/*
    * 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.giraph.io;
  
  import java.io.IOException;
  import java.util.ArrayList;
  
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
  import org.apache.giraph.graph.Vertex;
  import org.apache.giraph.io.formats.IdWithValueTextOutputFormat;
  import org.apache.giraph.utils.NoOpComputation;
  import org.apache.hadoop.io.DoubleWritable;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.io.Writable;
  import org.apache.hadoop.mapreduce.RecordWriter;
  import org.apache.hadoop.mapreduce.TaskAttemptContext;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.mockito.Mockito.*;
  
  public class TestIdWithValueTextOutputFormat extends
      IdWithValueTextOutputFormat<Text, DoubleWritable, Writable> {
    /** Test configuration */
    private ImmutableClassesGiraphConfiguration<
        Text, DoubleWritable, Writable> conf;
    /**
     * Dummy class to allow ImmutableClassesGiraphConfiguration to be created.
     */
    public static class DummyComputation extends NoOpComputation<Text,
        DoubleWritable, DoubleWritable, DoubleWritable> { }
  
    @Before
    public void setUp() {
      GiraphConfiguration giraphConfiguration = new GiraphConfiguration();
      giraphConfiguration.setComputationClass(DummyComputation.class);
      conf = new ImmutableClassesGiraphConfiguration<Text, DoubleWritable,
          Writable>(giraphConfiguration);
    }
  
    @Test
    public void testHappyPath() throws IOException, InterruptedException {
      Text expected = new Text("Four Tops\t4.0");
  
      IdWithValueTestWorker(expected);
    }
  
    @Test
    public void testReverseIdAndValue() throws IOException, InterruptedException {
      conf.setBoolean(REVERSE_ID_AND_VALUE, true);
      Text expected = new Text("4.0\tFour Tops");
  
      IdWithValueTestWorker(expected);
    }
  
    @Test
    public void testWithDifferentDelimiter()  throws IOException,
        InterruptedException {
      conf.set(LINE_TOKENIZE_VALUE, "blah");
      Text expected = new Text("Four Topsblah4.0");
  
      IdWithValueTestWorker(expected);
    }
  
    private void IdWithValueTestWorker(Text expected)
        throws IOException, InterruptedException {
      TaskAttemptContext tac = mock(TaskAttemptContext.class);
      when(tac.getConfiguration()).thenReturn(conf);
  
      Vertex vertex = mock(Vertex.class);
      when(vertex.getId()).thenReturn(new Text("Four Tops"));
      when(vertex.getValue()).thenReturn(new DoubleWritable(4d));
  
      // Create empty iterator == no edges
      when(vertex.getEdges()).thenReturn(new ArrayList<Text>());
  
      final RecordWriter<Text, Text> tw = mock(RecordWriter.class);
      IdWithValueVertexWriter writer = new IdWithValueVertexWriter() {
        @Override
        protected RecordWriter<Text, Text> createLineRecordWriter(
            TaskAttemptContext context) throws IOException, InterruptedException {
          return tw;
       }
     };
     writer.setConf(conf);
     writer.initialize(tac);
     writer.writeVertex(vertex);
 
     verify(tw).write(expected, null);
     verify(vertex, times(0)).getEdges();
   }
 }