from pydantic import BaseModel, Field
from typing import Optional
from datetime import datetime

class UserImageBase(BaseModel):
    """用户形象基础模式"""
    image_url: str = Field(..., description="图片URL")
    is_default: bool = Field(False, description="是否为默认形象")

class UserImageCreate(UserImageBase):
    """创建用户形象请求"""
    pass

class UserImageInDB(UserImageBase):
    """数据库中的用户形象数据"""
    id: int
    user_id: int
    create_time: datetime
    
    class Config:
        from_attributes = True

class UserImage(UserImageInDB):
    """用户形象响应模式"""
    pass

class UserImageUpdate(BaseModel):
    """更新用户形象请求"""
    image_url: Optional[str] = Field(None, description="图片URL")
    is_default: Optional[bool] = Field(None, description="是否为默认形象")