require 'ttfunk/table'

module TTFunk  
  class Table
    class Hhea < Table
      attr_reader :version
      attr_reader :ascent
      attr_reader :descent
      attr_reader :line_gap
      attr_reader :advance_width_max
      attr_reader :min_left_side_bearing
      attr_reader :min_right_side_bearing
      attr_reader :x_max_extent
      attr_reader :carot_slope_rise
      attr_reader :carot_slope_run
      attr_reader :metric_data_format
      attr_reader :number_of_metrics

      def self.encode(hhea, hmtx)
        raw = hhea.raw
        raw[-2,2] = [hmtx[:number_of_metrics]].pack("n")
        return raw
      end

      private

        def parse!
          @version = read(4, "N").first
          @ascent, @descent, @line_gap = read_signed(3)
          @advance_width_max = read(2, "n").first

          @min_left_side_bearing, @min_right_side_bearing, @x_max_extent,
            @carot_slope_rise, @carot_slope_run, @caret_offset,
            reserved, reserved, reserved, reserved,
            @metric_data_format = read_signed(11)

          @number_of_metrics = read(2, "n").first
        end
    end
  end
end