Created very basic blackjack web app

Gemfile

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+source 'https://rubygems.org'
+gem 'sinatra'
+gem 'sinatra-contrib'
+
+group :development do
+  gem 'pry-byebug'
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    backports (3.6.8)
+    byebug (9.0.6)
+    coderay (1.1.1)
+    method_source (0.8.2)
+    multi_json (1.12.1)
+    pry (0.10.4)
+      coderay (~> 1.1.0)
+      method_source (~> 0.8.1)
+      slop (~> 3.4)
+    pry-byebug (3.4.2)
+      byebug (~> 9.0)
+      pry (~> 0.10)
+    rack (1.6.5)
+    rack-protection (1.5.3)
+      rack
+    rack-test (0.6.3)
+      rack (>= 1.0)
+    sinatra (1.4.8)
+      rack (~> 1.5)
+      rack-protection (~> 1.4)
+      tilt (>= 1.3, < 3)
+    sinatra-contrib (1.4.7)
+      backports (>= 2.0)
+      multi_json
+      rack-protection
+      rack-test
+      sinatra (~> 1.4.0)
+      tilt (>= 1.3, < 3)
+    slop (3.6.0)
+    tilt (2.0.6)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  pry-byebug
+  sinatra
+  sinatra-contrib
+
+BUNDLED WITH
+   1.13.7

README.md

@@ -1,4 +1,24 @@
-# assignment_blackjack
-Hit me baby one more time?
+#  Simple Black Jack Game in Sinatra
 
-[A Blackjack game using the Ruby Sinatra web application framework which uses object oriented programming, cookies, sessions, and JSON from the Viking Code School](http://www.vikingcodeschool.com)
+ The goal of this simple Blackjack game is to focus on the function of the application rather than styling. The game is limited ot it's simplest logic - hitting, staying, making bets. (no split, double betting etc.)
+
+<img src="black_jack.png" width="200" height="300" />
+
+
+## Getting Started
+
+If you want to quick run some the examples to see the code in action, and you have installed Ruby and Rails, run
+```
+$ ruby app_bj_2.rb
+```
+
+Open browser on http://localhost:4567/
+
+## Authors
+
+* **Dariusz Biskupski** - *Initial work* - https://dariuszbiskupski.com
+
+
+## Acknowledgments
+
+The assignment is created for [Viking Code School](https://www.vikingcodeschool.com/)

