/**
    * 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.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.ActionConfigurationContext;
  import info.magnolia.ui.contentapp.browser.context.ValueContext;
  import info.magnolia.ui.framework.datasource.components.SelectedItems;
  import info.magnolia.ui.vaadin.actionbar.Actionbar;
  import info.magnolia.ui.vaadin.gwt.client.actionbar.shared.ActionbarItem;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.function.Predicate;
  
  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 ActionConfigurationContext actionConfiguration;
      private final ValueContext<T> valueContext;
  
      @Inject
      ActionbarPresenter(
              ValueContext<T> valueContext,
              ActionConfigurationContext actionConfiguration,
              ActionExecutionService actionExecutionService) {
          this.actionExecutionService = actionExecutionService;
          this.actionConfiguration = actionConfiguration;
          this.valueContext = valueContext;
      }
  
      Optional<ActionbarItem> createActionItem(String actionName, String groupName) {
          return actionConfiguration.actions().value().flatMap(actions -> {
              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) {
          final SelectedItems<T> selectedItems = valueContext.current().value().orElseGet(SelectedItems::empty);
  
          final Predicate<AvailabilityDefinition> availabilityFilter = actionExecutionService.getAvailabilityFilter(selectedItems);
         return sectionAvailabilities
                 .stream()
                 .filter(actionbarSection -> availabilityFilter.test(actionbarSection.getAvailability()))
                 .findFirst();
     }
 
     boolean isEnableAction(String actionName) {
         final SelectedItems<T> selectedItems = valueContext.current().value().orElseGet(SelectedItems::empty);
         final Predicate<AvailabilityDefinition> availabilityFilter = actionExecutionService.getAvailabilityFilter(selectedItems);
 
         Optional<Map<String, ActionDefinition>> actionConfigOpt = actionConfiguration.actions().value();
         if (actionConfigOpt.isPresent() && actionConfigOpt.get().containsKey(actionName)) {
             return availabilityFilter.test(actionConfigOpt.get().get(actionName).getAvailability());
         }
         return false;
     }
 
     public void fireAction(Actionbar.ActionTriggerEvent actionTriggerEvent) {
         actionExecutionService.executeAction(getActionName(actionTriggerEvent.getActionName()),
                 valueContext.current().nullableValue());
     }
 
     private String getActionName(String actionToken) {
         return StringUtils.substringAfterLast(actionToken, ":");
     }
 }