/*
 * Copyright 2012-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 org.springframework.boot.opentelemetry.autoconfigure.logging;

import java.time.Duration;
import java.util.Collection;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.atomic.AtomicInteger;

import io.opentelemetry.context.Context;
import io.opentelemetry.sdk.common.CompletableResultCode;
import io.opentelemetry.sdk.logs.LogLimits;
import io.opentelemetry.sdk.logs.LogRecordProcessor;
import io.opentelemetry.sdk.logs.ReadWriteLogRecord;
import io.opentelemetry.sdk.logs.SdkLoggerProvider;
import io.opentelemetry.sdk.logs.SdkLoggerProviderBuilder;
import io.opentelemetry.sdk.logs.data.LogRecordData;
import io.opentelemetry.sdk.logs.export.BatchLogRecordProcessor;
import io.opentelemetry.sdk.logs.export.LogRecordExporter;
import org.junit.jupiter.api.Test;

import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigurations;
import org.springframework.boot.context.annotation.ImportCandidates;
import org.springframework.boot.opentelemetry.autoconfigure.OpenTelemetrySdkAutoConfiguration;
import org.springframework.boot.test.context.FilteredClassLoader;
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 OpenTelemetryLoggingAutoConfiguration}.
 *
 * @author Moritz Halbritter
 */
class OpenTelemetryLoggingAutoConfigurationTests {

	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
		.withConfiguration(AutoConfigurations.of(OpenTelemetrySdkAutoConfiguration.class,
				OpenTelemetryLoggingAutoConfiguration.class));

	@Test
	void registeredInAutoConfigurationImports() {
		assertThat(ImportCandidates.load(AutoConfiguration.class, null).getCandidates())
			.contains(OpenTelemetryLoggingAutoConfiguration.class.getName());
	}

	@Test
	void providesBeans() {
		this.contextRunner.run((context) -> {
			assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
			assertThat(context).hasSingleBean(SdkLoggerProvider.class);
			assertThat(context).hasSingleBean(LogLimits.class);
		});
	}

	@Test
	void whenOpenTelemetryIsDisabledDoesNotProvideBeans() {
		this.contextRunner.withPropertyValues("management.opentelemetry.enabled=false").run((context) -> {
			assertThat(context).doesNotHaveBean(BatchLogRecordProcessor.class);
			assertThat(context).doesNotHaveBean(SdkLoggerProvider.class);
			assertThat(context).doesNotHaveBean(LogLimits.class);
		});
	}

	@Test
	void whenOpenTelemetryLogsIsNotOnClasspathDoesNotProvideBeans() {
		this.contextRunner.withClassLoader(new FilteredClassLoader("io.opentelemetry.sdk.logs")).run((context) -> {
			assertThat(context).doesNotHaveBean(BatchLogRecordProcessor.class);
			assertThat(context).doesNotHaveBean(SdkLoggerProvider.class);
		});
	}

	@Test
	void whenHasUserSuppliedBeansDoesNotProvideBeans() {
		this.contextRunner.withUserConfiguration(UserConfiguration.class).run((context) -> {
			assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
			assertThat(context).hasBean("customBatchLogRecordProcessor").hasSingleBean(BatchLogRecordProcessor.class);
			assertThat(context).hasSingleBean(LogRecordProcessor.class);
			assertThat(context).hasBean("customSdkLoggerProvider").hasSingleBean(SdkLoggerProvider.class);
		});
	}

	@Test
	void whenHasMultipleLogRecordExportersProvidesBatchLogRecordProcessor() {
		this.contextRunner.withUserConfiguration(MultipleLogRecordExportersConfiguration.class).run((context) -> {
			assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
			assertThat(context.getBeansOfType(LogRecordExporter.class)).hasSize(2);
			assertThat(context).hasBean("customLogRecordExporter1");
			assertThat(context).hasBean("customLogRecordExporter2");
		});
	}

	@Test
	void whenHasMultipleLogRecordProcessorsStillProvidesBatchLogRecordProcessor() {
		this.contextRunner.withUserConfiguration(MultipleLogRecordProcessorsConfiguration.class).run((context) -> {
			assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
			assertThat(context).hasSingleBean(SdkLoggerProvider.class);
			assertThat(context.getBeansOfType(LogRecordProcessor.class)).hasSize(3);
			assertThat(context).hasBean("openTelemetryBatchLogRecordProcessor");
			assertThat(context).hasBean("customLogRecordProcessor1");
			assertThat(context).hasBean("customLogRecordProcessor2");
		});
	}

	@Test
	void whenHasMultipleSdkLoggerProviderBuilderCustomizersCallsCustomizeMethod() {
		this.contextRunner.withUserConfiguration(MultipleSdkLoggerProviderBuilderCustomizersConfiguration.class)
			.run((context) -> {
				assertThat(context).hasSingleBean(SdkLoggerProvider.class);
				assertThat(context.getBeansOfType(SdkLoggerProviderBuilderCustomizer.class)).hasSize(2);
				assertThat(context).hasBean("customSdkLoggerProviderBuilderCustomizer1");
				assertThat(context).hasBean("customSdkLoggerProviderBuilderCustomizer2");
				assertThat(context
					.getBean("customSdkLoggerProviderBuilderCustomizer1", NoopSdkLoggerProviderBuilderCustomizer.class)
					.called()).isEqualTo(1);
				assertThat(context
					.getBean("customSdkLoggerProviderBuilderCustomizer2", NoopSdkLoggerProviderBuilderCustomizer.class)
					.called()).isEqualTo(1);
			});
	}

