from __future__ import annotations

import os
from dataclasses import dataclass
from typing import Optional


@dataclass
class Settings:
    telegram_token: str
    boinc_host: str = "localhost"
    boinc_port: int = 31416
    boinc_password: Optional[str] = None
    boinccmd_path: str = "boinccmd"
    sample_output: Optional[str] = None
    refresh_seconds: int = 30

    @classmethod
    def from_env(cls) -> "Settings":
        token = os.getenv("TELEGRAM_TOKEN") or os.getenv("BOT_TOKEN")
        if not token:
            raise ValueError("Set TELEGRAM_TOKEN (or BOT_TOKEN) in the environment")

        host = os.getenv("BOINC_HOST", "localhost")
        port = int(os.getenv("BOINC_PORT", "31416"))
        password = os.getenv("BOINC_PASSWORD")
        boinccmd_path = os.getenv("BOINC_CMD", "boinccmd")
        sample_output = os.getenv("BOINC_SAMPLE_FILE")
        refresh_seconds = int(os.getenv("REFRESH_SECONDS", "30"))

        return cls(
            telegram_token=token,
            boinc_host=host,
            boinc_port=port,
            boinc_password=password,
            boinccmd_path=boinccmd_path,
            sample_output=sample_output,
            refresh_seconds=refresh_seconds,
        )