"""飞书/消息对话会话状态。"""

from __future__ import annotations

from datetime import datetime
from typing import Optional

from sqlalchemy import BigInteger, ForeignKey, Index, Integer, TIMESTAMP, UniqueConstraint, VARCHAR, func
from sqlalchemy.orm import Mapped, mapped_column

from .base import BaseNoTenant


class ConversationSession(BaseNoTenant):
    __tablename__ = "conversation_sessions"
    __table_args__ = (
        UniqueConstraint("tenant_id", "sender", name="uq_conversation_sessions_tenant_sender"),
        Index("ix_conversation_sessions_tenant_sender_last_active", "tenant_id", "sender", "last_active_at"),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    tenant_id: Mapped[int] = mapped_column(BigInteger, nullable=False, default=1, index=True)
    sender: Mapped[str] = mapped_column(VARCHAR(128), nullable=False, index=True)
    current_project_id: Mapped[Optional[int]] = mapped_column(
        BigInteger,
        ForeignKey("projects.id"),
        nullable=True,
        index=True,
    )
    last_intent: Mapped[Optional[str]] = mapped_column(VARCHAR(64), nullable=True, index=True)
    last_message_text: Mapped[Optional[str]] = mapped_column(VARCHAR(200), nullable=True)
    last_active_at: Mapped[datetime] = mapped_column(TIMESTAMP, nullable=False, default=func.now(), index=True)
    created_at: Mapped[datetime] = mapped_column(TIMESTAMP, nullable=False, default=func.now(), server_default=func.now())