/*
    * 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.commons.collections4.list;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.ListIterator;
  import java.util.Set;
  import java.util.TreeSet;
  
  import org.apache.commons.collections4.set.UnmodifiableSet;
  import org.apache.commons.lang3.StringUtils;
  import org.junit.jupiter.api.Test;
  
  /**
   * JUnit tests.
   */
  public class SetUniqueListTest<E> extends AbstractListTest<E> {
  
      final class SetUniqueList307 extends SetUniqueList<E> {
          /**
           * Generated serial version ID.
           */
          private static final long serialVersionUID = 1415013031022962158L;
  
          SetUniqueList307(final List<E> list, final Set<E> set) {
              super(list, set);
          }
      }
  
      boolean extraVerify = true;
  
      @Override
      public String getCompatibilityVersion() {
          return "4";
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public E[] getFullNonNullElements() {
          // override to avoid duplicate "One"
          return (E[]) new Object[] {
              StringUtils.EMPTY,
              "One",
              Integer.valueOf(2),
              "Three",
              Integer.valueOf(4),
              Double.valueOf(5),
              Float.valueOf(6),
              "Seven",
              "Eight",
              "Nine",
              Integer.valueOf(10),
              Short.valueOf((short) 11),
              Long.valueOf(12),
              "Thirteen",
              "14",
              "15",
              Byte.valueOf((byte) 16)
          };
      }
  
      @Override
      public List<E> makeObject() {
          return new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
      }
  
      @Test
      @SuppressWarnings("unchecked")
      public void testAdd() {
          final SetUniqueList<E> lset = new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
  
          // Duplicate element
          final E obj = (E) Integer.valueOf(1);
          lset.add(obj);
         lset.add(obj);
         assertEquals(1, lset.size(), "Duplicate element was added.");
 
         // Unique element
         lset.add((E) Integer.valueOf(2));
         assertEquals(2, lset.size(), "Unique element was not added.");
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testAddAll() {
         final SetUniqueList<E> lset = new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
 
         lset.addAll(
             Arrays.asList((E[]) new Integer[] { Integer.valueOf(1), Integer.valueOf(1)}));
 
         assertEquals(1, lset.size(), "Duplicate element was added.");
     }
 
     @Test
     @Override
     public void testCollectionAddAll() {
         // override for set behavior
         resetEmpty();
         E[] elements = getFullElements();
         boolean r = getCollection().addAll(Arrays.asList(elements));
         getConfirmed().addAll(Arrays.asList(elements));
         verify();
         assertTrue(r, "Empty collection should change after addAll");
         for (final E element : elements) {
             assertTrue(getCollection().contains(element),
                     "Collection should contain added element");
         }
 
         resetFull();
         final int size = getCollection().size();
         elements = getOtherElements();
         r = getCollection().addAll(Arrays.asList(elements));
         getConfirmed().addAll(Arrays.asList(elements));
         verify();
         assertTrue(r, "Full collection should change after addAll");
         for (int i = 0; i < elements.length; i++) {
             assertTrue(getCollection().contains(elements[i]),
                     "Full collection should contain added element " + i);
         }
         assertEquals(size + elements.length, getCollection().size(),
                 "Size should increase after addAll");
     }
 
     @Test
     @Override
     public void testCollectionIteratorRemove() {
         try {
             extraVerify = false;
             super.testCollectionIteratorRemove();
         } finally {
             extraVerify = true;
         }
     }
     @Test
     public void testCollections304() {
         final List<String> list = new LinkedList<>();
         final SetUniqueList<String> decoratedList = SetUniqueList.setUniqueList(list);
         final String s1 = "Apple";
         final String s2 = "Lemon";
         final String s3 = "Orange";
         final String s4 = "Strawberry";
 
         decoratedList.add(s1);
         decoratedList.add(s2);
         decoratedList.add(s3);
         assertEquals(3, decoratedList.size());
 
         decoratedList.set(1, s4);
         assertEquals(3, decoratedList.size());
 
         decoratedList.add(1, s4);
         assertEquals(3, decoratedList.size());
 
         decoratedList.add(1, s2);
         assertEquals(4, decoratedList.size());
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testCollections307() {
         List<E> list = new ArrayList<>();
         List<E> uniqueList = SetUniqueList.setUniqueList(list);
 
         final String hello = "Hello";
         final String world = "World";
         uniqueList.add((E) hello);
         uniqueList.add((E) world);
 
