from pydantic import field_validator
from pydantic_settings import BaseSettings, SettingsConfigDict
import os


def _read_nonebot_config(name: str) -> str:
    """从 NoneBot driver.config 读取配置；测试或独立加载模块时静默回退。

    与 onmyoji_gacha/config.py 同模式：NoneBot 会把 .env 注入 driver.config
    而不是系统环境变量，积分 API 的 token 需要从这里回退读取。
    """

    try:
        from nonebot import get_driver

        driver_config = get_driver().config
    except Exception:
        return ""
    value = getattr(driver_config, name.lower(), "")
    return str(value) if value is not None else ""


def _first_setting(*names: str, default: str = "") -> str:
    """按业务优先级读取多个兼容配置名（环境变量 → NoneBot driver.config）。"""

    for name in names:
        value = os.getenv(name, "") or _read_nonebot_config(name)
        if value:
            return value
    return default


class Config(BaseSettings):
    """Points system configuration."""

    model_config = SettingsConfigDict(
        extra="ignore",
    )

    # xapi /bot/points 运行时 API 配置
    POINTS_API_HOST: str = _first_setting(
        "DANDING_POINTS_API_HOST",
        default="https://api.danding.vip/bot/points",
    )
    BOT_USER: str = _first_setting("DANDING_BOT_USER", default="1424473282")
    BOT_TOKEN: str = _first_setting(
        "DANDING_BOT_TOKEN",
        "DANDING_API_TOKEN",
        "BOT_TOKEN",
    )

    @field_validator("POINTS_API_HOST")
    @classmethod
    def validate_api_host(cls, value):
        if not value:
            raise ValueError("POINTS_API_HOST cannot be empty")
        return value.rstrip("/")

    @field_validator("BOT_USER")
    @classmethod
    def validate_bot_user(cls, value):
        if not value:
            raise ValueError("BOT_USER cannot be empty")
        return value