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


class UserBase(BaseModel):
    """用户基础模型"""
    username: str
    department: str
    role: str


class UserCreate(UserBase):
    """创建用户模型"""
    password: str


class UserUpdate(BaseModel):
    """更新用户模型"""
    password: Optional[str] = None
    department: Optional[str] = None
    role: Optional[str] = None


class UserResponse(UserBase):
    """用户响应模型"""
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None
    
    class Config:
        from_attributes = True


class UserLogin(BaseModel):
    """用户登录模型"""
    username: str
    password: str