         List<E> subList = list.subList(0, 0);
         List<E> subUniqueList = uniqueList.subList(0, 0);
 
         assertFalse(subList.contains(world)); // passes
         assertFalse(subUniqueList.contains(world)); // fails
 
         List<E> worldList = new ArrayList<>();
         worldList.add((E) world);
         assertFalse(subList.contains("World")); // passes
         assertFalse(subUniqueList.contains("World")); // fails
 
         // repeat the test with a different class than HashSet;
         // which means subclassing SetUniqueList below
         list = new ArrayList<>();
         uniqueList = new SetUniqueList307(list, new TreeSet<>());
 
         uniqueList.add((E) hello);
         uniqueList.add((E) world);
 
         subList = list.subList(0, 0);
         subUniqueList = uniqueList.subList(0, 0);
 
         assertFalse(subList.contains(world)); // passes
         assertFalse(subUniqueList.contains(world)); // fails
 
         worldList = new ArrayList<>();
         worldList.add((E) world);
         assertFalse(subList.contains("World")); // passes
         assertFalse(subUniqueList.contains("World")); // fails
     }
 
     @Test
     public void testCollections701() {
         final SetUniqueList<Object> uniqueList = new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
         final Integer obj1 = Integer.valueOf(1);
         final Integer obj2 = Integer.valueOf(2);
         uniqueList.add(obj1);
         uniqueList.add(obj2);
         assertEquals(2, uniqueList.size());
         uniqueList.add(uniqueList);
         assertEquals(3, uniqueList.size());
         final List<Object> list = new LinkedList<>();
         final SetUniqueList<Object> decoratedList = SetUniqueList.setUniqueList(list);
         final String s1 = "Apple";
         final String s2 = "Lemon";
         final String s3 = "Orange";
         final String s4 = "Strawberry";
         decoratedList.add(s1);
         decoratedList.add(s2);
         decoratedList.add(s3);
         assertEquals(3, decoratedList.size());
         decoratedList.set(1, s4);
         assertEquals(3, decoratedList.size());
         decoratedList.add(decoratedList);
         assertEquals(4, decoratedList.size());
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testCreateSetBasedOnList() {
         final List<String> list = new ArrayList<>();
         list.add("One");
         list.add("Two");
         @SuppressWarnings("rawtypes") final SetUniqueList setUniqueList = (SetUniqueList) makeObject();
 
         // Standard case with HashSet
         final Set<String> setBasedOnList = setUniqueList.createSetBasedOnList(new HashSet<>(), list);
         assertEquals(list.size(), setBasedOnList.size());
         list.forEach(item -> assertTrue(setBasedOnList.contains(item)));
 
         // Use different Set than HashSet
         final Set<String> setBasedOnList1 = setUniqueList.createSetBasedOnList(new TreeSet<>(), list);
         assertEquals(list.size(), setBasedOnList1.size());
         list.forEach(item -> assertTrue(setBasedOnList1.contains(item)));
 
         // throws internally NoSuchMethodException --> results in HashSet
         final Set<String> setBasedOnList2 = setUniqueList.createSetBasedOnList(UnmodifiableSet.unmodifiableSet(new HashSet<>()), list);
         assertEquals(list.size(), setBasedOnList2.size());
         list.forEach(item -> assertTrue(setBasedOnList2.contains(item)));
 
         // provide null values as Parameter
         assertThrows(NullPointerException.class, () -> setUniqueList.createSetBasedOnList(null, list));
         assertThrows(NullPointerException.class, () -> setUniqueList.createSetBasedOnList(new HashSet<>(), null));
     }
 
