from typing import Generic, TypeVar

from pydantic import BaseModel

T = TypeVar("T")


class ApiResponse(BaseModel, Generic[T]):
    """统一响应：所有业务接口使用相同的 `code/message/data` 结构。"""

    code: str = "OK"
    message: str = "success"
    data: T | None = None


def ok(data: T | None = None) -> ApiResponse[T]:
    """响应封装：生成成功响应对象。"""
    return ApiResponse(data=data)