/*
 * Copyright 2012-2018 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
 *
 *      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 org.springframework.boot.actuate.autoconfigure.metrics.export.simple;

import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.simple.SimpleConfig;
import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
import org.junit.Test;

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 org.springframework.context.annotation.Import;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.mock;

/**
 *
 * Tests for {@link SimpleMetricsExportAutoConfiguration}.
 *
 * @author Andy Wilkinson
 */
public class SimplMetricsExportAutoConfigurationTests {

	private final ApplicationContextRunner runner = new ApplicationContextRunner()
			.withConfiguration(
					AutoConfigurations.of(SimpleMetricsExportAutoConfiguration.class));

	@Test
	public void autoConfiguresConfigAndMeterRegistry() {
		this.runner.withUserConfiguration(BaseConfiguration.class)
				.run((context) -> assertThat(context)
						.hasSingleBean(SimpleMeterRegistry.class)
						.hasSingleBean(Clock.class).hasSingleBean(SimpleConfig.class));
	}

	@Test
	public void allowsConfigToBeCustomized() {
		this.runner.withUserConfiguration(CustomConfigConfiguration.class)
				.run((context) -> assertThat(context).hasSingleBean(SimpleConfig.class)
						.hasBean("customConfig"));
	}

	@Test
	public void backsOffEntirelyWithCustomMeterRegistry() {
		this.runner.withUserConfiguration(CustomRegistryConfiguration.class)
				.run((context) -> assertThat(context).hasSingleBean(MeterRegistry.class)
						.hasBean("customRegistry").doesNotHaveBean(SimpleConfig.class));
	}

	@Configuration
	static class BaseConfiguration {

		@Bean
		public Clock clock() {
			return Clock.SYSTEM;
		}

	}

	@Configuration
	@Import(BaseConfiguration.class)
	static class CustomConfigConfiguration {

		@Bean
		public SimpleConfig customConfig() {
			return new SimpleConfig() {

				@Override
				public String get(String k) {
					return null;
				}

			};
		}

	}

	@Configuration
	@Import(BaseConfiguration.class)
	static class CustomRegistryConfiguration {

		@Bean
		public MeterRegistry customRegistry() {
			return mock(MeterRegistry.class);
		}

	}

}