     @Test
     public void testFactory() {
         final Integer[] array = { Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(1) };
         final ArrayList<Integer> list = new ArrayList<>(Arrays.asList(array));
         final SetUniqueList<Integer> lset = SetUniqueList.setUniqueList(list);
 
         assertEquals(2, lset.size(), "Duplicate element was added.");
         assertEquals(Integer.valueOf(1), lset.get(0));
         assertEquals(Integer.valueOf(2), lset.get(1));
         assertEquals(Integer.valueOf(1), list.get(0));
         assertEquals(Integer.valueOf(2), list.get(1));
     }
 
     @Test
     public void testIntCollectionAddAll() {
         // make a SetUniqueList with one element
         final List<Integer> list = new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
         final Integer existingElement = Integer.valueOf(1);
         list.add(existingElement);
 
         // add two new unique elements at index 0
         final Integer firstNewElement = Integer.valueOf(2);
         final Integer secondNewElement = Integer.valueOf(3);
         Collection<Integer> collection = Arrays.asList(firstNewElement, secondNewElement);
         list.addAll(0, collection);
         assertEquals(3, list.size(), "Unique elements should be added.");
         assertEquals(firstNewElement, list.get(0), "First new element should be at index 0");
         assertEquals(secondNewElement, list.get(1), "Second new element should be at index 1");
         assertEquals(existingElement, list.get(2), "Existing element should shift to index 2");
 
         // add a duplicate element and a unique element at index 0
         final Integer thirdNewElement = Integer.valueOf(4);
         collection = Arrays.asList(existingElement, thirdNewElement);
         list.addAll(0, collection);
         assertEquals(4, list.size(),
                 "Duplicate element should not be added, unique element should be added.");
         assertEquals(thirdNewElement, list.get(0), "Third new element should be at index 0");
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testListIterator() {
         final SetUniqueList<E> lset = new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
 
         final E obj1 = (E) Integer.valueOf(1);
         final E obj2 = (E) Integer.valueOf(2);
         lset.add(obj1);
         lset.add(obj2);
 
         // Attempts to add a duplicate object
         for (final ListIterator<E> it = lset.listIterator(); it.hasNext();) {
             it.next();
 
             if (!it.hasNext()) {
                 it.add(obj1);
                 break;
             }
         }
 
         assertEquals(2, lset.size(), "Duplicate element was added");
     }
 
     @Test
     @Override
     public void testListIteratorAdd() {
         // override to cope with Set behavior
         resetEmpty();
         final List<E> list1 = getCollection();
         final List<E> list2 = getConfirmed();
 
         final E[] elements = getOtherElements();  // changed here
         ListIterator<E> iter1 = list1.listIterator();
         ListIterator<E> iter2 = list2.listIterator();
 
         for (final E element : elements) {
             iter1.add(element);
             iter2.add(element);
             super.verify();  // changed here
         }
 
         resetFull();
         iter1 = getCollection().listIterator();
         iter2 = getConfirmed().listIterator();
         for (final E element : elements) {
             iter1.next();
             iter2.next();
             iter1.add(element);
             iter2.add(element);
             super.verify();  // changed here
         }
     }
 
     @Test
     @Override
     public void testListIteratorSet() {
         // override to block
         resetFull();
         final ListIterator<E> it = getCollection().listIterator();
         it.next();
 
         assertThrows(UnsupportedOperationException.class, () -> it.set(null));
     }
 
     @Test
     @Override
     @SuppressWarnings("unchecked")
     public void testListSetByIndex() {
         // override for set behavior
         resetFull();
         final int size = getCollection().size();
         getCollection().set(0, (E) Long.valueOf(1000));
         assertEquals(size, getCollection().size());
 
         getCollection().set(2, (E) Long.valueOf(1000));
         assertEquals(size - 1, getCollection().size());
         assertEquals(Long.valueOf(1000), getCollection().get(1));  // set into 2, but shifted down to 1
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testRetainAll() {
         final List<E> list = new ArrayList<>(10);
         final SetUniqueList<E> uniqueList = SetUniqueList.setUniqueList(list);
         for (int i = 0; i < 10; ++i) {
             uniqueList.add((E) Integer.valueOf(i));
         }
 
         final Collection<E> retained = new ArrayList<>(5);
         for (int i = 0; i < 5; ++i) {
             retained.add((E) Integer.valueOf(i * 2));
         }
 
