/*
    * Copyright 2012-2022 Bloomreach
    *
    * 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
    *
    *     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.onehippo.forge.utilities.commons.jcrmockup;
  
  import java.util.Iterator;
  import java.util.List;
  
  import javax.jcr.Node;
  import javax.jcr.NodeIterator;
  import javax.jcr.RepositoryException;
  
  import org.mockito.Mockito;
  import org.mockito.invocation.InvocationOnMock;
  import org.mockito.stubbing.Answer;
  
  
  public class NodeIteratorAnswer implements Answer<NodeIterator> {
  
      private MockNode mockNode;
  
      public NodeIteratorAnswer(MockNode mockNode) {
          this.mockNode = mockNode;
      }
  
      public NodeIterator createIterator(List<MockNode> nodes) throws RepositoryException {
          final Iterator<MockNode> mockNodeIterator = nodes.iterator();
          final NodeIterator nodeIterator = Mockito.mock(NodeIterator.class);
          final Answer<Boolean> hasNextAnswer = new HasNextAnswer(mockNodeIterator);
          final Answer<Node> nextAnswer = new NextAnswer(mockNodeIterator);
  
          Mockito.when(nodeIterator.hasNext()).thenAnswer(hasNextAnswer);
          Mockito.when(nodeIterator.next()).thenAnswer(nextAnswer);
          Mockito.when(nodeIterator.nextNode()).thenAnswer(nextAnswer);
          Mockito.doAnswer(nextAnswer).when(nodeIterator).remove();
          Mockito.when(nodeIterator.getSize()).thenReturn((long) nodes.size());
  
          return nodeIterator;
      }
  
      public NodeIterator answer(InvocationOnMock invocation) throws RepositoryException {
          final Object args[] = invocation.getArguments();
          if (args.length == 1 && args[0] instanceof String) {
              return createIterator(mockNode.getMockChildNodesByName((String) args[0]));
          } else if (args.length == 0) {
              return createIterator(mockNode.getMockChildNodes());
          }
          return null;
      }
  
      private static class HasNextAnswer implements Answer<Boolean> {
          private final Iterator<MockNode> mockNodeIterator;
  
          public HasNextAnswer(final Iterator<MockNode> mockNodeIterator) {
              this.mockNodeIterator = mockNodeIterator;
          }
  
          public Boolean answer(InvocationOnMock invocationOnMock) {
              return mockNodeIterator.hasNext();
          }
      }
  
      private static class NextAnswer implements Answer<Node> {
          private MockNode currentNode;
          private final Iterator<MockNode> mockNodeIterator;
  
          public NextAnswer(final Iterator<MockNode> mockNodeIterator) {
              this.mockNodeIterator = mockNodeIterator;
          }
  
          public Node answer(InvocationOnMock invocationOnMock) throws RepositoryException {
              final String methodName = invocationOnMock.getMethod().getName();
              if ("remove".equals(methodName)) {
                  mockNodeIterator.remove();
                  if (this.currentNode != null) {
                      this.currentNode.setRemoved(true);
                  }
                  return null;
              } else if ("next".equals(methodName) || "nextNode".equals(methodName)) {
                  this.currentNode = mockNodeIterator.next();
                  return this.currentNode.getJcrMock();
              }
              return null;
          }
      }
  }