"""会话成员模型"""

from datetime import datetime, timezone

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

from app.database import Base


class ConversationMember(Base):
    __tablename__ = "conversation_members"
    __table_args__ = (
        UniqueConstraint("conversation_id", "user_id", name="uq_conv_user"),
    )

    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
    )
    user_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    role: Mapped[str] = mapped_column(String(20), default="member")  # owner / admin / member
    nickname: Mapped[str | None] = mapped_column(String(50), nullable=True)  # 群内昵称
    last_read_message_id: Mapped[str | None] = mapped_column(String(36), nullable=True)
    is_pinned: Mapped[bool] = mapped_column(Boolean, default=False)  # 置顶
    pinned_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    is_muted: Mapped[bool] = mapped_column(Boolean, default=False)  # 免打扰
    joined_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())
    left_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)

    # 关系
    conversation = relationship("Conversation", back_populates="members")
    user = relationship("User", back_populates="conversations")