"""ORM model for conversation share links.

A share link is a short, revocable code created by a user for *one* of their
conversations. Redeeming it copies that single conversation into the redeemer's
account. The table only stores the link itself — the conversation is copied
lazily at import time.
"""

from __future__ import annotations

from datetime import UTC, datetime

from sqlalchemy import Boolean, String
from sqlalchemy.orm import Mapped, mapped_column

from deerflow.persistence.base import Base
from deerflow.persistence.types import BeijingDateTime


class ThreadShareRow(Base):
    __tablename__ = "thread_shares"

    # Short, URL-safe, unguessable code embedded in the share link.
    share_code: Mapped[str] = mapped_column(String(32), primary_key=True)
    # The user who created the share.
    owner_user_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    # The single conversation (thread) this link shares.
    thread_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    # Soft-disable: a revoked link can no longer be previewed or imported.
    revoked: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    # Share mode:
    #   "import" — recipient (a logged-in user) copies the conversation into
    #              their own account and can keep chatting in the copy.
    #   "view"   — a public, read-only static page anyone can open without
    #              logging in; viewers cannot send new messages.
    mode: Mapped[str] = mapped_column(String(16), nullable=False, default="import", server_default="import")
    created_at: Mapped[datetime] = mapped_column(BeijingDateTime(), nullable=False, default=lambda: datetime.now(UTC))