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/**
 * 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.compute.functions;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Throwables.propagate;
import static java.lang.String.format;
import static org.jclouds.compute.config.ComputeServiceProperties.TIMEOUT_NODE_RUNNING;
import static org.jclouds.compute.util.ComputeServiceUtils.formatStatus;

import java.util.concurrent.atomic.AtomicReference;

import javax.inject.Inject;
import javax.inject.Named;

import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.domain.NodeMetadata.Status;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Stopwatch;

/**
 * Polls until the node is running or throws {@link IllegalStateException} if
 * this cannot be achieved within the timeout.
 *
 * @author Adrian Cole
 *
 */
@Named(TIMEOUT_NODE_RUNNING)
public class PollNodeRunning implements Function, AtomicReference> {
   private final Predicate> nodeRunning;

   @Inject
   public PollNodeRunning(@Named(TIMEOUT_NODE_RUNNING) Predicate> nodeRunning) {
      this.nodeRunning = checkNotNull(nodeRunning, "nodeRunning");
   }

   /**
    * @param node
    *           will be updated with the node which is running
    * @throws {@link IllegalStateException} if this cannot be achieved within
    *         the timeout.
    */
   @Override
   public AtomicReference apply(AtomicReference node) throws IllegalStateException {
      String originalId = node.get().getId();
      NodeMetadata originalNode = node.get();
      try {
         Stopwatch stopwatch = new Stopwatch().start();
         if (!nodeRunning.apply(node)) {
            long timeWaited = stopwatch.elapsedMillis();
            if (node.get() == null) {
               node.set(originalNode);
               throw new IllegalStateException(format("api response for node(%s) was null", originalId));
            } else {
               throw new IllegalStateException(format(
                     "node(%s) didn't achieve the status running; aborting after %d seconds with final status: %s",
                     originalId, timeWaited / 1000, formatStatus(node.get())));
            }
         }
      } catch (IllegalStateException e) {
         if (node.get().getStatus() == Status.TERMINATED) {
            throw new IllegalStateException(format("node(%s) terminated", originalId));
         } else {
            throw propagate(e);
         }
      }
      return node;
   }
}