// ============ 支付结果轮询 ============

/**
 * 查询微信预支付状态入口
 * data == 1 支付处理中（继续轮询）
 * data == 2 支付成功
 * 其他值视为失败
 */
gePrePayStatus: function (prePayId) {
  const that = this;
  this._prePayId = prePayId;
  this.queryPrePayStatus(prePayId);
},

/**
 * 单次状态查询，根据结果决定是否继续轮询
 */
queryPrePayStatus: function (prePayId) {
  const that = this;

  service.gePrePayStatus({
    prePayId: prePayId || that._prePayId,
    callback: (resp, error) => {
      // 先释放"查询中"锁，保证定时器下一轮能继续发请求
      that._prePayQuerying = false;

      if (error) {
        that.stopPrePayTimer();
        wx.showToast({
          title: error,
          duration: 3000,
          icon: 'none',
        });
        return;
      }

      const data = resp.data;
      if (data == 1) {
        // 支付处理中 → 启动/继续轮询
        that.startPrePayTimer(that._prePayId);
      } else if (data == 2) {
        // 支付成功
        that.stopPrePayTimer();
        that.triggerEvent('onBalanceRecharge', null);
      } else {
        // 其他状态都视为失败
        that.stopPrePayTimer();
        wx.showToast({
          title: '启动失败',
          duration: 3000,
          icon: 'none',
        });
      }
    }
  });
},

/**
 * 启动轮询定时器：每 3 秒查一次，已有定时器则复用
 */
startPrePayTimer: function (prePayId) {
  const that = this;
  if (this._prePayTimer) return;

  this._prePayId = prePayId;
  this._prePayTimer = setInterval(function () {
    if (that._prePayQuerying) return;   // 上一次未返回，跳过本轮
    that._prePayQuerying = true;
    that.queryPrePayStatus(that._prePayId);
  }, 3000);
},

/**
 * 停止轮询定时器
 */
stopPrePayTimer: function () {
  if (this._prePayTimer) {
    clearInterval(this._prePayTimer);
    this._prePayTimer = null;
  }
  this._prePayQuerying = false;
  this._prePayId = null;
},