#!/usr/bin/env ruby

class Card
  attr_reader :value, :suit

  def initialize(value, suit)
    @value = value
    @suit = suit
  end
end

def has_suit?(hand, suit)
  hand.any? { |card| card.suit == suit }
end

def valid_follow_card?(hand, lead_card, follow_card)
  if follow_card.suit == lead_card.suit
    true
  elsif has_suit?(hand, lead_card.suit)
    false
  else
    true
  end
end

hand = [
  Card.new("9", "hearts"),
  Card.new("jack", "clubs"),
  Card.new("7", "spades")
]

lead_card = Card.new("king", "hearts")

puts valid_follow_card?(hand, lead_card, hand[0]) # true
puts valid_follow_card?(hand, lead_card, hand[1]) # false