"""
Python representation of the "config.txt" file inside the WebDAV directory.
"""

from io import BytesIO
from logging import getLogger
from tomllib import loads as toml_loads
from typing import Any

from pydantic import BaseModel
from tomli_w import dump as toml_dump
from webdav3.exceptions import RemoteResourceNotFound

from .dav_common import caldav_list
from .dav_file import DavFile
from .settings import SETTINGS

_logger = getLogger(__name__)


class TickerUIConfig(BaseModel):
    """
    Configuration for how the UI displays the ticker content.
    """

    color: str = "primary"


class TickerConfig(TickerUIConfig):
    """
    Section "[ticker]" in "config.txt".

    Combined configuration for the ticker.
    """

    file_name: str = "ticker"
    separator: str = " +++ "
    comment_marker: str = "#"


class ImageUIConfig(BaseModel):
    """
    Configuration for how the UI displays the image carousel.
    """

    height: int = 300
    contain: bool = False
    speed: int = 10000


class ImageConfig(ImageUIConfig):
    """
    Sections "[image*]" in "config.txt".
    """

    mode: str = "RGB"
    save_params: dict[str, Any] = {
        "format": "JPEG",
        "quality": 85,
    }


class CalendarUIConfig(BaseModel):
    """
    Configuration for how the UI displays the calendar carousel.
    """

    speed: int = 10000


class CalendarConfig(CalendarUIConfig):
    """
    Sections "[calendar*]" in "config.txt".
    """

    future_days: int = 365
    aggregates: dict[str, list[str]] = {}


class ServerUIConfig(BaseModel):
    """
    Section "[server]" in "config.txt".
    """

    name: str = "OEKZident"
    host: str = "https://oekzident.de"


class LogoUIConfig(BaseModel):
    """
    Section "[logo]" in "config.txt".
    """

    above: str = "Technisches Hilfswerk"
    below: str = "OV Musterstadt"


class Config(BaseModel):
    """
    Main representation of "config.txt".
    """

    image_dir: str = "image"
    text_dir: str = "text"
    file_dir: str = "file"

    logo: LogoUIConfig = LogoUIConfig()
    image: ImageConfig = ImageConfig()
    server: ServerUIConfig = ServerUIConfig()
    ticker: TickerConfig = TickerConfig()
    calendar: CalendarConfig = CalendarConfig()

    @classmethod
    async def get(cls) -> "Config":
        """
        Load the configuration instance from the server using `TOML`.
        """

        dav_file = DavFile(SETTINGS.config_path)

        try:
            cfg = cls.parse_obj(toml_loads(await dav_file.as_string))

        except RemoteResourceNotFound:
            _logger.warning(
                f"Config file {SETTINGS.config_path!r} not found, creating ..."
            )

            cfg = cls()
            cfg.calendar.aggregates["All Events"] = list(await caldav_list())

            buffer = BytesIO()
            toml_dump(cfg.dict(), buffer)
            buffer.seek(0)
            await dav_file.write(buffer.read())

        return cfg