/*
    * 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.myfaces.flow.cdi;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import javax.enterprise.event.Observes;
  import javax.enterprise.inject.spi.AfterBeanDiscovery;
  import javax.enterprise.inject.spi.AfterDeploymentValidation;
  import javax.enterprise.inject.spi.AnnotatedType;
  import javax.enterprise.inject.spi.BeanManager;
  import javax.enterprise.inject.spi.BeforeBeanDiscovery;
  import javax.enterprise.inject.spi.Extension;
  import javax.enterprise.inject.spi.ProcessBean;
  import javax.faces.flow.FlowScoped;
  import org.apache.myfaces.flow.FlowReference;
  
  /**
   *
   * @author Leonardo Uribe
   */
  public class FlowScopeCDIExtension implements Extension
  {
      private FlowScopedContextImpl flowScopedContext;
      
      private Map<Class, FlowReference> flowBeanReferences;
      
      public FlowScopeCDIExtension()
      {
          flowBeanReferences = new ConcurrentHashMap<Class, FlowReference>();
      }
      
      void beforeBeanDiscovery(
          @Observes final BeforeBeanDiscovery event, BeanManager beanManager)
      {
          event.addScope(FlowScoped.class, true, true);
          // Register FlowBuilderFactoryBean as a bean with CDI annotations, so the system
          // can take it into account, and use it later when necessary.
          AnnotatedType bean = beanManager.createAnnotatedType(FlowScopeBeanHolder.class);
          event.addAnnotatedType(bean);
      }
      
      void onProcessBean(@Observes ProcessBean event, BeanManager manager)
      {
          // Register all beans who are annotated with FlowScoped and has a flow reference
          // restriction, to take it into account later when it is created and store it
          // in the right context so @PreDestroy is called when the referenced flow is.
          if (event.getAnnotated().isAnnotationPresent(FlowScoped.class))
          {
              FlowScoped flowScoped = event.getAnnotated().getAnnotation(FlowScoped.class);
              String flowId = flowScoped.value();
              if (flowId != null)
              {
                  flowBeanReferences.put(event.getBean().getBeanClass(), new FlowReference(
                      flowScoped.definingDocumentId(), flowId));
              }
          }
      }
      
      void afterBeanDiscovery(@Observes AfterBeanDiscovery event, BeanManager manager)
      {
          flowScopedContext = new FlowScopedContextImpl(manager, flowBeanReferences);
          event.addContext(flowScopedContext);
      }
      
      void initializeFlowContexts(@Observes AfterDeploymentValidation adv, BeanManager beanManager)
      {
          //FlowScopeBeanHolder flowScopeBeanHolder = BeanProvider.getContextualReference(
          //    beanManager, FlowScopeBeanHolder.class, false);
          
          //flowScopedContext.initFlowContext(flowScopeBeanHolder);
      }
  }