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


class DepartmentBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=200)
    parent_id: Optional[str] = None


class DepartmentCreate(DepartmentBase):
    pass


class DepartmentUpdate(BaseModel):
    name: Optional[str] = Field(None, min_length=1, max_length=200)
    parent_id: Optional[str] = None


class DepartmentResponse(DepartmentBase):
    id: str
    created_at: datetime

    class Config:
        from_attributes = True