/**
    * This file Copyright (c) 2013-2016 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.form.field;
  
  import info.magnolia.cms.i18n.I18nContentSupport;
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.ui.api.i18n.I18NAuthoringSupport;
  import info.magnolia.ui.form.field.definition.ConfiguredFieldDefinition;
  import info.magnolia.ui.form.field.definition.MultiValueFieldDefinition;
  import info.magnolia.ui.form.field.factory.FieldFactoryFactory;
  import info.magnolia.ui.form.field.transformer.TransformedProperty;
  import info.magnolia.ui.form.field.transformer.Transformer;
  import info.magnolia.ui.form.field.transformer.multi.MultiTransformer;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.base.Function;
  import com.google.common.base.Optional;
  import com.google.common.base.Predicates;
  import com.google.common.collect.Iterators;
  import com.vaadin.data.Item;
  import com.vaadin.data.Property;
  import com.vaadin.data.util.PropertysetItem;
  import com.vaadin.ui.Alignment;
  import com.vaadin.ui.Button;
  import com.vaadin.ui.Button.ClickEvent;
  import com.vaadin.ui.Button.ClickListener;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.Field;
  import com.vaadin.ui.HasComponents;
  import com.vaadin.ui.HorizontalLayout;
  import com.vaadin.ui.NativeButton;
  import com.vaadin.ui.VerticalLayout;
  
  /**
   * Generic Multi Field.<br>
   * This generic MultiField allows to handle a Field Set. It handle :<br>
   * - The creation of new Field<br>
   * - The removal of Field<br>
   * The Field is build based on a generic {@link ConfiguredFieldDefinition}.<br>
   * The Field values are handle by a configured {@link info.magnolia.ui.form.field.transformer.Transformer} dedicated to create/retrieve properties as {@link PropertysetItem}.<br>
   */
  public class MultiField extends AbstractCustomMultiField<MultiValueFieldDefinition, PropertysetItem> {
  
      private static final Logger log = LoggerFactory.getLogger(MultiField.class);
  
      private final ConfiguredFieldDefinition fieldDefinition;
  
      private final Button addButton = new NativeButton();
      private String buttonCaptionAdd;
      private String buttonCaptionRemove;
      private String buttonCaptionMoveUp = "Move Up";
      private String buttonCaptionMoveDown = "Move Down";
  
      public MultiField(MultiValueFieldDefinition definition, FieldFactoryFactory fieldFactoryFactory, ComponentProvider componentProvider, Item relatedFieldItem, I18NAuthoringSupport i18nAuthoringSupport) {
          super(definition, fieldFactoryFactory, componentProvider, relatedFieldItem, i18nAuthoringSupport);
          this.fieldDefinition = definition.getField();
          // Only propagate read only if the parent definition is read only
          if (definition.isReadOnly()) {
              fieldDefinition.setReadOnly(true);
          }
      }
  
      /**
       * @deprecated since 5.3.5 removing i18nContentSupport dependency (actually unused way before that). Besides, fields should use i18nAuthoringSupport for internationalization.
       */
      @Deprecated
     public MultiField(MultiValueFieldDefinition definition, FieldFactoryFactory fieldFactoryFactory, I18nContentSupport i18nContentSupport, ComponentProvider componentProvider, Item relatedFieldItem) {
         this(definition, fieldFactoryFactory, componentProvider, relatedFieldItem, null);
     }
 
     @Override
     protected Component initContent() {
         // Init root layout
         addStyleName("linkfield");
         root = new VerticalLayout();
         root.setSpacing(true);
         root.setWidth(100, Unit.PERCENTAGE);
         root.setHeight(-1, Unit.PIXELS);
 
         // Init addButton
         addButton.setCaption(buttonCaptionAdd);
         addButton.addStyleName("magnoliabutton");
         addButton.addClickListener(new Button.ClickListener() {
             @Override
             public void buttonClick(ClickEvent event) {
                 int newPropertyId;
                 Property<?> property = null;
 
                 Transformer<?> transformer = ((TransformedProperty<?>) getPropertyDataSource()).getTransformer();
                 PropertysetItem item = (PropertysetItem) getPropertyDataSource().getValue();
 
                 if (transformer instanceof MultiTransformer) {
                     // create property and find its propertyId
                     property = ((MultiTransformer) transformer).createProperty();
                     newPropertyId = findPropertyId(item, property);
                 } else {
                     // get next propertyId based on property count
                     newPropertyId = item.getItemPropertyIds().size();
                 }
 
                 if (newPropertyId == -1) {
                     log.warn("Could not resolve new propertyId; cannot add new multifield entry to item '{}'.", item);
                     return;
                 }
 
                 root.addComponent(createEntryComponent(newPropertyId, property), root.getComponentCount() - 1);
             }
         });
 
