unless Fog.mocking?

  module Fog
    module AWS
      class EC2

        # Create an EBS volume
        #
        # ==== Parameters
        # * availability_zone<~String> - availability zone to create volume in
        # * size<~Integer> - Size in GiBs for volume.  Must be between 1 and 1024.
        # * snapshot_id<~String> - Optional, snapshot to create volume from
        #
        # ==== Returns
        # * response<~Excon::Response>:
        #   * body<~Hash>:
        #     * 'availabilityZone'<~String> - Availability zone for volume
        #     * 'createTime'<~Time> - Timestamp for creation
        #     * 'size'<~Integer> - Size in GiBs for volume
        #     * 'snapshotId'<~String> - Snapshot volume was created from, if any
        #     * 'status's<~String> - State of volume
        #     * 'volumeId'<~String> - Reference to volume
        def create_volume(availability_zone, size, snapshot_id = nil)
          request({
            'Action' => 'CreateVolume',
            'AvailabilityZone' => availability_zone,
            'Size' => size,
            'SnapshotId' => snapshot_id
          }, Fog::Parsers::AWS::EC2::CreateVolume.new)
        end

      end
    end
  end

else

  module Fog
    module AWS
      class EC2

        def create_volume(availability_zone, size, snapshot_id = nil)
          response = Excon::Response.new
          if availability_zone && size
            response.status = 200
            volume_id = Fog::AWS::Mock.volume_id
            data = {
              'availabilityZone'  => availability_zone,
              'attachmentSet'     => [],
              'createTime'        => Time.now,
              'size'              => size,
              'snapshotId'        => snapshot_id || '',
              'status'            => 'creating',
              'volumeId'          => volume_id
            }
            Fog::AWS::EC2.data[:volumes][volume_id] = data
            response.body = {
              'requestId' => Fog::AWS::Mock.request_id
            }.merge!(data.reject {|key,value| !['availabilityZone','createTime','size','snapshotId','status','volumeId'].include?(key) })
          else
            response.status = 400
            response.body = {
              'Code' => 'MissingParameter'
            }
            unless availability_zone
              response.body['Message'] = 'The request must contain the parameter availability_zone'
            else
              response.body['Message'] = 'The request must contain the parameter size'
            end
          end
          response
        end

      end
    end
  end

end