from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path


def load_env_file(path: Path) -> None:
    if not path.exists():
        return
    for raw_line in path.read_text(encoding="utf-8").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        os.environ.setdefault(key.strip(), value.strip())


@dataclass(slots=True)
class BotConfig:
    token: str
    server_url: str
    poll_timeout: int

    @classmethod
    def load(cls) -> "BotConfig":
        base_dir = Path(__file__).resolve().parent
        load_env_file(base_dir / ".env")
        token = os.environ.get("NEW_QWEN_BOT_TOKEN", "").strip()
        if not token:
            raise RuntimeError("NEW_QWEN_BOT_TOKEN is required")
        return cls(
            token=token,
            server_url=os.environ.get("NEW_QWEN_SERVER_URL", "http://127.0.0.1:8080").rstrip("/"),
            poll_timeout=int(os.environ.get("NEW_QWEN_POLL_TIMEOUT", "30")),
        )