export type CollapsedAllocationGroups = Set<string> | "all";

export function createInitialCollapsedAllocationGroups(): CollapsedAllocationGroups {
  return new Set<string>();
}

export function toggleCollapsedAllocationGroup(
  previous: CollapsedAllocationGroups,
  groupIds: string[],
  resourceId: string,
): CollapsedAllocationGroups {
  if (previous === "all") {
    const next = new Set(groupIds);
    next.delete(resourceId);
    return next;
  }

  const next = new Set(previous);
  if (next.has(resourceId)) {
    next.delete(resourceId);
  } else {
    next.add(resourceId);
  }
  return next;
}

export function collapseAllAllocationGroups(): CollapsedAllocationGroups {
  return "all";
}

export function expandAllAllocationGroups(): CollapsedAllocationGroups {
  return new Set<string>();
}