"""验证业务配置：SDK 的 .env（AppID/AppSecret 等）之上再读验证参数。

全部项都有内置默认值，.env 里按需覆盖；取值越界或非法启动即报错。
"""

from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path

from dotenv import load_dotenv

# 幂等：qqbotsdk 导入时也会 load_dotenv()，且不会覆盖已存在的环境变量
load_dotenv()


def _int_env(name: str, default: int, lo: int, hi: int) -> int:
    raw = os.getenv(name, "").strip()
    if not raw:
        return default
    try:
        value = int(raw)
    except ValueError:
        raise ValueError(f"{name} 应为整数，实际: {raw!r}") from None
    if not lo <= value <= hi:
        raise ValueError(f"{name} 应在 {lo}~{hi} 之间，实际: {value}")
    return value


def _bool_env(name: str, default: bool) -> bool:
    raw = os.getenv(name, "").strip().lower()
    if not raw:
        return default
    if raw in ("1", "true", "yes", "on"):
        return True
    if raw in ("0", "false", "no", "off"):
        return False
    raise ValueError(f"{name} 应为 true/false，实际: {raw!r}")


@dataclass(frozen=True, slots=True)
class AuthConfig:
    """验证业务参数，含义与默认值见 .env.example。"""

    verify_timeout_minutes: int
    pending_mute_hours: int
    timeout_kick: bool
    timeout_fallback_mute_hours: int
    captcha_options: int
    verified_trust_days: int
    foreign_click_limit: int
    foreign_click_mute_minutes: int
    data_dir: Path

    @classmethod
    def load(cls) -> "AuthConfig":
        return cls(
            verify_timeout_minutes=_int_env("VERIFY_TIMEOUT_MINUTES", 10, 1, 1440),
            pending_mute_hours=_int_env("PENDING_MUTE_HOURS", 24, 1, 24 * 30),
            timeout_kick=_bool_env("TIMEOUT_KICK", True),
            timeout_fallback_mute_hours=_int_env(
                "TIMEOUT_FALLBACK_MUTE_HOURS", 72, 1, 24 * 30
            ),
            captcha_options=_int_env("CAPTCHA_OPTIONS", 4, 2, 5),
            verified_trust_days=_int_env("VERIFIED_TRUST_DAYS", 0, 0, 365),
            foreign_click_limit=_int_env("FOREIGN_CLICK_LIMIT", 3, 1, 100),
            foreign_click_mute_minutes=_int_env("FOREIGN_CLICK_MUTE_MINUTES", 5, 1, 1440),
            data_dir=Path(os.getenv("DATA_DIR", "data")),
        )