         // Initialize Existing field
         initFields();
 
         return root;
     }
 
     /**
      * Initialize the MultiField. <br>
      * Create as many configured Field as we have related values already stored.
      */
     @Override
     protected void initFields(PropertysetItem newValue) {
         root.removeAllComponents();
         for (Object propertyId : newValue.getItemPropertyIds()) {
             Property<?> property = newValue.getItemProperty(propertyId);
             root.addComponent(createEntryComponent(propertyId, property));
         }
         if (!this.definition.isReadOnly()) {
             root.addComponent(addButton);
         }
     }
 
     /**
      * Create a single element.<br>
      * This single element is composed of:<br>
      * - a configured field <br>
      * - a remove Button<br>
      */
     private Component createEntryComponent(Object propertyId, Property<?> property) {
         final HorizontalLayout layout = new HorizontalLayout();
         layout.setWidth(100, Unit.PERCENTAGE);
         layout.setHeight(-1, Unit.PIXELS);
 
         final Field<?> field = createLocalField(fieldDefinition, property, true); // creates property datasource if given property is null
         layout.addComponent(field);
 
         // bind the field's property to the item
         if (property == null) {
             property = field.getPropertyDataSource();
             ((PropertysetItem) getPropertyDataSource().getValue()).addItemProperty(propertyId, property);
         }
         final Property<?> propertyReference = property;
         // set layout to full width
         layout.setWidth(100, Unit.PERCENTAGE);
 
         // distribute space in favour of field over delete button
         layout.setExpandRatio(field, 1);
         if (definition.isReadOnly()) {
             return layout;
         }
 
         // move up Button
         Button moveUpButton = new Button();
         moveUpButton.setHtmlContentAllowed(true);
         moveUpButton.setCaption("<span class=\"" + "icon-arrow2_n" + "\"></span>");
         moveUpButton.addStyleName("inline");
         moveUpButton.setDescription(buttonCaptionMoveUp);
         moveUpButton.addClickListener(new Button.ClickListener() {
 
             @Override
             public void buttonClick(Button.ClickEvent event) {
                 onMove(layout, propertyReference, true);
             }
         });
 
         // move down Button
         Button moveDownButton = new Button();
         moveDownButton.setHtmlContentAllowed(true);
         moveDownButton.setCaption("<span class=\"" + "icon-arrow2_s" + "\"></span>");
         moveDownButton.addStyleName("inline");
         moveDownButton.setDescription(buttonCaptionMoveDown);
         moveDownButton.addClickListener(new Button.ClickListener() {
 
             @Override
             public void buttonClick(Button.ClickEvent event) {
                 onMove(layout, propertyReference, false);
             }
         });
 
 
         // Delete Button
         Button deleteButton = new Button();
         deleteButton.setHtmlContentAllowed(true);
         deleteButton.setCaption("<span class=\"" + "icon-trash" + "\"></span>");
         deleteButton.addStyleName("inline");
         deleteButton.setDescription(buttonCaptionRemove);
         deleteButton.addClickListener(new ClickListener() {
 
             @Override
             public void buttonClick(ClickEvent event) {
                 onDelete(layout, propertyReference);
             }
         });
 
         layout.addComponents(moveUpButton, moveDownButton, deleteButton);
 
         // make sure button stays aligned with the field and not with the optional field label when used
         layout.setComponentAlignment(deleteButton, Alignment.BOTTOM_RIGHT);
         layout.setComponentAlignment(moveUpButton, Alignment.BOTTOM_RIGHT);
         layout.setComponentAlignment(moveDownButton, Alignment.BOTTOM_RIGHT);
 
         return layout;
     }
 
     @Override
     public Class<? extends PropertysetItem> getType() {
         return PropertysetItem.class;
     }
 
     /**
      * Caption section.
      */
     public void setButtonCaptionAdd(String buttonCaptionAdd) {
         this.buttonCaptionAdd = buttonCaptionAdd;
     }
 
     public void setButtonCaptionRemove(String buttonCaptionRemove) {
         this.buttonCaptionRemove = buttonCaptionRemove;
     }
 
