from pydantic_settings import BaseSettings
from pydantic import field_validator
import re


class AppConfig(BaseSettings):
    """应用基础配置"""
    name: str = "Smart Question Bank"
    version: str = "1.0.0"
    debug: bool = False

    @field_validator('name')
    def validate_name(cls, value):
        if not value or len(value) < 2:
            raise ValueError('应用名称不能为空且至少2个字符')
        return value

    @field_validator('version')
    def validate_version(cls, value):
        if not re.match(r'^\d+\.\d+\.\d+$', value):
            raise ValueError('版本号格式必须为x.x.x')
        return value

    def to_string(self, indent: int = 0) -> str:
        """将配置转换为字符串"""
        indent_str = ' ' * indent
        result = []
        for field_name, field_value in self.__dict__.items():
            result.append(f"{indent_str}{field_name}: {field_value}")
        return '\n'.join(result)