/**
    * 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.framework;
  
  import info.magnolia.ui.framework.ioc.ViewComponentProvider;
  import info.magnolia.ui.framework.ioc.ViewContextKeyRegistry;
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.ui.api.ioc.UiContextScoped;
  import info.magnolia.ui.framework.ioc.BeanStore;
  import info.magnolia.ui.framework.ioc.SessionStore;
  import info.magnolia.ui.framework.ioc.UiContextBoundComponentProvider;
  import info.magnolia.ui.framework.ioc.UiContextReference;
  import info.magnolia.util.Util;
  
  import java.util.Objects;
  import java.util.stream.Stream;
  
  import javax.inject.Inject;
  
  /**
   * {@link ViewProvider} implementation.
   */
  @UiContextScoped
  public class ViewProviderImpl implements ViewProvider {
  
      private final UiContextReference currentUiContextReference;
  
      @Inject
      ViewProviderImpl(UiContextReference currentUiContextReference) {
          this.currentUiContextReference = currentUiContextReference;
      }
  
      @Override
      public <V extends UiFrameworkView, D extends ViewDefinition<V>> V create(D definition, Object... args) {
          final Class<? extends V> viewImpl = definition.getImplementationClass();
          final ViewContextKeyRegistry viewContextRegistry = ViewContextKeyRegistry.access();
  
          final UiContextBoundComponentProvider componentProvider = createComponentProvider(definition, args);
          final UiContextReference viewContextReference = componentProvider.getUiContextReference();
          final BeanStore beanStore = SessionStore.access().getBeanStore(viewContextReference);
          Stream.of(args).filter(Objects::nonNull).forEach(arg -> beanStore.put(arg.getClass(), arg));
  
          final V view = componentProvider.newInstance(viewImpl, args);
          viewContextRegistry.register(view, viewContextReference);
          beanStore.put(viewImpl, view);
  
          return view;
      }
  
      private <D extends ViewDefinition> UiContextBoundComponentProvider createComponentProvider(D definition, Object... args) {
          final UiContextReference viewContextReference = generateUniqueViewContextReference(definition, ViewContextKeyRegistry.access());
  
          final BeanStore beanStore = SessionStore.access().createBeanStore(viewContextReference);
  
          Stream.of(args).forEach(arg -> beanStore.put(arg.getClass(), arg));
  
          final ViewComponentProvider viewComponentProvider = new ViewComponentProvider(viewContextReference);
          beanStore.put(ComponentProvider.class, viewComponentProvider);
          beanStore.put(ViewComponentProvider.class, viewComponentProvider);
          beanStore.put(ViewProvider.class, new ViewProviderImpl(viewContextReference));
          beanStore.put(definition.getClass(), definition);
  
          return viewComponentProvider;
      }
  
      private  <V extends UiFrameworkView, D extends ViewDefinition<V>> UiContextReference generateUniqueViewContextReference(D definition, ViewContextKeyRegistry registry) {
          String name = definition.getName();
          UiContextReference viewContextReference;
         do {
             viewContextReference = UiContextReference.ofView(name, currentUiContextReference);
             name = Util.createUniqueName(name);
         } while (registry.isRegistered(viewContextReference));
 
         return viewContextReference;
     }
 }