/*
    * 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.examples;
  
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.edge.ByteArrayEdges;
  import org.apache.giraph.utils.InternalVertexRunner;
  import org.junit.Test;
  
  import java.util.Map;
  
  import static org.junit.Assert.assertEquals;
  
  /**
   * Tests for {@link RandomWalkWithRestartComputation}
   */
  public class RandomWalkWithRestartComputationTest {
  
    /**
     * A local integration test on toy data
     */
    @Test
    public void testToyData() throws Exception {
      // A small graph
      String[] graph = new String[] { "12 34 56", "34 78", "56 34 78", "78 34" };
  
      GiraphConfiguration conf = new GiraphConfiguration();
      conf.setInt(RandomWalkWithRestartComputation.SOURCE_VERTEX, 12);
      conf.setInt(RandomWalkWithRestartComputation.MAX_SUPERSTEPS, 30);
      conf.setFloat(
          RandomWalkWithRestartComputation.TELEPORTATION_PROBABILITY, 0.25f);
      conf.setComputationClass(RandomWalkWithRestartComputation.class);
      conf.setOutEdgesClass(ByteArrayEdges.class);
      conf.setVertexInputFormatClass(LongDoubleDoubleTextInputFormat.class);
      conf.setVertexOutputFormatClass(
          VertexWithDoubleValueDoubleEdgeTextOutputFormat.class);
      conf.setWorkerContextClass(RandomWalkWorkerContext.class);
      conf.setMasterComputeClass(RandomWalkVertexMasterCompute.class);
      // Run internally
      Iterable<String> results = InternalVertexRunner.run(conf, graph);
  
      Map<Long, Double> steadyStateProbabilities =
          RandomWalkTestUtils.parseSteadyStateProbabilities(results);
      // values computed with external software
      // 0.25, 0.354872, 0.09375, 0.301377
      assertEquals(0.25, steadyStateProbabilities.get(12L), RandomWalkTestUtils.EPSILON);
      assertEquals(0.354872, steadyStateProbabilities.get(34L),
          RandomWalkTestUtils.EPSILON);
      assertEquals(0.09375, steadyStateProbabilities.get(56L), RandomWalkTestUtils.EPSILON);
      assertEquals(0.301377, steadyStateProbabilities.get(78L),
          RandomWalkTestUtils.EPSILON);
    }
  
    /**
     * A local integration test on toy data
     */
    @Test
    public void testWeightedGraph() throws Exception {
      // A small graph
      String[] graph =
          new String[] { "12 34:0.1 56:0.9", "34 78:0.9 56:0.1",
            "56 12:0.1 34:0.8 78:0.1", "78 34:1.0" };
  
      GiraphConfiguration conf = new GiraphConfiguration();
      conf.setInt(RandomWalkWithRestartComputation.SOURCE_VERTEX, 12);
      conf.setInt(RandomWalkWithRestartComputation.MAX_SUPERSTEPS, 30);
      conf.setFloat(
          RandomWalkWithRestartComputation.TELEPORTATION_PROBABILITY, 0.15f);
      conf.setComputationClass(RandomWalkWithRestartComputation.class);
      conf.setOutEdgesClass(ByteArrayEdges.class);
      conf.setVertexInputFormatClass(
          NormalizingLongDoubleDoubleTextInputFormat.class);
      conf.setVertexOutputFormatClass(
          VertexWithDoubleValueDoubleEdgeTextOutputFormat.class);
      conf.setWorkerContextClass(RandomWalkWorkerContext.class);
      conf.setMasterComputeClass(RandomWalkVertexMasterCompute.class);
      // Run internally
      Iterable<String> results = InternalVertexRunner.run(conf, graph);
  
      Map<Long, Double> steadyStateProbabilities =
          RandomWalkTestUtils.parseSteadyStateProbabilities(results);
      // values computed with external software
      // 0.163365, 0.378932, 0.156886, 0.300816
     assertEquals(0.163365, steadyStateProbabilities.get(12L),
         RandomWalkTestUtils.EPSILON);
     assertEquals(0.378932, steadyStateProbabilities.get(34L),
         RandomWalkTestUtils.EPSILON);
     assertEquals(0.156886, steadyStateProbabilities.get(56L),
         RandomWalkTestUtils.EPSILON);
     assertEquals(0.300816, steadyStateProbabilities.get(78L),
         RandomWalkTestUtils.EPSILON);
   }
 
 
 }