/**
    * This file Copyright (c) 2013-2018 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.contentconnector;
  
  import info.magnolia.event.EventBus;
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.ui.api.app.SubAppContext;
  import info.magnolia.ui.api.app.SubAppDescriptor;
  import info.magnolia.ui.api.app.SubAppEventBus;
  import info.magnolia.ui.api.ioc.SubAppScoped;
  import info.magnolia.ui.contentapp.definition.ContentSubAppDescriptor;
  import info.magnolia.ui.vaadin.integration.contentconnector.ContentConnector;
  import info.magnolia.ui.vaadin.integration.contentconnector.ContentConnectorDefinition;
  import info.magnolia.ui.vaadin.integration.contentconnector.DefaultContentConnector;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Provider;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Provides {@link info.magnolia.ui.vaadin.integration.contentconnector.ContentConnector} to the sub-apps.
   */
  @SubAppScoped
  public class ContentConnectorProvider implements Provider<ContentConnector> {
  
      private static final Logger log = LoggerFactory.getLogger(ContentConnectorProvider.class);
  
      private ComponentProvider provider;
  
      private EventBus subAppEventBus;
  
      private ContentConnector contentConnector;
  
      private SubAppContext ctx;
  
      @Inject
      public ContentConnectorProvider(SubAppContext ctx, final ComponentProvider provider, @Named(SubAppEventBus.NAME) EventBus subAppEventBus) {
          this.ctx = ctx;
          this.provider = provider;
          this.subAppEventBus = subAppEventBus;
      }
  
      @Override
      public ContentConnector get() {
          if (contentConnector == null) {
              SubAppDescriptor subAppDescriptor = ctx.getSubAppDescriptor();
              if (subAppDescriptor instanceof ContentSubAppDescriptor) {
                  ContentConnectorDefinition contentConnectorDefinition = ((ContentSubAppDescriptor) subAppDescriptor).getContentConnector();
                  if (contentConnectorDefinition != null) {
                      contentConnector = provider.newInstance(contentConnectorDefinition.getImplementationClass(), ctx, subAppEventBus, contentConnectorDefinition);
                  } else {
                      log.warn("Sub-app descriptor {} ({}) expected a ContentConnectorDefinition, but no contentConnector is currently configured.", subAppDescriptor.getName(), subAppDescriptor.getClass().getSimpleName());
                  }
              }
          }
          if (contentConnector == null) {
              contentConnector = new DefaultContentConnector(); // Null implementation
          }
          return contentConnector;
      }
  }