/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.contrib.jmxmetrics;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.entry;
import static org.awaitility.Awaitility.await;
import static org.testcontainers.Testcontainers.exposeHostPorts;

import com.linecorp.armeria.server.ServerBuilder;
import com.linecorp.armeria.server.grpc.GrpcService;
import com.linecorp.armeria.testing.junit5.server.ServerExtension;
import io.grpc.stub.StreamObserver;
import io.opentelemetry.proto.collector.metrics.v1.ExportMetricsServiceRequest;
import io.opentelemetry.proto.collector.metrics.v1.ExportMetricsServiceResponse;
import io.opentelemetry.proto.collector.metrics.v1.MetricsServiceGrpc;
import io.opentelemetry.proto.common.v1.KeyValue;
import io.opentelemetry.proto.metrics.v1.Metric;
import io.opentelemetry.proto.metrics.v1.NumberDataPoint;
import io.opentelemetry.proto.metrics.v1.ResourceMetrics;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import org.assertj.core.api.MapAssert;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.TestInstance;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.testcontainers.containers.GenericContainer;
import org.testcontainers.containers.Network;
import org.testcontainers.containers.output.Slf4jLogConsumer;
import org.testcontainers.containers.wait.strategy.Wait;
import org.testcontainers.junit.jupiter.Testcontainers;
import org.testcontainers.utility.MountableFile;

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
@Testcontainers(disabledWithoutDocker = true)
public abstract class AbstractIntegrationTest {

  private static final Logger logger = LoggerFactory.getLogger(AbstractIntegrationTest.class);

  private final boolean configFromStdin;
  private final String configName;

  private GenericContainer<?> scraper;
  private OtlpGrpcServer otlpServer;

  protected AbstractIntegrationTest(boolean configFromStdin, String configName) {
    this.configFromStdin = configFromStdin;
    this.configName = configName;
  }

  @BeforeAll
  void beforeAll() {
    otlpServer = new OtlpGrpcServer();
    otlpServer.start();
    exposeHostPorts(otlpServer.httpPort());
    String otlpEndpoint = "http://host.testcontainers.internal:" + otlpServer.httpPort();

    scraper = buildScraper(otlpEndpoint);
    scraper.start();
  }

  @AfterAll
  // No need to block other tests waiting on return.
  @SuppressWarnings("FutureReturnValueIgnored")
  void afterAll() {
    otlpServer.stop();
    scraper.stop();
  }

  @BeforeEach
  void beforeEach() {
    otlpServer.reset();
  }

  protected GenericContainer<?> buildScraper(String otlpEndpoint) {
    String scraperJarPath = System.getProperty("shadow.jar.path");

    List<String> scraperCommand = new ArrayList<>();
    scraperCommand.add("java");
    scraperCommand.add("-cp");
    scraperCommand.add("/app/OpenTelemetryJava.jar");
    scraperCommand.add("-Dotel.jmx.username=cassandra");
    scraperCommand.add("-Dotel.jmx.password=cassandra");
    scraperCommand.add("-Dotel.exporter.otlp.endpoint=" + otlpEndpoint);
    scraperCommand.add("io.opentelemetry.contrib.jmxmetrics.JmxMetrics");
    scraperCommand.add("-config");

    if (configFromStdin) {
      String cmd = String.join(" ", scraperCommand);
      scraperCommand = Arrays.asList("sh", "-c", "cat /app/" + configName + " | " + cmd + " -");
    } else {
      scraperCommand.add("/app/" + configName);
    }

    return new GenericContainer<>("openjdk:8u272-jre-slim")
        .withNetwork(Network.SHARED)
        .withCopyFileToContainer(
            MountableFile.forHostPath(scraperJarPath), "/app/OpenTelemetryJava.jar")
        .withCopyFileToContainer(
            MountableFile.forClasspathResource("script.groovy"), "/app/script.groovy")
        .withCopyFileToContainer(
            MountableFile.forClasspathResource(configName), "/app/" + configName)
        .withCommand(scraperCommand.toArray(new String[0]))
        .withLogConsumer(new Slf4jLogConsumer(logger))
        .withStartupTimeout(Duration.ofMinutes(2))
        .waitingFor(Wait.forLogMessage(".*Started GroovyRunner.*", 1));
  }

  protected static GenericContainer<?> cassandraContainer() {
    return new GenericContainer<>("cassandra:3.11")
        .withNetwork(Network.SHARED)
        .withEnv("LOCAL_JMX", "no")
        .withCopyFileToContainer(
            MountableFile.forClasspathResource("cassandra/jmxremote.password", 0400),
            "/etc/cassandra/jmxremote.password")
        .withNetworkAliases("cassandra")
        .withExposedPorts(7199)
        .withStartupTimeout(Duration.ofMinutes(2))
        .waitingFor(Wait.forLogMessage(".*Startup complete.*", 1));
  }

  protected final void waitAndAssertMetrics(Iterable<Consumer<Metric>> assertions) {
    await()
        .atMost(Duration.ofSeconds(30))
        .untilAsserted(
            () -> {
              List<Metric> metrics =
                  otlpServer.getMetrics().stream()
                      .map(ExportMetricsServiceRequest::getResourceMetricsList)
                      .flatMap(rm -> rm.stream().map(ResourceMetrics::getScopeMetricsList))
                      .flatMap(Collection::stream)
                      .filter(
                          sm ->
                              sm.getScope().getName().equals("io.opentelemetry.contrib.jmxmetrics")
                                  && sm.getScope().getVersion().equals(expectedMeterVersion()))
                      .flatMap(sm -> sm.getMetricsList().stream())
                      .collect(Collectors.toList());

              assertThat(metrics).isNotEmpty();

              for (Consumer<Metric> assertion : assertions) {
                assertThat(metrics).anySatisfy(assertion);
              }
            });
  }