         assertTrue(uniqueList.retainAll(retained));
         assertEquals(5, uniqueList.size());
         assertTrue(uniqueList.contains(Integer.valueOf(0)));
         assertTrue(uniqueList.contains(Integer.valueOf(2)));
         assertTrue(uniqueList.contains(Integer.valueOf(4)));
         assertTrue(uniqueList.contains(Integer.valueOf(6)));
         assertTrue(uniqueList.contains(Integer.valueOf(8)));
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testRetainAllWithInitialList() {
         // initialized with empty list
         final List<E> list = new ArrayList<>(10);
         for (int i = 0; i < 5; ++i) {
             list.add((E) Integer.valueOf(i));
         }
         final SetUniqueList<E> uniqueList = SetUniqueList.setUniqueList(list);
         for (int i = 5; i < 10; ++i) {
             uniqueList.add((E) Integer.valueOf(i));
         }
 
         final Collection<E> retained = new ArrayList<>(5);
         for (int i = 0; i < 5; ++i) {
             retained.add((E) Integer.valueOf(i * 2));
         }
 
         assertTrue(uniqueList.retainAll(retained));
         assertEquals(5, uniqueList.size());
         assertTrue(uniqueList.contains(Integer.valueOf(0)));
         assertTrue(uniqueList.contains(Integer.valueOf(2)));
         assertTrue(uniqueList.contains(Integer.valueOf(4)));
         assertTrue(uniqueList.contains(Integer.valueOf(6)));
         assertTrue(uniqueList.contains(Integer.valueOf(8)));
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testSet() {
         final SetUniqueList<E> lset = new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
 
         // Duplicate element
         final E obj1 = (E) Integer.valueOf(1);
         final E obj2 = (E) Integer.valueOf(2);
         final E obj3 = (E) Integer.valueOf(3);
 
         lset.add(obj1);
         lset.add(obj2);
         lset.set(0, obj1);
         assertEquals(2, lset.size());
         assertSame(obj1, lset.get(0));
         assertSame(obj2, lset.get(1));
 
         lset.clear();
         lset.add(obj1);
         lset.add(obj2);
         lset.set(0, obj2);
         assertEquals(1, lset.size());
         assertSame(obj2, lset.get(0));
 
         lset.clear();
         lset.add(obj1);
         lset.add(obj2);
         lset.set(0, obj3);
         assertEquals(2, lset.size());
         assertSame(obj3, lset.get(0));
         assertSame(obj2, lset.get(1));
 
         lset.clear();
         lset.add(obj1);
         lset.add(obj2);
         lset.set(1, obj1);
         assertEquals(1, lset.size());
         assertSame(obj1, lset.get(0));
     }
 
     @Test
     public void testSetCollections444() {
         final SetUniqueList<Integer> lset = new SetUniqueList<>(new ArrayList<>(), new HashSet<>());
 
         // Duplicate element
         final Integer obj1 = Integer.valueOf(1);
         final Integer obj2 = Integer.valueOf(2);
 
         lset.add(obj1);
         lset.add(obj2);
         lset.set(0, obj1);
         assertEquals(2, lset.size());
         assertSame(obj1, lset.get(0));
         assertSame(obj2, lset.get(1));
 
         assertTrue(lset.contains(obj1));
         assertTrue(lset.contains(obj2));
     }
     @Test
     @SuppressWarnings("unchecked")
     public void testSetDownwardsInList() {
         /*
          * Checks the following semantics
          * [a,b]
          * set(0,b): [b]->a
          * So UniqList contains [b] and a is returned
          */
         final ArrayList<E> l = new ArrayList<>();
         final HashSet<E> s = new HashSet<>();
         final SetUniqueList<E> ul = new SetUniqueList<>(l, s);
 
         final E a = (E) new Object();
         final E b = (E) new Object();
         ul.add(a);
         ul.add(b);
         assertEquals(a, l.get(0));
         assertEquals(b, l.get(1));
         assertTrue(s.contains(a));
         assertTrue(s.contains(b));
 
