export const DEFAULT_VIDEO_MARK_GENERATION_PROMPT =
  "重点遵循已标记元素：{{labels}}";

export function composeVideoMarkGenerationPrompt({
  labels,
  template,
}: {
  labels: string[];
  template?: string;
}) {
  const normalizedLabels = Array.from(
    new Set(labels.map((label) => String(label || "").trim()).filter(Boolean)),
  );
  if (normalizedLabels.length === 0) return "";

  const source =
    template === undefined ? DEFAULT_VIDEO_MARK_GENERATION_PROMPT : template.trim();
  if (!source) return "";

  return source
    .replaceAll("{{labels}}", normalizedLabels.map((label) => `@${label}`).join("、"))
    .replaceAll("{{plainLabels}}", normalizedLabels.join("、"));
}