module Term
  module ANSIColor
    class Attribute
      class Color256
        Attribute.set :color0, 0, :html => '#000000'
        Attribute.set :color1, 1, :html => '#800000'
        Attribute.set :color2, 2, :html => '#808000'
        Attribute.set :color3, 3, :html => '#808000'
        Attribute.set :color4, 4, :html => '#000080'
        Attribute.set :color5, 5, :html => '#800080'
        Attribute.set :color6, 6, :html => '#008080'
        Attribute.set :color7, 7, :html => '#c0c0c0'

        Attribute.set :color8, 8, :html => '#808080'
        Attribute.set :color9, 9, :html => '#ff0000'
        Attribute.set :color10, 10, :html => '#00ff00'
        Attribute.set :color11, 11, :html => '#ffff00'
        Attribute.set :color12, 12, :html => '#0000ff'
        Attribute.set :color13, 13, :html => '#ff00ff'
        Attribute.set :color14, 14, :html => '#00ffff'
        Attribute.set :color15, 15, :html => '#ffffff'

        steps = [ 0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff ]

        for i in 16..231
          red, green, blue = (i - 16).to_s(6).rjust(3, '0').each_char.map { |c| steps[c.to_i] }
          Attribute.set "color#{i}", i, :red => red, :green => green, :blue => blue
        end

        grey = 8
        for i in 232..255
          Attribute.set "color#{i}", i, :red => grey, :green => grey, :blue => grey
          grey += 10
        end

        Attribute.set :on_color0, 0, :html => '#000000'
        Attribute.set :on_color1, 1, :html => '#800000'
        Attribute.set :on_color2, 2, :html => '#808000'
        Attribute.set :on_color3, 3, :html => '#808000'
        Attribute.set :on_color4, 4, :html => '#000080'
        Attribute.set :on_color5, 5, :html => '#800080'
        Attribute.set :on_color6, 6, :html => '#008080'
        Attribute.set :on_color7, 7, :html => '#c0c0c0'

        Attribute.set :on_color8, 8, :html => '#808080'
        Attribute.set :on_color9, 9, :html => '#ff0000'
        Attribute.set :on_color10, 10, :html => '#00ff00'
        Attribute.set :on_color11, 11, :html => '#ffff00'
        Attribute.set :on_color12, 12, :html => '#0000ff'
        Attribute.set :on_color13, 13, :html => '#ff00ff'
        Attribute.set :on_color14, 14, :html => '#00ffff'
        Attribute.set :on_color15, 15, :html => '#ffffff'

        steps = [ 0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff ]

        for i in 16..231
          red, green, blue = (i - 16).to_s(6).rjust(3, '0').each_char.map { |c| steps[c.to_i] }
          Attribute.set "on_color#{i}", i, :red => red, :green => green, :blue => blue
        end

        grey = 8
        for i in 232..255
          Attribute.set "on_color#{i}", i, :red => grey, :green => grey, :blue => grey
          grey += 10
        end
      end
    end
  end
end