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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.terremark.compute.functions;

import static com.google.common.base.Preconditions.checkNotNull;

import java.net.URI;

import javax.annotation.Resource;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.jclouds.compute.reference.ComputeServiceConstants;
import org.jclouds.http.HttpResponseException;
import org.jclouds.logging.Logger;
import org.jclouds.util.Utils;
import org.jclouds.vcloud.terremark.TerremarkVCloudClient;
import org.jclouds.vcloud.terremark.compute.domain.OrgAndName;
import org.jclouds.vcloud.terremark.domain.KeyPair;

import com.google.common.base.Function;
import com.google.common.base.Supplier;

/**
 * 
 * @author Adrian Cole
 */
@Singleton
public class CreateUniqueKeyPair implements Function {
   @Resource
   @Named(ComputeServiceConstants.COMPUTE_LOGGER)
   protected Logger logger = Logger.NULL;
   protected final TerremarkVCloudClient trmkClient;
   protected Supplier randomSuffix;

   @Inject
   CreateUniqueKeyPair(TerremarkVCloudClient trmkClient, Supplier randomSuffix) {
      this.trmkClient = trmkClient;
      this.randomSuffix = randomSuffix;
   }

   @Override
   public KeyPair apply(OrgAndName from) {
      return createNewKeyPairInOrg(from.getOrg(), from.getName());
   }

   private KeyPair createNewKeyPairInOrg(URI org, String keyPairName) {
      checkNotNull(org, "org");
      checkNotNull(keyPairName, "keyPairName");
      logger.debug(">> creating keyPair org(%s) name(%s)", org, keyPairName);
      KeyPair keyPair = null;
      while (keyPair == null) {
         try {
            keyPair = trmkClient.generateKeyPairInOrg(org, getNextName(keyPairName), false);
            logger.debug("<< created keyPair(%s)", keyPair.getName());
         } catch (RuntimeException e) {
            HttpResponseException ht = Utils.getFirstThrowableOfType(e, HttpResponseException.class);
            if (ht == null || ht.getContent() == null
                  || ht.getContent().indexOf("Security key with same name exists") == -1)
               throw e;
         }
      }
      return keyPair;
   }

   private String getNextName(String keyPairName) {
      return "jclouds#" + keyPairName + "#" + randomSuffix.get();
   }
}