import { apiPost } from "@/lib/api";
import { parseLevelLabel, type UserLevel } from "@/lib/user-level";

export type CustomUserLabel = {
  levelLabel?: UserLevel;
  referralCode?: string;
};

function pickString(v: unknown): string {
  return typeof v === "string" ? v.trim() : String(v ?? "").trim();
}

export async function fetchCustomUserLabel(): Promise<CustomUserLabel> {
  const raw = await apiPost<unknown>("/custom/get/label", {});
  const root = raw && typeof raw === "object" ? (raw as Record<string, unknown>) : {};
  const data =
    root.data && typeof root.data === "object" && root.data !== null
      ? (root.data as Record<string, unknown>)
      : root;

  const levelRaw =
    data.levelLabel ?? data.level ?? data.label ?? root.levelLabel ?? root.level ?? root.label;
  const levelLabel = parseLevelLabel(levelRaw) ?? undefined;

  const referralCode =
    pickString(
      data.referralCode ??
        data.referral_code ??
        data.code ??
        root.referralCode ??
        root.referral_code ??
        root.code,
    ) || undefined;

  return { levelLabel, referralCode };
}

/** 静默拉取用户标签，接口失败时返回 null，避免阻断页面渲染 */
export async function tryFetchCustomUserLabel(): Promise<CustomUserLabel | null> {
  try {
    return await fetchCustomUserLabel();
  } catch {
    return null;
  }
}