/*
    *    Copyright 2009-2023 the original author or authors.
    *
    *    Licensed 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
    *
    *       https://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.ibatis.executor;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.ibatis.reflection.MetaObject;
  import org.apache.ibatis.reflection.factory.ObjectFactory;
  import org.apache.ibatis.session.Configuration;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mock;
  import org.mockito.junit.jupiter.MockitoExtension;
  
  @ExtendWith(MockitoExtension.class)
  class ResultExtractorTest {
  
    private ResultExtractor resultExtractor;
  
    @Mock
    private Configuration configuration;
    @Mock
    private ObjectFactory objectFactory;
  
    @BeforeEach
    void setUp() {
      resultExtractor = new ResultExtractor(configuration, objectFactory);
    }
  
    @Test
    void shouldExtractNullForNullTargetType() {
      final Object result = resultExtractor.extractObjectFromList(null, null);
      assertThat(result).isNull();
    }
  
    @Test
    void shouldExtractList() {
      final List<Object> list = Arrays.asList(1, 2, 3);
      final Object result = resultExtractor.extractObjectFromList(list, List.class);
      assertThat(result).isInstanceOf(List.class);
      final List resultList = (List) result;
      assertThat(resultList).isEqualTo(list);
    }
  
    @Test
    void shouldExtractArray() {
      final List<Object> list = Arrays.asList(1, 2, 3);
      final Object result = resultExtractor.extractObjectFromList(list, Integer[].class);
      assertThat(result).isInstanceOf(Integer[].class);
      final Integer[] resultArray = (Integer[]) result;
      assertThat(resultArray).isEqualTo(new Integer[] { 1, 2, 3 });
    }
  
    @Test
    void shouldExtractSet() {
      final List<Object> list = Arrays.asList(1, 2, 3);
      final Class<Set> targetType = Set.class;
      final Set set = new HashSet();
      final MetaObject metaObject = mock(MetaObject.class);
      when(objectFactory.isCollection(targetType)).thenReturn(true);
      when(objectFactory.create(targetType)).thenReturn(set);
      when(configuration.newMetaObject(set)).thenReturn(metaObject);
  
      final Set result = (Set) resultExtractor.extractObjectFromList(list, targetType);
      assertThat(result).isSameAs(set);
  
      verify(metaObject).addAll(list);
    }
  
    @Test
    void shouldExtractSingleObject() {
      final List<Object> list = Collections.singletonList("single object");
      assertThat((String) resultExtractor.extractObjectFromList(list, String.class)).isEqualTo("single object");
      assertThat((String) resultExtractor.extractObjectFromList(list, null)).isEqualTo("single object");
      assertThat((String) resultExtractor.extractObjectFromList(list, Integer.class)).isEqualTo("single object");
   }
 
   @Test
   void shouldFailWhenMutipleItemsInList() {
     final List<Object> list = Arrays.asList("first object", "second object");
     Assertions.assertThrows(ExecutorException.class, () -> resultExtractor.extractObjectFromList(list, String.class));
   }
 }