module Spree
  module Variants
    class OptionsPresenter
      WORDS_CONNECTOR = ', '.freeze

      attr_reader :variant

      delegate :option_values, to: :variant

      def initialize(variant)
        @variant = variant
      end

      def to_sentence
        options = option_values
        options = sort_options(options)
        options = present_options(options)

        join_options(options)
      end

      private

      def sort_options(options)
        options.sort_by { |o| o.option_type.position }
      end

      def present_options(options)
        options.map do |ov|
          method = "present_#{ov.option_type.name}_option"

          respond_to?(method, true) ? send(method, ov) : present_option(ov)
        end
      end

      def present_color_option(option)
        "#{option.option_type.presentation}: #{option.name}"
      end

      def present_option(option)
        "#{option.option_type.presentation}: #{option.presentation}"
      end

      def join_options(options)
        options.to_sentence(words_connector: WORDS_CONNECTOR, two_words_connector: WORDS_CONNECTOR)
      end
    end
  end
end