Ruby Blackjack

RubyBlackjack - Part 1.rb

# Initialize Variables
deck = []
suits = ["C", "H", "S", "D"]
card_nos = [2,3,4,5,6,7,8,9,10,"J","Q","K","A"]
user_hand = []
@@dealer_hand = []
user_hand_total = 0
valid_input = ['hit', 'stand', 'double', 'split']

# Create a Deck
card_nos.each do |x|
  
  suits.each_index do |y|
  z = x.to_s + suits[y]
  deck << z
  end
  
end

# Shuffle the Deck
deck.shuffle!

# Burn the first card, deal the user cards 2 and 4, the dealer 3 and 5
deck.delete_at(0)
user_hand << deck[0]
@@dealer_hand << deck[1]
user_hand << deck[2]
@@dealer_hand << deck[3]

# Calculate the users hand total
# This is overly complicated and clearly needs to be refactored but I don't know a better way to do it
if user_hand[0].chars.first == "J" || user_hand[0].chars.first == "Q" || user_hand[0].chars.first == "K" || user_hand[0] == "10C" || user_hand[0] == "10H" || user_hand[0] == "10S" || user_hand[0] == "10D" 
  a = 10
elsif user_hand[0].chars.first == "A"
  a = 11
  ace = 1
else
  a = user_hand[0].chars.first.to_i
end

if user_hand[1].chars.first == "J" || user_hand[1].chars.first == "Q" || user_hand[1].chars.first == "K" || user_hand[1] == "10C" || user_hand[1] == "10H" || user_hand[1] == "10S" || user_hand[1] == "10D" 
  b = 10
elsif user_hand[1].chars.first == "A"
  b = 11
  bace = 1
else
  b = user_hand[1].chars.first.to_i
end

user_hand_total = a + b

if ace && bace
  user_hand_total = 12
  user_hand_total_ace = 2
elsif ace
  user_hand_total_ace = ace + b
elsif bace
  user_hand_total_ace = a + bace
end

# Figure out the output
if user_hand_total == 21
  output = "BLACKJACK!!"
elsif user_hand[0].chars.first == "A" || user_hand[1].chars.first == "A"
  output = "Total: #{user_hand_total}/#{user_hand_total_ace}"
else
  output = "Total: #{user_hand_total}"
end

# Display the cards
puts "Dealer Shows : #{@@dealer_hand[1]}"
puts "Player Hand : #{user_hand[0]}, #{user_hand[1]} | #{output}"

# Prompt the user
print "Decision: "
user_response = gets.chomp.downcase.strip

until valid_input.include?(user_response) == true
      puts "Valid moves: hit, stand, double, split"
      print "Decision: "
      user_response = gets.chomp.downcase.strip
end

# Define the action method for decision
#
# I'm giving up here, because I don't have a good understanding of classes and methods yet.
#
def action(decision)
  if decision == 'stand'
    # Display dealer card
    puts "Dealer Turns over: #{@@dealer_hand[0]}"
    puts "Dealer Hand: #{@@dealer_hand[1]}, #{@@dealer_hand[0]}"
    # See who won
    # Display result
  end
end

# Act on the decision
action(user_response)