import uuid
from datetime import datetime, timezone
from sqlalchemy import String, Boolean, DateTime, ForeignKey, Text
from sqlalchemy.orm import Mapped, mapped_column
from app.database import Base

class Announcement(Base):
    __tablename__ = "announcements"

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    body: Mapped[str] = mapped_column(Text, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    created_by: Mapped[str | None] = mapped_column(String(36), ForeignKey("hub_users.id", ondelete="SET NULL"), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
    expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)