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/*
 * 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.
 */
package org.jclouds.virtualbox.functions;

import static org.virtualbox_4_2.NetworkAttachmentType.NAT;

import org.jclouds.virtualbox.domain.NetworkInterfaceCard;
import org.jclouds.virtualbox.domain.RedirectRule;
import org.virtualbox_4_2.IMachine;
import org.virtualbox_4_2.INetworkAdapter;
import org.virtualbox_4_2.VBoxException;

import com.google.common.base.Function;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;

public class AttachNATAdapterToMachineIfNotAlreadyExists implements Function {

   private NetworkInterfaceCard networkInterfaceCard;

   public AttachNATAdapterToMachineIfNotAlreadyExists(NetworkInterfaceCard networkInterfaceCard) {
      this.networkInterfaceCard = networkInterfaceCard;
   }

   @Override
   public Void apply(IMachine machine) {
      INetworkAdapter iNetworkAdapter = machine.getNetworkAdapter(networkInterfaceCard.getSlot());
      // clean up previously set rules
      for (String redirectRule : iNetworkAdapter.getNATEngine().getRedirects()) {
         String redirectRuleName = Iterables.getFirst(Splitter.on(",").split(redirectRule), null);
         if (redirectRuleName != null) {
            iNetworkAdapter.getNATEngine().removeRedirect(redirectRuleName);
         }
      }
      iNetworkAdapter.setAttachmentType(NAT);
      for (RedirectRule rule : networkInterfaceCard.getNetworkAdapter().getRedirectRules()) {
         try {
            String ruleName = String.format("%s@%s:%s->%s:%s", rule.getProtocol(), rule.getHost(), rule.getHostPort(), 
                     rule.getGuest(), rule.getGuestPort());
            iNetworkAdapter.getNATEngine().addRedirect(ruleName, rule.getProtocol(), rule.getHost(), rule.getHostPort(),
                     rule.getGuest(), rule.getGuestPort());
         } catch (VBoxException e) {
            if (!e.getMessage().contains("already exists"))
               throw e;
         }
      }
      iNetworkAdapter.setEnabled(networkInterfaceCard.isEnabled());
      machine.saveSettings();
      return null;
   }
}