/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.beam.runners.flink;

import static org.hamcrest.Matchers.instanceOf;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.util.Collections;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.LocalEnvironment;
import org.apache.flink.api.java.RemoteEnvironment;
import org.apache.flink.configuration.RestOptions;
import org.apache.flink.runtime.jobgraph.SavepointRestoreSettings;
import org.apache.flink.streaming.api.environment.LocalStreamEnvironment;
import org.apache.flink.streaming.api.environment.RemoteStreamEnvironment;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.rules.TemporaryFolder;
import org.mockito.internal.util.reflection.Whitebox;

/** Tests for {@link FlinkExecutionEnvironments}. */
public class FlinkExecutionEnvironmentsTest {

  @Rule public TemporaryFolder temporaryFolder = new TemporaryFolder();
  @Rule public ExpectedException expectedException = ExpectedException.none();

  @Test
  public void shouldSetParallelismBatch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setParallelism(42);

    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(options.getParallelism(), is(42));
    assertThat(bev.getParallelism(), is(42));
  }

  @Test
  public void shouldSetParallelismStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setParallelism(42);

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(options.getParallelism(), is(42));
    assertThat(sev.getParallelism(), is(42));
  }

  @Test
  public void shouldSetMaxParallelismStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setMaxParallelism(42);

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(options.getMaxParallelism(), is(42));
    assertThat(sev.getMaxParallelism(), is(42));
  }

  @Test
  public void shouldInferParallelismFromEnvironmentBatch() throws IOException {
    String flinkConfDir = extractFlinkConfig();

    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setFlinkMaster("host:80");

    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList(), flinkConfDir);

    assertThat(options.getParallelism(), is(23));
    assertThat(bev.getParallelism(), is(23));
  }

  @Test
  public void shouldInferParallelismFromEnvironmentStreaming() throws IOException {
    String confDir = extractFlinkConfig();

    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setFlinkMaster("host:80");

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList(), confDir);

    assertThat(options.getParallelism(), is(23));
    assertThat(sev.getParallelism(), is(23));
  }

  @Test
  public void shouldFallbackToDefaultParallelismBatch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setFlinkMaster("host:80");

    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(options.getParallelism(), is(1));
    assertThat(bev.getParallelism(), is(1));
  }

  @Test
  public void shouldFallbackToDefaultParallelismStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setFlinkMaster("host:80");

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(options.getParallelism(), is(1));
    assertThat(sev.getParallelism(), is(1));
  }

  @Test
  public void useDefaultParallelismFromContextBatch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);

    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(bev, instanceOf(LocalEnvironment.class));
    assertThat(options.getParallelism(), is(LocalStreamEnvironment.getDefaultLocalParallelism()));
    assertThat(bev.getParallelism(), is(LocalStreamEnvironment.getDefaultLocalParallelism()));
  }

  @Test
  public void useDefaultParallelismFromContextStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(sev, instanceOf(LocalStreamEnvironment.class));
    assertThat(options.getParallelism(), is(LocalStreamEnvironment.getDefaultLocalParallelism()));
    assertThat(sev.getParallelism(), is(LocalStreamEnvironment.getDefaultLocalParallelism()));
  }

  @Test
  public void shouldParsePortForRemoteEnvironmentBatch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);
    options.setFlinkMaster("host:1234");

    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(bev, instanceOf(RemoteEnvironment.class));
    assertThat(Whitebox.getInternalState(bev, "host"), is("host"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(1234));
  }

  @Test
  public void shouldParsePortForRemoteEnvironmentStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);
    options.setFlinkMaster("host:1234");

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(sev, instanceOf(RemoteStreamEnvironment.class));
    assertThat(Whitebox.getInternalState(sev, "host"), is("host"));
    assertThat(Whitebox.getInternalState(sev, "port"), is(1234));
  }

  @Test
  public void shouldAllowPortOmissionForRemoteEnvironmentBatch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);
    options.setFlinkMaster("host");

    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(bev, instanceOf(RemoteEnvironment.class));
    assertThat(Whitebox.getInternalState(bev, "host"), is("host"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(RestOptions.PORT.defaultValue()));
  }

  @Test
  public void shouldAllowPortOmissionForRemoteEnvironmentStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);
    options.setFlinkMaster("host");

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    assertThat(sev, instanceOf(RemoteStreamEnvironment.class));
    assertThat(Whitebox.getInternalState(sev, "host"), is("host"));
    assertThat(Whitebox.getInternalState(sev, "port"), is(RestOptions.PORT.defaultValue()));
  }

  @Test
  public void shouldTreatAutoAndEmptyHostTheSameBatch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);

