/*
    * 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
    *
    *     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.commons.configuration2.beanutils;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  import static org.mockito.Mockito.when;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Test class for {@code CombinedBeanDeclaration}.
   */
  public class TestCombinedBeanDeclaration {
  
      /** An array with the mocks for the child bean declarations. */
      private BeanDeclaration[] declarations;
  
      /**
       * Creates a test instance with a number of mock child declarations.
       *
       * @return the test instance
       */
      private CombinedBeanDeclaration createCombinedDeclaration() {
          declarations = new BeanDeclaration[3];
          for (int i = 0; i < declarations.length; i++) {
              declarations[i] = mock(BeanDeclaration.class);
          }
          return new CombinedBeanDeclaration(declarations);
      }
  
      /**
       * Convenience method for accessing a mock declaration with the given index.
       *
       * @param idx the index
       * @return the corresponding mock child bean declaration
       */
      private BeanDeclaration decl(final int idx) {
          return declarations[idx];
      }
  
      /**
       * Tests whether the bean class name can be obtained if it is set for one of the child declarations.
       */
      @Test
      void testGetBeanClassNameDefined() {
          final CombinedBeanDeclaration cd = createCombinedDeclaration();
  
          when(decl(0).getBeanClassName()).thenReturn(null);
          when(decl(1).getBeanClassName()).thenReturn(getClass().getName());
  
          assertEquals(getClass().getName(), cd.getBeanClassName());
  
          verify(decl(0)).getBeanClassName();
          verify(decl(1)).getBeanClassName();
          verifyNoMoreDeclarationInteractions();
      }
  
      /**
       * Tests getBeanClassName() if none of the child declarations provide a value.
       */
      @Test
      void testGetBeanClassNameUndefined() {
          final CombinedBeanDeclaration cd = new CombinedBeanDeclaration();
          assertNull(cd.getBeanClassName());
      }
  
      /**
       * Tests whether the bean factory can be obtained if it is set for one child declarations.
       */
      @Test
      void testGetBeanFactoryNameDefined() {
          final CombinedBeanDeclaration cd = createCombinedDeclaration();
          final String name = "someTestBeanFactory";
 
         when(decl(0).getBeanFactoryName()).thenReturn(null);
         when(decl(1).getBeanFactoryName()).thenReturn(name);
 
         assertEquals(name, cd.getBeanFactoryName());
 
         verify(decl(0)).getBeanFactoryName();
         verify(decl(1)).getBeanFactoryName();
         verifyNoMoreDeclarationInteractions();
     }
 
     /**
      * Tests getBeanFactoryName() if none of the child declarations provide a value.
      */
     @Test
     void testGetBeanFactoryNameUndefined() {
         final CombinedBeanDeclaration cd = new CombinedBeanDeclaration();
         assertNull(cd.getBeanFactoryName());
     }
 
     /**
      * Tests whether the bean factory parameter can be obtained if it is set for one of the child declarations.
      */
     @Test
     void testGetBeanFactoryParameterDefined() {
         final CombinedBeanDeclaration cd = createCombinedDeclaration();
         final Object param = new Object();
 
         when(decl(0).getBeanFactoryParameter()).thenReturn(null);
         when(decl(1).getBeanFactoryParameter()).thenReturn(param);
 
         assertSame(param, cd.getBeanFactoryParameter());
 
         verify(decl(0)).getBeanFactoryParameter();
         verify(decl(1)).getBeanFactoryParameter();
         verifyNoMoreDeclarationInteractions();
     }
 
     /**
      * Tests getBeanFactoryParameter() if none of the child declarations provide a value.
      */
     @Test
     void testGetBeanFactoryParameterUndefined() {
         final CombinedBeanDeclaration cd = new CombinedBeanDeclaration();
         assertNull(cd.getBeanFactoryParameter());
     }
 
     /**
      * Tests whether a combined map of bean properties can be obtained.
      */
     @Test
     void testGetBeanProperties() {
         final Map<String, Object> props1 = new HashMap<>();
         final Map<String, Object> props2 = new HashMap<>();
         final Map<String, Object> props3 = new HashMap<>();
         props1.put("param1", "value1");
         props1.put("param2", "value2");
         props2.put("param2", "othervalue");
         props2.put("param3", "value3");
         props3.put("param1", "differentvalue");
         props3.put("param4", "value4");
         final CombinedBeanDeclaration cd = createCombinedDeclaration();
 
         when(decl(0).getBeanProperties()).thenReturn(props1);
         when(decl(1).getBeanProperties()).thenReturn(props2);
         when(decl(2).getBeanProperties()).thenReturn(props3);
 
         final Map<String, Object> props = cd.getBeanProperties();
 
         final Map<String, String> expected = new HashMap<>();
         expected.put("param1", "value1");
         expected.put("param2", "value2");
         expected.put("param3", "value3");
         expected.put("param4", "value4");
         assertEquals(expected, props);
 
         verify(decl(0)).getBeanProperties();
         verify(decl(1)).getBeanProperties();
         verify(decl(2)).getBeanProperties();
         verifyNoMoreDeclarationInteractions();
     }
 
