/*
    * 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.utils;
  
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.conf.GiraphConstants;
  import org.apache.giraph.edge.HashMapEdges;
  import org.apache.giraph.graph.Vertex;
  import org.apache.giraph.graph.VertexValueCombiner;
  import org.apache.hadoop.io.LongWritable;
  import org.apache.hadoop.io.NullWritable;
  import org.junit.Assert;
  import org.junit.Test;
  
  import java.util.AbstractMap;
  import java.util.Map;
  
  /**
   * Test TestGraph
   */
  public class TestTestGraph {
    @Test
    public void testTestGraph() {
      GiraphConfiguration conf = new GiraphConfiguration();
      GiraphConstants.VERTEX_ID_CLASS.set(conf, LongWritable.class);
      GiraphConstants.VERTEX_VALUE_CLASS.set(conf, LongWritable.class);
      GiraphConstants.EDGE_VALUE_CLASS.set(conf, NullWritable.class);
      conf.setVertexValueCombinerClass(SumLongVertexValueCombiner.class);
      conf.setOutEdgesClass(HashMapEdges.class);
      TestGraph<LongWritable, LongWritable, NullWritable> testGraph =
          new TestGraph<>(conf);
      addVertex(testGraph, 1, 10, 2, 3);
      addVertex(testGraph, 2, 20, 1, 3);
      addVertex(testGraph, 3, 30, 1, 2);
      addVertex(testGraph, 1, 100, 3, 4);
      addVertex(testGraph, 2, 200, 5, 1, 6);
  
      Vertex<LongWritable, LongWritable, NullWritable> vertex1 =
          testGraph.getVertex(new LongWritable(1));
      Assert.assertEquals(110, vertex1.getValue().get());
      Assert.assertEquals(3, vertex1.getNumEdges());
  
      Vertex<LongWritable, LongWritable, NullWritable> vertex2 =
          testGraph.getVertex(new LongWritable(2));
      Assert.assertEquals(220, vertex2.getValue().get());
      Assert.assertEquals(4, vertex2.getNumEdges());
  
      Vertex<LongWritable, LongWritable, NullWritable> vertex3 =
          testGraph.getVertex(new LongWritable(3));
      Assert.assertEquals(30, vertex3.getValue().get());
      Assert.assertEquals(2, vertex3.getNumEdges());
    }
  
    public static void addVertex(
        TestGraph<LongWritable, LongWritable, NullWritable> graph, long id,
        long value, long... neighbors) {
      Map.Entry<LongWritable, NullWritable> edges[] =
          new Map.Entry[neighbors.length];
      for (int i = 0; i < neighbors.length; i++) {
        edges[i] = new AbstractMap.SimpleEntry<>(
            new LongWritable(neighbors[i]), NullWritable.get());
      }
      graph.addVertex(new LongWritable(id), new LongWritable(value), edges);
    }
  
    /**
     * Vertex value combiner that sums up long vertex values
     */
    public static class SumLongVertexValueCombiner
        implements VertexValueCombiner<LongWritable> {
      @Override
      public void combine(LongWritable originalVertexValue,
          LongWritable vertexValue) {
        originalVertexValue.set(originalVertexValue.get() + vertexValue.get());
      }
    }
  }