export type ClassroomGenerationResumeMode = 'none' | 'scenes' | 'media';

/**
 * Published learner bundles are immutable course content. Even if a corrupt or
 * legacy cache unexpectedly carries outlines, opening it must never call the
 * scene/media generation pipeline. Authoring classrooms retain the historical
 * interrupted-generation recovery behavior.
 */
export function classroomGenerationResumeMode(input: {
  learnerMode: boolean;
  generationComplete: boolean;
  outlineOrders: readonly number[];
  sceneOrders: readonly number[];
}): ClassroomGenerationResumeMode {
  if (input.learnerMode) return 'none';

  const completedOrders = new Set(input.sceneOrders);
  const hasPendingScenes =
    !input.generationComplete && input.outlineOrders.some((order) => !completedOrders.has(order));
  if (hasPendingScenes) return 'scenes';
  return input.outlineOrders.length > 0 ? 'media' : 'none';
}