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


class User(BaseModel):
    id: Optional[int] = None
    username: str = Field(..., max_length=20)
    email: str = Field(..., max_length=120)
    password: str = Field(..., max_length=60)


class Teacher(BaseModel):
    id: int
    name: str = Field(..., max_length=100)
    department: str = Field(..., max_length=100)


class Review(BaseModel):
    id: Optional[int] = None
    content: str
    rating: int
    date_posted: datetime = Field(default_factory=datetime.now)
    teacher_id: int
    user_id: Optional[int] = None