/**
    * This file Copyright (c) 2021 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.admincentral.compatibility;
  
  import info.magnolia.event.EventBus;
  import info.magnolia.event.SystemEventBus;
  import info.magnolia.i18nsystem.I18nizer;
  import info.magnolia.ui.admincentral.AdmincentralModule;
  import info.magnolia.ui.api.app.launcherlayout.AppLauncherGroupDefinition;
  import info.magnolia.ui.api.app.launcherlayout.AppLauncherGroupEntryDefinition;
  import info.magnolia.ui.api.app.launcherlayout.AppLauncherLayoutDefinition;
  import info.magnolia.ui.api.app.launcherlayout.AppLauncherLayoutManager;
  import info.magnolia.ui.api.app.launcherlayout.AppLauncherLayoutManagerImpl;
  import info.magnolia.ui.api.app.launcherlayout.ConfiguredAppLauncherGroupDefinition;
  import info.magnolia.ui.api.app.launcherlayout.ConfiguredAppLauncherLayoutDefinition;
  import info.magnolia.ui.api.app.registry.AppDescriptorRegistry;
  
  import java.util.Collection;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Provider;
  import javax.inject.Singleton;
  
  /**
   * Compatibility implementation of {@link AppLauncherLayoutManager} merging old and new app launcher layout configurations.
   */
  @Singleton
  public class CompatibilityAppLauncherLayoutManager extends AppLauncherLayoutManagerImpl {
  
      private final Provider<AdmincentralModule> oldAdmincentralModule;
      private final Provider<info.magnolia.admincentral.AdmincentralModule> newAdmincentralModule;
  
      @Inject
      public CompatibilityAppLauncherLayoutManager(AppDescriptorRegistry appDescriptorRegistry, @Named(SystemEventBus.NAME) EventBus systemEventBus, Provider<I18nizer> i18nizerProvider, Provider<AdmincentralModule> oldAdmincentralModule, Provider<info.magnolia.admincentral.AdmincentralModule> newAdmincentralModule) {
          super(appDescriptorRegistry, systemEventBus, i18nizerProvider);
          this.oldAdmincentralModule = oldAdmincentralModule;
          this.newAdmincentralModule = newAdmincentralModule;
      }
  
      @Override
      public void setLayout(AppLauncherLayoutDefinition layout) {
          super.setLayout(mergeLayouts(
                  newAdmincentralModule.get().getAppLauncherLayout(),
                  oldAdmincentralModule.get().getAppLauncherLayout())
          );
      }
  
      AppLauncherLayoutDefinition mergeLayouts(AppLauncherLayoutDefinition newConfig, AppLauncherLayoutDefinition oldConfig) {
          final ConfiguredAppLauncherLayoutDefinition mergedConfig = new ConfiguredAppLauncherLayoutDefinition();
  
          mergedConfig.setDefaultGroup(newConfig.getDefaultGroup() == null ? oldConfig.getDefaultGroup() : newConfig.getDefaultGroup());
  
          mergedConfig.setHiddenApps(Stream.of(newConfig.getHiddenApps(), oldConfig.getHiddenApps())
                  .flatMap(Collection::stream)
                  .collect(Collectors.toList())
          );
  
          Stream<AppLauncherGroupDefinition> oldGroupsMergedWithNewGroups = mergeOldWithNewGroups(newConfig, oldConfig);
          mergedConfig.setGroups(Stream.concat(oldGroupsMergedWithNewGroups, getUniqueGroupsFromNewConfig(newConfig, oldConfig)).collect(Collectors.toList()));
          return mergedConfig;
      }
  
      private Stream<AppLauncherGroupDefinition> getUniqueGroupsFromNewConfig(AppLauncherLayoutDefinition newConfig, AppLauncherLayoutDefinition oldConfig) {
          return newConfig.getGroups().stream().filter(appLauncherGroupDefinition -> !getGroupsFromConfig(oldConfig, appLauncherGroupDefinition.getName()).findFirst().isPresent());
      }
 
     private Stream<AppLauncherGroupDefinition> mergeOldWithNewGroups(AppLauncherLayoutDefinition newConfig, AppLauncherLayoutDefinition oldConfig) {
         return oldConfig.getGroups().stream()
                 .map(oldLauncherGroupDefinition -> {
                     final ConfiguredAppLauncherGroupDefinition groupDefinition = new ConfiguredAppLauncherGroupDefinition();
                     groupDefinition.setName(oldLauncherGroupDefinition.getName());
                     groupDefinition.setLabel(oldLauncherGroupDefinition.getLabel());
                     groupDefinition.setPermissions(oldLauncherGroupDefinition.getPermissions());
                     groupDefinition.setClientGroup(oldLauncherGroupDefinition.isClientGroup());
                     groupDefinition.setColor(oldLauncherGroupDefinition.getColor());
                     groupDefinition.setPermanent(oldLauncherGroupDefinition.isPermanent());
                     groupDefinition.setApps(Stream.concat(
                             getGroupsFromConfig(newConfig, oldLauncherGroupDefinition.getName()),
                             oldLauncherGroupDefinition.getApps().stream()
                     ).collect(Collectors.toList()));
                     return groupDefinition;
                 });
     }
 
     private Stream<AppLauncherGroupEntryDefinition> getGroupsFromConfig(AppLauncherLayoutDefinition newConfig, String groupName) {
         return newConfig.getGroups().stream()
                 .filter(appLauncherGroupDefinition -> appLauncherGroupDefinition.getName().equals(groupName))
                 .flatMap(appLauncherGroupDefinition -> appLauncherGroupDefinition.getApps().stream());
         }
 }