/*
    * 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;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.commons.collections4.multimap.ArrayListValuedHashMap;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests for MultiMapUtils
   */
  public class MultiMapUtilsTest {
  
      @Test
      public void testEmptyIfNull() {
          assertTrue(MultiMapUtils.emptyIfNull(null).isEmpty());
  
          final MultiValuedMap<String, String> map = new ArrayListValuedHashMap<>();
          map.put("item", "value");
          assertFalse(MultiMapUtils.emptyIfNull(map).isEmpty());
      }
  
      @Test
      @SuppressWarnings({ "unchecked", "rawtypes" })
      public void testEmptyUnmodifiableMultiValuedMap() {
          final MultiValuedMap map = MultiMapUtils.EMPTY_MULTI_VALUED_MAP;
          assertTrue(map.isEmpty());
  
          assertThrows(UnsupportedOperationException.class, () -> map.put("key", "value"));
      }
  
      @Test
      public void testGetCollection() {
          assertNull(MultiMapUtils.getCollection(null, "key1"));
  
          final String[] values = { "v1", "v2", "v3" };
          final MultiValuedMap<String, String> map = new ArrayListValuedHashMap<>();
          for (final String val : values) {
              map.put("key1", val);
          }
  
          final Collection<String> col = MultiMapUtils.getCollection(map, "key1");
          assertEquals(Arrays.asList(values), col);
      }
  
      @Test
      public void testGetValuesAsBag() {
          assertNull(MultiMapUtils.getValuesAsBag(null, "key1"));
  
          final String[] values = { "v1", "v2", "v3" };
          final MultiValuedMap<String, String> map = new ArrayListValuedHashMap<>();
          for (final String val : values) {
              map.put("key1", val);
              map.put("key1", val);
          }
  
          final Bag<String> bag = MultiMapUtils.getValuesAsBag(map, "key1");
          assertEquals(6, bag.size());
          for (final String val : values) {
              assertTrue(bag.contains(val));
              assertEquals(2, bag.getCount(val));
          }
      }
  
      @Test
      public void testGetValuesAsList() {
          assertNull(MultiMapUtils.getValuesAsList(null, "key1"));
  
          final String[] values = { "v1", "v2", "v3" };
          final MultiValuedMap<String, String> map = new ArrayListValuedHashMap<>();
          for (final String val : values) {
              map.put("key1", val);
          }
  
         final List<String> list = MultiMapUtils.getValuesAsList(map, "key1");
         assertEquals(Arrays.asList(values), list);
     }
 
     @Test
     public void testGetValuesAsSet() {
         assertNull(MultiMapUtils.getValuesAsList(null, "key1"));
 
         final String[] values = { "v1", "v2", "v3" };
         final MultiValuedMap<String, String> map = new ArrayListValuedHashMap<>();
         for (final String val : values) {
             map.put("key1", val);
             map.put("key1", val);
         }
 
         final Set<String> set = MultiMapUtils.getValuesAsSet(map, "key1");
         assertEquals(new HashSet<>(Arrays.asList(values)), set);
     }
 
     @Test
     public void testIsEmptyWithEmptyMap() {
         assertTrue(MultiMapUtils.isEmpty(new ArrayListValuedHashMap<>()));
     }
 
     @Test
     public void testIsEmptyWithNonEmptyMap() {
         final MultiValuedMap<String, String> map = new ArrayListValuedHashMap<>();
         map.put("item", "value");
         assertFalse(MultiMapUtils.isEmpty(map));
     }
 
     @Test
     public void testIsEmptyWithNull() {
         assertTrue(MultiMapUtils.isEmpty(null));
     }
 
     @Test
     public void testTypeSafeEmptyMultiValuedMap() {
         final MultiValuedMap<String, String> map = MultiMapUtils.<String, String>emptyMultiValuedMap();
         assertTrue(map.isEmpty());
 
         assertThrows(UnsupportedOperationException.class, () -> map.put("key", "value"));
     }
 
 }