/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.jclouds.compute;

import java.util.Properties;

import org.jclouds.compute.config.ResolvesImages;
import org.jclouds.compute.internal.ComputeServiceContextImpl;
import org.jclouds.rest.RestContextBuilder;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.util.Types;

/**
 * @author Adrian Cole
 */
public abstract class ComputeServiceContextBuilder<S, A> extends RestContextBuilder<S, A> {

   public ComputeServiceContextBuilder(Class<S> syncClientType, Class<A> asyncClientType) {
      this(syncClientType, asyncClientType, new Properties());
   }

   public ComputeServiceContextBuilder(Class<S> syncClientType, Class<A> asyncClientType,
            Properties properties) {
      super(syncClientType, asyncClientType, properties);

   }

   @Override
   public Injector buildInjector() {
      addImageResolutionModuleIfNotPresent();
      return super.buildInjector();
   }

   /**
    * {@inheritDoc}
    */
   @Override
   public ComputeServiceContextBuilder<S, A> withModules(Iterable<Module> modules) {
      return (ComputeServiceContextBuilder<S, A>) super.withModules(modules);
   }

   public ComputeServiceContext buildComputeServiceContext() {
      // need the generic type information
      return (ComputeServiceContext) buildInjector().getInstance(
               Key.get(Types.newParameterizedType(ComputeServiceContextImpl.class, syncClientType,
                        asyncClientType)));
   }

   protected void addImageResolutionModuleIfNotPresent() {
      if (!Iterables.any(modules, new Predicate<Module>() {
         public boolean apply(Module input) {
            return input.getClass().isAnnotationPresent(ResolvesImages.class);
         }

      })) {
         addImageResolutionModule();
      }
   }

   protected void addImageResolutionModule() {
      // do nothing;
      // this is to be overridden when needed
   }
}