/**
    * 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;
  
  import info.magnolia.config.NamedDefinition;
  import info.magnolia.ui.field.CompositeFieldDefinition;
  import info.magnolia.ui.field.ConfiguredComplexPropertyDefinition;
  import info.magnolia.ui.field.EditorPropertyDefinition;
  import info.magnolia.ui.field.MultiFieldDefinition;
  import info.magnolia.ui.framework.layout.SingleFieldLayoutProducer;
  
  import java.util.Collections;
  import java.util.Optional;
  import java.util.concurrent.CompletableFuture;
  import java.util.stream.Stream;
  
  import javax.inject.Inject;
  import javax.jcr.Item;
  import javax.jcr.Property;
  
  import com.machinezoo.noexception.Exceptions;
  
  /**
   * Resolves multi-field entries based on multi value property.
   */
  public class ByMultiValueProperties implements MultiFormView.EntryResolution<Property> {
  
      private int lastIndex;
  
      private final NamedDefinition propertyDefinition;
      private final MultiFieldDefinition<Item> relatedPropertyDefinition;
  
      @Inject
      ByMultiValueProperties(MultiFieldDefinition<Item> relatedPropertyDefinition) {
          this.propertyDefinition = relatedPropertyDefinition;
          this.relatedPropertyDefinition = relatedPropertyDefinition;
      }
  
      @Override
      public Stream<ComplexPropertyDefinition<Property>> resolveForRoot(Property property) {
          Stream.Builder<ComplexPropertyDefinition<Property>> collector = Stream.builder();
          for (; lastIndex < Exceptions.wrap().get(() -> property.getValues().length); lastIndex++) {
              resolvePropertyDefinition(lastIndex).ifPresent(collector::add);
          }
          return collector.build();
      }
  
      @Override
      public CompletableFuture<ComplexPropertyDefinition<Property>> pick() {
          return CompletableFuture.completedFuture(resolvePropertyDefinition(lastIndex++).orElse(null));
      }
  
      private Optional<EditorDefinition<Property>> resolveEntryEditorDefinition(int index) {
          EditorPropertyDefinition field = this.relatedPropertyDefinition.getField();
          CompositeFieldDefinition<Property> wrapper = new CompositeFieldDefinition<>();
          wrapper.setName(field.getName());
          wrapper.setItemProvider(new JcrIndexedMultiPropertyValueProvider.Definition(relatedPropertyDefinition.getName(), index));
          wrapper.setProperties(Collections.singletonList(field));
          wrapper.setLayout(new SingleFieldLayoutProducer.Definition());
          return Optional.of(wrapper);
      }
  
      private Optional<ConfiguredComplexPropertyDefinition<Property>> resolvePropertyDefinition(int index) {
          return resolveEntryEditorDefinition(index)
                  .map(entryEditorDefinition -> {
                              ConfiguredComplexPropertyDefinition<Property> property = new ConfiguredComplexPropertyDefinition.Wrapper<>(entryEditorDefinition);
                              ItemProviderDefinition<Property, Property> indexedItemProvider = new JcrIndexedMultiPropertyValueProvider.Definition(this.propertyDefinition.getName(), index);
                              property.setItemProvider(indexedItemProvider);
                             return property;
                         }
                 );
     }
 
     /**
      * Definition of {@link ByMultiValueProperties}.
      */
     public static class Definition extends MultiFormView.EntryResolution.Definition<Property> {
 
         public Definition() {
             setImplementationClass(ByMultiValueProperties.class);
         }
     }
 }