from __future__ import annotations

import json
import os
from dataclasses import dataclass
from pathlib import Path

from dotenv import load_dotenv


@dataclass(slots=True)
class BotSettings:
    bot_token: str
    channel_id: int
    channel_message_id: int
    config_path: Path
    state_path: Path
    admin_ids: set[int]
    hidden_link_url: str
    hidden_link_char: str


def _parse_admin_ids(value: str) -> set[int]:
    ids = set()
    for chunk in value.split(","):
        chunk = chunk.strip()
        if chunk:
            ids.add(int(chunk))
    return ids


def load_settings() -> BotSettings:
    load_dotenv()

    return BotSettings(
        bot_token=os.environ["BOT_TOKEN"],
        channel_id=int(os.environ["CHANNEL_ID"]),
        channel_message_id=int(os.environ["CHANNEL_MESSAGE_ID"]),
        config_path=Path(os.environ.get("CONFIG_PATH", "config/actors.json")),
        state_path=Path(os.environ.get("STATE_PATH", "data/state.json")),
        admin_ids=_parse_admin_ids(os.environ.get("ADMIN_IDS", "")),
        hidden_link_url=os.environ.get("HIDDEN_LINK_URL", ""),
        hidden_link_char=os.environ.get("HIDDEN_LINK_CHAR", "​"),
    )


def load_actor_config(path: Path) -> dict:
    with path.open("r", encoding="utf-8") as file:
        return json.load(file)