"""Glue service: adopt anonymous cart items + calendar entries for a logged-in user."""
from __future__ import annotations

from sqlalchemy import select, update, func
from sqlalchemy.ext.asyncio import AsyncSession

from shared.models.market import CartItem
from shared.models.calendars import CalendarEntry


async def adopt_session_for_user(
    session: AsyncSession,
    user_id: int,
    session_id: str,
) -> None:
    """Adopt anonymous cart items + calendar entries for a logged-in user."""
    # --- adopt cart items ---
    anon_result = await session.execute(
        select(CartItem).where(
            CartItem.deleted_at.is_(None),
            CartItem.user_id.is_(None),
            CartItem.session_id == session_id,
        )
    )
    anon_items = anon_result.scalars().all()

    if anon_items:
        # Soft-delete existing user cart
        await session.execute(
            update(CartItem)
            .where(CartItem.deleted_at.is_(None), CartItem.user_id == user_id)
            .values(deleted_at=func.now())
        )
        for ci in anon_items:
            ci.user_id = user_id

    # --- adopt calendar entries ---
    await session.execute(
        update(CalendarEntry)
        .where(CalendarEntry.deleted_at.is_(None), CalendarEntry.user_id == user_id)
        .values(deleted_at=func.now())
    )
    cal_result = await session.execute(
        select(CalendarEntry).where(
            CalendarEntry.deleted_at.is_(None),
            CalendarEntry.session_id == session_id,
        )
    )
    for entry in cal_result.scalars().all():
        entry.user_id = user_id