/**
    * This file Copyright (c) 2018 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.dialog.formdialog;
  
  import static com.vaadin.server.Sizeable.Unit.PERCENTAGE;
  import static java.util.stream.Collectors.toList;
  import static java.util.stream.StreamSupport.stream;
  
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.ui.dialog.ResurfaceDialogViewImpl;
  import info.magnolia.ui.vaadin.form.FormSection;
  import info.magnolia.ui.vaadin.form.FormViewReduced;
  
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  
  import javax.inject.Inject;
  
  import com.vaadin.server.Sizeable;
  import com.vaadin.ui.AbstractComponent;
  import com.vaadin.ui.ComboBox;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.ComponentContainer;
  import com.vaadin.ui.FormLayout;
  import com.vaadin.ui.TabSheet;
  import com.vaadin.ui.themes.ValoTheme;
  import com.vaadin.v7.data.Item;
  import com.vaadin.v7.data.Validatable;
  import com.vaadin.v7.ui.AbstractField;
  import com.vaadin.v7.ui.Field;
  
  /**
   * Resurface, GWT-free form that'll be passed to the DialogBuilder.
   */
  public class ResurfaceFormViewImpl extends ResurfaceDialogViewImpl implements FormView {
  
      private final SimpleTranslator i18n;
      private Item itemDatasource;
  
      private String title;
      private TabSheet tabSheet = new TabSheet();
      private ComboBox<Locale> languageSelector;
      private FormViewReduced.Listener listener;
  
      @Inject
      public ResurfaceFormViewImpl(SimpleTranslator i18n) {
          this.i18n = i18n;
  
          tabSheet.setSizeFull();
          tabSheet.addStyleName("content");
          tabSheet.addStyleName(ValoTheme.TABSHEET_FRAMED);
  
          createLocaleSelector();
          this.setContent(() -> tabSheet);
      }
  
      @Override
      public void setCurrentLocale(Locale locale) {
          this.languageSelector.setValue(locale);
      }
  
      @Override
      public void setAvailableLocales(List<Locale> locales) {
          if (locales != null && !locales.isEmpty()) {
              languageSelector.clear();
              languageSelector.setItems(locales);
             getActionAreaView().setToolbarComponent(languageSelector);
         }
     }
 
     @Override
     public void setItemDataSource(Item newDataSource) {
         this.itemDatasource = newDataSource;
     }
 
     @Override
     public Item getItemDataSource() {
         return this.itemDatasource;
     }
 
    @Override
     public void setCaption(String caption) {
        this.title = caption;
     }
 
     @Override
     public String getTitle() {
         return this.title;
     }
 
     @Override
     public void addField(Field<?> field) {
         // NOOP
     }
 
     @Override
     public void addFormSection(String tabName, FormSection inputFields) {
         final FormLayout formLayout = new FormLayout(inputFields.getComponents().toArray(new Component[]{}));
         final TabSheet.Tab tab = this.tabSheet.addTab(formLayout, tabName);
         tab.setId(inputFields.getName());
         formLayout.setWidth(95, PERCENTAGE);
     }
 
     @Override
     public void showValidation(boolean isVisible) {
         getFields().forEach(field -> ((AbstractField) field).setValidationVisible(isVisible));
     }
 
     @Override
     public void setShowAllEnabled(boolean enabled) {
         // NOOP
     }
 
     @Override
     public void setDescriptionVisibility(boolean isVisible) {
         // NOOP
     }
 
     @Override
     public boolean isValid() {
         return getFields().stream().allMatch(Validatable::isValid);
     }
 
     @Override
     public List<FormSection> getFormSections() {
         return stream(tabSheet.spliterator(), false)
                 .map(component -> new FormSectionAdapter((ComponentContainer) component, tabSheet.getTab(component).getId()))
                 .collect(toList());
     }
 
     @Override
     public Collection<Field<?>> getFields() {
         List<Field<?>> fields = getFormSections().stream()
                 .flatMap(sections -> sections.getComponents().stream())
                 .filter(component -> component instanceof Field)
                 .map(component -> (Field<?>) component)
                 .collect(toList());
         return fields;
     }
 
     @Override
     public void setListener(FormViewReduced.Listener listener) {
         this.listener = listener;
     }
 
     @Override
     public AbstractComponent asVaadinComponent() {
 
         /*
          * When a {@code com.vaadin.ui.TabSheet} is provided, let's check how many
          * {@code com.vaadin.ui.TabSheet.Tab} elements it contains. If only one, only show that.
          */
         if (tabSheet.getComponentCount() == 1) {
             tabSheet.addStyleName("single-tab");
         } else {
             tabSheet.removeStyleName("single-tab");
         }
 
         return tabSheet;
     }
 
     private void createLocaleSelector() {
         languageSelector = new ComboBox<>();
         // Language selector must have width 125px (include padding right 10px)
         languageSelector.setWidth(150, Sizeable.Unit.PIXELS);
         languageSelector.setDescription(i18n.translate("languageSelector.description"));
         languageSelector.setItemCaptionGenerator(Locale::getDisplayLanguage);
         languageSelector.setEmptySelectionAllowed(false);
         languageSelector.addValueChangeListener(event -> {
             if (this.listener != null) {
                 this.listener.localeChanged(event.getValue());
             }
         });
     }
 
     void updateFormView() {
         List<FormSection> sections = getFormSections();
         tabSheet.removeAllComponents();
         sections.forEach(section -> addFormSection(section.getName(), section));
     }
 
     private final class FormSectionAdapter extends FormSection {
 
         private final ComponentContainer layout;
 
         FormSectionAdapter(ComponentContainer layout, String name) {
             this.layout = layout;
             setName(name);
         }
 
         @Override
         public void addComponent(Component c) {
             accessTabLayout().addComponent(c);
         }
 
         ComponentContainer accessTabLayout() {
             return layout;
         }
 
         @Override
         public void removeAllComponents() {
             accessTabLayout().removeAllComponents();
         }
 
         @Override
         public void removeComponent(Component c) {
             accessTabLayout().removeComponent(c);
         }
 
         @Override
         public Iterator<Component> iterator() {
             return accessTabLayout().iterator();
         }
 
         @Override
         public int getComponentCount() {
             return accessTabLayout().getComponentCount();
         }
 
         @Override
         public List<Component> getComponents() {
             return stream(accessTabLayout().spliterator(), false).collect(toList());
         }
     }
 }