/*
 * Copyright 2013-2019 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 org.springframework.cloud.sleuth.zipkin2.sender;

import org.junit.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.cloud.sleuth.zipkin2.ZipkinLoadBalancer;
import org.springframework.cloud.sleuth.zipkin2.ZipkinProperties;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * @author liaochuntao
 */
public class ZipkinRestTemplateSenderConfigurationTest {

	@Test
	public void disableZipkinDiscoveryClient() {
		ConfigurableApplicationContext ctxt = new SpringApplication(
				ZipkinRestTemplateSenderConfigurationTest.MyDiscoveryClientZipkinUrlExtractorConfiguration.class,
				ZipkinProperties.class)
						.run("--spring.zipkin.discovery-client-enabled=false");
		assertThat(ctxt.getBean(ZipkinLoadBalancer.class))
				.isInstanceOf(NoOpZipkinLoadBalancer.class);
		ctxt.close();
	}

	@Test
	public void enableZipkinDiscoveryClient() {
		ConfigurableApplicationContext ctxt = new SpringApplication(
				ZipkinRestTemplateSenderConfigurationTest.MyDiscoveryClientZipkinUrlExtractorConfiguration.class,
				ZipkinProperties.class)
						.run("--spring.zipkin.discovery-client-enabled=true");
		assertThat(ctxt.getBean(ZipkinLoadBalancer.class))
				.isInstanceOf(LoadBalancerClientZipkinLoadBalancer.class);
		ctxt.close();
	}

	@Configuration
	@ConditionalOnClass(LoadBalancerClient.class)
	static class MyDiscoveryClientZipkinUrlExtractorConfiguration {

		@Configuration
		@ConditionalOnProperty(value = "spring.zipkin.discovery-client-enabled",
				havingValue = "true", matchIfMissing = true)
		static class ZipkinClientLoadBalancedConfiguration {

			@Autowired(required = false)
			LoadBalancerClient client;

			@Bean
			@ConditionalOnMissingBean
			ZipkinLoadBalancer loadBalancerClientZipkinLoadBalancer(
					ZipkinProperties zipkinProperties) {
				return new LoadBalancerClientZipkinLoadBalancer(this.client,
						zipkinProperties);
			}

		}

		@Configuration
		@ConditionalOnProperty(value = "spring.zipkin.discovery-client-enabled",
				havingValue = "false")
		static class ZipkinClientNoOpConfiguration {

			@Bean
			@ConditionalOnMissingBean
			ZipkinLoadBalancer noOpLoadBalancer(final ZipkinProperties zipkinProperties) {
				return new NoOpZipkinLoadBalancer(zipkinProperties);
			}

		}

	}

}
