/*
 * 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.apex;

import com.datatorrent.api.DAG;
import com.datatorrent.api.DAG.Locality;
import com.datatorrent.api.DAG.OperatorMeta;
import com.datatorrent.stram.engine.OperatorContext;
import com.google.common.collect.Sets;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Properties;
import java.util.Set;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.coders.VoidCoder;
import org.apache.beam.sdk.io.GenerateSequence;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.transforms.Count;
import org.apache.beam.sdk.transforms.Create;
import org.apache.beam.sdk.values.PCollection;
import org.hamcrest.Matchers;
import org.junit.Assert;
import org.junit.Test;

/**
 * Tests for the Apex runner.
 */
public class ApexRunnerTest {

  @Test
  public void testConfigProperties() throws Exception {

    String operName = "testProperties";
    ApexPipelineOptions options = PipelineOptionsFactory.create()
        .as(ApexPipelineOptions.class);

    // default configuration from class path
    Pipeline p = Pipeline.create();
    Create.Values<Void> empty = Create.empty(VoidCoder.of());
    p.apply(operName, empty);

    DAG dag = TestApexRunner.translate(p, options);
    OperatorMeta t1Meta = dag.getOperatorMeta(operName);
    Assert.assertNotNull(t1Meta);
    Assert.assertEquals(new Integer(32), t1Meta.getValue(OperatorContext.MEMORY_MB));

    File tmp = File.createTempFile("beam-runners-apex-", ".properties");
    tmp.deleteOnExit();
    Properties props = new Properties();
    props.setProperty("apex.operator." + operName + ".attr.MEMORY_MB", "64");
    try (FileOutputStream fos = new FileOutputStream(tmp)) {
      props.store(fos, "");
    }
    options.setConfigFile(tmp.getAbsolutePath());
    dag = TestApexRunner.translate(p, options);
    tmp.delete();

    t1Meta = dag.getOperatorMeta(operName);
    Assert.assertNotNull(t1Meta);
    Assert.assertEquals(new Integer(64), t1Meta.getValue(OperatorContext.MEMORY_MB));

  }

  @Test
  public void testParDoChaining() throws Exception {
    Pipeline p = Pipeline.create();
    long numElements = 1000;
    PCollection<Long> input = p.apply(GenerateSequence.from(0).to(numElements));
    PAssert.thatSingleton(input.apply("Count", Count.<Long>globally())).isEqualTo(numElements);

    ApexPipelineOptions options = PipelineOptionsFactory.as(ApexPipelineOptions.class);
    DAG dag = TestApexRunner.translate(p, options);

    String[] expectedThreadLocal = { "/CreateActual/FilterActuals/Window.Assign" };
    Set<String> actualThreadLocal = Sets.newHashSet();
    for (DAG.StreamMeta sm : dag.getAllStreamsMeta()) {
      DAG.OutputPortMeta opm = sm.getSource();
      if (sm.getLocality() == Locality.THREAD_LOCAL) {
         String name = opm.getOperatorMeta().getName();
         String prefix = "PAssert$";
         if (name.startsWith(prefix)) {
           // remove indeterministic prefix
           name = name.substring(prefix.length() + 1);
         }
         actualThreadLocal.add(name);
      }
    }
    Assert.assertThat(actualThreadLocal, Matchers.hasItems(expectedThreadLocal));
  }

}