/**
 * 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.trmk.vcloud_0_8.functions;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

import java.net.URI;
import java.util.Map;
import java.util.NoSuchElementException;

import javax.inject.Inject;

import org.jclouds.trmk.vcloud_0_8.domain.ReferenceType;
import org.jclouds.trmk.vcloud_0_8.domain.VDC;
import org.jclouds.trmk.vcloud_0_8.endpoints.Org;

import com.google.common.base.Function;
import com.google.common.base.Supplier;
import com.google.common.collect.Iterables;
/**
 * 
 * @author Adrian Cole
 */
public abstract class OrgNameVDCNameResourceNameToEndpoint  implements Function<Object, URI>{

   protected final Supplier<Map<String, Map<String, ? extends org.jclouds.trmk.vcloud_0_8.domain.VDC>>> orgVDCMap;
   protected final ReferenceType defaultOrg;
   protected final ReferenceType defaultVDC;

   @Inject
   public OrgNameVDCNameResourceNameToEndpoint(
         Supplier<Map<String, Map<String, ? extends org.jclouds.trmk.vcloud_0_8.domain.VDC>>> orgVDCMap,
         @Org ReferenceType defaultOrg, @org.jclouds.trmk.vcloud_0_8.endpoints.VDC ReferenceType defaultVDC) {
      this.orgVDCMap = orgVDCMap;
      this.defaultOrg = defaultOrg;
      this.defaultVDC = defaultVDC;
   }

   @SuppressWarnings("unchecked")
   public URI apply(Object from) {
      Iterable<Object> orgVDC = (Iterable<Object>) checkNotNull(from, "args");
      Object org = Iterables.get(orgVDC, 0);
      Object vDC = Iterables.get(orgVDC, 1);
      Object resource = Iterables.get(orgVDC, 2);
      if (org == null)
         org = defaultOrg.getName();
      if (vDC == null)
         vDC = defaultVDC.getName();
      Map<String, Map<String, ? extends org.jclouds.trmk.vcloud_0_8.domain.VDC>> orgToVDCs = orgVDCMap.get();
      checkState(orgToVDCs != null, "could not get map of org name to vdcs!");
      Map<String, ? extends org.jclouds.trmk.vcloud_0_8.domain.VDC> vDCs = orgToVDCs.get(org);
      if (vDCs == null)
         throw new NoSuchElementException("org " + org + " not found in " + orgToVDCs.keySet());
      org.jclouds.trmk.vcloud_0_8.domain.VDC vDCObject = vDCs.get(vDC);
      if (vDCObject == null)
         throw new NoSuchElementException("vdc " + vDC + " in org " + org + " not found in " + vDCs.keySet());
      return getEndpointOfResourceInVDC(org, vDC, resource, vDCObject);
   }

   protected abstract URI getEndpointOfResourceInVDC(Object org, Object vDC, Object resource, VDC vDCObject);

}