/**
 * Return participantIds from allParticipantIds that have no entry
 * in existingResultParticipantIds. Used to find participants who
 * need a 0-QP row after a qualifying event is finalized.
 */
export function findParticipantsWithoutResults(
  allParticipantIds: string[],
  existingResultParticipantIds: Set<string>
): string[] {
  return allParticipantIds.filter((id) => !existingResultParticipantIds.has(id));
}

/**
 * Filter incoming batch results to only those whose participantId
 * is not already in the set of existing result participantIds.
 */
export function filterNewResults(
  incoming: { participantId: string; placement: number }[],
  existingParticipantIds: Set<string>
): { participantId: string; placement: number }[] {
  return incoming.filter((r) => !existingParticipantIds.has(r.participantId));
}