module Fog
  module Compute
    class Ecloud
      module Shared
        def validate_internet_service_monitor(monitor)
          #FIXME: Refactor this type of function into something generic
          unless ['Disabled','HTTP','ECV'].include?(monitor[:type])
            raise ArgumentError.new("Supported monitor types are: ECV & HTTP")
          end

          required_opts = case monitor[:type]
                          when "Disabled"
                            [:type, :is_enabled]
                          else
                            [:type, :url_send_string, :http_headers, :receive_string, :is_enabled]
                          end

          unless required_opts.all? { |opt| monitor.has_key?(opt) && monitor[opt] }
            raise ArgumentError.new("Required Monitor data missing: #{(required_opts - monitor.keys).map(&:inspect).join(", ")}")
          end

          case monitor[:type]
            when "HTTP", "ECV"
              unless monitor[:http_headers].is_a?(Array) || monitor[:http_headers].is_a?(String)
                raise ArgumentError.new("Monitor :http_headers must be a String or Array")
              end
          end

          unless [true, false, "true", "false"].include?(monitor[:is_enabled])
            raise ArgumentError.new("Monitor :is_enabled must be true or false")
          end
        end

        def validate_internet_service_data(service_data, configure=false)
          required_opts = [:name, :protocol, :port, :description, :enabled]
          if configure
            required_opts + [ :id, :href, :timeout ]
          end
          unless required_opts.all? { |opt| service_data.has_key?(opt) }
            raise ArgumentError.new("Required Internet Service data missing: #{(required_opts - service_data.keys).map(&:inspect).join(", ")}")
          end
        end

        def ensure_monitor_defaults!(monitor)
          if monitor[:http_headers].is_a?(String)
            monitor[:http_headers] = [ monitor[:http_headers] ]
          end

          unless monitor[:retries]
            monitor[:retries] = 3
          end

          unless monitor[:response_timeout]
            monitor[:response_timeout] = 2
          end

          unless monitor[:down_time]
            monitor[:down_time] = 30
          end

          unless monitor[:interval]
            monitor[:interval] = 5
          end
        end
      end

      class Real
        include Shared

        def add_internet_service(internet_services_uri, service_data)
          validate_internet_service_data(service_data)
          if monitor = service_data[:monitor]
            validate_internet_service_monitor(monitor)
            ensure_monitor_defaults!(monitor)
          end

          request(
            :body     => generate_internet_service_request(service_data),
            :expects  => 200,
            :headers  => {'Content-Type' => 'application/vnd.tmrk.ecloud.internetService+xml'},
            :method   => 'POST',
            :uri      => internet_services_uri,
            :parse    => true
          )
        end

        private

        def generate_internet_service_request(service_data)
          builder = Builder::XmlMarkup.new
          builder.CreateInternetServiceRequest(ecloud_xmlns) {
            builder.Name(service_data[:name])
            builder.Protocol(service_data[:protocol])
            builder.Port(service_data[:port])
            builder.Enabled(service_data[:enabled])
            builder.Description(service_data[:description])
            builder.RedirectURL(service_data[:redirect_url])
            if monitor = service_data[:monitor]
              generate_monitor_section(builder,monitor)
            end
          }
        end

        def generate_monitor_section(builder, monitor)
          builder.Monitor {
            builder.MonitorType(monitor[:type])
            case monitor[:type]
            when "ECV","HTTP"
              builder.UrlSendString(monitor[:url_send_string])
              builder.HttpHeader(monitor[:http_headers].join("\n"))
              builder.ReceiveString(monitor[:receive_string])
              builder.Interval(monitor[:interval])
              builder.ResponseTimeOut(monitor[:response_timeout])
              builder.DownTime(monitor[:downtime])
              builder.Retries(monitor[:retries])
            end
            builder.IsEnabled(monitor[:is_enabled])
          }
        end

      end

      class Mock
        include Shared

        #
        # Based on
        # http://support.theenterprisecloud.com/kb/default.asp?id=561&Lang=1&SID=
        #

        def add_internet_service(internet_services_uri, service_data)
          validate_internet_service_data(service_data)

          internet_services_uri = ensure_unparsed(internet_services_uri)

          if public_ip_internet_service_collection = mock_data.public_ip_internet_service_collection_from_href(internet_services_uri)
            new_public_ip_internet_service = MockPublicIpInternetService.new(service_data, public_ip_internet_service_collection)
            public_ip_internet_service_collection.items << new_public_ip_internet_service
            xml = generate_internet_service(Builder::XmlMarkup.new, new_public_ip_internet_service, true)

            mock_it 200, xml, {'Content-Type' => 'application/vnd.tmrk.ecloud.internetService+xml'}
          else
            mock_error 200, "401 Unauthorized"
          end
        end
      end
    end
  end
end