     /**
      * Tests whether null return values of bean property maps are handled correctly.
      */
     @Test
     void testGetBeanPropertiesNull() {
         final BeanDeclaration child = mock(BeanDeclaration.class);
 
         when(child.getBeanProperties()).thenReturn(null);
 
         final CombinedBeanDeclaration cd = new CombinedBeanDeclaration(child);
         assertEquals(Collections.emptyMap(), cd.getBeanProperties());
 
         verify(child).getBeanProperties();
         verifyNoMoreInteractions(child);
     }
 
     /**
      * Tests whether constructor arguments can be obtained if one of the child declarations provide this data.
      */
     @Test
     void testGetConstructorArgsDefined() {
         final CombinedBeanDeclaration cd = createCombinedDeclaration();
         final Collection<ConstructorArg> args = Arrays.asList(ConstructorArg.forValue(42));
 
         when(decl(0).getConstructorArgs()).thenReturn(null);
         when(decl(1).getConstructorArgs()).thenReturn(args);
 
         assertSame(args, cd.getConstructorArgs());
 
         verify(decl(0)).getConstructorArgs();
         verify(decl(1)).getConstructorArgs();
         verifyNoMoreDeclarationInteractions();
     }
 
     /**
      * Tests getConstructorArgs() if none of the child declarations provide a value.
      */
     @Test
     void testGetConstructorArgsUndefined() {
         final CombinedBeanDeclaration cd = createCombinedDeclaration();
 
         when(decl(0).getConstructorArgs()).thenReturn(null);
         when(decl(1).getConstructorArgs()).thenReturn(new ArrayList<>());
         when(decl(2).getConstructorArgs()).thenReturn(null);
 
         assertEquals(Collections.emptyList(), new ArrayList<>(cd.getConstructorArgs()));
 
         verify(decl(0)).getConstructorArgs();
         verify(decl(1)).getConstructorArgs();
         verify(decl(2)).getConstructorArgs();
         verifyNoMoreDeclarationInteractions();
     }
 
     /**
      * Tests whether a combined map of nested bean declarations can be obtained.
      */
     @Test
     void testGetNestedBeanDeclarations() {
         final Map<String, Object> decls1 = new HashMap<>();
         final Map<String, Object> decls2 = new HashMap<>();
         final Map<String, Object> decls3 = new HashMap<>();
         decls1.put("param1", "value1");
         decls1.put("param2", "value2");
         decls2.put("param2", "othervalue");
         decls2.put("param3", "value3");
         decls3.put("param1", "differentvalue");
         decls3.put("param4", "value4");
         final CombinedBeanDeclaration cd = createCombinedDeclaration();
 
         when(decl(0).getNestedBeanDeclarations()).thenReturn(decls1);
         when(decl(1).getNestedBeanDeclarations()).thenReturn(decls2);
         when(decl(2).getNestedBeanDeclarations()).thenReturn(decls3);
 
         final Map<String, Object> decls = cd.getNestedBeanDeclarations();
 
         final Map<String, String> expected = new HashMap<>();
         expected.put("param1", "value1");
         expected.put("param2", "value2");
         expected.put("param3", "value3");
         expected.put("param4", "value4");
         assertEquals(expected, decls);
 
         verify(decl(0)).getNestedBeanDeclarations();
         verify(decl(1)).getNestedBeanDeclarations();
         verify(decl(2)).getNestedBeanDeclarations();
         verifyNoMoreDeclarationInteractions();
     }
 
     /**
      * Tests whether null return values of bean declaration maps are handled correctly.
      */
     @Test
     void testGetNestedBeanDeclarationsNull() {
         final BeanDeclaration child = mock(BeanDeclaration.class);
 
         when(child.getNestedBeanDeclarations()).thenReturn(null);
 
         final CombinedBeanDeclaration cd = new CombinedBeanDeclaration(child);
         assertEquals(Collections.emptyMap(), cd.getNestedBeanDeclarations());
 
         verify(child).getNestedBeanDeclarations();
         verifyNoMoreInteractions(child);
     }
 
     /**
      * Helper method for verifying that no more interactions have been performed on all declarations.
      */
     private void verifyNoMoreDeclarationInteractions() {
         verifyNoMoreInteractions((Object[]) declarations);
     }
 }