/*
 * 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.examples.cookbook;

import com.google.api.services.bigquery.model.TableRow;
import com.google.common.collect.ImmutableList;
import java.util.List;
import org.apache.beam.examples.cookbook.MaxPerKeyExamples.ExtractTempFn;
import org.apache.beam.examples.cookbook.MaxPerKeyExamples.FormatMaxesFn;
import org.apache.beam.sdk.transforms.DoFnTester;
import org.apache.beam.sdk.values.KV;
import org.hamcrest.CoreMatchers;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@link MaxPerKeyExamples}. */
@RunWith(JUnit4.class)
public class MaxPerKeyExamplesTest {

  private static final TableRow row1 = new TableRow()
        .set("month", "6").set("day", "21")
        .set("year", "2014").set("mean_temp", "85.3")
        .set("tornado", true);
  private static final TableRow row2 = new TableRow()
        .set("month", "7").set("day", "20")
        .set("year", "2014").set("mean_temp", "75.4")
        .set("tornado", false);
  private static final TableRow row3 = new TableRow()
        .set("month", "6").set("day", "18")
        .set("year", "2014").set("mean_temp", "45.3")
        .set("tornado", true);
  private static final List<TableRow> TEST_ROWS = ImmutableList.of(row1, row2, row3);

  private static final KV<Integer, Double> kv1 = KV.of(6, 85.3);
  private static final KV<Integer, Double> kv2 = KV.of(6, 45.3);
  private static final KV<Integer, Double> kv3 = KV.of(7, 75.4);

  private static final List<KV<Integer, Double>> TEST_KVS = ImmutableList.of(kv1, kv2, kv3);

  private static final TableRow resultRow1 = new TableRow()
      .set("month", 6)
      .set("max_mean_temp", 85.3);
  private static final TableRow resultRow2 = new TableRow()
      .set("month", 7)
      .set("max_mean_temp", 75.4);


  @Test
  public void testExtractTempFn() throws Exception {
    DoFnTester<TableRow, KV<Integer, Double>> extractTempFn =
        DoFnTester.of(new ExtractTempFn());
    List<KV<Integer, Double>> results = extractTempFn.processBundle(TEST_ROWS);
    Assert.assertThat(results, CoreMatchers.hasItem(kv1));
    Assert.assertThat(results, CoreMatchers.hasItem(kv2));
    Assert.assertThat(results, CoreMatchers.hasItem(kv3));
  }

  @Test
  public void testFormatMaxesFn() throws Exception {
    DoFnTester<KV<Integer, Double>, TableRow> formatMaxesFnFn =
        DoFnTester.of(new FormatMaxesFn());
    List<TableRow> results = formatMaxesFnFn.processBundle(TEST_KVS);
    Assert.assertThat(results, CoreMatchers.hasItem(resultRow1));
    Assert.assertThat(results, CoreMatchers.hasItem(resultRow2));
  }

}