/*
 * Copyright © 2015 Cask Data, Inc.
 *
 * 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 co.cask.cdap.cli.command;

import co.cask.cdap.cli.ArgumentName;
import co.cask.cdap.cli.ElementType;
import co.cask.cdap.client.NamespaceClient;
import co.cask.cdap.proto.Id;
import co.cask.common.cli.Arguments;
import co.cask.common.cli.Command;
import com.google.inject.Inject;

import java.io.PrintStream;

/**
 * {@link Command} to delete a namespace.
 */
public class DeleteNamespaceCommand implements Command {
  private static final String SUCCESS_MSG = "Namespace '%s' deleted successfully.";
  private final NamespaceClient namespaceClient;

  @Inject
  public DeleteNamespaceCommand(NamespaceClient namespaceClient) {
    this.namespaceClient = namespaceClient;
  }

  @Override
  public void execute(Arguments arguments, PrintStream out) throws Exception {
    Id.Namespace namespaceId = Id.Namespace.from(arguments.get(ArgumentName.NAMESPACE_ID.toString()));
    namespaceClient.delete(namespaceId.getId());
    out.println(String.format(SUCCESS_MSG, namespaceId));
  }

  @Override
  public String getPattern() {
    return String.format("delete namespace <%s>", ArgumentName.NAMESPACE_ID);
  }

  @Override
  public String getDescription() {
    return String.format("Deletes a %s.", ElementType.NAMESPACE.getPrettyName());
  }
}

@@ -664,16 +664,51 @@
 ntName;%0A
+import co.cask.cdap.cli.CLIConfig;%0A
 import c
@@ -780,16 +780,59 @@
 Client;%0A
+import co.cask.cdap.common.conf.Constants;%0A
 import c
@@ -1227,16 +1227,53 @@
 eClient;
+%0A  private final CLIConfig cliConfig;
 %0A%0A  @Inj
@@ -1308,16 +1308,37 @@
 Command(
+CLIConfig cliConfig, 
 Namespac
@@ -1360,24 +1360,56 @@
 ceClient) %7B%0A
+    this.cliConfig = cliConfig;%0A
     this.nam
@@ -1742,24 +1742,269 @@
 espaceId));%0A
+    if (cliConfig.getCurrentNamespace().equals(namespaceId)) %7B%0A      cliConfig.setCurrentNamespace(Constants.DEFAULT_NAMESPACE_ID);%0A      out.printf(%22Now using namespace '%25s'%22, Constants.DEFAULT_NAMESPACE_ID.getId());%0A      out.println();%0A    %7D%0A
   %7D%0A%0A  @Over

Use default namespace when current namespace is deleted in CLI