from typing import Any, Generic, Optional, TypeVar
from pydantic import BaseModel, Field
# from pydantic.generics import GenericModel

T = TypeVar('T')

class StandardResponse(BaseModel, Generic[T]):
    """标准API响应格式"""
    code: int = Field(200, description="状态码，200表示成功，其他值表示错误")
    message: Optional[str] = Field(None, description="消息，通常在错误时提供")
    data: Optional[T] = Field(None, description="响应数据")

    class Config:
        from_attributes = True
        json_schema_extra = {
            "example": {
                "code": 200,
                "message": None,
                "data": {}
            }
        }

class ErrorResponse(BaseModel):
    """错误响应格式"""
    code: int = Field(500, description="错误码，非200值")
    message: str = Field(..., description="错误消息")
    data: None = Field(None, description="数据字段，错误时为null")

    class Config:
        from_attributes = True
        json_schema_extra = {
            "example": {
                "code": 500,
                "message": "业务处理错误",
                "data": None
            }
        }