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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;

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

import org.jclouds.compute.domain.Template;
import org.jclouds.domain.LoginCredentials;
import org.jclouds.javax.annotation.Nullable;

/**
 * A means of specifying the interface between the {@link ComputeService
 * ComputeServices} and a concrete compute cloud implementation, jclouds or
 * otherwise.
 * 
 * @author Adrian Cole
 * 
 */
public interface ComputeServiceAdapter {

   /**
    * {@link ComputeService#createNodesInGroup(String, int, Template)} generates
    * the parameters passed into this method such that each node in the set has
    * a unique name.
    * 
    * note It is intentional to return the library native node object,
    * as generic type {@code N}. If you are not using library-native objects
    * (such as libvirt {@code Domain}) use
    * {@link JCloudsNativeComputeServiceAdapter} instead.
    * 
    * note Your responsibility is to create a node with the underlying
    * library and return after storing its credentials in the supplied map
    * corresponding to {@link ComputeServiceContext#getCredentialStore
    * credentialStore}
    * 
    * @param tag
    *           used to aggregate nodes with identical configuration
    * @param name
    *           unique supplied name for the node, which has the tag encoded
    *           into it.
    * @param template
    *           includes {@code imageId}, {@code locationId}, and
    *           {@code hardwareId} used to resume the instance.
    * @return library-native representation of a node.
    * TODO: return typed exception on createNodeFailure
    * @see ComputeService#createNodesInGroup(String, int, Template)
    */
   NodeAndInitialCredentials createNodeWithGroupEncodedIntoName(String tag, String name, Template template);

   public static class NodeAndInitialCredentials {
      private final N node;
      private final String nodeId;
      private final LoginCredentials credentials;

      public NodeAndInitialCredentials(N node, String nodeId, @Nullable LoginCredentials credentials) {
         this.node = checkNotNull(node, "node");
         this.nodeId = checkNotNull(nodeId, "nodeId");
         this.credentials = credentials;
      }

      /**
       * 
       * @return cloud specific representation of the newly created node
       */
      public N getNode() {
         return node;
      }

      /**
       * 
       * @return Stringifed version of the new node's id.
       */
      public String getNodeId() {
         return nodeId;
      }

      /**
       * 
       * @return credentials given by the api for the node, or null if this
       *         information is not available
       */
      @Nullable
      public LoginCredentials getCredentials() {
         return credentials;
      }
   }

   /**
    * Hardware profiles describe available cpu, memory, and disk configurations
    * that can be used to run a node.
    * 
    * To implement this method, return the library native hardware profiles
    * available to the user. These will be used to launch nodes as a part of the
    * template.
    * 
    * @return a non-null iterable of available hardware profiles.
    * @see ComputeService#listHardwareProfiles()
    */
   Iterable listHardwareProfiles();

   /**
    * Images are the available configured operating systems that someone can run
    * a node with. *
    * 
    * To implement this method, return the library native images available to
    * the user. These will be used to launch nodes as a part of the template.
    * 
    * @return a non-null iterable of available images.
    * @see ComputeService#listImages()
    */
   Iterable listImages();

   Iterable listLocations();

   N getNode(String id);

   //TODO consider making reboot/resume/suspend return the node they affected
   void destroyNode(String id);

   void rebootNode(String id);

   void resumeNode(String id);

   void suspendNode(String id);

   Iterable listNodes();

}