/*
 * 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.actuate.autoconfigure.logging.otlp;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.time.Instant;
import java.util.concurrent.TimeUnit;

import io.opentelemetry.api.logs.Severity;
import io.opentelemetry.sdk.logs.SdkLoggerProvider;
import okhttp3.mockwebserver.MockResponse;
import okhttp3.mockwebserver.MockWebServer;
import okhttp3.mockwebserver.RecordedRequest;
import okio.Buffer;
import okio.GzipSource;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.springframework.boot.actuate.autoconfigure.logging.OpenTelemetryLoggingAutoConfiguration;
import org.springframework.boot.actuate.autoconfigure.opentelemetry.OpenTelemetryAutoConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigurations;
import org.springframework.boot.test.context.runner.ApplicationContextRunner;
import org.springframework.context.ApplicationContext;

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

/**
 * Integration tests for {@link OtlpLoggingAutoConfiguration}.
 *
 * @author Toshiaki Maki
 */
class OtlpLoggingAutoConfigurationIntegrationTests {

	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
		.withPropertyValues("spring.application.name=otlp-logs-test",
				"management.otlp.logging.headers.Authorization=Bearer my-token")
		.withConfiguration(AutoConfigurations.of(OpenTelemetryAutoConfiguration.class,
				OpenTelemetryLoggingAutoConfiguration.class, OtlpLoggingAutoConfiguration.class));

	private final MockWebServer mockWebServer = new MockWebServer();

	@BeforeEach
	void setUp() throws IOException {
		this.mockWebServer.start();
	}

	@AfterEach
	void tearDown() throws IOException {
		this.mockWebServer.close();
	}

	@Test
	void httpLogRecordExporterShouldUseProtobufAndNoCompressionByDefault() {
		this.mockWebServer.enqueue(new MockResponse());
		this.contextRunner
			.withPropertyValues("management.otlp.logging.endpoint=http://localhost:%d/v1/logs"
				.formatted(this.mockWebServer.getPort()))
			.run((context) -> {
				logMessage(context);
				RecordedRequest request = this.mockWebServer.takeRequest(10, TimeUnit.SECONDS);
				assertThat(request).isNotNull();
				assertThat(request.getRequestLine()).contains("/v1/logs");
				assertThat(request.getHeader("Content-Type")).isEqualTo("application/x-protobuf");
				assertThat(request.getHeader("Content-Encoding")).isNull();
				assertThat(request.getBodySize()).isPositive();
				try (Buffer body = request.getBody()) {
					assertLogMessage(body);
				}
			});
	}

	@Test
	void httpLogRecordExporterCanBeConfiguredToUseGzipCompression() {
		this.mockWebServer.enqueue(new MockResponse());
		this.contextRunner
			.withPropertyValues("management.otlp.logging.endpoint=http://localhost:%d/v1/logs"
				.formatted(this.mockWebServer.getPort()), "management.otlp.logging.compression=gzip")
			.run((context) -> {
				logMessage(context);
				RecordedRequest request = this.mockWebServer.takeRequest(10, TimeUnit.SECONDS);
				assertThat(request).isNotNull();
				assertThat(request.getRequestLine()).contains("/v1/logs");
				assertThat(request.getHeader("Content-Type")).isEqualTo("application/x-protobuf");
				assertThat(request.getHeader("Content-Encoding")).isEqualTo("gzip");
				assertThat(request.getBodySize()).isPositive();
				try (Buffer uncompressed = new Buffer(); Buffer body = request.getBody()) {
					uncompressed.writeAll(new GzipSource(body));
					assertLogMessage(uncompressed);
				}
			});
	}

	private static void logMessage(ApplicationContext context) {
		SdkLoggerProvider loggerProvider = context.getBean(SdkLoggerProvider.class);
		loggerProvider.get("test")
			.logRecordBuilder()
			.setSeverity(Severity.INFO)
			.setSeverityText("INFO")
			.setBody("Hello")
			.setTimestamp(Instant.now())
			.emit();
	}

	private static void assertLogMessage(Buffer body) {
		String string = body.readString(StandardCharsets.UTF_8);
		assertThat(string).contains("otlp-logs-test");
		assertThat(string).contains("test");
		assertThat(string).contains("INFO");
		assertThat(string).contains("Hello");
	}

}