    ExecutionEnvironment sev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());

    options.setFlinkMaster("[auto]");

    ExecutionEnvironment sev2 =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());

    assertEquals(sev.getClass(), sev2.getClass());
  }

  @Test
  public void shouldTreatAutoAndEmptyHostTheSameStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    options.setFlinkMaster("[auto]");

    StreamExecutionEnvironment sev2 =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());

    assertEquals(sev.getClass(), sev2.getClass());
  }

  @Test
  public void shouldDetectMalformedPortBatch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);
    options.setFlinkMaster("host:p0rt");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Unparseable port number");

    FlinkExecutionEnvironments.createBatchExecutionEnvironment(options, Collections.emptyList());
  }

  @Test
  public void shouldDetectMalformedPortStreaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);
    options.setFlinkMaster("host:p0rt");

    expectedException.expect(IllegalArgumentException.class);
    expectedException.expectMessage("Unparseable port number");

    FlinkExecutionEnvironments.createStreamExecutionEnvironment(options, Collections.emptyList());
  }

  @Test
  public void shouldSupportIPv4Batch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);

    options.setFlinkMaster("192.168.1.1:1234");
    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(Whitebox.getInternalState(bev, "host"), is("192.168.1.1"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(1234));

    options.setFlinkMaster("192.168.1.1");
    bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(Whitebox.getInternalState(bev, "host"), is("192.168.1.1"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(RestOptions.PORT.defaultValue()));
  }

  @Test
  public void shouldSupportIPv4Streaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);

    options.setFlinkMaster("192.168.1.1:1234");
    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(Whitebox.getInternalState(bev, "host"), is("192.168.1.1"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(1234));

    options.setFlinkMaster("192.168.1.1");
    bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(Whitebox.getInternalState(bev, "host"), is("192.168.1.1"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(RestOptions.PORT.defaultValue()));
  }

  @Test
  public void shouldSupportIPv6Batch() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);

    options.setFlinkMaster("[FE80:CD00:0000:0CDE:1257:0000:211E:729C]:1234");
    ExecutionEnvironment bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(
        Whitebox.getInternalState(bev, "host"), is("FE80:CD00:0000:0CDE:1257:0000:211E:729C"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(1234));

    options.setFlinkMaster("FE80:CD00:0000:0CDE:1257:0000:211E:729C");
    bev =
        FlinkExecutionEnvironments.createBatchExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(
        Whitebox.getInternalState(bev, "host"), is("FE80:CD00:0000:0CDE:1257:0000:211E:729C"));
    assertThat(Whitebox.getInternalState(bev, "port"), is(RestOptions.PORT.defaultValue()));
  }

  @Test
  public void shouldSupportIPv6Streaming() {
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(FlinkRunner.class);

    options.setFlinkMaster("[FE80:CD00:0000:0CDE:1257:0000:211E:729C]:1234");
    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(
        Whitebox.getInternalState(sev, "host"), is("FE80:CD00:0000:0CDE:1257:0000:211E:729C"));
    assertThat(Whitebox.getInternalState(sev, "port"), is(1234));

    options.setFlinkMaster("FE80:CD00:0000:0CDE:1257:0000:211E:729C");
    sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());
    assertThat(
        Whitebox.getInternalState(sev, "host"), is("FE80:CD00:0000:0CDE:1257:0000:211E:729C"));
    assertThat(Whitebox.getInternalState(sev, "port"), is(RestOptions.PORT.defaultValue()));
  }

  private String extractFlinkConfig() throws IOException {
    InputStream inputStream = getClass().getResourceAsStream("/flink-conf.yaml");
    File root = temporaryFolder.getRoot();
    Files.copy(inputStream, new File(root, "flink-conf.yaml").toPath());
    return root.getAbsolutePath();
  }

  @Test
  public void shouldSetSavepointRestoreForRemoteStreaming() {
    String path = "fakePath";
    FlinkPipelineOptions options = PipelineOptionsFactory.as(FlinkPipelineOptions.class);
    options.setRunner(TestFlinkRunner.class);
    options.setFlinkMaster("host:80");
    options.setSavepointPath(path);

    StreamExecutionEnvironment sev =
        FlinkExecutionEnvironments.createStreamExecutionEnvironment(
            options, Collections.emptyList());
    // subject to change with https://issues.apache.org/jira/browse/FLINK-11048
    assertThat(sev, instanceOf(RemoteStreamEnvironment.class));
    assertThat(
        Whitebox.getInternalState(sev, "restoreSettings"),
        is(SavepointRestoreSettings.forPath(path)));
  }
}