict) -> None:
        """Set format info.

        :param d: format info
        :type d: dict
        """
        self.format_id = d["format_id"]
        self.format_note = d.get("format_note")
        self.quality = d.get("quality")
        self.language = d.get("language")
        self.ext = d["ext"]
        # video
        self.video_codec = Format.get(d, "vcodec")
        if self.video_codec:
            self.video_dynamic_range = d["dynamic_range"]
            self.video_fps = d["fps"]
            self.video_height = int(d["height"])
            self.video_bit_rate = d["vbr"]
            self.video_ext = d["video_ext"]
            self.video_width = int(d["width"])
        # audio
        self.audio_codec = Format.get(d, "acodec")
        if self.audio_codec:
            self.audio_bit_rate = d["abr"]
            self.audio_sampling_rate = d["asr"]
            self.audio_ext = d["audio_ext"]


# TODO Playlist/extra
class Playlist(Object):
    """YouTube playlist."""

    def __init__(self, d: dict) -> None:
        """Set playlist info.

        :param d: playlist info
        :type d: dict
        """
        self.uid = d["id"]
        self.title = d["title"]


# TODO Thumbnail


class Video(Object):
    """YouTube video."""

    def __init__(self, d: dict) -> None:
        """Set video info.

        :param d: video info
        :type d: dict
        """
        self.uid = d["id"]
        self.title = d["title"]
        self.description_cut = d["description"]
        self.duration = int(d["duration"])
        self.thumbnail = d["thumbnails"][-1]["url"]

    def load_extra(self):
        self.at = datetime.now().strftime(TIMESTAMP)
        d = extract_video(self.uid)
        self.audio_formats = []
        self.video_formats = []
        for entry in d["formats"]:
            f = Format(entry)
            if f.video_codec:
                self.video_format = f
                self.video_formats.append(f)
            elif f.audio_codec:
                self.audio_format = f
                self.audio_formats.append(f)
        thumbnail = d["thumbnails"][-1]["url"]
        # TODO compare existing thumbnail
        self.description = d["description"]
        self.channel_id = d["channel_id"]
        self.duration = int(d["duration"])
        self.views = int(d["view_count"])
        self.categories = d["categories"]
        self.tags = d["tags"]
        # TODO automatic_captions
        # TODO subtitles
        self.chapters = d["chapters"]
        self.likes = d["like_count"]
        self.timestamp = datetime.fromtimestamp(d["timestamp"]).strftime(TIMESTAMP)
        self.fulltitle = d["fulltitle"]


# ╭──────────╮
# │ download │
# ╰──────────╯


def download_video(video_id: str | None) -> None:
    if video_id:
        ytdl(
            {
                "format": "+".join([f"best{av}[ext={EXT}]" for av in ["video", "audio"]]),
                "outtmpl": "%(id)s.%(ext)s",
                "postprocessors": [
                    {
                        "key": "SponsorBlock",
                        "categories": ["sponsor"],
                    },
                    {
                        "key": "ModifyChapters",
                        "remove_sponsor_segments": ["sponsor"],
                    },
                ],
                "writesubtitles": True,
                "writethumbnail": True,
            },
        ).download([url_video(video_id)])


# ╭─────────╮
# │ extract │
# ╰─────────╯


def extract(url: str) -> dict[str, Any]:
    """Return extracted dict.

    :rtype: dict
    """
    d = ytdl(
        {
            "extract_flat": True,
            "skip_download": True,
        },
    ).extract_info(url, download=False)
    log.debug(d)
    return d


def extract_playlist(playlist_id: str) -> dict:
    """Return extracted playlist dict.

    :param playlist_id: playlist identifier
    :type playlist_id: str
    :rtype: dict
    """
    return extract(url_playlist(playlist_id))


def extract_playlists(channel_id: str) -> dict:
    """Return extracted playlists dict.

    :param channel_id: channel identifier
    :type channel_id: str
    :rtype: dict
    """
    return extract(url_playlists(channel_id))


def extract_video(video_id: str) -> dict:
    """Return extracted video dict.

    :param video_id: video identifier
    :type video_id: str
    :rtype: dict
    """
    return extract(url_video(video_id))


def extract_videos(channel_id: str) -> dict:
    """Return extracted videos dict.

    :param channel_id: channel identifier
    :type channel_id: str
    :rtype: dict
    """
    return extract(url_videos(channel_id))


# ╭──────╮
# │ next │
# ╰──────╯


def next_download(videos: list[str]) -> str | None:
    for index, video_id in enumerate(videos):
        if not Path(f"{video_id}.mp4").exists():
            log.info(f"{index} ∕ {len(videos)}")
            return video_id
    return None


# ╭─────╮
# │ url │
# ╰─────╯


def url_channel(channel_id: str) -> str:
    """Return channel URL.

    :param channel_id: channel identifier
    :type channel_id: str
    :rtype: str
    """
    return f"{URL}/channel/{channel_id}"


def url_playlist(playlist_id: str) -> str:
    """Return playlist URL.

    :param playlist_id: playlist identifier
    :type playlist_id: str
    :rtype: str
    """
    return f"{URL}/playlist?list={playlist_id}"


def url_playlists(channel_id: str) -> str:
    """Return playlists URL.

    :param channel_id: channel identifier
    :type channel_id: str
    :rtype: str
    """
    return f"{url_channel(channel_id)}/playlists"


def url_video(video_id: str) -> str:
    """Return video URL.

    :param video_id: video identifier
    :type video_id: str
    :rtype: str
    """
    return f"{URL}/watch?v={video_id}"


def url_videos(channel_id: str) -> str:
    """Return videos URL.

    :param channel_id: channel identifier
    :type channel_id: str
    :rtype: str
    """
    return f"{url_channel(channel_id)}/videos"


# ╭──────╮
# │ ytdl │
# ╰──────╯


def ytdl(opt: dict) -> YoutubeDL:
    options = {
        **opt,
        "ignoreerrors": False,
        "quiet": False,
    }
    log.info(options)
    return YoutubeDL(options)