         assertEquals(a, ul.set(0, b));
         assertEquals(1, s.size());
         assertEquals(1, l.size());
         assertEquals(b, l.get(0));
         assertTrue(s.contains(b));
         assertFalse(s.contains(a));
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testSetInBiggerList() {
         /*
          * Checks the following semantics
          * [a,b,c]
          * set(0,b): [b,c]->a
          * So UniqList contains [b,c] and a is returned
          */
         final ArrayList<E> l = new ArrayList<>();
         final HashSet<E> s = new HashSet<>();
         final SetUniqueList<E> ul = new SetUniqueList<>(l, s);
 
         final E a = (E) new Object();
         final E b = (E) new Object();
         final E c = (E) new Object();
 
         ul.add(a);
         ul.add(b);
         ul.add(c);
         assertEquals(a, l.get(0));
         assertEquals(b, l.get(1));
         assertEquals(c, l.get(2));
         assertTrue(s.contains(a));
         assertTrue(s.contains(b));
         assertTrue(s.contains(c));
 
         assertEquals(a, ul.set(0, b));
         assertEquals(2, s.size());
         assertEquals(2, l.size());
         assertEquals(b, l.get(0));
         assertEquals(c, l.get(1));
         assertFalse(s.contains(a));
         assertTrue(s.contains(b));
         assertTrue(s.contains(c));
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testSetUpwardsInList() {
         /*
          * Checks the following semantics
          * [a,b,c]
          * set(1,a): [a,c]->b
          * So UniqList contains [a,c] and b is returned
          */
         final ArrayList<E> l = new ArrayList<>();
         final HashSet<E> s = new HashSet<>();
         final SetUniqueList<E> ul = new SetUniqueList<>(l, s);
 
         final E a = (E) "A";
         final E b = (E) "B";
         final E c = (E) "C";
 
         ul.add(a);
         ul.add(b);
         ul.add(c);
         assertEquals(a, l.get(0));
         assertEquals(b, l.get(1));
         assertEquals(c, l.get(2));
         assertTrue(s.contains(a));
         assertTrue(s.contains(b));
         assertTrue(s.contains(c));
 
         assertEquals(b, ul.set(1, a));
         assertEquals(2, s.size());
         assertEquals(2, l.size());
         assertEquals(a, l.get(0));
         assertEquals(c, l.get(1));
         assertTrue(s.contains(a));
         assertFalse(s.contains(b));
         assertTrue(s.contains(c));
     }
 
     @Test
     public void testSubListIsUnmodifiable() {
         resetFull();
         final List<E> subList = getCollection().subList(1, 3);
         assertEquals(2, subList.size());
         assertThrows(UnsupportedOperationException.class, () -> subList.remove(0));
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testUniqueListDoubleInsert() {
         final List<E> l = SetUniqueList.setUniqueList(new LinkedList<>());
         l.add((E) new Object());
         l.add((E) new Object());
 
         // duplicate is removed
         l.set(0, l.get(1));
         assertEquals(1, l.size());
 
         // duplicate should be removed again
         l.add(1, l.get(0));
         assertEquals(1, l.size());
     }
 
     @Test
     @SuppressWarnings("unchecked")
     public void testUniqueListReInsert() {
         final List<E> l = SetUniqueList.setUniqueList(new LinkedList<>());
         l.add((E) new Object());
         l.add((E) new Object());
 
         final E a = l.get(0);
 
         // duplicate is removed
         l.set(0, l.get(1));
         assertEquals(1, l.size());
 
         // old object is added back in
         l.add(1, a);
         assertEquals(2, l.size());
     }
 
     @Override
     @SuppressWarnings("unchecked")
     public void verify() {
         super.verify();
 
         if (extraVerify) {
             final int size = getCollection().size();
             getCollection().add((E) Long.valueOf(1000));
             assertEquals(size + 1, getCollection().size());
 
             getCollection().add((E) Long.valueOf(1000));
             assertEquals(size + 1, getCollection().size());
             assertEquals(Long.valueOf(1000), getCollection().get(size));
 
             getCollection().remove(size);
         }
     }
 
 }