/**
 * 支付状态轮询
 * - 手机 H5：传入 orderId（点击支付后由 state 传入），直接轮询，不依赖 sessionStorage/cookie
 * - PC/微信：不传 orderId，使用 cookie 轮询（兼容旧逻辑）
 */
import { useEffect, useRef, useState } from "react";

const COOKIE_NAME = "nomadvip_pay_order";
const POLL_INTERVAL = 1000;
const MAX_POLLS = 160; // ~5 分钟
const MAX_AGE_MS = 15 * 60 * 1000;

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 clearCookie(name: string): void {
  if (typeof document === "undefined") return;
  document.cookie = `${name}=; path=/; max-age=0`;
}

function parsePayOrderCookie(raw: string | null): [string | null, boolean] {
  if (!raw?.trim()) return [null, false];
  const parts = raw.split("|");
  const orderId = parts[0]?.trim() || raw.trim();
  const ts = parts[1] ? parseInt(parts[1], 10) : NaN;
  if (!orderId) return [null, false];
  if (Number.isNaN(ts)) return [orderId, false];
  if (Date.now() - ts > MAX_AGE_MS) return [orderId, false];
  return [orderId, true];
}

export function usePayStatusPoll(
  onPaid: (orderId?: string) => void,
  onTimeout?: () => void,
  /** 手机 H5：点击支付后传入的 orderId，直接轮询，不依赖 sessionStorage/cookie */
  orderIdFromState?: string | null
): boolean {
  const [polling, setPolling] = useState(false);
  const onPaidRef = useRef(onPaid);
  const onTimeoutRef = useRef(onTimeout);
  onPaidRef.current = onPaid;
  onTimeoutRef.current = onTimeout;

  useEffect(() => {
    const orderId =
      orderIdFromState !== undefined
        ? (orderIdFromState?.trim() || null)
        : (() => {
            const raw = getCookie(COOKIE_NAME);
            const [oid, valid] = parsePayOrderCookie(raw);
            return valid ? oid : null;
          })();
    if (!orderId) {
      if (orderIdFromState === undefined && getCookie(COOKIE_NAME)) clearCookie(COOKIE_NAME);
      return;
    }

    setPolling(true);
    let count = 0;
    const timer = setInterval(async () => {
      count++;
      if (count > MAX_POLLS) {
        clearInterval(timer);
        clearCookie(COOKIE_NAME);
        setPolling(false);
        onTimeoutRef.current?.();
        return;
      }
      try {
        const res = await fetch(`/api/pay/status?order_id=${encodeURIComponent(orderId)}`);
        const data = await res.json();
        if (data?.ok && data?.paid) {
          clearInterval(timer);
          clearCookie(COOKIE_NAME);
          setPolling(false);
          onPaidRef.current(orderId);
        }
      } catch {
        // 继续轮询
      }
    }, POLL_INTERVAL);

    return () => clearInterval(timer);
  }, [orderIdFromState]);

  return polling;
}