import os
from pathlib import Path


class Config:

    def __init__(self) -> None:

        self.host = os.getenv('HOST') or '0.0.0.0'
        self.port = int(os.getenv('PORT') or 4009)

        # This directory will be searched for <site>.txt (e.g. yandex.txt)
        # Cookies are in Netscape CSV format, see yt-dlp docs
        self.cookies_dir = Path(os.getenv('COOKIES_DIR') or 'cookies')

        # Note: yt-dlp's path trimmer also counts album_path_tmpl, not only filename
        # Why 235? 255 is the ext4 limit. 255 - len("/var/lib/musicdlp/") = 237, rounded down to 235
        self.path_length = int(os.getenv('PATH_LENGTH') or 235)

        self.tmpl = os.path.join(
            # `artists.0` instead of `artist`, because the latter can contain "feat. ..."
            os.getenv('ALBUM_PATH_TMPL') or 'music/%(artists.0)s/%(album)s',
            os.getenv('TRACK_FILE_TMPL') or '%(track)s.%(ext)s',
        )

        # Proxy URL for yt_proxied downloader (can be used for geo-restricted content)
        self.yt_proxy = os.getenv('YT_PROXY') or 'http://127.0.0.1:1080'


_config: Config | None = None


def get() -> Config:
    global _config
    if _config is None:
        _config = Config()
    return _config