content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package org.apache.causeway.core.metamodel.facets.object.domainobjectlayout;
  
  import java.util.Optional;
  import java.util.function.BiConsumer;
  
  import org.apache.causeway.applib.annotation.DomainObjectLayout;
  import org.apache.causeway.applib.events.EventObjectBase;
  import org.apache.causeway.applib.events.ui.CssClassUiEvent;
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.members.cssclass.CssClassFacet;
  import org.apache.causeway.core.metamodel.facets.members.cssclass.CssClassFacetAbstract;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.object.ManagedObjects;
  import org.apache.causeway.core.metamodel.object.MmEventUtils;
  import org.apache.causeway.core.metamodel.services.events.MetamodelEventService;
  
  public class CssClassFacetViaDomainObjectLayoutAnnotationUsingCssClassUiEvent
  extends CssClassFacetAbstract {
  
      public static Optional<CssClassFacetViaDomainObjectLayoutAnnotationUsingCssClassUiEvent> create(
              final Optional<DomainObjectLayout> domainObjectLayoutIfAny,
              final MetamodelEventService metamodelEventService,
              final FacetHolder facetHolder) {
  
          return domainObjectLayoutIfAny
          .map(DomainObjectLayout::cssClassUiEvent)
          .filter(cssClassUiEventClass -> MmEventUtils.eventTypeIsPostable(
                  cssClassUiEventClass,
                  CssClassUiEvent.Noop.class,
                  CssClassUiEvent.Default.class,
                  facetHolder.getConfiguration().getApplib().getAnnotation()
                      .getDomainObjectLayout().getCssClassUiEvent().isPostForDefault()))
          .map(cssClassUiEventClass -> {
              return new CssClassFacetViaDomainObjectLayoutAnnotationUsingCssClassUiEvent(
                      cssClassUiEventClass, metamodelEventService, facetHolder);
          });
  
      }
  
      private final Class<? extends CssClassUiEvent<Object>> cssClassUiEventClass;
      private final MetamodelEventService metamodelEventService;
  
      private CssClassFacetViaDomainObjectLayoutAnnotationUsingCssClassUiEvent(
              final Class<? extends CssClassUiEvent<?>> cssClassUiEventClass,
              final MetamodelEventService metamodelEventService,
              final FacetHolder holder) {
  
          super(holder, Precedence.EVENT);
          this.cssClassUiEventClass = _Casts.uncheckedCast(cssClassUiEventClass);
          this.metamodelEventService = metamodelEventService;
      }
  
      @Override
      public String cssClass(final ManagedObject owningAdapter) {
  
          if(ManagedObjects.isNullOrUnspecifiedOrEmpty(owningAdapter)) {
              return null;
          }
  
          final CssClassUiEvent<Object> cssClassUiEvent = newCssClassUiEvent(owningAdapter);
  
          metamodelEventService.fireCssClassUiEvent(cssClassUiEvent);
  
          final String cssClass = cssClassUiEvent.getCssClass();
  
          if(cssClass == null) {
              // ie no subscribers out there...
  
              final CssClassFacet underlyingCssClassFacet = getSharedFacetRanking()
              .flatMap(facetRanking->facetRanking.getWinnerNonEvent(CssClassFacet.class))
              .orElse(null);
  
              if(underlyingCssClassFacet!=null) {
                  return underlyingCssClassFacet.cssClass(owningAdapter);
              }
          }
  
          return cssClass;
      }
  
      private CssClassUiEvent<Object> newCssClassUiEvent(final ManagedObject owningAdapter) {
          final Object domainObject = owningAdapter.getPojo();
          return newCssClassUiEventForPojo(domainObject);
      }
  
      private CssClassUiEvent<Object> newCssClassUiEventForPojo(final Object domainObject) {
          return EventObjectBase.getInstanceWithSource(cssClassUiEventClass, domainObject).orElseThrow();
      }
  
      @Override
      public void visitAttributes(final BiConsumer<String, Object> visitor) {
          super.visitAttributes(visitor);
          visitor.accept("cssClassUiEventClass", cssClassUiEventClass);
      }
  }
  