     /**
      * Ensure that id of the {@link PropertysetItem} stay coherent.<br>
      * Assume that we have 3 values 0:a, 1:b, 2:c, and 1 is removed <br>
      * If we just remove 1, the {@link PropertysetItem} will contain 0:a, 2:c, .<br>
      * But we should have : 0:a, 1:c, .
      */
     private void removeValueProperty(int fromIndex) {
         getValue().removeItemProperty(fromIndex);
         int valuesSize = getValue().getItemPropertyIds().size();
         if (fromIndex == valuesSize) {
             return;
         }
         while (fromIndex < valuesSize) {
             int toIndex = fromIndex;
             fromIndex +=1;
             getValue().addItemProperty(toIndex, getValue().getItemProperty(fromIndex));
             getValue().removeItemProperty(fromIndex);
         }
     }
 
     /**
      * Switches two properties. We have to clone the original {@link PropertysetItem} to re-arrange the ordering.
      */
     private void switchItemProperties(Object firstPropertyId, Object secondPropertyId) {
         Property propertyFirst = getValue().getItemProperty(firstPropertyId);
         Property propertySecond = getValue().getItemProperty(secondPropertyId);
 
         try {
             PropertysetItem storedValues = (PropertysetItem) getValue().clone();
             if (storedValues != null) {
                 for (Object propertyId : storedValues.getItemPropertyIds()) {
                     getValue().removeItemProperty(propertyId);
                     if (propertyId == firstPropertyId) {
                         getValue().addItemProperty(firstPropertyId, propertySecond);
                     } else if (propertyId == secondPropertyId) {
                         getValue().addItemProperty(secondPropertyId, propertyFirst);
                     } else {
                         getValue().addItemProperty(propertyId, storedValues.getItemProperty(propertyId));
                     }
                 }
                 getPropertyDataSource().setValue(getValue());
             }
         } catch (CloneNotSupportedException e) {
             log.error("Unable to switch properties on MultiField. Unable to clone PropertysetItem.", e);
         }
 
     }
 
     private void onDelete(Component layout, Property<?> propertyReference) {
         root.removeComponent(layout);
         Transformer<?> transformer = ((TransformedProperty<?>) getPropertyDataSource()).getTransformer();
 
         // get propertyId to delete, this might have changed since initialization above (see #removeValueProperty)
         Object propertyId = findPropertyId(getValue(), propertyReference);
 
         if (transformer instanceof MultiTransformer) {
             ((MultiTransformer) transformer).removeProperty(propertyId);
         } else {
             if (propertyId.getClass().isAssignableFrom(Integer.class)) {
                 removeValueProperty((Integer) propertyId);
             } else {
                 log.error("Property id {} is not an integer and as such property can't be removed", propertyId);
             }
             getPropertyDataSource().setValue(getValue());
         }
     }
 
     /**
      * Takes care of moving a field up or down. Tries hard not to assume much about the layout, so we're iterating over parents
      * and component types to make sure we're dealing with Fields.
      */
     private void onMove(Component layout, Property<?> propertyReference, boolean moveUp) {
         int currentPosition = root.getComponentIndex(layout);
         int switchPosition = currentPosition + (moveUp ? -1 : 1);
 
         Field[] fields = Iterators.toArray(Iterators.filter(Iterators.transform(root.iterator(), new Function<Component, Field>() {
             @Override
             public Field apply(Component input) {
                 if (input instanceof HasComponents) {
                     Optional<Component> field = Iterators.tryFind(((HasComponents) input).iterator(), Predicates.instanceOf(Field.class));
                     if (field.isPresent()) {
                         return (Field) field.get();
                     }
                 }
                 return null;
             }
         }), Predicates.notNull()), Field.class);
 
         if (moveUp && currentPosition != 0 || (!moveUp && currentPosition != fields.length - 1)) {
             Field switchField = fields[switchPosition];
             Object currentPropertyId = MultiField.this.findPropertyId(getValue(), propertyReference);
             Object switchPropertyId = MultiField.this.findPropertyId(getValue(), switchField.getPropertyDataSource());
 
             root.replaceComponent(root.getComponent(currentPosition), root.getComponent(switchPosition));
             switchItemProperties(currentPropertyId, switchPropertyId);
         }
     }
 }