/*
    * 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.configuration2.builder.combined;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.reset;
  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.List;
  import java.util.Map;
  
  import org.apache.commons.configuration2.XMLConfiguration;
  import org.apache.commons.configuration2.builder.BasicBuilderParameters;
  import org.apache.commons.configuration2.builder.FileBasedConfigurationBuilder;
  import org.apache.commons.configuration2.builder.ReloadingFileBasedConfigurationBuilder;
  import org.apache.commons.configuration2.builder.XMLBuilderParametersImpl;
  import org.apache.commons.configuration2.ex.ConfigurationException;
  import org.apache.commons.configuration2.reloading.ReloadingController;
  import org.apache.commons.configuration2.tree.ExpressionEngine;
  import org.apache.commons.configuration2.tree.xpath.XPathExpressionEngine;
  import org.junit.jupiter.api.Test;
  
  /**
   * Test class for {@code ReloadingMultiFileConfigurationBuilder}.
   */
  public class TestReloadingMultiFileConfigurationBuilder extends AbstractMultiFileConfigurationBuilderTest {
      /**
       * A test implementation of the class under test which allows access to reloading controllers of managed configuration
       * builders.
       */
      private static final class ReloadingMultiFileConfigurationBuilderTestImpl extends ReloadingMultiFileConfigurationBuilder<XMLConfiguration> {
          /**
           * A list with mocks for reloading controllers created by this instance.
           */
          private final List<ReloadingController> reloadingControllers;
  
          public ReloadingMultiFileConfigurationBuilderTestImpl() {
              super(XMLConfiguration.class, createTestBuilderParameters(null).getParameters());
              reloadingControllers = new ArrayList<>();
          }
  
          /**
           * {@inheritDoc} This implementation creates a specialized reloading builder which is associated with a mock reloading
           * controller.
           */
          @Override
          protected FileBasedConfigurationBuilder<XMLConfiguration> createManagedBuilder(final String fileName, final Map<String, Object> params)
              throws ConfigurationException {
              final ReloadingController ctrl = mock(ReloadingController.class);
              reloadingControllers.add(ctrl);
              return new ReloadingFileBasedConfigurationBuilder<XMLConfiguration>(getResultClass(), params) {
                  @Override
                  public ReloadingController getReloadingController() {
                      return ctrl;
                  }
              };
          }
  
          /**
           * Returns the list with the mock reloading controllers for the managed configuration builders created by this instance.
           *
           * @return the list with mock reloading controllers
           */
          public List<ReloadingController> getReloadingControllers() {
              return reloadingControllers;
          }
      }
  
      /**
       * Tests whether correct managed builders are created.
       */
      @Test
      public void testCreateManagedBuilder() throws ConfigurationException {
          final ReloadingMultiFileConfigurationBuilder<XMLConfiguration> builder = new ReloadingMultiFileConfigurationBuilder<>(XMLConfiguration.class);
          final FileBasedConfigurationBuilder<XMLConfiguration> managedBuilder = builder.createManagedBuilder("test.xml",
              createTestBuilderParameters(null).getParameters());
          assertInstanceOf(ReloadingFileBasedConfigurationBuilder.class, managedBuilder);
         assertFalse(managedBuilder.isAllowFailOnInit());
     }
 
     /**
      * Tests whether the allowFailOnInit flag is passed to newly created managed builders.
      */
     @Test
     public void testCreateManagedBuilderWithAllowFailFlag() throws ConfigurationException {
         final ReloadingMultiFileConfigurationBuilder<XMLConfiguration> builder = new ReloadingMultiFileConfigurationBuilder<>(XMLConfiguration.class, null,
             true);
         final FileBasedConfigurationBuilder<XMLConfiguration> managedBuilder = builder.createManagedBuilder("test.xml",
             createTestBuilderParameters(null).getParameters());
         assertTrue(managedBuilder.isAllowFailOnInit());
     }
 
     /**
      * Tests whether parameters passed to the constructor are passed to the super class.
      */
     @Test
     public void testInitWithParameters() throws ConfigurationException {
         final ExpressionEngine engine = new XPathExpressionEngine();
         final BasicBuilderParameters params = createTestBuilderParameters(new XMLBuilderParametersImpl().setExpressionEngine(engine));
         final ReloadingMultiFileConfigurationBuilder<XMLConfiguration> builder = new ReloadingMultiFileConfigurationBuilder<>(XMLConfiguration.class,
             params.getParameters());
         switchToConfig(1);
         final XMLConfiguration config = builder.getConfiguration();
         assertSame(engine, config.getExpressionEngine());
     }
 
     /**
      * Tests whether a reloading check works correctly.
      */
     @Test
     public void testReloadingControllerCheck() throws ConfigurationException {
         final ReloadingMultiFileConfigurationBuilderTestImpl builder = new ReloadingMultiFileConfigurationBuilderTestImpl();
         switchToConfig(1);
         builder.getConfiguration();
         switchToConfig(2);
         builder.getConfiguration();
         final List<ReloadingController> controllers = builder.getReloadingControllers();
         assertEquals(2, controllers.size());
 
         for (final ReloadingController c : controllers) {
             reset(c);
             when(c.checkForReloading(null)).thenReturn(Boolean.FALSE);
         }
 
         assertFalse(builder.getReloadingController().checkForReloading(this));
 
         for (final ReloadingController c : controllers) {
             verify(c).checkForReloading(null);
             verifyNoMoreInteractions(c);
         }
     }
 
     /**
      * Tests a reloading check which detects the need to reload.
      */
     @Test
     public void testReloadingControllerCheckReloadingRequired() throws ConfigurationException {
         final ReloadingMultiFileConfigurationBuilderTestImpl builder = new ReloadingMultiFileConfigurationBuilderTestImpl();
         for (int i = 1; i <= 3; i++) {
             switchToConfig(i);
             builder.getConfiguration();
         }
         final List<ReloadingController> controllers = builder.getReloadingControllers();
 
         reset(controllers.toArray());
         when(controllers.get(0).checkForReloading(null)).thenReturn(Boolean.FALSE);
         when(controllers.get(1).checkForReloading(null)).thenReturn(Boolean.TRUE);
         when(controllers.get(2).checkForReloading(null)).thenReturn(Boolean.FALSE);
 
         assertTrue(builder.getReloadingController().checkForReloading(this));
 
         for (final ReloadingController c : controllers) {
             verify(c).checkForReloading(null);
             verifyNoMoreInteractions(c);
         }
     }
 
     /**
      * Tests whether the reloading state of the reloading controller can be reset.
      */
     @Test
     public void testReloadingControllerResetReloadingState() throws ConfigurationException {
         final ReloadingMultiFileConfigurationBuilderTestImpl builder = new ReloadingMultiFileConfigurationBuilderTestImpl();
         switchToConfig(1);
         builder.getConfiguration();
         switchToConfig(2);
         builder.getConfiguration();
         final List<ReloadingController> controllers = builder.getReloadingControllers();
 
         reset(controllers.toArray());
         for (final ReloadingController c : controllers) {
             when(c.checkForReloading(null)).thenReturn(Boolean.TRUE);
         }
 
         builder.getReloadingController().checkForReloading(null);
         builder.getReloadingController().resetReloadingState();
 
         for (final ReloadingController c : controllers) {
             verify(c).checkForReloading(null);
             verify(c).resetReloadingState();
             verifyNoMoreInteractions(c);
         }
     }
 }