/**
    * This file Copyright (c) 2019 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.ui.editor.validator;
  
  
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.jcr.util.NodeNameHelper;
  import info.magnolia.objectfactory.Components;
  import info.magnolia.ui.datasource.jcr.JcrDatasource;
  import info.magnolia.ui.field.AbstractFieldValidatorFactory;
  
  import java.util.Optional;
  
  import javax.inject.Inject;
  import javax.jcr.Item;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.machinezoo.noexception.Exceptions;
  import com.vaadin.data.ValidationResult;
  import com.vaadin.data.Validator;
  import com.vaadin.data.ValueContext;
  import com.vaadin.data.validator.RegexpValidator;
  
  /**
   * Builds a unique node/property name validator.
   */
  public class NodeNameFieldValidatorFactory extends AbstractFieldValidatorFactory<NodeNameValidatorDefinition, String> {
  
      private final info.magnolia.ui.ValueContext<Item> valueContext;
      private final SimpleTranslator simpleTranslator;
      private final NodeNameHelper nodeNameHelper;
      private final JcrDatasource jcrDatasource;
  
      @Inject
      NodeNameFieldValidatorFactory(NodeNameValidatorDefinition definition, info.magnolia.ui.ValueContext<Item> valueContext, SimpleTranslator simpleTranslator, NodeNameHelper nodeNameHelper, JcrDatasource jcrDatasource) {
          super(definition);
          this.valueContext = valueContext;
          this.simpleTranslator = simpleTranslator;
          this.nodeNameHelper = nodeNameHelper;
          this.jcrDatasource = jcrDatasource;
      }
  
      /**
       * @deprecated since 6.2.10. Not meant to be extended. Create a separate validator instead. Component provider uses package protected {@link #NodeNameFieldValidatorFactory(NodeNameValidatorDefinition, info.magnolia.ui.ValueContext, info.magnolia.i18nsystem.SimpleTranslator, info.magnolia.jcr.util.NodeNameHelper, info.magnolia.ui.datasource.jcr.JcrDatasource)}.
       */
      @Deprecated
      public NodeNameFieldValidatorFactory(NodeNameValidatorDefinition definition, info.magnolia.ui.ValueContext<Item> valueContext, SimpleTranslator simpleTranslator, NodeNameHelper nodeNameHelper) {
          this(definition, valueContext, simpleTranslator, nodeNameHelper, Components.getComponent(JcrDatasource.class));
      }
  
      @Override
      public Validator<String> createValidator() {
          return new RegexpValidator("Node name can't be empty", ".+") {
              @Override
              public ValidationResult apply(String value, ValueContext context) {
                  ValidationResult validationResult = super.apply(value, context);
                  if (validationResult.isError()) {
                      return validationResult;
                  }
                  Item item = valueContext.getSingle()
                          .orElseGet(jcrDatasource::getRoot);
  
                  return Optional.of(item)
                          .map(Exceptions.wrap().function(node -> definition.getMode() == NodeNameValidatorDefinition.Mode.ADD ? node : node.getParent()))
                          .map(Exceptions.wrap().function(Item::getPath))
                         .map(path -> StringUtils.appendIfMissing(path, "/"))
                         .map(path -> path + nodeNameHelper.getValidatedName(value))
                         .filter(Exceptions.wrap().predicate(path -> jcrDatasource.getJCRSession().itemExists(path)))
                         .map(Exceptions.wrap().function(path -> jcrDatasource.getJCRSession().getItem(path)))
                         .filter(Exceptions.wrap().predicate(sibling -> isFailure(sibling, item)))
                         .map(any -> getI18nErrorMessage(value))
                         .map(ValidationResult::error)
                         .orElse(validationResult);
             }
 
             private boolean isFailure(Item sibling, Item item) throws RepositoryException {
                 if (item.isNode() && sibling.isNode()) {
                     return !((Node) sibling).getIdentifier().equals(((Node) item).getIdentifier());
                 } else {
                     return !sibling.getName().equals(item.getName());
                 }
             }
 
             private String getI18nErrorMessage(String value) {
                 return simpleTranslator.translate("{0} already exists.", value);
             }
         };
     }
 
 }