from sqlalchemy import select, update
from models.calendars import CalendarEntry
from sqlalchemy import func

async def adopt_session_entries_for_user(session, user_id: int, session_id: str | None) -> None:
    if not session_id:
        return
    # (Optional) Mark any existing entries for this user as deleted to avoid duplicates
    await session.execute(
        update(CalendarEntry)
        .where(CalendarEntry.deleted_at.is_(None), CalendarEntry.user_id == user_id)
        .values(deleted_at=func.now())
    )
    # Reassign anonymous entries to the user
    result = await session.execute(
        select(CalendarEntry).where(
            CalendarEntry.deleted_at.is_(None),
            CalendarEntry.session_id == session_id
        )
    )
    anon_entries = result.scalars().all()
    for entry in anon_entries:
        entry.user_id = user_id
    # No commit here; caller will commit