/*
 * 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.sdk.io.aws.sns;

import static org.assertj.core.api.Assertions.assertThat;
import static org.joda.time.Duration.millis;
import static org.joda.time.Duration.standardSeconds;

import com.amazonaws.http.SdkHttpMetadata;
import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
import com.amazonaws.services.sns.AmazonSNS;
import com.amazonaws.services.sns.model.GetTopicAttributesResult;
import com.amazonaws.services.sns.model.InternalErrorException;
import com.amazonaws.services.sns.model.PublishRequest;
import com.amazonaws.services.sns.model.PublishResult;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.UUID;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.coders.AtomicCoder;
import org.apache.beam.sdk.coders.CoderException;
import org.apache.beam.sdk.testing.ExpectedLogs;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.transforms.Count;
import org.apache.beam.sdk.transforms.Create;
import org.apache.beam.sdk.transforms.MapElements;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.PCollectionTuple;
import org.apache.beam.sdk.values.TupleTag;
import org.apache.beam.sdk.values.TypeDescriptors;
import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mockito;

/** Tests to verify writes to Sns. */
@RunWith(JUnit4.class)
public class SnsIOTest implements Serializable {

  private static final String topicName = "arn:aws:sns:us-west-2:5880:topic-FMFEHJ47NRFO";

  @Rule public TestPipeline p = TestPipeline.create();

  @Rule
  public final transient ExpectedLogs snsWriterFnLogs =
      ExpectedLogs.none(SnsIO.Write.SnsWriterFn.class);

  private static PublishRequest createSampleMessage(String message) {
    return new PublishRequest().withTopicArn(topicName).withMessage(message);
  }

  private static class Provider implements AwsClientsProvider {

    private static AmazonSNS publisher;

    public Provider(AmazonSNS pub) {
      publisher = pub;
    }

    @Override
    public AmazonCloudWatch getCloudWatchClient() {
      return Mockito.mock(AmazonCloudWatch.class);
    }

    @Override
    public AmazonSNS createSnsPublisher() {
      return publisher;
    }
  }

  @Test
  public void testDataWritesToSNS() {
    final PublishRequest request1 = createSampleMessage("my_first_message");
    final PublishRequest request2 = createSampleMessage("my_second_message");

    final TupleTag<PublishResult> results = new TupleTag<>();
    final AmazonSNS amazonSnsSuccess = getAmazonSnsMockSuccess();

    final PCollectionTuple snsWrites =
        p.apply(Create.of(request1, request2))
            .apply(
                SnsIO.write()
                    .withTopicName(topicName)
                    .withRetryConfiguration(
                        SnsIO.RetryConfiguration.create(
                            5, org.joda.time.Duration.standardMinutes(1)))
                    .withAWSClientsProvider(new Provider(amazonSnsSuccess))
                    .withResultOutputTag(results));

    final PCollection<Long> publishedResultsSize = snsWrites.get(results).apply(Count.globally());
    PAssert.that(publishedResultsSize).containsInAnyOrder(ImmutableList.of(2L));
    p.run().waitUntilFinish();
  }

  @Rule public ExpectedException thrown = ExpectedException.none();

  @Test
  public void testRetries() throws Throwable {
    thrown.expect(IOException.class);
    thrown.expectMessage("Error writing to SNS");
    thrown.expectMessage("No more attempts allowed");

    final PublishRequest request1 = createSampleMessage("my message that will not be published");
    final TupleTag<PublishResult> results = new TupleTag<>();
    final AmazonSNS amazonSnsErrors = getAmazonSnsMockErrors();
    p.apply(Create.of(request1))
        .apply(
            SnsIO.write()
                .withTopicName(topicName)
                .withRetryConfiguration(
                    SnsIO.RetryConfiguration.create(4, standardSeconds(10), millis(1)))
                .withAWSClientsProvider(new Provider(amazonSnsErrors))
                .withResultOutputTag(results));

    try {
      p.run();
    } catch (final Pipeline.PipelineExecutionException e) {
      // check 3 retries were initiated by inspecting the log before passing on the exception
      snsWriterFnLogs.verifyWarn(String.format(SnsIO.Write.SnsWriterFn.RETRY_ATTEMPT_LOG, 1));
      snsWriterFnLogs.verifyWarn(String.format(SnsIO.Write.SnsWriterFn.RETRY_ATTEMPT_LOG, 2));
      snsWriterFnLogs.verifyWarn(String.format(SnsIO.Write.SnsWriterFn.RETRY_ATTEMPT_LOG, 3));
      throw e.getCause();
    }
  }

