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require_relative '../pb/grpc/testing/metrics_pb.rb'
require_relative '../pb/grpc/testing/metrics_services_pb.rb'

class Gauge
  def get_name
    raise NoMethodError.new
  end

  def get_type
    raise NoMethodError.new
  end

  def get_value
    raise NoMethodError.new
  end
end

class MetricsServiceImpl < Grpc::Testing::MetricsService::Service
  include Grpc::Testing
  @gauges

  def initialize
    @gauges = {}
  end

  def register_gauge(gauge)
    @gauges[gauge.get_name] = gauge
  end

  def make_gauge_response(gauge)
    response = GaugeResponse.new(:name => gauge.get_name)
    value = gauge.get_value
    case gauge.get_type
    when 'long'
      response.long_value = value
    when 'double'
      response.double_value = value
    when 'string'
      response.string_value = value
    end
    response
  end

  def get_all_gauges(_empty, _call)
    @gauges.values.map do |gauge|
      make_gauge_response gauge
    end
  end

  def get_gauge(gauge_req, _call)
    gauge = @gauges[gauge_req.name]
    make_gauge_response gauge
  end
end