/*
 * Copyright 2012-2019 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.boot.actuate.autoconfigure.metrics;

import io.micrometer.core.instrument.binder.system.FileDescriptorMetrics;
import io.micrometer.core.instrument.binder.system.ProcessorMetrics;
import io.micrometer.core.instrument.binder.system.UptimeMetrics;
import org.junit.jupiter.api.Test;

import org.springframework.boot.actuate.autoconfigure.metrics.test.MetricsRun;
import org.springframework.boot.autoconfigure.AutoConfigurations;
import org.springframework.boot.test.context.runner.ApplicationContextRunner;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

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

/**
 * Tests for {@link SystemMetricsAutoConfiguration}.
 *
 * @author Andy Wilkinson
 * @author Stephane Nicoll
 */
public class SystemMetricsAutoConfigurationTests {

	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
			.with(MetricsRun.simple()).withConfiguration(
					AutoConfigurations.of(SystemMetricsAutoConfiguration.class));

	@Test
	public void autoConfiguresUptimeMetrics() {
		this.contextRunner
				.run((context) -> assertThat(context).hasSingleBean(UptimeMetrics.class));
	}

	@Test
	public void allowsCustomUptimeMetricsToBeUsed() {
		this.contextRunner.withUserConfiguration(CustomUptimeMetricsConfiguration.class)
				.run((context) -> assertThat(context).hasSingleBean(UptimeMetrics.class)
						.hasBean("customUptimeMetrics"));
	}

	@Test
	public void autoConfiguresProcessorMetrics() {
		this.contextRunner.run(
				(context) -> assertThat(context).hasSingleBean(ProcessorMetrics.class));
	}

	@Test
	public void allowsCustomProcessorMetricsToBeUsed() {
		this.contextRunner
				.withUserConfiguration(CustomProcessorMetricsConfiguration.class)
				.run((context) -> assertThat(context)
						.hasSingleBean(ProcessorMetrics.class)
						.hasBean("customProcessorMetrics"));
	}

	@Test
	public void autoConfiguresFileDescriptorMetrics() {
		this.contextRunner.run((context) -> assertThat(context)
				.hasSingleBean(FileDescriptorMetrics.class));
	}

	@Test
	public void allowsCustomFileDescriptorMetricsToBeUsed() {
		this.contextRunner
				.withUserConfiguration(CustomFileDescriptorMetricsConfiguration.class)
				.run((context) -> assertThat(context)
						.hasSingleBean(FileDescriptorMetrics.class)
						.hasBean("customFileDescriptorMetrics"));
	}

	@Configuration(proxyBeanMethods = false)
	static class CustomUptimeMetricsConfiguration {

		@Bean
		public UptimeMetrics customUptimeMetrics() {
			return new UptimeMetrics();
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class CustomProcessorMetricsConfiguration {

		@Bean
		public ProcessorMetrics customProcessorMetrics() {
			return new ProcessorMetrics();
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class CustomFileDescriptorMetricsConfiguration {

		@Bean
		public FileDescriptorMetrics customFileDescriptorMetrics() {
			return new FileDescriptorMetrics();
		}

	}

}
