"use client";

import { useEffect, useState } from "react";
import { usePayStatusPoll } from "@/app/lib/usePayStatusPoll";

const COOKIE_NAME = "nomadvip_pay_order";

function getCookie(name: string): string | null {
  if (typeof document === "undefined") return null;
  const match = document.cookie.match(new RegExp(`(?:^|; )${name}=([^;]*)`));
  return match ? decodeURIComponent(match[1]) : null;
}

function parseUserIdFromOrderId(orderId: string): string {
  if (!orderId?.includes("_order_")) return "";
  const prefix = orderId.split("_order_")[0];
  const parts = prefix.split("_");
  return parts.length >= 2 ? parts.slice(0, -1).join("_") : "";
}

function SuccessWithRedirect() {
  useEffect(() => {
    const t = setTimeout(() => {
      window.location.href = "/";
    }, 2000);
    return () => clearTimeout(t);
  }, []);
  return (
    <div className="flex min-h-screen flex-col items-center justify-center bg-[#f0f4f8] px-4">
      <div className="animate__animated animate__zoomIn w-full max-w-md rounded-2xl bg-white p-10 text-center shadow-lg" style={{ animationFillMode: "both" }}>
        <div className="mx-auto mb-5 flex h-20 w-20 items-center justify-center rounded-full bg-emerald-50 text-5xl">
          ✅
        </div>
        <h2 className="text-2xl font-bold text-slate-800">支付成功</h2>
        <p className="mt-3 text-slate-500">感谢您的支持，VIP 权益已开通</p>
        <p className="mt-2 text-xs text-slate-400">2 秒后自动返回首页</p>
        <a
          href="/"
          onClick={(e) => { e.preventDefault(); window.location.href = "/"; }}
          className="mt-8 inline-flex items-center gap-2 rounded-full bg-sky-500 px-8 py-3 font-semibold text-white transition-colors hover:bg-sky-600"
        >
          ← 立即返回首页
        </a>
      </div>
    </div>
  );
}

export default function PaidPage() {
  const [status, setStatus] = useState<"pending" | "success" | "fail">("pending");
  const [fromUrl, setFromUrl] = useState<string | null>(null);

  usePayStatusPoll((orderId) => {
    const uid = parseUserIdFromOrderId(orderId || "");
    const raw = getCookie(COOKIE_NAME);
    const oid = raw?.split("|")[0]?.trim() || orderId || "";
    const userId = uid || parseUserIdFromOrderId(oid);
    if (userId) {
      try {
        localStorage.setItem("paidType", "vip");
        localStorage.setItem("userName", userId);
      } catch {}
    }
    setStatus("success");
  }, () => { window.location.href = "/"; });

  useEffect(() => {
    const params = new URLSearchParams(window.location.search);
    const paid = params.get("paid");
    const fail = params.get("fail");
    const from = params.get("from");
    if (paid === "1") setStatus("success");
    else if (fail === "1") setStatus("fail");
    if (from) setFromUrl(decodeURIComponent(from));
  }, []);

  if (status === "pending") {
    return (
      <div className="flex min-h-screen flex-col items-center justify-center bg-[#f0f4f8] px-4">
        <div className="animate__animated animate__fadeInUp w-full max-w-md rounded-2xl bg-white p-10 text-center shadow-lg" style={{ animationFillMode: "both" }}>
          <div className="mx-auto mb-5 flex h-16 w-16 animate-spin items-center justify-center rounded-full border-4 border-sky-200 border-t-sky-500" />
          <h2 className="text-xl font-bold text-slate-800">支付结果确认中</h2>
          <p className="mt-3 text-sm text-slate-500">
            正在查询支付状态，请稍候…
            <br />
            （支付完成后将自动跳转，1 分钟内未支付将返回首页）
          </p>
        </div>
      </div>
    );
  }

  if (status === "success") {
    return (
      <SuccessWithRedirect />
    );
  }

  return (
    <div className="flex min-h-screen flex-col items-center justify-center bg-[#f0f4f8] px-4">
      <div className="animate__animated animate__zoomIn w-full max-w-md rounded-2xl bg-white p-10 text-center shadow-lg" style={{ animationFillMode: "both" }}>
        <div className="mx-auto mb-5 flex h-20 w-20 items-center justify-center rounded-full bg-amber-50 text-5xl">
          ⚠️
        </div>
        <h2 className="text-2xl font-bold text-slate-800">支付未完成</h2>
        <p className="mt-3 text-slate-500">支付已取消或未成功，请重试</p>
        <a
          href="/"
          onClick={(e) => { e.preventDefault(); window.location.href = "/"; }}
          className="mt-8 inline-flex items-center gap-2 rounded-full border-2 border-slate-300 px-8 py-3 font-semibold text-slate-700 transition-colors hover:border-slate-400 hover:bg-slate-50"
        >
          ← 返回首页
        </a>
      </div>
    </div>
  );
}