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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.xml;

import static org.jclouds.vcloud.util.Utils.cleanseAttributes;
import static org.jclouds.vcloud.util.Utils.newReferenceType;

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

import javax.inject.Inject;

import org.jclouds.http.functions.ParseSax;
import org.jclouds.vcloud.domain.NetworkConnection;
import org.jclouds.vcloud.domain.NetworkConnectionSection;
import org.jclouds.vcloud.domain.ReferenceType;
import org.xml.sax.Attributes;

import com.google.common.collect.Sets;

/**
 * @author Adrian Cole
 */
public class NetworkConnectionSectionHandler extends ParseSax.HandlerWithResult {
   protected StringBuilder currentText = new StringBuilder();

   private final NetworkConnectionHandler networkConnectionHandler;

   @Inject
   public NetworkConnectionSectionHandler(NetworkConnectionHandler networkConnectionHandler) {
      this.networkConnectionHandler = networkConnectionHandler;
   }

   protected String info;
   protected Set connections = Sets.newLinkedHashSet();
   protected ReferenceType section;
   protected ReferenceType edit;
   protected Integer primaryNetworkConnectionIndex;
   protected boolean inConnections;

   public NetworkConnectionSection getResult() {
      return new NetworkConnectionSection(section.getType(), section.getHref(), info, primaryNetworkConnectionIndex,
               connections, edit);
   }

   @Override
   public void startElement(String uri, String localName, String qName, Attributes attrs) {
      Map attributes = cleanseAttributes(attrs);
      if (qName.endsWith("NetworkConnection")) {
         inConnections = true;
      }
      if (inConnections) {
         networkConnectionHandler.startElement(uri, localName, qName, attrs);
      } else if (qName.endsWith("NetworkConnectionSection")) {
         section = newReferenceType(attributes);
      } else if (qName.endsWith("Link") && "edit".equals(attributes.get("rel"))) {
         edit = newReferenceType(attributes);
      }
   }

   @Override
   public void endElement(String uri, String localName, String qName) {
      if (qName.endsWith("NetworkConnection")) {
         inConnections = false;
         connections.add(networkConnectionHandler.getResult());
      }
      if (inConnections) {
         networkConnectionHandler.endElement(uri, localName, qName);
      } else if (qName.endsWith("Info")) {
         this.info = currentOrNull();
      } else if (qName.endsWith("PrimaryNetworkConnectionIndex")) {
         this.primaryNetworkConnectionIndex = new Integer(currentOrNull());
      }
      currentText = new StringBuilder();
   }

   @Override
   public void characters(char ch[], int start, int length) {
      if (inConnections)
         networkConnectionHandler.characters(ch, start, length);
      else
         currentText.append(ch, start, length);
   }

   protected String currentOrNull() {
      String returnVal = currentText.toString().trim();
      return returnVal.equals("") ? null : returnVal;
   }
}