package org.apache.helix.webapp.resources;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   */
  
  import java.io.IOException;
  import java.util.List;
  
  import org.apache.helix.HelixException;
  import org.apache.helix.ZNRecord;
  import org.apache.helix.manager.zk.ZkClient;
  import org.apache.helix.model.IdealState.IdealStateModeProperty;
  import org.apache.helix.tools.ClusterSetup;
  import org.apache.helix.webapp.RestAdminApplication;
  import org.apache.log4j.Logger;
  import org.codehaus.jackson.JsonGenerationException;
  import org.codehaus.jackson.map.JsonMappingException;
  import org.restlet.Context;
  import org.restlet.data.MediaType;
  import org.restlet.data.Request;
  import org.restlet.data.Response;
  import org.restlet.data.Status;
  import org.restlet.resource.Representation;
  import org.restlet.resource.Resource;
  import org.restlet.resource.StringRepresentation;
  import org.restlet.resource.Variant;
  
  
  public class ResourceGroupsResource extends Resource
  {
    private final static Logger LOG = Logger.getLogger(ResourceGroupsResource.class);
  
    public ResourceGroupsResource(Context context, Request request, Response response)
    {
      super(context, request, response);
      getVariants().add(new Variant(MediaType.TEXT_PLAIN));
      getVariants().add(new Variant(MediaType.APPLICATION_JSON));
    }
  
    @Override
    public boolean allowGet()
    {
      return true;
    }
  
    @Override
    public boolean allowPost()
    {
      return true;
    }
  
    @Override
    public boolean allowPut()
    {
      return false;
    }
  
    @Override
    public boolean allowDelete()
    {
      return false;
    }
  
    @Override
    public Representation represent(Variant variant)
    {
      StringRepresentation presentation = null;
      try
      {
        String clusterName = (String) getRequest().getAttributes().get("clusterName");
        presentation = getHostedEntitiesRepresentation(clusterName);
      }
  
      catch (Exception e)
      {
        String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
        presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
  
        LOG.error("", e);
      }
      return presentation;
    }
  
   StringRepresentation getHostedEntitiesRepresentation(String clusterName) throws JsonGenerationException,
       JsonMappingException,
       IOException
   {
     ZkClient zkClient =
         (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
     ;
     ClusterSetup setupTool = new ClusterSetup(zkClient);
     List<String> hostedEntities =
         setupTool.getClusterManagementTool().getResourcesInCluster(clusterName);
 
     ZNRecord hostedEntitiesRecord = new ZNRecord("ResourceGroups");
     hostedEntitiesRecord.setListField("ResourceGroups", hostedEntities);
 
     StringRepresentation representation =
         new StringRepresentation(ClusterRepresentationUtil.ZNRecordToJson(hostedEntitiesRecord),
                                  MediaType.APPLICATION_JSON);
 
     return representation;
   }
 
   @Override
   public void acceptRepresentation(Representation entity)
   {
     try
     {
       String clusterName = (String) getRequest().getAttributes().get("clusterName");
 
       JsonParameters jsonParameters = new JsonParameters(entity);
       String command = jsonParameters.getCommand();
 
       if (command.equalsIgnoreCase(ClusterSetup.addResource)
           || JsonParameters.CLUSTERSETUP_COMMAND_ALIASES.get(ClusterSetup.addResource)
                                                         .contains(command))
       {
         jsonParameters.verifyCommand(ClusterSetup.addResource);
 
         String entityName =
             jsonParameters.getParameter(JsonParameters.RESOURCE_GROUP_NAME);
         String stateModelDefRef =
             jsonParameters.getParameter(JsonParameters.STATE_MODEL_DEF_REF);
         int partitions =
             Integer.parseInt(jsonParameters.getParameter(JsonParameters.PARTITIONS));
         String mode = IdealStateModeProperty.AUTO.toString();
         if (jsonParameters.getParameter(JsonParameters.IDEAL_STATE_MODE) != null)
         {
           mode = jsonParameters.getParameter(JsonParameters.IDEAL_STATE_MODE);
         }
         
         int bucketSize = 0;
         if (jsonParameters.getParameter(JsonParameters.BUCKET_SIZE) != null)
         {
           try
           {
             bucketSize = Integer.parseInt(jsonParameters.getParameter(JsonParameters.BUCKET_SIZE));
           }
           catch(Exception e)
           {
             
           }
         }
         
         int maxPartitionsPerNode = -1;
         if (jsonParameters.getParameter(JsonParameters.MAX_PARTITIONS_PER_NODE) != null)
         {
           try
           {
             maxPartitionsPerNode = Integer.parseInt(jsonParameters.getParameter(JsonParameters.MAX_PARTITIONS_PER_NODE));
           }
           catch(Exception e)
           {
             
           }
         }
 
         ZkClient zkClient =
             (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
         ;
         ClusterSetup setupTool = new ClusterSetup(zkClient);
         setupTool.addResourceToCluster(clusterName,
                                        entityName,
                                        partitions,
                                        stateModelDefRef,
                                        mode,
                                        bucketSize,
                                        maxPartitionsPerNode
                                        );
       }
       else
       {
         throw new HelixException("Unsupported command: " + command
             + ". Should be one of [" + ClusterSetup.addResource + "]");
 
       }
 
       getResponse().setEntity(getHostedEntitiesRepresentation(clusterName));
       getResponse().setStatus(Status.SUCCESS_OK);
     }
 
     catch (Exception e)
     {
       getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e),
                               MediaType.APPLICATION_JSON);
       getResponse().setStatus(Status.SUCCESS_OK);
       LOG.error("Error in posting " + entity, e);
     }
   }
 }