"""消息表情回应模型"""

from datetime import datetime

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

from app.database import Base


class MessageReaction(Base):
    __tablename__ = "message_reactions"
    __table_args__ = (
        UniqueConstraint("message_id", "user_id", "emoji", name="uq_msg_reaction"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True)
    message_id: Mapped[str] = mapped_column(String(36), ForeignKey("messages.id", ondelete="CASCADE"))
    user_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="CASCADE"))
    emoji: Mapped[str] = mapped_column(String(10), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())

    message = relationship("Message")
    user = relationship("User", foreign_keys=[user_id])