app_bj_2.rb

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+
+require 'erb'
+require 'pry-byebug'
+require "bundler/setup"
+require 'sinatra'
+require 'sinatra/reloader' if development?
+require './helpers/bj_helper_2.rb'
+require 'json'
+
+helpers BJHelper
+
+enable :sessions
+set :session_secret, '*&(^B234'
+
+get "/" do
+  erb :home
+end
+
+get '/blackjack/bet' do
+  dealer_hand = BJHelper::Dealer.new(session[:dealer_hand]).load_dealer_hand
+  player = BJHelper::Player.new(session[:player_hand], session[:player_bankroll])
+  player_bankroll = player.bankroll
+  player_hand = player.load_player_hand
+  session[:player_bankroll] = player_bankroll.to_json
+  session[:dealer_hand] = dealer_hand.to_json
+  session[:player_hand] = player_hand.to_json
+  erb :"blackjack/bet", locals: { player_bankroll: player_bankroll }
+end
+
+post '/bet' do
+  dealer_hand = BJHelper::Dealer.new(session[:dealer_hand]).load_dealer_hand
+  player = BJHelper::Player.new(session[:player_hand], session[:player_bankroll])
+  player_bankroll = player.bankroll
+  player_hand = player.load_player_hand
+  player_bet = params[:amount].to_i
+  if player_bet < player_bankroll
+    session[:dealer_hand] = dealer_hand.to_json
+    session[:player_hand] = player_hand.to_json
+    player_bankroll = (player_bankroll - player_bet)
+    session[:player_bankroll] = player_bankroll.to_json
+    session[:player_bet] = player_bet.to_json
+    erb :"blackjack/hit", locals: { player_bet: player_bet, player_bankroll: player_bankroll, dealer_hand: dealer_hand, player_hand: player_hand }
+  else
+    player_bet = 0
+    session[:player_bet] = player_bet.to_json
+    erb :"blackjack/bet", locals: { player_bet: player_bet, player_bankroll: player_bankroll, dealer_hand: dealer_hand, player_hand: player_hand }
+  end
+end
+
+get '/blackjack/hit' do
+  dealer_hand = BJHelper::Dealer.new(session[:dealer_hand]).load_dealer_hand
+  player = BJHelper::Player.new(session[:player_hand], session[:player_bankroll])
+  player_bankroll = player.bankroll
+  player_hand = player.load_player_hand
+  player_bet = session[:player_bet]
+  session[:dealer_hand] = dealer_hand.to_json
+  session[:player_hand] = player_hand.to_json
+  session[:player_bankroll] = player_bankroll.to_json
+  erb :"blackjack/hit", locals: { player_bet: player_bet, player_bankroll: player_bankroll, dealer_hand: dealer_hand, player_hand: player_hand }
+end
+
+post '/hit' do
+  dealer_hand = BJHelper::Dealer.new(session[:dealer_hand]).load_dealer_hand
+  player = BJHelper::Player.new(session[:player_hand], session[:player_bankroll])
+  player_bankroll = player.bankroll
+  player_hand = player.load_player_hand
+  player_bet = session[:player_bet]
+  deck = BJHelper::Deck.new
+  if deck.checking_points(player_hand) >= 21
+    dealer_hand << deck.deal_hand
+    session[:dealer_hand] = dealer_hand.to_json
+    session[:player_hand] = player_hand.to_json
+    session[:player_bankroll] = player_bankroll.to_json
+    erb :"blackjack/stay", locals: { player_bet: player_bet, player_bankroll: player_bankroll,dealer_hand: dealer_hand, player_hand: player_hand }
+    redirect to("/blackjack/stay")
+  else
+    player_hand << deck.deal_hand
+    session[:dealer_hand] = dealer_hand.to_json
+    session[:player_hand] = player_hand.to_json
+    session[:player_bankroll] = player_bankroll.to_json
+    if deck.checking_points(player_hand) >= 21
+      erb :"blackjack/stay", locals: { player_bet: player_bet, player_bankroll: player_bankroll,dealer_hand: dealer_hand, player_hand: player_hand }
+      redirect to("/blackjack/stay")
+    else
+      erb :"blackjack/hit", locals: { player_bet: player_bet, player_bankroll: player_bankroll,dealer_hand: dealer_hand, player_hand: player_hand }
+    end
+  end
+end
+
+get '/blackjack/stay' do
+  dealer_hand = BJHelper::Dealer.new(session[:dealer_hand]).load_dealer_hand
+  player = BJHelper::Player.new(session[:player_hand], session[:player_bankroll])
+  player_bankroll = player.bankroll
+  player_hand = player.load_player_hand
+  player_bet = session[:player_bet]
+  session[:dealer_hand] = dealer_hand.to_json
+  session[:player_hand] = player_hand.to_json
+  session[:player_bankroll] = player_bankroll.to_json
+  erb :"blackjack/stay", locals: { player_bet: player_bet, player_bankroll: player_bankroll, dealer_hand: dealer_hand, player_hand: player_hand }
+end
+
+post '/stay' do
+  dealer_hand = BJHelper::Dealer.new(session[:dealer_hand]).load_dealer_hand
+  player = BJHelper::Player.new(session[:player_hand], session[:player_bankroll])
+  player_bankroll = player.bankroll
+  player_hand = player.load_player_hand
+  player_bet = JSON.parse(session[:player_bet],:quirks_mode => true)
+  deck = BJHelper::Deck.new
+  while deck.checking_points(dealer_hand) < 17
+    dealer_hand << deck.deal_hand
+  end
+  who_won = deck.check_who_won(player_hand, dealer_hand)
+  if who_won == -1
+    player_bet = 0
+    player_bankroll = player_bankroll - player_bet
+    session[:player_bankroll] = player_bankroll.to_json
+    session[:player_bet] = player_bet.to_json
+  elsif  who_won == 0
+    player_bankroll = player_bankroll + player_bet
+    session[:player_bankroll] = player_bankroll.to_json
+    player_bet = 0
+    session[:player_bet] = player_bet.to_json
+  else
+    player_bankroll = player_bankroll + player_bet*2
+    session[:player_bankroll] = player_bankroll.to_json
+    player_bet = 0
+    session[:player_bet] = player_bet.to_json
+  end
+  session[:who_won] = who_won.to_json
+  session[:dealer_hand] = dealer_hand.to_json
+  session[:player_hand] = player_hand.to_json
+  erb :"blackjack/results", locals: { player_bet: player_bet, player_bankroll: player_bankroll, who_won: who_won, dealer_hand: dealer_hand, player_hand: player_hand }
+  redirect to("/blackjack/results")
+end
+
+get '/blackjack/results' do
+  dealer_hand = BJHelper::Dealer.new(session[:dealer_hand]).load_dealer_hand
+  player = BJHelper::Player.new(session[:player_hand], session[:player_bankroll])
+  player_bankroll = player.bankroll
+  player_hand = player.load_player_hand
+  player_bet = JSON.parse(session[:player_bet],:quirks_mode => true)
+  who_won = JSON.parse(session[:who_won],:quirks_mode => true)
+  erb :"blackjack/results", locals: { player_bet: player_bet, player_bankroll: player_bankroll,who_won: who_won, dealer_hand: dealer_hand, player_hand: player_hand }
+end
+
+post '/new_game' do
+  session.delete(:dealer_hand)
+  session.delete(:player_hand)
+  session.delete(:player_bankroll)
+  session.delete(:who_won)
+  session[:player_bet] = 0
+  redirect to("/blackjack/bet")
+end
+
+post '/continue_game' do
+  session.delete(:dealer_hand)
+  session.delete(:player_hand)
+  session.delete(:who_won)
+  session[:player_bet] = 0
+  redirect to("/blackjack/bet")
+end
+

