/**
 *
 * Copyright
 * 2009-2015 Jayway Products AB
 * 2016-2017 Föreningen Sambruk
 *
 * Licensed under AGPL, Version 3.0 (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.gnu.org/licenses/agpl.txt
 *
 * 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 se.streamsource.streamflow.web.domain.generic;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import org.qi4j.api.common.AppliesTo;
import org.qi4j.api.common.AppliesToFilter;
import org.qi4j.api.entity.EntityComposite;
import org.qi4j.api.injection.scope.Structure;
import org.qi4j.api.structure.Module;

import se.streamsource.streamflow.infrastructure.event.domain.DomainEvent;

/**
 * Generic mixin for simple event methods that create an entity and add it to a collection. They have to follow this pattern:
 * SomeType fooCreated(DomainEvent event, String id)
 * This will instantiate an EntityComposite with the "SomeType" type and id "id". The new entity is then returned from the method.
 */
@AppliesTo(EventEntityCreatedMixin.EventEntityCreatedAppliesTo.class)
public class EventEntityCreatedMixin
      implements InvocationHandler
{
   @Structure
   Module module;

   public Object invoke( Object proxy, Method method, Object[] args ) throws Throwable
   {
      // Create entity
      EntityComposite entity = (EntityComposite) module.unitOfWorkFactory().currentUnitOfWork().newEntity( method.getReturnType(), (String) args[1] );

      return entity;
   }

   public static class EventEntityCreatedAppliesTo
         implements AppliesToFilter
   {
      public boolean appliesTo( Method method, Class<?> mixin, Class<?> compositeType, Class<?> fragmentClass )
      {
         return method.getParameterTypes().length == 2 &&
               method.getParameterTypes()[0].equals( DomainEvent.class ) && method.getName().startsWith( "created" ) &&
               !method.getReturnType().equals( Void.TYPE );
      }
   }
}