/**
    * 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.contentapp.browser.actionbar;
  
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.ui.actionbar.definition.ActionbarDefinition;
  import info.magnolia.ui.contentapp.browser.context.ValueContext;
  import info.magnolia.ui.contentapp.browser.preview.PreviewProvider;
  import info.magnolia.ui.framework.UiFrameworkView;
  import info.magnolia.ui.framework.datasource.DatasourceComponent;
  import info.magnolia.ui.framework.datasource.components.SelectedItems;
  import info.magnolia.ui.vaadin.actionbar.Actionbar;
  import info.magnolia.util.OptionalConsumer;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.inject.Inject;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.server.Resource;
  import com.vaadin.ui.CssLayout;
  
  /**
   * Actionbar view, lays out the sub-app actions according the {@link ActionbarDefinition},
   * triggers their execution against the current value of the {@link ValueContext}.
   *
   * @param <T>
   *     data type actionbar executes actions against
   */
  public class ActionbarView<T> extends CssLayout implements UiFrameworkView {
  
      private static final String PREVIEW_SECTION_NAME = "preview";
  
      private static final Logger log = LoggerFactory.getLogger(ActionbarView.class);
  
      private final Actionbar actionbar = new Actionbar();
      private final ActionbarPresenter<T> presenter;
      private final ActionbarDefinition definition;
      private final SimpleTranslator simpleTranslator;
  
      @Inject
      @SuppressWarnings("unchecked")
      public ActionbarView(ValueContext<T> valueContext, ActionbarDefinition definition, SimpleTranslator simpleTranslator, @DatasourceComponent PreviewProvider<T> previewProvider) {
          this.definition = definition;
          this.simpleTranslator = simpleTranslator;
          this.presenter = create(ActionbarPresenter.class);
  
          setHeight(100, Unit.PERCENTAGE);
          addStyleName("actionbar");
  
          initialiseActionbar(definition);
  
          valueContext.current().observe(items -> {
              this.update();
              OptionalConsumer.of(items.flatMap(SelectedItems::getFirst).flatMap(previewProvider::getResource))
                      .ifPresent(this::setPreview)
                      .ifNotPresent(() -> setPreview(null));
          });
          addComponent(actionbar);
      }
  
      private void setPreview(Resource previewResource) {
          if (previewResource != null) {
              if (!actionbar.getSections().containsKey(PREVIEW_SECTION_NAME)) {
                  actionbar.addSection(PREVIEW_SECTION_NAME, simpleTranslator.translate("actionbar.preview"));
             }
             actionbar.setSectionPreview(previewResource, PREVIEW_SECTION_NAME);
         } else {
             if (actionbar.getSections().containsKey(PREVIEW_SECTION_NAME)) {
                 actionbar.removeSection(PREVIEW_SECTION_NAME);
             }
         }
     }
 
     private void initialiseActionbar(ActionbarDefinition definition) {
         // build action bar structure from definition
         definition.getSections().forEach(section -> {
             actionbar.addSection(section.getName(), section.getLabel());
             final List<String> usedActions = new ArrayList<>();
             section.getGroups().forEach(group -> {
                 // standalone groups make no sense
                 log.debug("Group actions: {}", group.getItems());
 
                 group.getItems().forEach(action -> {
                     if (usedActions.contains(action.getName())) {
                         log.warn("Action was not added: an action with name '{}' was already added to the section '{}'.", action.getName(), section.getName());
                         return;
                     }
 
                     usedActions.add(action.getName());
                     this.presenter
                             .createActionItem(action.getName(), group.getName())
                             .ifPresent(item -> {
                                 actionbar.addAction(item, section.getName());
                                 actionbar.setActionEnabled(action.getName(), this.presenter.isEnableAction(action.getName()));
                             });
                 });
             });
         });
 
         this.actionbar.addActionTriggerListener(presenter::fireAction);
     }
 
     private void update() {
         this.definition.getSections().forEach(section -> actionbar.setSectionVisible(section.getName(), false));
         this.presenter
                 .getAvailableSection(definition.getSections())
                 .ifPresent(section -> {
                     actionbar.setSectionVisible(section.getName(), true);
                     section.getGroups().forEach(group -> group.getItems().forEach(action -> {
                         actionbar.setActionEnabled(action.getName(), this.presenter.isEnableAction(action.getName()));
                     }));
                 });
     }
 }