/**
    * This file Copyright (c) 2019 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.templating.elements.attribute;
  
  import info.magnolia.context.Context;
  import info.magnolia.rendering.template.ComponentAvailability;
  import info.magnolia.templating.elements.AreaElement;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Optional;
  
  import javax.inject.Inject;
  import javax.inject.Provider;
  
  import org.apache.commons.collections4.CollectionUtils;
  import org.apache.commons.lang3.StringUtils;
  
  /**
   * {@link ElementAttribute} for {@link info.magnolia.rendering.template.AreaDefinition#getAvailableComponents()}.
   */
  public class AvailableComponents implements ElementAttribute<AreaElement> {
  
      private final Provider<Context> contextProvider;
  
      @Inject
      public AvailableComponents(Provider<Context> contextProvider) {
          this.contextProvider = contextProvider;
      }
  
      @Override
      public Optional<String> getValue(AreaElement element) {
          return Optional.ofNullable(resolveAvailableComponents(element));
      }
  
      private String resolveAvailableComponents(AreaElement element) {
          if (StringUtils.isNotEmpty(element.getAvailableComponents())) {
              return StringUtils.remove(element.getAvailableComponents(), " ");
          }
          if (element.getAreaDefinition() != null && element.getAreaDefinition().getAvailableComponents().size() > 0) {
              Iterator<ComponentAvailability> iterator = element.getAreaDefinition().getAvailableComponents().values().iterator();
              List<String> componentIds = new ArrayList<>();
              final Collection<String> userRoles = contextProvider.get().getUser().getAllRoles();
              while (iterator.hasNext()) {
                  ComponentAvailability availableComponent = iterator.next();
                  if (availableComponent.isEnabled()) {
                      // check roles
                      final Collection<String> roles = availableComponent.getRoles();
                      if (!roles.isEmpty()) {
                          if (CollectionUtils.containsAny(userRoles, roles)) {
                              componentIds.add(availableComponent.getId());
                          }
                      } else {
                          componentIds.add(availableComponent.getId());
                      }
                  }
              }
              return StringUtils.join(componentIds, ',');
          }
          return "";
      }
  }