/**
 * 游戏端 SDK
 * 注入到游戏 iframe 内，封装常用业务 API
 */
(function () {
  const pendingRequests = new Map();
  let logoutCallback = null;

  // 生成唯一 ID
  function generateId() {
    return Math.random().toString(36).substring(2, 15) + Date.now().toString(36);
  }

  // 监听来自父级的消息
  window.addEventListener('message', (event) => {
    try {
      const message = typeof event.data === 'string' ? JSON.parse(event.data) : event.data;

      if (message && message.requestId) {
        console.log('[SDK] Received message from parent:', message);
        const request = pendingRequests.get(message.requestId);

        if (request) {
          if (message.type.endsWith('_SUCCESS')) {
            request.resolve(message.data);
          } else if (message.type.endsWith('_FAIL') || message.type.endsWith('_CANCEL')) {
            request.reject(new Error(message.data?.message || 'Operation failed or cancelled'));
          } else {
            // 某些情况下可能只是通用回复
            request.resolve(message.data);
          }
          pendingRequests.delete(message.requestId);
        }
      }
    } catch (error) {
      // 解析失败忽略
    }
  });

  // 基础发送方法，返回 Promise
  function sendRequest(type, data = {}) {
    return new Promise((resolve, reject) => {
      const requestId = generateId();
      pendingRequests.set(requestId, { resolve, reject });

      const message = { type, data, requestId };
      console.log('[SDK] Requesting parent:', message);
      window.parent.postMessage(JSON.stringify(message), '*');
    });
  }

  // 暴露全局对象 GameSDK
  window.GameSDK = {

    /**
     * 退出登录
     */
    logout: function () {
      return sendRequest('LOGOUT_REQUEST');
    },

    /**
     * 监听退出登录回调
     * @param {Function} callback 
     */
    onLogout: function () {
      return sendRequest('ONLOGOUT');
    },

    /**
     * 调用登录
     * @returns {Promise<{token: string, userId: string, username: string}>}
     */
    login: function () {
      return sendRequest('LOGIN_REQUEST');
    },

    /**
     * 调起支付
     * @param {Object} orderInfo 订单信息
     * @param {string} orderInfo.productId 商品ID
     * @param {string} orderInfo.productName 商品名称
     * @param {number} orderInfo.amount 支付金额
     * @returns {Promise<{orderId: string, status: string}>}
     */
    pay: function (orderInfo) {
      return sendRequest('PAY_REQUEST', orderInfo);
    },

    /**
     * 数据上报
     * @param {Object} reportData 上报数据
     * @param {string} reportData.action 行为类型
     * @param {string} reportData.payload 上报内容
     * @returns {Promise<{success: boolean}>}
     */
    report: function (reportData) {
      return sendRequest('REPORT_REQUEST', reportData);
    },

    /**
     * 初始化
     * @returns {Promise<{success: boolean}>}
     */
    init: function (initData) {
      return sendRequest('INIT_REQUEST', initData);
    }
  };
})();