/*
 * Copyright 2013-present 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.examples.example;

import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

import com.alibaba.cloud.commons.lang.StringUtils;
import com.alibaba.cloud.nacos.NacosConfigManager;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.listener.Listener;
import com.alibaba.nacos.api.exception.NacosException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * Example of docking with Nacos interface.
 *
 * @author lixiaoshuang
 */
@RestController
@RequestMapping("/nacos")
public class DockingInterfaceExample {

	Logger logger = LoggerFactory.getLogger(DockingInterfaceExample.class);

	/**
	 * Nacos group.
	 */
	public static final String DEFAULT_GROUP = "DEFAULT_GROUP";

	@Autowired
	private NacosConfigManager nacosConfigManager;

	/**
	 * Get configuration information.
	 *
	 * @param dataId dataId
	 * @param group group
	 * @return config
	 */
	@RequestMapping("/getConfig")
	public String getConfig(@RequestParam("dataId") String dataId,
			@RequestParam(value = "group", required = false) String group)
			throws NacosException {
		if (StringUtils.isEmpty(group)) {
			group = DEFAULT_GROUP;
		}
		ConfigService configService = nacosConfigManager.getConfigService();
		return configService.getConfig(dataId, group, 2000);
	}

	/**
	 * Publish configuration.
	 *
	 * @param dataId dataId
	 * @param group group
	 * @param content content
	 * @return boolean
	 */
	@RequestMapping("/publishConfig")
	public boolean publishConfig(@RequestParam("dataId") String dataId,
			@RequestParam(value = "group", required = false) String group,
			@RequestParam("content") String content) throws NacosException {
		if (StringUtils.isEmpty(group)) {
			group = DEFAULT_GROUP;
		}
		ConfigService configService = nacosConfigManager.getConfigService();
		return configService.publishConfig(dataId, group, content);
	}

	/**
	 * Delete configuration.
	 *
	 * @param dataId dataId
	 * @param group group
	 * @return boolean
	 */
	@RequestMapping("/removeConfig")
	public boolean removeConfig(@RequestParam("dataId") String dataId,
			@RequestParam(value = "group", required = false) String group)
			throws NacosException {
		if (StringUtils.isEmpty(group)) {
			group = DEFAULT_GROUP;
		}
		ConfigService configService = nacosConfigManager.getConfigService();
		return configService.removeConfig(dataId, group);
	}

	/**
	 * Add listener configuration information.
	 *
	 * @param dataId dataId
	 * @param group group
	 */
	@RequestMapping("/listener")
	public String listenerConfig(@RequestParam("dataId") String dataId,
			@RequestParam(value = "group", required = false) String group)
			throws NacosException {
		if (StringUtils.isEmpty(group)) {
			group = DEFAULT_GROUP;
		}
		ConfigService configService = nacosConfigManager.getConfigService();
		configService.addListener(dataId, group, new Listener() {
			@Override
			public Executor getExecutor() {
				return Executors.newSingleThreadExecutor();
			}

			@Override
			public void receiveConfigInfo(String configInfo) {
				logger.info("[Listen for configuration changes]:{}", configInfo);
			}
		});
		return "Add Lister successfully!";
	}
}
