module Garb
  class ReportParameter

    attr_reader :elements

    def initialize(name)
      @name = name
      @elements = []
    end

    def name
      @name.to_s
    end

    def <<(element)
      (@elements += [element].flatten).compact!
      self
    end

    def to_params
      value = self.elements.map { |param| Garb.to_google_analytics(param) }.join(',')
      value.empty? ? {} : {self.name => value}
    end
  end
end