content: /*
   * Copyright 2024-2025 the original author or authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alibaba.cloud.ai.a2a.registry.nacos.discovery;
  
  import com.alibaba.cloud.ai.a2a.registry.nacos.utils.AgentCardConverterUtil;
  import com.alibaba.cloud.ai.graph.agent.a2a.AgentCardProvider;
  import com.alibaba.cloud.ai.graph.agent.a2a.AgentCardWrapper;
  import com.alibaba.nacos.api.ai.A2aService;
  import com.alibaba.nacos.api.ai.listener.AbstractNacosAgentCardListener;
  import com.alibaba.nacos.api.ai.listener.NacosAgentCardEvent;
  import com.alibaba.nacos.api.ai.model.a2a.AgentCard;
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.exception.runtime.NacosRuntimeException;
  import com.alibaba.nacos.common.utils.JacksonUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Implementation of {@link AgentCardProvider} for getting agent card from nacos a2a
   * registry.
   *
   * @author xiweng.yy
   */
  public class NacosAgentCardProvider implements AgentCardProvider {
  
  	private static final Logger LOGGER = LoggerFactory.getLogger(NacosAgentCardProvider.class);
  
  	private final A2aService a2aService;
  
  	private AgentCardWrapper agentCard;
  
  	public NacosAgentCardProvider(A2aService a2aService) {
  		this.a2aService = a2aService;
  	}
  
  	@Override
  	public AgentCardWrapper getAgentCard() {
  		if (null == agentCard) {
  			throw new IllegalStateException("Please use getAgentCard(agentName) first.");
  		}
  		return agentCard;
  	}
  
  	@Override
  	public AgentCardWrapper getAgentCard(String agentName) {
  		try {
  			AgentCard nacosAgentCard = a2aService.getAgentCard(agentName);
  			agentCard = new NacosAgentCardWrapper(AgentCardConverterUtil.convertToA2aAgentCard(nacosAgentCard));
  			a2aService.subscribeAgentCard(agentName, new AbstractNacosAgentCardListener() {
  				@Override
  				public void onEvent(NacosAgentCardEvent event) {
  					AgentCard newAgentCard = event.getAgentCard();
  					if (LOGGER.isDebugEnabled()) {
  						LOGGER.debug("Received new Agent Card: {}", JacksonUtils.toJson(newAgentCard));
  					}
  					agentCard.setAgentCard(AgentCardConverterUtil.convertToA2aAgentCard(newAgentCard));
  				}
  			});
  			return agentCard;
  		}
  		catch (NacosException e) {
  			throw new NacosRuntimeException(e.getErrCode(), e.getErrMsg());
  		}
  	}
  
  	@Override
  	public boolean supportGetAgentCardByName() {
  		return true;
  	}
  
  }
  