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


class AnnouncementCreate(BaseModel):
    title: str = Field(..., min_length=1, max_length=200)
    content: str = Field(..., min_length=1)


class AnnouncementUpdate(BaseModel):
    title: Optional[str] = Field(default=None, min_length=1, max_length=200)
    content: Optional[str] = None
    is_published: Optional[bool] = None


class AnnouncementResponse(BaseModel):
    id: int
    title: str
    content: str
    is_published: bool
    published_at: Optional[datetime] = None
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)