export class UECommunicationService {
    constructor(stream) {
      this.s = stream;
      this.pendingMessages = {};
      this.ueCommunicationInitialized = false;
    }
  
    // 初始化监听器
    initUeCommunication() {
      if (!this.ueCommunicationInitialized) {
        this.s.addResponseEventListener("ue-response", this.myHandleResponseFunction.bind(this));
        this.ueCommunicationInitialized = true;
      }
    }
  
    // 发送消息到UE
    sendToUE(message) {
      return new Promise((resolve, reject) => {
        const messageId = `msg_${Date.now()}_${Math.floor(Math.random() * 1000)}`;
        const ueMessage = {
          id: messageId,
          type: message.type || 'default',
          data: JSON.stringify(message.data) || {},
        };
  
        this.pendingMessages[messageId] = { resolve, reject };
  
        const timeoutId = setTimeout(() => {
          if (this.pendingMessages[messageId]) {
            delete this.pendingMessages[messageId];
            reject(new Error('Request timeout'));
          }
        }, message.timeout || 5000); // 默认5秒超时
  
        this.pendingMessages[messageId].timeoutId = timeoutId;
  
        try {
          this.s.emitUIInteraction(ueMessage);
        } catch (error) {
          clearTimeout(timeoutId);
          delete this.pendingMessages[messageId];
          reject(error);
        }
      });
    }
  
    // 处理响应消息
    myHandleResponseFunction(response) {
      try {
        const responseObj = JSON.parse(response);
  
        if (responseObj.id && this.pendingMessages[responseObj.id]) {
          const { resolve, reject, timeoutId } = this.pendingMessages[responseObj.id];
          clearTimeout(timeoutId);
          delete this.pendingMessages[responseObj.id];
  
          if (responseObj.status === 'success') {
            resolve(responseObj.data);
          } else {
            reject(new Error(responseObj.error || 'Unknown error'));
          }
        } else {
          // 非响应消息，可能是推送通知
          console.log('Received message from UE:', responseObj);
        }
      } catch (e) {
        console.error('Failed to parse UE response:', e);
      }
    }
  }