  @Test
  public void testCustomCoder() throws Exception {
    final PublishRequest request1 = createSampleMessage("my_first_message");

    final TupleTag<PublishResult> results = new TupleTag<>();
    final AmazonSNS amazonSnsSuccess = getAmazonSnsMockSuccess();
    final MockCoder mockCoder = new MockCoder();

    final PCollectionTuple snsWrites =
        p.apply(Create.of(request1))
            .apply(
                SnsIO.write()
                    .withTopicName(topicName)
                    .withAWSClientsProvider(new Provider(amazonSnsSuccess))
                    .withResultOutputTag(results)
                    .withCoder(mockCoder));

    final PCollection<Long> publishedResultsSize =
        snsWrites
            .get(results)
            .apply(MapElements.into(TypeDescriptors.strings()).via(result -> result.getMessageId()))
            .apply(Count.globally());
    PAssert.that(publishedResultsSize).containsInAnyOrder(ImmutableList.of(1L));
    p.run().waitUntilFinish();
    assertThat(mockCoder.captured).isNotNull();
  }

  // Hand-code mock because Mockito mocks cause NotSerializableException even with
  // withSettings().serializable().
  private static class MockCoder extends AtomicCoder<PublishResult> {

    private PublishResult captured;

    @Override
    public void encode(PublishResult value, OutputStream outStream)
        throws CoderException, IOException {
      this.captured = value;
      PublishResultCoders.defaultPublishResult().encode(value, outStream);
    }

    @Override
    public PublishResult decode(InputStream inStream) throws CoderException, IOException {
      return PublishResultCoders.defaultPublishResult().decode(inStream);
    }
  };

  private static AmazonSNS getAmazonSnsMockSuccess() {
    final AmazonSNS amazonSNS = Mockito.mock(AmazonSNS.class);
    configureAmazonSnsMock(amazonSNS);

    final PublishResult result = Mockito.mock(PublishResult.class);
    final SdkHttpMetadata metadata = Mockito.mock(SdkHttpMetadata.class);
    Mockito.when(metadata.getHttpHeaders()).thenReturn(new HashMap<>());
    Mockito.when(metadata.getHttpStatusCode()).thenReturn(200);
    Mockito.when(result.getSdkHttpMetadata()).thenReturn(metadata);
    Mockito.when(result.getMessageId()).thenReturn(UUID.randomUUID().toString());
    Mockito.when(amazonSNS.publish(Mockito.any())).thenReturn(result);
    return amazonSNS;
  }

  private static AmazonSNS getAmazonSnsMockErrors() {
    final AmazonSNS amazonSNS = Mockito.mock(AmazonSNS.class);
    configureAmazonSnsMock(amazonSNS);

    Mockito.when(amazonSNS.publish(Mockito.any()))
        .thenThrow(new InternalErrorException("Service unavailable"));
    return amazonSNS;
  }

  private static void configureAmazonSnsMock(AmazonSNS amazonSNS) {
    final GetTopicAttributesResult result = Mockito.mock(GetTopicAttributesResult.class);
    final SdkHttpMetadata metadata = Mockito.mock(SdkHttpMetadata.class);
    Mockito.when(metadata.getHttpHeaders()).thenReturn(new HashMap<>());
    Mockito.when(metadata.getHttpStatusCode()).thenReturn(200);
    Mockito.when(result.getSdkHttpMetadata()).thenReturn(metadata);
    Mockito.when(amazonSNS.getTopicAttributes(Mockito.anyString())).thenReturn(result);
  }
}
