import os
import tomllib
from io import BytesIO
from typing import Annotated, Self

import aiohttp
import discord
from pydantic import BaseModel, StringConstraints

StrippedStr = Annotated[str, StringConstraints(strip_whitespace=True)]


class Post(BaseModel):
    # users authorized to posts
    users: list[int]
    # where to put posts
    channel: int

    def get_channel(
        self,
        client: discord.Client,
    ) -> discord.Thread | discord.TextChannel:
        """
        Zielkanal für Posts finden
        """

        channel = client.get_channel(self.channel)
        assert isinstance(channel, discord.Thread | discord.TextChannel)

        return channel


class InfoCommand(BaseModel):
    name: StrippedStr
    description: StrippedStr = "..."
    content: StrippedStr = ""


class FileCommand(InfoCommand):
    file_url: str = ""
    file_name: str = ""

    @property
    async def as_bytes(self) -> bytes | None:
        async with aiohttp.ClientSession() as session:
            async with session.get(self.file_url) as response:
                if response.status != 200:
                    return None

                return await response.read()

    @property
    async def as_discord_file(self) -> discord.File | None:
        if (as_bytes := await self.as_bytes) is not None:
            return discord.File(
                fp=BytesIO(as_bytes),
                filename=self.file_name,
            )


class ClubInfo(BaseModel):
    channels: list[int]

    info: InfoCommand
    linktree: InfoCommand
    join: FileCommand
    fest: InfoCommand
    aktion: InfoCommand


class Config(BaseModel):
    discord_token: str
    command_prefix: str
    command_failed: str

    post: Post
    ev_info: ClubInfo

    @classmethod
    def get(cls) -> Self:
        cfg_path = os.getenv(
            key="CONFIG_PATH",
            default="/usr/local/etc/lenaverse-bot/lenaverse-bot.toml",
        )

        with open(cfg_path, "rb") as cfg_file:
            return cls.model_validate(tomllib.load(cfg_file))


CONFIG = Config.get()