alakra/ndfd-weather-forecast-client

module NDFD
  class DWML
    class TimeLayout
      class << self
        def extract(elements)
          elements.map { |element| new(element) }
        end
      end

      attr_reader :element, :time_coordinate, :summarization, :layout_key, :valid_times

      def initialize(element)
        @element = element
        @valid_times = []

        extract_time_coordinate
        extract_summarization
        extract_layout_key
        extract_valid_times
      end

      protected

      def extract_time_coordinate
        @time_coordinate = element.attributes["time-coordinate"].text
      end

      def extract_summarization
        @summarization = element.attributes["summarization"].text
      end

      def extract_layout_key
        @layout_key = element.xpath("layout-key").first.text
      end

      def extract_valid_times
        start_times = element.xpath("start-valid-time")
        stop_times  = element.xpath("end-valid-time")

        start_times.each_with_index do |start_time, index|
          @valid_times << ValidTime.new(start_time.text, stop_times[index].try(:text))
        end
      end

      class ValidTime
        attr_reader :start, :stop

        def initialize(start, stop)
          @start = Time.zone.parse(start.to_s)
          @stop = Time.zone.parse(stop.to_s)
        end
      end
    end
  end
end