/*
    * Copyright 2012-2013 smartics, Kronseder & Reiner GmbH
    *
    * Licensed 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 de.smartics.properties.integration.cdi.extension;
  
  import java.util.Iterator;
  import java.util.Set;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import javax.enterprise.event.Observes;
  import javax.enterprise.inject.spi.AfterBeanDiscovery;
  import javax.enterprise.inject.spi.BeanManager;
  import javax.enterprise.inject.spi.Extension;
  
  import de.smartics.exceptions.i18n.AbstractMessageRuntimeException;
  import de.smartics.properties.api.config.app.ConfigurationPropertiesFactory;
  import de.smartics.properties.api.config.app.ConfigurationPropertiesFactoryFactory;
  import de.smartics.properties.api.config.domain.ConfigurationProperties;
  import de.smartics.properties.api.config.domain.ConfigurationPropertiesManagement;
  import de.smartics.properties.api.config.domain.key.ConfigurationKey;
  
  /**
   * The extension that creates the cdi beans for the property types and adds them
   * to the {@link BeanManager}.
   */
  public class SmarticsPropertiesCdiExtension implements Extension
  {
  
    /**
     * The logger for this class.
     */
    private final Logger log = Logger
        .getLogger(SmarticsPropertiesCdiExtension.class.getName());
  
    /**
     * Cdi extension method that gets the {@link AfterBeanDiscovery} event and the
     * {@link BeanManager} injected.
     *
     * @param abd the {@link AfterBeanDiscovery} event.
     * @param manager the {@link BeanManager}.
     * @param configKey the actual (runtime dependent) configuration key.
     */
    public void addSmarticsPropertiesToBeanManager(
        @Observes final AfterBeanDiscovery abd, final BeanManager manager,
        final ConfigurationKey<?> configKey)
    {
      try
      {
  
        final ConfigurationPropertiesFactory factory = createFactory();
  
        abd.addBean(new ConfigurationPropertiesFactoryCdiBean(
            ConfigurationPropertiesFactory.class, manager, factory));
  
        addManagemenAsCdiBeanToBeanMnager(abd, manager, factory);
        addConfigurationPropertiesAsCdiBeanToBeanManager(abd, manager, factory);
        addPropertyTypesAsCdiBeansToBeanManager(abd, manager, factory, configKey);
      }
      catch (final AbstractMessageRuntimeException e)
      {
        log.log(Level.SEVERE, e.getMessage());
        throw e;
      }
  
    }
  
    private void addPropertyTypesAsCdiBeansToBeanManager(
        final AfterBeanDiscovery abd, final BeanManager manager,
        final ConfigurationPropertiesFactory factory,
        final ConfigurationKey<?> configKey)
    {
      final ConfigurationPropertiesManagement configurationManagement =
          factory.createManagement(configKey);
      final Set<Class<?>> propertySetTypes =
          fetchPropertyTypes(configurationManagement);
  
      for (final Iterator<Class<?>> iterator = propertySetTypes.iterator(); iterator
          .hasNext();)
      {
        final Class<?> propertySetType = (Class<?>) iterator.next();
        abd.addBean(new PropertySetTypeCdiBean(propertySetType, manager, factory));
      }
    }
  
    private Set<Class<?>> fetchPropertyTypes(
        final ConfigurationPropertiesManagement configurationManagement)
   {
     final Set<Class<?>> propertySetTypes =
         configurationManagement.getRegistry().getPropertySetTypes();
     return propertySetTypes;
   }
 
   private void addConfigurationPropertiesAsCdiBeanToBeanManager(
       final AfterBeanDiscovery abd, final BeanManager manager,
       final ConfigurationPropertiesFactory factory)
   {
     abd.addBean(new ConfigurationPropertiesCdiBean(
         ConfigurationProperties.class, manager, factory, true));
     abd.addBean(new ConfigurationPropertiesCdiBean(
         ConfigurationProperties.class, manager, factory, false));
   }
 
   private void addManagemenAsCdiBeanToBeanMnager(final AfterBeanDiscovery abd,
       final BeanManager manager, final ConfigurationPropertiesFactory factory)
   {
     abd.addBean(new ConfigurationPropertiesCdiBean(
         ConfigurationPropertiesManagement.class, manager, factory, true));
     abd.addBean(new ConfigurationPropertiesCdiBean(
         ConfigurationPropertiesManagement.class, manager, factory, false));
   }
 
   private ConfigurationPropertiesFactory createFactory()
   {
     final ConfigurationPropertiesFactory factory =
         ConfigurationPropertiesFactoryFactory.createDefaultFactory();
     return factory;
   }
 }