/*
    * 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.writable.kryo;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.Arrays;
  import java.util.List;
  
  import org.apache.giraph.types.ops.collections.array.WLongArrayList;
  import org.apache.giraph.utils.WritableUtils;
  import org.apache.hadoop.io.LongWritable;
  import org.junit.Assert;
  import org.junit.Test;
  
  import com.google.common.collect.ImmutableMap;
  
  import it.unimi.dsi.fastutil.longs.Long2IntOpenHashMap;
  import it.unimi.dsi.fastutil.longs.LongArrayList;
  
  
  /**
   * Tests some subtle cases of kryo serialization.
   */
  public class KryoWritableTest {
    public static class TestClassA extends KryoWritable {
      final String testObject;
      final List list;
      final int something;
  
      public TestClassA(String testObject, List list, int something) {
        this.testObject = testObject;
        this.list = list;
        this.something = something;
      }
  
      public TestClassA() {
        this.testObject = null;
        this.list = null;
        this.something = -1;
      }
    }
  
    @Test
    public void testTestClassA() throws Exception {
      String testObject = "Hello World!";
      TestClassA res = new TestClassA();
      WritableUtils.copyInto(
          new TestClassA(testObject, Arrays.asList(1, 2, 3), 5), res, true);
  
      assertEquals(testObject, res.testObject);
  
      assertEquals(3, res.list.size());
      assertEquals(1, res.list.get(0));
      assertEquals(2, res.list.get(1));
      assertEquals(3, res.list.get(2));
  
      assertEquals(5, res.something);
    }
  
    public static class LongKryoWritable extends KryoWritable {
      private long value;
  
      public LongKryoWritable(long value) {
        this.value = value;
      }
  
      public long get() {
        return value;
      }
  
      public void set(long value) {
        this.value = value;
      }
    }
  
  
    int multiplier = 10; // use 5000 for profiling
    int longTestTimes = 1000 * multiplier;
  
    @Test
    public void testLongKryoWritable() throws Exception {
      LongKryoWritable from = new LongKryoWritable(0);
      LongKryoWritable to = new LongKryoWritable(0);
 
     for (int i = 0; i < longTestTimes; i++) {
       from.set(i);
       WritableUtils.copyInto(from, to, true);
       assertEquals(i, to.get());
     }
   }
 
   @Test
   public void testLongWritable() throws Exception {
     LongWritable from = new LongWritable(0);
     LongWritable to = new LongWritable(0);
 
     for (int i = 0; i < longTestTimes; i++) {
       from.set(i);
       WritableUtils.copyInto(from, to, true);
       assertEquals(i, to.get());
     }
   }
 
   public static class LongListKryoWritable extends KryoWritable {
     public LongArrayList value;
 
     public LongListKryoWritable(LongArrayList value) {
       this.value = value;
     }
   }
 
   int longListTestTimes = 1 * multiplier;
   int longListTestSize = 100000;
 
   @Test
   public void testLongListKryoWritable() throws Exception {
     LongArrayList list = new LongArrayList(longListTestSize);
     for (int i = 0; i < longListTestSize; i++) {
       list.add(i);
     }
 
     LongListKryoWritable from = new LongListKryoWritable(list);
     LongListKryoWritable to = new LongListKryoWritable(null);
 
     for (int i = 0; i < longListTestTimes; i++) {
       from.value.set((2 * i) % longListTestSize, 0);
       WritableUtils.copyInto(from, to, true);
     }
   }
 
   @Test
   public void testLongListWritable() throws Exception {
     WLongArrayList from = new WLongArrayList(longListTestSize);
     LongWritable value = new LongWritable();
     for (int i = 0; i < longListTestSize; i++) {
       value.set(i);
       from.addW(value);
     }
 
     WLongArrayList to = new WLongArrayList(longListTestSize);
     value.set(0);
 
     for (int i = 0; i < longListTestTimes; i++) {
       from.setW((2 * i) % longListTestSize, value);
       WritableUtils.copyInto(from, to, true);
     }
   }
 
   public static class NestedKryoWritable<T> extends KryoWritable {
     public LongKryoWritable value1;
     public T value2;
 
     public NestedKryoWritable(LongKryoWritable value1, T value2) {
       this.value1 = value1;
       this.value2 = value2;
     }
   }
 
   @Test
   public void testNestedKryoWritable() throws Exception {
     LongKryoWritable inner = new LongKryoWritable(5);
     NestedKryoWritable<LongKryoWritable> res = new NestedKryoWritable<>(null, null);
     WritableUtils.copyInto(
         new NestedKryoWritable<>(inner, inner), res, true);
 
     assertEquals(5, res.value1.get());
     Assert.assertTrue(res.value1 == res.value2);
   }
 
   @Test
   public void testRecursiveKryoWritable() throws Exception {
     LongKryoWritable inner = new LongKryoWritable(5);
     NestedKryoWritable wanted = new NestedKryoWritable<>(inner, null);
     wanted.value2 = wanted;
 
     NestedKryoWritable res = new NestedKryoWritable<>(null, null);
     WritableUtils.copyInto(wanted, res, true);
 
     assertEquals(5, res.value1.get());
     Assert.assertTrue(res == res.value2);
   }
 
   @Test
   public void testKryoImmutableMap() throws Exception {
     Long2IntOpenHashMap map = new Long2IntOpenHashMap();
     map.put(1, 2);
     map.put(10, 20);
     ImmutableMap<Long, Integer> copy =
         WritableUtils.createCopy(
             new KryoWritableWrapper<>(ImmutableMap.copyOf(map))).get();
     Assert.assertEquals(2, copy.size());
     Assert.assertEquals(2, copy.get(1L).intValue());
     Assert.assertEquals(20, copy.get(10L).intValue());
   }
 }