/**
    * This file Copyright (c) 2011-2015 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.objectfactory.guice;
  
  import info.magnolia.objectfactory.CandidateParameterResolver;
  import info.magnolia.objectfactory.ComponentFactory;
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.objectfactory.NoSuchComponentException;
  import info.magnolia.objectfactory.ObjectManufacturer;
  import info.magnolia.objectfactory.ParameterResolver;
  
  import java.util.Arrays;
  import java.util.Map;
  
  import javax.inject.Inject;
  import javax.inject.Provider;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.Injector;
  
  
  /**
   * ComponentProvider implementation based on Guice.
   *
   * @see ComponentProvider
   * @see GuiceComponentProviderBuilder
   */
  public class GuiceComponentProvider implements ComponentProvider {
  
      private static Logger logger = LoggerFactory.getLogger(GuiceComponentProvider.class);
  
      @Inject
      private Injector injector;
      private ObjectManufacturer manufacturer;
      private final Map<Class<?>, Class<?>> typeMappings;
      private final GuiceComponentProvider parentComponentProvider;
  
      public GuiceComponentProvider(Map<Class<?>, Class<?>> typeMappings, GuiceComponentProvider parentComponentProvider) {
          this.parentComponentProvider = parentComponentProvider;
          this.typeMappings = typeMappings;
      }
  
      @Override
      public <T> Class<? extends T> getImplementation(Class<T> type) {
          Class<?> implementation = typeMappings.get(type);
          if (implementation == null) {
              if (parentComponentProvider != null) {
                  return parentComponentProvider.getImplementation(type);
              }
              return type;
          }
          if (ComponentFactory.class.isAssignableFrom(implementation)) {
              return type;
          }
          return (Class<? extends T>) implementation;
      }
  
      @Override
      @Deprecated
      public <T> T getSingleton(Class<T> type) {
          return getComponent(type);
      }
  
      @Override
      public <T> T getComponent(Class<T> type) throws NoSuchComponentException {
          if (!GuiceUtils.hasExplicitBindingFor(injector, type)) {
             throw new NoSuchComponentException("No component configuration for type [" + type.getName() + "] found. Please add a configuration to your module descriptor.");
         }
         return injector.getInstance(type);
     }
 
     @Override
     public <T> T newInstance(Class<T> type, Object... parameters) {
         return newInstanceWithParameterResolvers(type, new CandidateParameterResolver(parameters));
     }
 
     @Override
     public <T> T newInstanceWithParameterResolvers(Class<T> type, ParameterResolver... parameterResolvers) {
         if (this.manufacturer == null) {
             this.manufacturer = new ObjectManufacturer();
         }
         Class<? extends T> implementation = getImplementation(type);
         if (implementation == null) {
             logger.warn("Failed to resolve implementation for {}. Perhaps it is not defined. The only types defined for this container are {}.", type, typeMappings);
         }
 
         parameterResolvers = concat(parameterResolvers, new GuiceParameterResolver(injector));
         T instance = (T) manufacturer.newInstance(implementation, parameterResolvers);
         injectMembers(instance);
         return instance;
     }
 
     private ParameterResolver[] concat(ParameterResolver[] array, ParameterResolver extra) {
         ParameterResolver[] newArray = Arrays.copyOf(array, array.length + 1);
         newArray[array.length] = extra;
         return newArray;
     }
 
     public Injector getInjector() {
         return injector;
     }
 
     public <T> Provider<T> getProvider(Class<T> type) {
         if (!GuiceUtils.hasExplicitBindingFor(injector, type)) {
             return null;
         }
         return injector.getProvider(type);
     }
 
     public void injectMembers(Object instance) {
         injector.injectMembers(instance);
     }
 
     public void destroy() {
         /*
 
        Destroy using @PreDestroy is disabled because the implementation acquires instances for lazy-init singletons
        only to destroy them. It also tries to acquire instances that have non-existing scopes leading to exceptions
        being thrown. This usually results in shutdown of the application being interrupted before having a chance to
        properly close down JackRabbit. With (at least) the derby persistence manager this results in threads not being
        closed down properly and therefore Tomcat stalls at shutdown.
 
         */
     }
 
     @Override
     public GuiceComponentProvider getParent() {
         return parentComponentProvider;
     }
 }