import { NextRequest, NextResponse } from "next/server";

/** 支持：主页 xiaohongshu.com/user/profile/xxx、xhslink.com/m/xxx；笔记 xhslink.com/o/xxx、xiaohongshu.com/explore/xxx */
const XH_PROFILE_PATTERN = /^https?:\/\/(www\.)?(xiaohongshu\.com|xhslink\.com)\/user\/profile\/[a-zA-Z0-9_-]+/i;
const XH_SHORT_PATTERN = /^https?:\/\/xhslink\.com\/m\/[a-zA-Z0-9_-]+/i;
const XH_NOTE_PATTERN = /^https?:\/\/(xhslink\.com\/o\/|(www\.)?xiaohongshu\.com\/explore\/)[a-zA-Z0-9_-]+/i;

function isValidUrl(url: string): boolean {
  const s = url.trim();
  if (!s) return false;
  if (XH_PROFILE_PATTERN.test(s) || XH_SHORT_PATTERN.test(s) || XH_NOTE_PATTERN.test(s)) return true;
  return false;
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const url = String(body?.url || body?.id || "").trim();

    if (!url) {
      return NextResponse.json({ valid: false, error: "请输入小红书链接" }, { status: 400 });
    }

    if (!isValidUrl(url)) {
      return NextResponse.json({ valid: false, error: "请输入有效的主页链接或笔记链接（xhslink.com/m/xxx 或 xhslink.com/o/xxx）" }, { status: 200 });
    }

    return NextResponse.json({ valid: true, url });
  } catch {
    return NextResponse.json({ valid: false, error: "校验失败" }, { status: 500 });
  }
}