"""
Read-only queries against the local order cache.

Separate from app/workers.py (which owns saving orders and dashboard
stats) because this module is about a service asking "what do I
already know about" before it fetches - a different concern that other
sources (ShipStation, Odoo) will likely need their own version of too.
"""
from __future__ import annotations

from typing import List

from sqlalchemy import select

from app.database import get_session
from app.models import Order
from app.status_rules import status_in


def get_open_ticket_numbers(source: str, terminal_statuses: set[str]) -> List[str]:
    """
    Ticket numbers for a source that haven't reached a terminal status
    yet - i.e. still worth re-fetching to catch status changes (like a
    cancellation) even if the ticket wasn't created today.
    """
    session = get_session()
    try:
        rows = session.execute(
            select(Order.ticket_number, Order.status).where(
                Order.source == source,
                Order.ticket_number.is_not(None),
            )
        ).all()
    finally:
        session.close()

    return [
        ticket_number
        for ticket_number, status in rows
        if ticket_number and not status_in(status, terminal_statuses)
    ]