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   *  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
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   */
  package org.apache.causeway.core.metamodel.facets.param.choices;
  
  import java.util.Optional;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.internal.assertions._Assert;
  import org.apache.causeway.core.metamodel.consent.InteractionInitiatedBy;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.actions.action.choicesfrom.ChoicesFromFacet;
  import org.apache.causeway.core.metamodel.facets.collections.CollectionFacet;
  import org.apache.causeway.core.metamodel.interactions.managed.ActionInteractionHead;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectAction;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectActionParameter;
  import org.apache.causeway.core.metamodel.spec.feature.OneToManyAssociation;
  
  import org.jspecify.annotations.NonNull;
  
  public class ActionParameterChoicesFacetFromAction
  extends ActionParameterChoicesFacetAbstract {
  
      public static Optional<ActionParameterChoicesFacet> create(
              final @NonNull ObjectAction objectAction,
              final @NonNull ObjectSpecification actionOwnerSpec,
              final @NonNull ObjectActionParameter param) {
  
          _Assert.assertFalse(actionOwnerSpec.isMixin(), ()->"framework bug: "
                  + "not meant to be installed on mixin types");
  
          return objectAction.lookupFacet(ChoicesFromFacet.class)
                  .map(ChoicesFromFacet::value)
                  .flatMap(actionOwnerSpec::getCollection)
                  // param type must be assignable from types returned by choices
                  .filter(coll->coll.getElementType().isOfType(param.getElementType()))
                  .map(coll->
                      new ActionParameterChoicesFacetFromAction(coll, param.getFacetHolder()));
      }
  
      private final OneToManyAssociation choicesFromCollection;
  
      private ActionParameterChoicesFacetFromAction(
              final OneToManyAssociation choicesFromCollection,
              final FacetHolder holder) {
          super(holder, Precedence.LOW); // precedence low, so is overridden by imperative facets (member support)
          this.choicesFromCollection = choicesFromCollection;
      }
  
      @Override
      public Can<ManagedObject> getChoices(
              final ObjectSpecification requiredSpec,
              final ActionInteractionHead head,
              final Can<ManagedObject> pendingArgs,
              final InteractionInitiatedBy interactionInitiatedBy) {
  
          var collectionAsObject = choicesFromCollection.get(head.owner(), interactionInitiatedBy);
          return CollectionFacet.streamAdapters(collectionAsObject).collect(Can.toCan());
      }
  
  }
  