"""Session model — one chat session = one idea discussion."""

from typing import Optional

from sqlalchemy import ForeignKey, String, Text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.base import SQLBase, TimestampMixin, UUIDMixin


class Session(SQLBase, UUIDMixin, TimestampMixin):
    __tablename__ = "sessions"

    user_id: Mapped[UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    title: Mapped[str] = mapped_column(
        String(255), nullable=False, default="Новое обсуждение"
    )
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="active", index=True
    )
    idea_id: Mapped[Optional[UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("ideas.id", ondelete="SET NULL"),
        nullable=True,
    )