import type { CommunicationRequest } from 'fhir/r4';

// Unread messages across the listed conversations; undefined when the listing failed, because unread is then unknown.
export const inboxUnreadCount = (
    threads: CommunicationRequest[],
    unreadFor: (threadId: string) => number,
    listingFailed: boolean,
): number | undefined =>
    listingFailed ? undefined : threads.reduce((total, request) => total + unreadFor(request.id as string), 0);

// The Inbox tab carries a number only when there is unread to report: never at zero, never while unknown.
export const inboxTabLabel = (label: string, unread: number | undefined): string =>
    unread !== undefined && unread > 0 ? `${label} (${unread})` : label;