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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. 
 *
 * ====================================================================
 * 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 org.jclouds.vcloud.functions;

import static com.google.common.collect.Iterables.filter;
import static com.google.common.collect.Iterables.transform;
import static org.jclouds.concurrent.FutureIterables.transformParallel;

import java.net.URI;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;

import javax.annotation.Resource;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.jclouds.Constants;
import org.jclouds.compute.reference.ComputeServiceConstants;
import org.jclouds.domain.Location;
import org.jclouds.domain.LocationScope;
import org.jclouds.logging.Logger;
import org.jclouds.vcloud.CommonVCloudAsyncClient;
import org.jclouds.vcloud.domain.Org;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Sets;

/**
 * @author Adrian Cole
 */
@Singleton
public class OrgsForLocations implements Function, Iterable> {
   @Resource
   @Named(ComputeServiceConstants.COMPUTE_LOGGER)
   public Logger logger = Logger.NULL;
   private final CommonVCloudAsyncClient aclient;
   private final ExecutorService executor;

   @Inject
   OrgsForLocations(CommonVCloudAsyncClient aclient, @Named(Constants.PROPERTY_USER_THREADS) ExecutorService executor) {
      this.aclient = aclient;
      this.executor = executor;
   }

   /**
    * Zones are assignable, but we want regions. so we look for zones, whose
    * parent is region. then, we use a set to extract the unique set.
    */
   @Override
   public Iterable apply(Iterable from) {

      return transformParallel(Sets.newLinkedHashSet(transform(filter(from, new Predicate() {

         @Override
         public boolean apply(Location input) {
            return input.getScope() == LocationScope.ZONE;
         }

      }), new Function() {

         @Override
         public URI apply(Location from) {
            return URI.create(from.getParent().getId());
         }

      })), new Function>() {

         @SuppressWarnings("unchecked")
         @Override
         public Future apply(URI from) {
            return (Future) aclient.getOrg(from);
         }

      }, executor, null, logger, "organizations for uris");
   }

}