"""群公告模型"""

from datetime import datetime

from sqlalchemy import String, DateTime, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


class GroupAnnouncement(Base):
    __tablename__ = "group_announcements"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    conversation_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("conversations.id", ondelete="CASCADE"), nullable=False
    )
    author_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    content: Mapped[str] = mapped_column(String(1000), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=lambda: datetime.utcnow(), onupdate=lambda: datetime.utcnow()
    )

    author = relationship("User", foreign_keys=[author_id])