/**
    * 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.actions;
  
  import info.magnolia.ui.actionbar.definition.ActionbarDefinition;
  import info.magnolia.ui.actionbar.definition.ActionbarSectionDefinition;
  import info.magnolia.ui.api.action.ActionDefinition;
  import info.magnolia.ui.api.availability.AvailabilityDefinition;
  import info.magnolia.ui.contentapp.browser.ActionExecutionService;
  import info.magnolia.ui.contentapp.browser.context.ValueContext;
  import info.magnolia.ui.vaadin.gwt.client.actionbar.shared.ActionbarItem;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.function.Predicate;
  import java.util.stream.Stream;
  
  import javax.inject.Inject;
  
  import org.apache.commons.lang3.StringUtils;
  
  /**
   * Presenter bound to {@link ActionbarView}. Provides means of section/group/action lookup,
   * constructs DTO's for the client-side, delegates action execution calls to
   * {@link ActionExecutionService}.
   *
   * @param <T> item type.
   */
  public class ActionbarPresenter<T> {
  
      private final ActionExecutionService actionExecutionService;
      private final Map<String, ActionDefinition> actions;
      private final ActionbarDefinition actionbarDefinition;
      private final ValueContext<T> valueContext;
  
      @Inject
      ActionbarPresenter(
              ValueContext<T> valueContext,
              Map<String, ActionDefinition> actionConfiguration,
              ActionbarDefinition actionbarDefinition,
              ActionExecutionService actionExecutionService) {
          this.actionExecutionService = actionExecutionService;
          this.actions = actionConfiguration;
          this.actionbarDefinition = actionbarDefinition;
          this.valueContext = valueContext;
      }
  
      Optional<ActionbarItem> createActionItem(String actionName, String groupName) {
          final ActionDefinition actionDefinition = actions.get(actionName);
          if (actionDefinition == null) {
              return Optional.empty();
          }
  
          String label = actionDefinition.getLabel();
          if (StringUtils.isBlank(label)) {
              label = actionName;
          }
          String icon = actionDefinition.getIcon();
  
          // only icons from icon-fonts currently work
          return Optional.of(new ActionbarItem(actionName, label, icon, groupName));
      }
  
      Optional<ActionbarSectionDefinition> getAvailableSection(List<ActionbarSectionDefinition> sectionAvailabilities) {
          return sectionAvailabilities
                  .stream()
                 .filter(actionbarSection ->
                         actionExecutionService
                                 .getAvailabilityFilter(valueContext.get())
                                 .test(actionbarSection.getAvailability()))
                 .findFirst();
     }
 
     List<ActionbarItem> getAvailableActions() {
         List<ActionbarItem> actions = new ArrayList<>();
 
         getAvailableSection(actionbarDefinition.getSections())
                 .ifPresent(section ->
                         section.getGroups().forEach(group ->
                                 group.getItems().forEach(action -> {
                                     createActionItem(action.getName(), group.getName()).ifPresent(actions::add);
                                 })));
         return actions;
     }
 
     boolean isEnableAction(String actionName) {
         final Stream<T> selectedItems = valueContext.get();
         final Predicate<AvailabilityDefinition> availabilityFilter = actionExecutionService.getAvailabilityFilter(selectedItems);
         if (actions.containsKey(actionName)) {
             return availabilityFilter.test(actions.get(actionName).getAvailability());
         }
         return false;
     }
 
     void fireAction(String actionName) {
         actionExecutionService.executeAction(getActionName(actionName));
     }
 
     void fireDefaultAction() {
         if (isEnableAction(actionbarDefinition.getDefaultAction())) {
             fireAction(actionbarDefinition.getDefaultAction());
         }
     }
 
     private String getActionName(String actionToken) {
         return actionToken.contains(":") ? StringUtils.substringAfterLast(actionToken, ":") : actionToken;
     }
 }