module Fog
  module Compute
    class AWS
      class Real

        require 'fog/aws/parsers/compute/associate_address'

        # Associate an elastic IP address with an instance
        #
        # ==== Parameters
        # * instance_id<~String> - Id of instance to associate address with (conditional) 
        # * public_ip<~String> - Public ip to assign to instance (conditional)
        # * network_interface_id<~String> - Id of a nic to associate address with (required in a vpc instance with more than one nic) (conditional)
        # * allocation_id<~String> - Allocation Id to associate address with (vpc only) (conditional)
        #
        # ==== Returns
        # * response<~Excon::Response>:
        #   * body<~Hash>:
        #     * 'requestId'<~String> - Id of request
        #     * 'return'<~Boolean> - success?
        #     * 'associationId'<~String> - association Id for eip to node (vpc only)
        #
        # {Amazon API Reference}[http://docs.amazonwebservices.com/AWSEC2/latest/APIReference/ApiReference-query-AssociateAddress.html]
        def associate_address(instance_id=nil, public_ip=nil, network_interface_id=nil, allocation_id=nil)
          # Cannot specify an allocation ip and a public IP at the same time.  If you have an allocation Id presumably you are in a VPC
          # so we will null out the public IP
          public_ip = allocation_id.nil? ? public_ip : nil
          request(
            'Action'             => 'AssociateAddress',
            'AllocationId'       => allocation_id,
            'InstanceId'         => instance_id,
            'NetworkInterfaceId' => network_interface_id,
            'PublicIp'           => public_ip,
            :idempotent          => true,
            :parser              => Fog::Parsers::Compute::AWS::AssociateAddress.new
          )
        end

      end

      class Mock

        def associate_address(instance_id=nil, public_ip=nil, network_interface_id=nil, allocation_id=nil)
          public_ip = allocation_id.nil? ? public_ip : nil
          response = Excon::Response.new
          response.status = 200
          instance = self.data[:instances][instance_id]
          address = public_ip.nil? ? nil : self.data[:addresses][public_ip]
          if ((instance && address) || (instance &&  !allocation_id.nil?) || (!allocation_id.nil? && !network_interface_id.nil?))
            if !allocation_id.nil?
              allocation_ip = describe_addresses( 'allocation-id'  => "#{allocation_id}").body['addressesSet'].first
              if !allocation_ip.nil?
                public_ip = allocation_ip['publicIp']
              end
            end
            if !address.nil?
              if current_instance = self.data[:instances][address['instanceId']]
                current_instance['ipAddress'] = current_instance['originalIpAddress']
              end
              address['instanceId'] = instance_id
            end
            # detach other address (if any)
            if self.data[:addresses][instance['ipAddress']]
              self.data[:addresses][instance['ipAddress']]['instanceId'] = nil
            end
            if !public_ip.nil?
              instance['ipAddress'] = public_ip
              instance['dnsName'] = Fog::AWS::Mock.dns_name_for(public_ip)
            end
            response.status = 200
            if !instance_id.nil? && !public_ip.nil?
              response.body = {
                'requestId' => Fog::AWS::Mock.request_id,
                'return'    => true
              }
            elsif !allocation_id.nil?
              response.body = {
                'requestId'     => Fog::AWS::Mock.request_id,
                'return'        => true,
                'associationId' => Fog::AWS::Mock.request_id
              }
            end
            response
          #elsif ! network_interface_id.nil? && allocation_id.nil?
          #  raise Fog::Compute::AWS::NotFound.new("You must specify an AllocationId when specifying a NetworkInterfaceID")
          #elsif instance.nil? && network_interface_id.nil?
          #  raise Fog::Compute::AWS::Error.new("You must specify either an InstanceId or a NetworkInterfaceID")
          #elsif !instance && !network_interface_id
          #  raise Fog::Compute::AWS::Error.new(" 2 You must specify either an InstanceId or a NetworkInterfaceID")
          elsif !instance
            raise Fog::Compute::AWS::NotFound.new("You must specify either an InstanceId or a NetworkInterfaceID")
          elsif !address
            raise Fog::Compute::AWS::Error.new("AuthFailure => The address '#{public_ip}' does not belong to you.")
          end
        end

      end
    end
  end
end