/*
 * 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.gcp.bigquery;

import static org.junit.Assert.assertEquals;

import com.google.api.client.util.Data;
import com.google.api.services.bigquery.model.ErrorProto;
import com.google.api.services.bigquery.model.Job;
import com.google.api.services.bigquery.model.JobReference;
import com.google.api.services.bigquery.model.JobStatus;
import com.google.api.services.bigquery.model.TableReference;
import com.google.api.services.bigquery.model.TableRow;
import java.util.Optional;
import java.util.Random;
import java.util.Set;
import org.apache.beam.sdk.coders.CoderException;
import org.apache.beam.sdk.coders.KvCoder;
import org.apache.beam.sdk.coders.ShardedKeyCoder;
import org.apache.beam.sdk.coders.StringUtf8Coder;
import org.apache.beam.sdk.extensions.gcp.util.BackOffAdapter;
import org.apache.beam.sdk.io.gcp.bigquery.BigQueryHelpers.PendingJob;
import org.apache.beam.sdk.io.gcp.bigquery.BigQueryHelpers.PendingJobManager;
import org.apache.beam.sdk.testing.CoderProperties;
import org.apache.beam.sdk.transforms.windowing.GlobalWindow;
import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
import org.apache.beam.sdk.util.CoderUtils;
import org.apache.beam.sdk.util.FluentBackoff;
import org.apache.beam.sdk.util.WindowedValue;
import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableSet;
import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.Sets;
import org.joda.time.Duration;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link BigQueryHelpers}. */
@RunWith(JUnit4.class)
public class BigQueryHelpersTest {
  @Rule public transient ExpectedException thrown = ExpectedException.none();

  @Test
  public void testTableParsing() {
    TableReference ref = BigQueryHelpers.parseTableSpec("my-project:data_set.table_name");
    assertEquals("my-project", ref.getProjectId());
    assertEquals("data_set", ref.getDatasetId());
    assertEquals("table_name", ref.getTableId());
  }

  @Test
  public void testTableParsing_validPatterns() {
    BigQueryHelpers.parseTableSpec("a123-456:foo_bar.d");
    BigQueryHelpers.parseTableSpec("a12345:b.c");
    BigQueryHelpers.parseTableSpec("b12345.c");
  }

  @Test
  public void testTableParsing_noProjectId() {
    TableReference ref = BigQueryHelpers.parseTableSpec("data_set.table_name");
    assertEquals(null, ref.getProjectId());
    assertEquals("data_set", ref.getDatasetId());
    assertEquals("table_name", ref.getTableId());
  }

  @Test
  public void testTableParsingError() {
    thrown.expect(IllegalArgumentException.class);
    BigQueryHelpers.parseTableSpec("0123456:foo.bar");
  }

  @Test
  public void testTableParsingError_2() {
    thrown.expect(IllegalArgumentException.class);
    BigQueryHelpers.parseTableSpec("myproject:.bar");
  }

  @Test
  public void testTableParsingError_3() {
    thrown.expect(IllegalArgumentException.class);
    BigQueryHelpers.parseTableSpec(":a.b");
  }

  @Test
  public void testTableParsingError_slash() {
    thrown.expect(IllegalArgumentException.class);
    BigQueryHelpers.parseTableSpec("a\\b12345:c.d");
  }

  @Test
  public void testTableDecoratorStripping() {
    assertEquals(
        "project:dataset.table",
        BigQueryHelpers.stripPartitionDecorator("project:dataset.table$20171127"));
    assertEquals(
        "project:dataset.table", BigQueryHelpers.stripPartitionDecorator("project:dataset.table"));
  }

  // Test that BigQuery's special null placeholder objects can be encoded.
  @Test
  public void testCoder_nullCell() throws CoderException {
    TableRow row = new TableRow();
    row.set("temperature", Data.nullOf(Object.class));
    row.set("max_temperature", Data.nullOf(Object.class));

    byte[] bytes = CoderUtils.encodeToByteArray(TableRowJsonCoder.of(), row);

