blackjack.rb

def calculate_total(cards)
  array = cards.map {|e| e[1]}

  total = 0
  array.each do |value|
    if value == "Ace"
      total += 11
    elsif value == "Jack" || value == "Queen" || value == "King"
      total += 10
    else
      total += value.to_i
    end
  end

  array.select {|e| e == "Ace"}.count.times do # Multiple Aces
    total -= 10 if total > 21
  end

  total
end

puts "Welcome to Blackjack!"
puts "Please enter your name"
name = gets.chomp.capitalize
puts "Good luck #{name}!"
puts

loop do

  # Deck
  suits = %w(Hearts Diamonds Clubs Spades)
  cards = %w(2 3 4 5 6 7 8 9 10 Jack Queen King Ace)

  deck = suits.product(cards)
  deck.shuffle!

  # Deal Cards
  dealer_cards = []
  player_cards = []

  2.times do
    player_cards << deck.pop
    dealer_cards << deck.pop
  end

  dealer_total = calculate_total(dealer_cards)
  player_total = calculate_total(player_cards)

  # Show Cards
  puts "Dealer has: #{dealer_cards[0].reverse.join(' of ')} and #{dealer_cards[1].reverse.join(' of ')} for a total of #{dealer_total}."
  puts "#{name} you have: #{player_cards[0].reverse.join(' of ')} and #{player_cards[1].reverse.join(' of ')} for a total of #{player_total}."
  puts

  # Player turn
  if player_total == 21 && dealer_total == 21
    puts "#{name.upcase}, you and the Dealer both hit Blackjack... It's a push."
  elsif player_total == 21
    puts "BLACKJACK... YOU WON #{name.upcase}!"
  else
    while player_total < 21
      puts "Do you want to Hit or Stay? (h/s)"
      hit_or_stay = gets.chomp.downcase
      puts

      if hit_or_stay == "s"
        puts "#{name} you decided to stay."
        puts
        break
      elsif hit_or_stay == "h" 
        new_card = deck.pop
        puts "Dealing new card to #{name}: #{new_card.reverse.join(' of ')}"
        player_cards << new_card
        player_total = calculate_total(player_cards)
        puts "#{name} your total is now #{player_total}."
        puts

        if player_total == 21
          puts "BLACKJACK... YOU WON #{name.upcase}!"
        elsif player_total > 21
          puts "Sorry, #{name}, you busted and lost. :-("
        end
      else
        puts "Please pick 'h' to hit or 's' to stay."
      end
    end
  end

  # Dealer turn
  if dealer_total == 21
    puts "Sorry #{name}, you lost... Dealer hit Blackjack. :-("
  elsif player_total < 21
    while dealer_total < 17
      new_card = deck.pop
      puts "Dealing new card to Dealer: #{new_card.reverse.join(' of ')}"
      dealer_cards << new_card
      dealer_total = calculate_total(dealer_cards)
      puts "Dealer total is now #{dealer_total}."
      puts

      if dealer_total == 21
        puts "Sorry #{name}, you lost... Dealer hit Blackjack. :-("
      elsif dealer_total > 21
        puts "Dealer busted... YOU WON #{name.upcase}!"
      end
    end
  end

  # Compare hands
  if player_total < 21 && dealer_total < 21
    puts "Dealer's cards: "
    dealer_cards.each do |card|
      puts "#{card.reverse.join(' of ')}"
    end

    puts
    puts "#{name}'s cards: "
    player_cards.each do |card|
      puts "#{card.reverse.join(' of ')}"
    end

    puts
    if dealer_total > player_total
      puts "Sorry, #{name}, you lost. :-("
    elsif
      player_total > dealer_total
      puts "YOU WON #{name.upcase}!"
    else
      puts "It's a push."
    end
  end

  puts
  puts "Do you want to play again? (y/n)"
  break if gets.chomp.downcase != 'y'
  puts
end

puts "Thnaks for playing #{name}."