"""
待办事项相关的 Pydantic 模式
"""
from datetime import datetime
from typing import Optional
from pydantic import BaseModel


class TodoBase(BaseModel):
    """待办事项基础模式"""
    title: str


class TodoCreate(TodoBase):
    """创建待办事项请求模式"""
    pass


class TodoUpdate(BaseModel):
    """更新待办事项请求模式"""
    title: Optional[str] = None
    done: Optional[bool] = None


class TodoInDB(TodoBase):
    """数据库中的待办事项模式"""
    id: int
    done: bool
    created_at: datetime
    user_id: int
    
    class Config:
        from_attributes = True


class Todo(TodoInDB):
    """待办事项响应模式"""
    pass