/**
 * 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.vcloud.xml;

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

import java.util.List;
import java.util.Map;

import javax.inject.Inject;

import org.jclouds.http.functions.ParseSax;
import org.jclouds.util.SaxUtils;
import org.jclouds.vcloud.VCloudMediaType;
import org.jclouds.vcloud.domain.Catalog;
import org.jclouds.vcloud.domain.ReferenceType;
import org.jclouds.vcloud.domain.Task;
import org.jclouds.vcloud.domain.internal.CatalogImpl;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * @author Adrian Cole
 */
public class CatalogHandler extends ParseSax.HandlerWithResult<Catalog> {

   protected final TaskHandler taskHandler;

   @Inject
   public CatalogHandler(TaskHandler taskHandler) {
      this.taskHandler = taskHandler;
   }

   private StringBuilder currentText = new StringBuilder();

   private ReferenceType catalog;
   private Map<String, ReferenceType> contents = Maps.newLinkedHashMap();
   protected List<Task> tasks = Lists.newArrayList();
   private String description;
   private ReferenceType org;

   private boolean published = true;
   private boolean readOnly = true;

   public Catalog getResult() {
      return new CatalogImpl(catalog.getName(), catalog.getType(), catalog.getHref(), org, description, contents,
               tasks, published, readOnly);
   }

   @Override
   public void startElement(String uri, String localName, String qName, Attributes attrs) throws SAXException {
      Map<String, String> attributes = SaxUtils.cleanseAttributes(attrs);
      if (qName.equals("Catalog")) {
         catalog = newReferenceType(attributes, VCloudMediaType.CATALOG_XML);
      } else if (qName.equals("CatalogItem")) {
         putReferenceType(contents, attributes);
      } else if (qName.equals("Link") && "up".equals(attributes.get("rel"))) {
         org = newReferenceType(attributes);
      } else if (qName.equals("Link") && "add".equals(attributes.get("rel"))) {
         readOnly = false;
      } else {
         taskHandler.startElement(uri, localName, qName, attrs);
      }
   }

   public void endElement(String uri, String name, String qName) {
      taskHandler.endElement(uri, name, qName);
      if (qName.equals("Task")) {
         this.tasks.add(taskHandler.getResult());
      } else if (qName.equals("Description")) {
         description = currentOrNull();
      } else if (qName.equals("IsPublished")) {
         published = Boolean.parseBoolean(currentOrNull());
      }
      currentText = new StringBuilder();
   }

   public void characters(char ch[], int start, int length) {
      currentText.append(ch, start, length);
   }

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