module Fog
  module Compute
    class AWS
      class Real
        require 'fog/aws/parsers/compute/spot_instance_requests'

        # Launch specified instances
        #
        # ==== Parameters
        # * 'image_id'<~String> - Id of machine image to load on instances
        # * 'instance_type'<~String> - Type of instance
        # * 'spot_price'<~Float> - maximum hourly price for instances launched
        # * options<~Hash>:
        #   * 'AvailabilityZoneGroup'<~String> - specify whether or not to launch all instances in the same availability group
        #   * 'InstanceCount'<~Integer> - maximum number of instances to launch
        #   * 'LaunchGroup'<~String> - whether or not to launch/shutdown instances as a group
        #   * 'LaunchSpecification.BlockDeviceMapping'<~Array>: array of hashes
        #     * 'DeviceName'<~String> - where the volume will be exposed to instance
        #     * 'VirtualName'<~String> - volume virtual device name
        #     * 'Ebs.SnapshotId'<~String> - id of snapshot to boot volume from
        #     * 'Ebs.NoDevice'<~String> - specifies that no device should be mapped
        #     * 'Ebs.VolumeSize'<~String> - size of volume in GiBs required unless snapshot is specified
        #     * 'Ebs.DeleteOnTermination'<~String> - specifies whether or not to delete the volume on instance termination
        #   * 'LaunchSpecification.KeyName'<~String> - Name of a keypair to add to booting instances
        #   * 'LaunchSpecification.Monitoring.Enabled'<~Boolean> - Enables monitoring, defaults to disabled
        #   * 'LaunchSpecification.SubnetId'<~String> - VPC subnet ID in which to launch the instance
        #   * 'LaunchSpecification.Placement.AvailabilityZone'<~String> - Placement constraint for instances
        #   * 'LaunchSpecification.SecurityGroup'<~Array> or <~String> - Name of security group(s) for instances, not supported in VPC
        #   * 'LaunchSpecification.SecurityGroupId'<~Array> or <~String> - Id of security group(s) for instances, use this or LaunchSpecification.SecurityGroup
        #   * 'LaunchSpecification.UserData'<~String> -  Additional data to provide to booting instances
        #   * 'LaunchSpecification.EbsOptimized'<~Boolean> - Whether the instance is optimized for EBS I/O
        #   * 'Type'<~String> - spot instance request type in ['one-time', 'persistent']
        #   * 'ValidFrom'<~Time> - start date for request
        #   * 'ValidUntil'<~Time> - end date for request
        #
        # ==== Returns
        # * response<~Excon::Response>:
        #   * body<~Hash>:
        #     * 'requestId'<~String> - Id of request
        #     * 'spotInstanceRequestSet'<~Array>:
        #       * 'createTime'<~Time> - time of instance request creation
        #       * 'instanceId'<~String> - instance id if one has been launched to fulfill request
        #       * 'launchedAvailabilityZone'<~String> - availability zone of instance if one has been launched to fulfill request
        #       * 'launchSpecification'<~Hash>:
        #         * 'blockDeviceMapping'<~Hash> - list of block device mappings for instance
        #         * 'groupSet'<~String> - security group(s) for instance
        #         * 'keyName'<~String> - keypair name for instance
        #         * 'imageId'<~String> - AMI for instance
        #         * 'instanceType'<~String> - type for instance
        #         * 'monitoring'<~Boolean> - monitoring status for instance
        #         * 'subnetId'<~String> - VPC subnet ID for instance
        #       * 'productDescription'<~String> - general description of AMI
        #       * 'spotInstanceRequestId'<~String> - id of spot instance request
        #       * 'spotPrice'<~Float> - maximum price for instances to be launched
        #       * 'state'<~String> - spot instance request state
        #       * 'type'<~String> - spot instance request type
        #
        # {Amazon API Reference}[http://docs.amazonwebservices.com/AWSEC2/latest/APIReference/ApiReference-query-RequestSpotInstances.html]
        def request_spot_instances(image_id, instance_type, spot_price, options = {})
          if block_device_mapping = options.delete('LaunchSpecification.BlockDeviceMapping')
            block_device_mapping.each_with_index do |mapping, index|
              for key, value in mapping
                options.merge!({ format("LaunchSpecification.BlockDeviceMapping.%d.#{key}", index) => value })
              end
            end
          end
          if security_groups = options.delete('LaunchSpecification.SecurityGroup')
            options.merge!(Fog::AWS.indexed_param('LaunchSpecification.SecurityGroup', [*security_groups]))
          end
          if security_group_ids = options.delete('LaunchSpecification.SecurityGroupId')
            options.merge!(Fog::AWS.indexed_param('LaunchSpecification.SecurityGroupId', [*security_group_ids]))
          end
          if options['LaunchSpecification.UserData']
            options['LaunchSpecification.UserData'] = Base64.encode64(options['LaunchSpecification.UserData'])
          end

