/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.boot.nacos.discovery.actuate.endpoint;

import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import com.alibaba.boot.nacos.common.PropertiesUtils;
import com.alibaba.boot.nacos.discovery.NacosDiscoveryConstants;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.nacos.api.naming.NamingService;
import com.alibaba.nacos.spring.factory.CacheableEventPublishingNacosServiceFactory;
import com.alibaba.nacos.spring.factory.NacosServiceFactory;
import com.alibaba.nacos.spring.util.NacosUtils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.context.ApplicationContext;

import static com.alibaba.nacos.spring.util.NacosBeanUtils.DISCOVERY_GLOBAL_NACOS_PROPERTIES_BEAN_NAME;

/**
 * Actuator {@link Endpoint} to expose Nacos Discovery Meta Data
 *
 * @author <a href="mailto:[email protected]">Jim</a>
 * @see Endpoint
 */
@Endpoint(id = NacosDiscoveryConstants.ENDPOINT_PREFIX)
public class NacosDiscoveryEndpoint {

	@Autowired
	private ApplicationContext applicationContext;

	private static final Integer PAGE_SIZE = 100;

	@ReadOperation
	public Map<String, Object> invoke() {
		Map<String, Object> result = new HashMap<>(8);

		result.put("nacosDiscoveryGlobalProperties",
				PropertiesUtils.extractSafeProperties(applicationContext.getBean(
						DISCOVERY_GLOBAL_NACOS_PROPERTIES_BEAN_NAME, Properties.class)));

		NacosServiceFactory nacosServiceFactory = CacheableEventPublishingNacosServiceFactory
				.getSingleton();

		JSONArray array = new JSONArray();
		for (NamingService namingService : nacosServiceFactory.getNamingServices()) {
			JSONObject jsonObject = new JSONObject();
			try {
				jsonObject.put("servicesOfServer",
						namingService.getServicesOfServer(0, PAGE_SIZE));
				jsonObject.put("subscribeServices", namingService.getSubscribeServices());
				array.add(jsonObject);
			}
			catch (Exception e) {
				jsonObject.put("serverStatus", namingService.getServerStatus() + ": "
						+ NacosUtils.SEPARATOR + e.getMessage());
			}
		}

		result.put("namingServersStatus", array);
		return result;
	}

}