/**
 * 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.cloudstack.functions;

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

import java.util.Map;
import java.util.Set;

import javax.inject.Singleton;

import org.jclouds.http.HttpResponse;
import org.jclouds.http.functions.ParseFirstJsonValueNamed;
import org.jclouds.json.internal.GsonWrapper;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap.Builder;
import com.google.common.collect.ImmutableSortedMap;
import com.google.inject.Inject;
import com.google.inject.TypeLiteral;

/**
 * 
 * @author Adrian Cole
 */
@Singleton
public class ParseIdToNameFromHttpResponse implements Function<HttpResponse, Map<Long, String>> {
   private final ParseFirstJsonValueNamed<Set<IdName>> parser;

   private static class IdName {
      private long id;
      private String name;

      @Override
      public int hashCode() {
         final int prime = 31;
         int result = 1;
         result = prime * result + (int) (id ^ (id >>> 32));
         result = prime * result + ((name == null) ? 0 : name.hashCode());
         return result;
      }

      @Override
      public boolean equals(Object obj) {
         if (this == obj)
            return true;
         if (obj == null)
            return false;
         if (getClass() != obj.getClass())
            return false;
         IdName other = (IdName) obj;
         if (id != other.id)
            return false;
         if (name == null) {
            if (other.name != null)
               return false;
         } else if (!name.equals(other.name))
            return false;
         return true;
      }

   }

   @Inject
   public ParseIdToNameFromHttpResponse(GsonWrapper gsonWrapper) {
      this.parser = new ParseFirstJsonValueNamed<Set<IdName>>(checkNotNull(gsonWrapper, "gsonWrapper"),
            new TypeLiteral<Set<IdName>>() {
            }, "oscategory");
   }

   public Map<Long, String> apply(HttpResponse response) {
      checkNotNull(response, "response");
      Set<IdName> toParse = parser.apply(response);
      checkNotNull(toParse, "parsed result from %s", response);
      Builder<Long, String> builder = ImmutableSortedMap.<Long, String> naturalOrder();
      for (IdName entry : toParse)
         builder.put(entry.id, entry.name);
      return builder.build();
   }
}