  @SafeVarargs
  @SuppressWarnings("varargs")
  protected final void waitAndAssertMetrics(Consumer<Metric>... assertions) {
    waitAndAssertMetrics(Arrays.asList(assertions));
  }

  protected void assertGauge(Metric metric, String name, String description, String unit) {
    assertThat(metric.getName()).isEqualTo(name);
    assertThat(metric.getDescription()).isEqualTo(description);
    assertThat(metric.getUnit()).isEqualTo(unit);
    assertThat(metric.hasGauge()).isTrue();
    assertThat(metric.getGauge().getDataPointsList())
        .satisfiesExactly(point -> assertThat(point.getAttributesList()).isEmpty());
  }

  protected void assertSum(Metric metric, String name, String description, String unit) {
    assertSum(metric, name, description, unit, /* isMonotonic= */ true);
  }

  protected void assertSum(
      Metric metric, String name, String description, String unit, boolean isMonotonic) {
    assertThat(metric.getName()).isEqualTo(name);
    assertThat(metric.getDescription()).isEqualTo(description);
    assertThat(metric.getUnit()).isEqualTo(unit);
    assertThat(metric.hasSum()).isTrue();
    assertThat(metric.getSum().getDataPointsList())
        .satisfiesExactly(point -> assertThat(point.getAttributesList()).isEmpty());
    assertThat(metric.getSum().getIsMonotonic()).isEqualTo(isMonotonic);
  }

  protected void assertTypedGauge(
      Metric metric, String name, String description, String unit, List<String> types) {
    assertThat(metric.getName()).isEqualTo(name);
    assertThat(metric.getDescription()).isEqualTo(description);
    assertThat(metric.getUnit()).isEqualTo(unit);
    assertThat(metric.hasGauge()).isTrue();
    assertTypedPoints(metric.getGauge().getDataPointsList(), types);
  }

  protected void assertTypedSum(
      Metric metric, String name, String description, String unit, List<String> types) {
    assertThat(metric.getName()).isEqualTo(name);
    assertThat(metric.getDescription()).isEqualTo(description);
    assertThat(metric.getUnit()).isEqualTo(unit);
    assertThat(metric.hasSum()).isTrue();
    assertTypedPoints(metric.getSum().getDataPointsList(), types);
  }

  @SafeVarargs
  protected final void assertSumWithAttributes(
      Metric metric,
      String name,
      String description,
      String unit,
      Consumer<MapAssert<String, String>>... attributeGroupAssertions) {
    assertThat(metric.getName()).isEqualTo(name);
    assertThat(metric.getDescription()).isEqualTo(description);
    assertThat(metric.getUnit()).isEqualTo(unit);
    assertThat(metric.hasSum()).isTrue();
    assertAttributedPoints(metric.getSum().getDataPointsList(), attributeGroupAssertions);
  }

  @SafeVarargs
  protected final void assertGaugeWithAttributes(
      Metric metric,
      String name,
      String description,
      String unit,
      Consumer<MapAssert<String, String>>... attributeGroupAssertions) {
    assertThat(metric.getName()).isEqualTo(name);
    assertThat(metric.getDescription()).isEqualTo(description);
    assertThat(metric.getUnit()).isEqualTo(unit);
    assertThat(metric.hasGauge()).isTrue();
    assertAttributedPoints(metric.getGauge().getDataPointsList(), attributeGroupAssertions);
  }

  private static String expectedMeterVersion() {
    // Automatically set by gradle when running the tests
    String version = System.getProperty("gradle.project.version");
    assertThat(version).isNotBlank();
    return version;
  }

  @SuppressWarnings("unchecked")
  private static void assertTypedPoints(List<NumberDataPoint> points, List<String> types) {
    Consumer<MapAssert<String, String>>[] assertions =
        types.stream()
            .map(
                type ->
                    (Consumer<MapAssert<String, String>>)
                        attrs -> attrs.containsOnly(entry("name", type)))
            .toArray(Consumer[]::new);

    assertAttributedPoints(points, assertions);
  }

  @SuppressWarnings("unchecked")
  private static void assertAttributedPoints(
      List<NumberDataPoint> points,
      Consumer<MapAssert<String, String>>... attributeGroupAssertions) {
    Consumer<Map<String, String>>[] assertions =
        Arrays.stream(attributeGroupAssertions)
            .map(assertion -> (Consumer<Map<String, String>>) m -> assertion.accept(assertThat(m)))
            .toArray(Consumer[]::new);
    assertThat(points)
        .extracting(
            numberDataPoint ->
                numberDataPoint.getAttributesList().stream()
                    .collect(
                        Collectors.toMap(
                            KeyValue::getKey, keyValue -> keyValue.getValue().getStringValue())))
        .satisfiesExactlyInAnyOrder(assertions);
  }

  private static class OtlpGrpcServer extends ServerExtension {

    private final BlockingQueue<ExportMetricsServiceRequest> metricRequests =
        new LinkedBlockingDeque<>();

    List<ExportMetricsServiceRequest> getMetrics() {
      return new ArrayList<>(metricRequests);
    }

    void reset() {
      metricRequests.clear();
    }

    @Override
    protected void configure(ServerBuilder sb) {
      sb.service(
          GrpcService.builder()
              .addService(
                  new MetricsServiceGrpc.MetricsServiceImplBase() {
                    @Override
                    public void export(
                        ExportMetricsServiceRequest request,
                        StreamObserver<ExportMetricsServiceResponse> responseObserver) {
                      metricRequests.add(request);
                      responseObserver.onNext(ExportMetricsServiceResponse.getDefaultInstance());
                      responseObserver.onCompleted();
                    }
                  })
              .build());
      sb.http(0);
    }
  }
}