          if options['ValidFrom'] && options['ValidFrom'].is_a?(Time)
            options['ValidFrom'] =  options['ValidFrom'].iso8601
          end

          if options['ValidUntil'] && options['ValidUntil'].is_a?(Time)
            options['ValidUntil'] =  options['ValidUntil'].iso8601
          end

          request({
            'Action'                            => 'RequestSpotInstances',
            'LaunchSpecification.ImageId'       => image_id,
            'LaunchSpecification.InstanceType'  => instance_type,
            'SpotPrice'                         => spot_price,
            :parser                             => Fog::Parsers::Compute::AWS::SpotInstanceRequests.new
          }.merge!(options))
        end
      end

      class Mock
        def request_spot_instances(image_id, instance_type, spot_price, options = {})
          response = Excon::Response.new

          if (image_id && instance_type && spot_price)
            response.status = 200

            all_instance_types = flavors.map { |f| f.id }
            if !all_instance_types.include?(instance_type)
              message = "InvalidParameterValue => Invalid value '#{instance_type}' for InstanceType."
              raise Fog::Compute::AWS::Error.new(message)
            end

            spot_price = spot_price.to_f
            if !(spot_price > 0)
              message = "InvalidParameterValue => Value (#{spot_price}) for parameter price is invalid."
              message << " \"#{spot_price}\" is an invalid spot instance price"
              raise Fog::Compute::AWS::Error.new(message)
            end

            if !image_id.match(/^ami-[a-f0-9]{8}$/)
              message = "The image id '[#{image_id}]' does not exist"
              raise Fog::Compute::AWS::NotFound.new(message)
            end

          else
            message = 'MissingParameter => '
            message << 'The request must contain the parameter '
            if !image_id
              message << 'image_id'
            elsif !instance_type
              message << 'instance_type'
            else
              message << 'spot_price'
            end
            raise Fog::Compute::AWS::Error.new(message)
          end

          for key in %w(AvailabilityZoneGroup LaunchGroup)
            if options.is_a?(Hash) && options.key?(key)
              Fog::Logger.warning("#{key} filters are not yet mocked [light_black](#{caller.first})[/]")
              Fog::Mock.not_implemented
            end
          end

          launch_spec = {
            'iamInstanceProfile' => {},
            'blockDeviceMapping' => [],
            'groupSet'           => [Fog::AWS::Mock.security_group_id],
            'imageId'            => image_id,
            'instanceType'       => instance_type,
            'monitoring'         => options['MonitoringEnabled'] || false,
            'subnetId'           => nil,
            'ebsOptimized'       => false,
            'keyName'            => options['KeyName'] || nil
          }

          response.body = {
            'spotInstanceRequestSet' => [
              {
                'launchSpecification'   => launch_spec,
                'spotInstanceRequestId' => Fog::AWS::Mock.spot_instance_request_id,
                'spotPrice'             => spot_price,
                'type'                  => options['Type'] || 'one-time',
                'state'                 => 'open',
                'fault'                 => {
                  'code'    => 'pending-evaluation',
                  'message' => 'Your Spot request has been submitted for review, and is pending evaluation.'
                },
                'createTime'         => Time.now,
                'productDescription' => 'Linux/UNIX'
              }
            ],
            'requestId' => Fog::AWS::Mock.request_id
          }

          response
        end
      end
    end
  end
end