/*
    * 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.collection;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.commons.collections4.Transformer;
  import org.apache.commons.collections4.TransformerUtils;
  import org.junit.jupiter.api.Test;
  
  /**
   * Extension of {@link AbstractCollectionTest} for exercising the {@link TransformedCollection}
   * implementation.
   */
  public class TransformedCollectionTest extends AbstractCollectionTest<Object> {
  
      private static final class StringToInteger implements Transformer<Object, Object> {
          @Override
          public Object transform(final Object input) {
              return Integer.valueOf((String) input);
          }
      }
  
      private static final class ToLowerCase implements Transformer<Object, Object> {
          @Override
          public Object transform(final Object input) {
              return ((String) input).toLowerCase();
          }
      }
  
      public static final Transformer<Object, Object> NOOP_TRANSFORMER = TransformerUtils.nopTransformer();
      public static final Transformer<Object, Object> STRING_TO_INTEGER_TRANSFORMER = new StringToInteger();
      public static final Transformer<Object, Object> TO_LOWER_CASE_TRANSFORMER = new ToLowerCase();
  
      @Override
      public String getCompatibilityVersion() {
          return "4";
      }
  
      @Override
      public Object[] getFullElements() {
          return new Object[] {"1", "3", "5", "7", "2", "4", "6"};
      }
  
      @Override
      public Object[] getOtherElements() {
          return new Object[] {"9", "88", "678", "87", "98", "78", "99"};
      }
  
      @Override
      public Collection<Object> makeConfirmedCollection() {
          return new ArrayList<>();
      }
  
      @Override
      public Collection<Object> makeConfirmedFullCollection() {
          return new ArrayList<>(Arrays.asList(getFullElements()));
      }
  
      @Override
      public Collection<Object> makeFullCollection() {
          final List<Object> list = new ArrayList<>(Arrays.asList(getFullElements()));
          return TransformedCollection.transformingCollection(list, NOOP_TRANSFORMER);
      }
  
      @Override
      public Collection<Object> makeObject() {
          return TransformedCollection.transformingCollection(new ArrayList<>(), NOOP_TRANSFORMER);
      }
  
      @Test
      public void testTransformedCollection() {
          final Collection<Object> coll = TransformedCollection.transformingCollection(new ArrayList<>(), STRING_TO_INTEGER_TRANSFORMER);
          assertEquals(0, coll.size());
          final Object[] elements = getFullElements();
          for (int i = 0; i < elements.length; i++) {
              coll.add(elements[i]);
             assertEquals(i + 1, coll.size());
             assertTrue(coll.contains(Integer.valueOf((String) elements[i])));
             assertFalse(coll.contains(elements[i]));
         }
 
         assertTrue(coll.remove(Integer.valueOf((String) elements[0])));
     }
 
     @Test
     public void testTransformedCollection_decorateTransform() {
         final Collection<Object> originalCollection = new ArrayList<>();
         final Object[] elements = getFullElements();
         Collections.addAll(originalCollection, elements);
         final Collection<Object> collection = TransformedCollection.transformedCollection(originalCollection, TransformedCollectionTest.STRING_TO_INTEGER_TRANSFORMER);
         assertEquals(elements.length, collection.size());
         for (final Object element : elements) {
             assertTrue(collection.contains(Integer.valueOf((String) element)));
             assertFalse(collection.contains(element));
         }
 
         assertFalse(collection.remove(elements[0]));
         assertTrue(collection.remove(Integer.valueOf((String) elements[0])));
     }
 
 //    public void testCreate() throws Exception {
 //        resetEmpty();
 //        writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/TransformedCollection.emptyCollection.version4.obj");
 //        resetFull();
 //        writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/TransformedCollection.fullCollection.version4.obj");
 //    }
 
 }