/**
    * 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.ioc;
  
  import info.magnolia.ui.framework.datasource.DatasourceHolder;
  import info.magnolia.ui.framework.datasource.DatasourceSupport;
  import info.magnolia.objectfactory.ParameterResolver;
  import info.magnolia.util.OptionalConsumer;
  
  import java.util.Objects;
  import java.util.Optional;
  
  /**
   * Specialised component provider supplied with additional {@link ParameterResolver parameter resolvers}.
   * <ul>
   * <li>{@link ViewContextParameterResolver}</li>
   * <li>{@link DatasourceComponentParameterResolver}</li>
   * </ul>
   */
  public class ViewComponentProvider extends UiContextBoundComponentProvider {
  
      private final UiContextReference viewContextReference;
  
      public ViewComponentProvider(UiContextReference viewContextReference) {
          super(viewContextReference);
          this.viewContextReference = viewContextReference;
      }
  
      @Override
      public <T> T newInstanceWithParameterResolvers(Class<T> type, ParameterResolver... parameters) {
          final ParameterResolver[] combinedParameters = new ParameterResolver[parameters.length + 2];
          combinedParameters[parameters.length] = new ViewContextParameterResolver(viewContextReference);
  
          OptionalConsumer.of(lookupDatasourceDefinition())
                  .ifPresent(datasourceHolder -> combinedParameters[parameters.length + 1] = new DatasourceComponentParameterResolver(getComponent(DatasourceSupport.class), datasourceHolder.getDefinition()))
                  .ifNotPresent(() -> combinedParameters[parameters.length + 1] = parameter -> ParameterResolver.UNRESOLVED);
  
          System.arraycopy(parameters, 0, combinedParameters, 0, parameters.length);
          return super.newInstanceWithParameterResolvers(type, combinedParameters);
      }
  
      private Optional<DatasourceHolder> lookupDatasourceDefinition() {
          final BeanStore beanStore = SessionStore.access().getBeanStore(viewContextReference);
          if (beanStore.hasInstanceOf(DatasourceHolder.class)) {
              return Optional.of(beanStore.get(DatasourceHolder.class));
          }
  
         return viewContextReference.getParentReferences().stream()
                  .map(parentRef -> SessionStore.access().getBeanStore(parentRef))
                  .map(parentStore -> parentStore.getClosestInstance(DatasourceHolder.class))
                  .filter(Objects::nonNull)
                  .map(DatasourceHolder.class::cast)
                  .findFirst();
      }
  }