	@Test
	void logLimitsShouldBeConfiguredWithCustomProperties() {
		this.contextRunner
			.withPropertyValues("management.opentelemetry.logging.limits.max-attribute-value-length=256",
					"management.opentelemetry.logging.limits.max-attributes=64")
			.run((context) -> {
				LogLimits logLimits = context.getBean(LogLimits.class);
				assertThat(logLimits.getMaxAttributeValueLength()).isEqualTo(256);
				assertThat(logLimits.getMaxNumberOfAttributes()).isEqualTo(64);
			});
	}

	@Test
	void shouldBackOffOnCustomLogLimitsBean() {
		this.contextRunner.withUserConfiguration(CustomLogLimitsConfiguration.class).run((context) -> {
			assertThat(context).hasSingleBean(LogLimits.class);
			assertThat(context).hasBean("customLogLimits");
		});
	}

	@Test
	void shouldConfigureBatchLogRecordProcessorWithProperties() {
		this.contextRunner
			.withPropertyValues("management.opentelemetry.logging.export.timeout=45s",
					"management.opentelemetry.logging.export.max-batch-size=256",
					"management.opentelemetry.logging.export.max-queue-size=4096",
					"management.opentelemetry.logging.export.schedule-delay=15s")
			.run((context) -> {
				assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
				BatchLogRecordProcessor processor = context.getBean(BatchLogRecordProcessor.class);
				assertThat(processor).extracting("worker")
					.hasFieldOrPropertyWithValue("exporterTimeoutNanos", Duration.ofSeconds(45).toNanos())
					.hasFieldOrPropertyWithValue("maxExportBatchSize", 256)
					.hasFieldOrPropertyWithValue("scheduleDelayNanos", Duration.ofSeconds(15).toNanos())
					.extracting("queue")
					.isInstanceOfSatisfying(ArrayBlockingQueue.class,
							(queue) -> assertThat(queue.remainingCapacity()).isEqualTo(4096));
			});
	}

	@Configuration(proxyBeanMethods = false)
	static class UserConfiguration {

		@Bean
		BatchLogRecordProcessor customBatchLogRecordProcessor() {
			return BatchLogRecordProcessor.builder(new NoopLogRecordExporter()).build();
		}

		@Bean
		SdkLoggerProvider customSdkLoggerProvider() {
			return SdkLoggerProvider.builder().build();
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class MultipleLogRecordExportersConfiguration {

		@Bean
		LogRecordExporter customLogRecordExporter1() {
			return new NoopLogRecordExporter();
		}

		@Bean
		LogRecordExporter customLogRecordExporter2() {
			return new NoopLogRecordExporter();
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class MultipleLogRecordProcessorsConfiguration {

		@Bean
		LogRecordProcessor customLogRecordProcessor1() {
			return new NoopLogRecordProcessor();
		}

		@Bean
		LogRecordProcessor customLogRecordProcessor2() {
			return new NoopLogRecordProcessor();
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class MultipleSdkLoggerProviderBuilderCustomizersConfiguration {

		@Bean
		SdkLoggerProviderBuilderCustomizer customSdkLoggerProviderBuilderCustomizer1() {
			return new NoopSdkLoggerProviderBuilderCustomizer();
		}

		@Bean
		SdkLoggerProviderBuilderCustomizer customSdkLoggerProviderBuilderCustomizer2() {
			return new NoopSdkLoggerProviderBuilderCustomizer();
		}

	}

	@Configuration(proxyBeanMethods = false)
	static class CustomLogLimitsConfiguration {

		@Bean
		LogLimits customLogLimits() {
			return LogLimits.builder().setMaxNumberOfAttributes(99).build();
		}

	}

	static class NoopLogRecordExporter implements LogRecordExporter {

		@Override
		public CompletableResultCode export(Collection<LogRecordData> logs) {
			return CompletableResultCode.ofSuccess();
		}

		@Override
		public CompletableResultCode flush() {
			return CompletableResultCode.ofSuccess();
		}

		@Override
		public CompletableResultCode shutdown() {
			return CompletableResultCode.ofSuccess();
		}

	}

	static class NoopLogRecordProcessor implements LogRecordProcessor {

		@Override
		public void onEmit(Context context, ReadWriteLogRecord logRecord) {
		}

	}

	static class NoopSdkLoggerProviderBuilderCustomizer implements SdkLoggerProviderBuilderCustomizer {

		final AtomicInteger called = new AtomicInteger(0);

		@Override
		public void customize(SdkLoggerProviderBuilder builder) {
			this.called.incrementAndGet();
		}

		int called() {
			return this.called.get();
		}

	}

}
