/*
 * Copyright 2013-2018 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.nacos.registry;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;
import java.util.Properties;

import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
import com.alibaba.cloud.nacos.discovery.NacosDiscoveryClientConfiguration;
import com.alibaba.nacos.api.NacosFactory;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.api.support.MethodProxy;
import org.powermock.core.classloader.annotations.PowerMockIgnore;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.powermock.modules.junit4.PowerMockRunnerDelegate;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.cloud.client.serviceregistry.AutoServiceRegistrationConfiguration;
import org.springframework.cloud.commons.util.InetUtils;
import org.springframework.context.annotation.Configuration;
import org.springframework.test.context.junit4.SpringRunner;

import static org.assertj.core.api.Assertions.assertThat;
import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;

/**
 * @author xiaojing
 */

@RunWith(PowerMockRunner.class)
@PowerMockIgnore("javax.management.*")
@PowerMockRunnerDelegate(SpringRunner.class)
@PrepareForTest({ NacosFactory.class })
@SpringBootTest(
		classes = NacosAutoServiceRegistrationIpNetworkInterfaceTests.TestConfig.class,
		properties = { "spring.application.name=myTestService1",
				"spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848" },
		webEnvironment = RANDOM_PORT)
public class NacosAutoServiceRegistrationIpNetworkInterfaceTests {

	@Autowired
	private NacosRegistration registration;

	@Autowired
	private NacosAutoServiceRegistration nacosAutoServiceRegistration;

	@Autowired
	private NacosDiscoveryProperties properties;

	@Autowired
	private InetUtils inetUtils;

	static {
		try {
			Method method = PowerMockito.method(NacosFactory.class, "createNamingService",
					Properties.class);
			MethodProxy.proxy(method, new InvocationHandler() {
				@Override
				public Object invoke(Object proxy, Method method, Object[] args)
						throws Throwable {
					return new MockNamingService();
				}
			});
		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}

	@Test
	public void contextLoads() throws Exception {
		assertThat(registration).isNotNull();
		assertThat(properties).isNotNull();
		assertThat(nacosAutoServiceRegistration).isNotNull();

		checkoutNacosDiscoveryServiceIP();
	}

	private void checkoutNacosDiscoveryServiceIP() {
		assertThat(registration.getHost())
				.isEqualTo(getIPFromNetworkInterface(TestConfig.netWorkInterfaceName));
	}

	private String getIPFromNetworkInterface(String networkInterface) {

		if (!TestConfig.hasValidNetworkInterface) {
			return inetUtils.findFirstNonLoopbackHostInfo().getIpAddress();
		}

		try {
			NetworkInterface netInterface = NetworkInterface.getByName(networkInterface);

			Enumeration<InetAddress> inetAddress = netInterface.getInetAddresses();
			while (inetAddress.hasMoreElements()) {
				InetAddress currentAddress = inetAddress.nextElement();
				if (currentAddress instanceof Inet4Address
						&& !currentAddress.isLoopbackAddress()) {
					return currentAddress.getHostAddress();
				}
			}
			return networkInterface;
		}
		catch (Exception e) {
			return networkInterface;
		}
	}

	@Configuration
	@EnableAutoConfiguration
	@ImportAutoConfiguration({ AutoServiceRegistrationConfiguration.class,
			NacosDiscoveryClientConfiguration.class,
			NacosServiceRegistryAutoConfiguration.class })
	public static class TestConfig {

		static boolean hasValidNetworkInterface = false;
		static String netWorkInterfaceName;

		static {

			try {
				Enumeration<NetworkInterface> enumeration = NetworkInterface
						.getNetworkInterfaces();
				while (enumeration.hasMoreElements() && !hasValidNetworkInterface) {
					NetworkInterface networkInterface = enumeration.nextElement();
					Enumeration<InetAddress> inetAddress = networkInterface
							.getInetAddresses();
					while (inetAddress.hasMoreElements()) {
						InetAddress currentAddress = inetAddress.nextElement();
						if (currentAddress instanceof Inet4Address
								&& !currentAddress.isLoopbackAddress()) {
							hasValidNetworkInterface = true;
							netWorkInterfaceName = networkInterface.getName();
							System.setProperty(
									"spring.cloud.nacos.discovery.network-interface",
									networkInterface.getName());
							break;
						}
					}
				}

			}
			catch (Exception e) {

			}
		}

	}

}