"""
Status matching helpers.

Kept separate from companies.py because this is about order lifecycle
state rather than company identity - a different axis of classification
that grows independently.

The model is deliberately an allowlist, not a denylist: ACTIVE_STATUSES
is the small set of statuses that represent real work still to do
(just "Created" by default). Anything NOT in ACTIVE_STATUSES or
CANCELLED_STATUSES is treated as done, automatically - including
statuses this app has never been told about by name (like a JIRA
automation status such as "1st Contact Attempt" that fires after a
ticket is already handled). That's on purpose: enumerating every
possible "this means it's done" status would be a losing game as more
JIRA-side automation gets added; only naming the couple of statuses
that mean "not done yet" is far more robust.

Matching is case-insensitive since JIRA and ShipStation don't
necessarily agree on casing (e.g. "Cancelled" vs "cancelled").
"""
from __future__ import annotations

from app import config


def parse_status_list(raw: str) -> set[str]:
    return {s.strip().lower() for s in (raw or "").split(",") if s.strip()}


def status_in(status: str | None, status_set: set[str]) -> bool:
    return (status or "").strip().lower() in status_set


def get_active_statuses() -> set[str]:
    """Statuses that mean real, unfinished work - default just 'Created'."""
    return parse_status_list(config.get("ACTIVE_STATUSES", config.DEFAULT_ACTIVE_STATUSES))


def get_cancelled_statuses() -> set[str]:
    return parse_status_list(config.get("CANCELLED_STATUSES", config.DEFAULT_CANCELLED_STATUSES))


def find_new_cancellations(status_changes: list[dict], cancelled_statuses: set[str]) -> list[dict]:
    """
    From a batch of status changes, return only the ones that just BECAME
    cancelled this import (old status wasn't already cancelled, new one
    is) - so we notify once, at the moment it happens, not every import
    thereafter.
    """
    return [
        change
        for change in status_changes
        if status_in(change["new_status"], cancelled_statuses)
        and not status_in(change["old_status"], cancelled_statuses)
    ]