/*
    * 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.event;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  
  import java.util.ArrayList;
  import java.util.Collection;
  
  import org.apache.commons.configuration2.AbstractConfiguration;
  import org.apache.commons.configuration2.BaseHierarchicalConfiguration;
  import org.apache.commons.configuration2.HierarchicalConfiguration;
  import org.apache.commons.configuration2.tree.ImmutableNode;
  import org.apache.commons.configuration2.tree.NodeHandler;
  import org.apache.commons.configuration2.tree.NodeStructureHelper;
  import org.apache.commons.configuration2.tree.QueryResult;
  import org.junit.jupiter.api.Test;
  
  /**
   * Test class for the events generated by hierarchical configurations.
   */
  public class TestHierarchicalConfigurationEvents extends AbstractTestConfigurationEvents {
      /**
       * Tests whether a received event contains a correct subnode event.
       *
       * @param event the event object
       * @param before the expected before flag
       */
      private void checkSubnodeEvent(final ConfigurationEvent event, final boolean before) {
          assertEquals(before, event.isBeforeUpdate());
          final ConfigurationEvent evSub = assertInstanceOf(ConfigurationEvent.class, event.getPropertyValue());
          assertEquals(ConfigurationEvent.ADD_PROPERTY, evSub.getEventType());
          assertEquals("newProp", evSub.getPropertyName());
          assertEquals("newValue", evSub.getPropertyValue());
          assertEquals(before, evSub.isBeforeUpdate());
      }
  
      @Override
      protected AbstractConfiguration createConfiguration() {
          return new BaseHierarchicalConfiguration();
      }
  
      /**
       * Tests events generated by addNodes() when the list of nodes is empty. In this case no events should be generated.
       */
      @Test
      public void testAddNodesEmptyEvent() {
          ((BaseHierarchicalConfiguration) config).addNodes(TEST_PROPNAME, new ArrayList<>());
          listener.done();
      }
  
      /**
       * Tests events generated by the addNodes() method.
       */
      @Test
      public void testAddNodesEvent() {
          final BaseHierarchicalConfiguration hc = (BaseHierarchicalConfiguration) config;
          final Collection<ImmutableNode> nodes = new ArrayList<>(1);
          nodes.add(NodeStructureHelper.createNode("a_key", TEST_PROPVALUE));
          hc.addNodes(TEST_PROPNAME, nodes);
          listener.checkEvent(ConfigurationEvent.ADD_NODES, TEST_PROPNAME, nodes, true);
          listener.checkEvent(ConfigurationEvent.ADD_NODES, TEST_PROPNAME, nodes, false);
          listener.done();
      }
  
      /**
       * Tests events generated by the clearTree() method.
       */
      @Test
      public void testClearTreeEvent() {
          final BaseHierarchicalConfiguration hc = (BaseHierarchicalConfiguration) config;
          final String key = EXIST_PROPERTY.substring(0, EXIST_PROPERTY.indexOf('.'));
          final NodeHandler<ImmutableNode> nodeHandler = hc.getNodeModel().getNodeHandler();
          final Collection<QueryResult<ImmutableNode>> nodes = hc.getExpressionEngine().query(nodeHandler.getRootNode(), key, nodeHandler);
          hc.clearTree(key);
          listener.checkEvent(ConfigurationEvent.CLEAR_TREE, key, null, true);
          listener.checkEvent(ConfigurationEvent.CLEAR_TREE, key, nodes, false);
          listener.done();
      }
  
      /**
       * Tests whether manipulations of a connected sub configuration trigger correct events.
       */
      @Test
     public void testSubConfigurationChangedEventConnected() {
         final HierarchicalConfiguration<ImmutableNode> sub = ((BaseHierarchicalConfiguration) config).configurationAt(EXIST_PROPERTY, true);
         sub.addProperty("newProp", "newValue");
         checkSubnodeEvent(listener.nextEvent(ConfigurationEvent.SUBNODE_CHANGED), true);
         checkSubnodeEvent(listener.nextEvent(ConfigurationEvent.SUBNODE_CHANGED), false);
         listener.done();
     }
 
     /**
      * Tests that no events are generated for a disconnected sub configuration.
      */
     @Test
     public void testSubConfigurationChangedEventNotConnected() {
         final HierarchicalConfiguration<ImmutableNode> sub = ((BaseHierarchicalConfiguration) config).configurationAt(EXIST_PROPERTY);
         sub.addProperty("newProp", "newValue");
         listener.done();
     }
 }