class Card
  include Comparable
  attr_reader :rank, :suit, :icon

  RANKS       = %w(2 3 4 5 6 7 8 9 T J Q K A)
  SUITS       = %w(c s d h)
  ICONS       = { 'c' => '♣', 's' => '♠', 'd' => '♦', 'h' => '♥' }
  FACE_CARDS  = { 'T' => 10, 'J' => 11, 'Q' => 12, 'K' => 13, 'A' => 14 }

  def initialize(card)
    @rank, @suit = card.split(//)
    @icon        = ICONS[suit]
    validate(card)
  end

  def value
    rank[/\d/] ? rank.to_i : FACE_CARDS[rank]
  end

  def to_s
    "#{rank}#{icon}"
  end

  def <=>(other)
    value <=> other.value
  end

  private

  def validate(card)
    unless RANKS.include?(rank) && SUITS.include?(suit)
      fail ArgumentError
    end
  end
end