    TableRow newRow = CoderUtils.decodeFromByteArray(TableRowJsonCoder.of(), bytes);
    byte[] newBytes = CoderUtils.encodeToByteArray(TableRowJsonCoder.of(), newRow);

    Assert.assertArrayEquals(bytes, newBytes);
  }

  @Test
  public void testShardedKeyCoderIsSerializableWithWellKnownCoderType() {
    CoderProperties.coderSerializable(ShardedKeyCoder.of(GlobalWindow.Coder.INSTANCE));
  }

  @Test
  public void testTableRowInfoCoderSerializable() {
    CoderProperties.coderSerializable(TableRowInfoCoder.of(TableRowJsonCoder.of()));
  }

  @Test
  public void testComplexCoderSerializable() {
    CoderProperties.coderSerializable(
        WindowedValue.getFullCoder(
            KvCoder.of(
                ShardedKeyCoder.of(StringUtf8Coder.of()),
                TableRowInfoCoder.of(TableRowJsonCoder.of())),
            IntervalWindow.getCoder()));
  }

  @Test
  public void testPendingJobManager() throws Exception {
    PendingJobManager jobManager =
        new PendingJobManager(
            BackOffAdapter.toGcpBackOff(
                FluentBackoff.DEFAULT
                    .withMaxRetries(Integer.MAX_VALUE)
                    .withInitialBackoff(Duration.millis(10))
                    .withMaxBackoff(Duration.millis(10))
                    .backoff()));

    Set<String> succeeded = Sets.newHashSet();
    for (int i = 0; i < 5; i++) {
      Job currentJob = new Job();
      currentJob.setKind(" bigquery#job");
      PendingJob pendingJob =
          new PendingJob(
              retryId -> {
                if (new Random().nextInt(2) == 0) {
                  throw new RuntimeException("Failing to start.");
                }
                currentJob.setJobReference(
                    new JobReference()
                        .setProjectId("")
                        .setLocation("")
                        .setJobId(retryId.getJobId()));
                return null;
              },
              retryId -> {
                if (retryId.getRetryIndex() < 5) {
                  currentJob.setStatus(new JobStatus().setErrorResult(new ErrorProto()));
                } else {
                  currentJob.setStatus(new JobStatus().setErrorResult(null));
                }
                return currentJob;
              },
              retryId -> {
                if (retryId.getJobId().equals(currentJob.getJobReference().getJobId())) {
                  return currentJob;
                } else {
                  return null;
                }
              },
              100,
              "JOB_" + i);
      jobManager.addPendingJob(
          pendingJob,
          j -> {
            succeeded.add(j.currentJobId.getJobId());
            return null;
          });
    }

    jobManager.waitForDone();
    Set<String> expectedJobs =
        ImmutableSet.of("JOB_0-5", "JOB_1-5", "JOB_2-5", "JOB_3-5", "JOB_4-5");
    assertEquals(expectedJobs, succeeded);
  }

  @Test
  public void testCreateTempTableReference() {
    String projectId = "this-is-my-project";
    String jobUuid = "this-is-my-job";
    TableReference noDataset =
        BigQueryHelpers.createTempTableReference(projectId, jobUuid, Optional.empty());

    assertEquals(noDataset.getProjectId(), projectId);
    assertEquals(noDataset.getDatasetId(), "temp_dataset_" + jobUuid);
    assertEquals(noDataset.getTableId(), "temp_table_" + jobUuid);

    Optional<String> dataset = Optional.ofNullable("my-tmp-dataset");
    TableReference tempTableReference =
        BigQueryHelpers.createTempTableReference(projectId, jobUuid, dataset);

    assertEquals(tempTableReference.getProjectId(), noDataset.getProjectId());
    assertEquals(tempTableReference.getDatasetId(), dataset.get());
    assertEquals(tempTableReference.getTableId(), noDataset.getTableId());

    assertEquals(dataset.get(), noDataset.setDatasetId(dataset.get()).getDatasetId());
  }
}