"""
用户相关的 Pydantic 模式
"""
from datetime import datetime
from typing import Optional
from pydantic import BaseModel, EmailStr


class UserBase(BaseModel):
    """用户基础模式"""
    username: str
    email: Optional[EmailStr] = None


class UserCreate(UserBase):
    """创建用户请求模式"""
    password: str


class UserUpdate(BaseModel):
    """更新用户请求模式"""
    username: Optional[str] = None
    email: Optional[EmailStr] = None
    password: Optional[str] = None


class UserInDB(UserBase):
    """数据库中的用户模式"""
    id: int
    created_at: datetime
    
    class Config:
        from_attributes = True


class User(UserInDB):
    """用户响应模式（不包含敏感信息）"""
    pass


class Token(BaseModel):
    """JWT 令牌响应模式"""
    access_token: str
    token_type: str = "bearer"


class TokenData(BaseModel):
    """令牌数据模式"""
    username: Optional[str] = None