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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.aws.ec2.domain;

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

import java.util.Date;

/**
 * 
 * @see 
 * @author Adrian Cole
 */
public class Attachment implements Comparable {
   public static enum Status {
      ATTACHING, ATTACHED, DETACHING, DETACHED, BUSY, UNRECOGNIZED;
      public String value() {
         return name().toLowerCase();
      }

      @Override
      public String toString() {
         return value();
      }

      public static Status fromValue(String status) {
         try {
            return valueOf(checkNotNull(status, "status").toUpperCase());
         } catch (IllegalArgumentException e) {
            return UNRECOGNIZED;
         }
      }
   }

   private final String region;
   private final String volumeId;
   private final String instanceId;
   private final String device;
   private final Status status;
   private final Date attachTime;

   public Attachment(String region, String volumeId, String instanceId, String device, Status status, Date attachTime) {
      this.region = checkNotNull(region, "region");
      this.volumeId = volumeId;
      this.instanceId = instanceId;
      this.device = device;
      this.status = status;
      this.attachTime = attachTime;
   }

   /**
    * Snapshots are tied to Regions and can only be used for volumes within the same Region.
    * 
    */
   public String getRegion() {
      return region;
   }

   /**
    * The ID of the volume.
    */
   public String getVolumeId() {
      return volumeId;
   }

   /**
    * The ID of the instance.
    */
   public String getId() {
      return instanceId;
   }

   /**
    * The device as it is exposed to the instance.
    */
   public String getDevice() {
      return device;
   }

   /**
    * Volume state.
    */
   public Status getStatus() {
      return status;
   }

   /**
    * Time stamp when the attachment initiated.
    */
   public Date getAttachTime() {
      return attachTime;
   }

   @Override
   public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result + ((attachTime == null) ? 0 : attachTime.hashCode());
      result = prime * result + ((device == null) ? 0 : device.hashCode());
      result = prime * result + ((instanceId == null) ? 0 : instanceId.hashCode());
      result = prime * result + ((region == null) ? 0 : region.hashCode());
      result = prime * result + ((status == null) ? 0 : status.hashCode());
      result = prime * result + ((volumeId == null) ? 0 : volumeId.hashCode());
      return result;
   }

   @Override
   public boolean equals(Object obj) {
      if (this == obj)
         return true;
      if (obj == null)
         return false;
      if (getClass() != obj.getClass())
         return false;
      Attachment other = (Attachment) obj;
      if (attachTime == null) {
         if (other.attachTime != null)
            return false;
      } else if (!attachTime.equals(other.attachTime))
         return false;
      if (device == null) {
         if (other.device != null)
            return false;
      } else if (!device.equals(other.device))
         return false;
      if (instanceId == null) {
         if (other.instanceId != null)
            return false;
      } else if (!instanceId.equals(other.instanceId))
         return false;
      if (region == null) {
         if (other.region != null)
            return false;
      } else if (!region.equals(other.region))
         return false;
      if (status == null) {
         if (other.status != null)
            return false;
      } else if (!status.equals(other.status))
         return false;
      if (volumeId == null) {
         if (other.volumeId != null)
            return false;
      } else if (!volumeId.equals(other.volumeId))
         return false;
      return true;
   }

   @Override
   public String toString() {
      return "Attachment [region=" + region + ", volumeId=" + volumeId + ", instanceId=" + instanceId + ", device="
               + device + ", attachTime=" + attachTime + ", status=" + status + "]";
   }

   @Override
   public int compareTo(Attachment o) {
      return attachTime.compareTo(o.attachTime);
   }

}