const REPEATED_PATTERN = /^(.{1,3})\1+$/u;

/**
 * Lightweight intent guard used before calling the generation APIs. It keeps
 * obvious placeholder input (for example, "111" or "aaaa") from being sent
 * to the model while allowing normal Chinese/English product descriptions.
 */
export function analyzeProductIntent(values) {
  const text = values
    .map((value) => String(value || "").trim())
    .filter(Boolean)
    .join(" ");
  if (!text) return "请至少填写一项商品信息";

  const compact = text.replace(/[\s\p{P}\p{S}]+/gu, "");
  if (!compact) return "商品信息不能只有符号，请填写真实的商品内容";
  if (/^\d+$/u.test(compact)) {
    return "商品信息看起来像占位内容，请填写真实的商品名称、品类、功效或卖点";
  }
  if (REPEATED_PATTERN.test(compact)) {
    return "商品信息看起来是重复的占位内容，请补充真实的商品信息";
  }
  if (!/[\u4e00-\u9fffA-Za-z]/u.test(compact)) {
    return "请填写包含文字的真实商品信息";
  }
  return "";
}

export function validateGenerationOptions(form, includeAnswers = true) {
  // 生成偏好均为选填，只有生成条数需要填写并进行数值校验。
  const required = [["question_count", "提问生成条数"]];
  const missing = required
    .filter(([key]) => !String(form[key] ?? "").trim())
    .map(([, label]) => label);
  if (missing.length) return `请填写${missing.join("、")}`;
  if (!Number.isInteger(Number(form.question_count)) || Number(form.question_count) < 1) {
    return "提问生成条数必须是大于 0 的整数";
  }
  if (String(form.claim_questions_per_user ?? "").trim()) {
    const claimCount = Number(form.claim_questions_per_user);
    if (!Number.isInteger(claimCount) || claimCount < 2 || claimCount > 5) {
      return "每个用户可认领的问题数量必须在 2-5 条之间";
    }
  }
  return "";
}