helpers/bj_helper_2.rb

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+
+module BJHelper
+
+  class Player
+
+    attr_accessor :bankroll
+
+    def initialize(session_hand, bankroll) #make it to_json in app
+      session_hand == nil ? @session_hand = nil : @session_hand = JSON.parse(session_hand,:quirks_mode => true)
+      bankroll.nil? ? @bankroll = 1000 : @bankroll = JSON.parse(bankroll,:quirks_mode => true)
+      @decks = Deck.new
+    end
+
+    def load_player_hand
+      @session_hand ? @session_hand : [@decks.deal_hand, @decks.deal_hand]
+    end
+
+  end
+
+  class Dealer
+
+    def initialize(session_hand) #make it to_json in app
+      session_hand == nil ? @session_hand = nil : @session_hand = JSON.parse(session_hand,:quirks_mode => true)
+      @decks = Deck.new
+    end
+
+    def load_dealer_hand
+      @session_hand ? @session_hand : [@decks.deal_hand, @decks.deal_hand]
+    end
+
+  end
+
+  class Deck
+
+    def initialize #make it to_json in app
+      @five_decks = create_decks # if @session_hash.decks == nil || @session_hash.decks  == []
+    end
+
+    def decks_builder
+      [2,3,4,5,6,7,8,9,10, "J", "Q", "K", "A"].product(["Diamonds", "Hearts", "Clubs", "Spades"])
+    end
+
+    def create_decks
+      the_deck = []
+      4.times { |i| the_deck += decks_builder }
+      the_deck.shuffle
+    end
+
+    def deal_hand
+      @five_decks.pop
+    end
+
+    def checking_points(current_hand)
+      total = 0
+      as_value = 0
+      current_hand.each do |arr|
+        if %w{J K Q}.include? arr[0]
+          total += 10
+        elsif "A" == arr[0]
+          total += 1
+          as_value += 10
+        else
+          total += arr[0]
+        end
+      end
+      puts "DBG: total = #{total.inspect}"
+      puts "DBG: match_ases_for_best_total(total, as_value) = #{match_ases_for_best_total(total, as_value).inspect}"
+      match_ases_for_best_total(total, as_value)
+    end
+
+    def match_ases_for_best_total(total, as_value)
+      if total <= 11
+        as_value != 0 ? total += 10 : total
+      else
+        total
+      end
+    end
+
+    def check_who_won(player_hand, dealer_hand)
+      if checking_points(player_hand) <= 21 && checking_points(dealer_hand) <= 21
+        checking_points(player_hand) <=> checking_points(dealer_hand)
+      elsif checking_points(player_hand) > 21
+        -1
+      else
+         1
+      end
+    end
+
+  end
+
+end

views/blackjack/bet.erb

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+
+<br>
+<h1>Set the amount you want to bet</h1>
+<br>
+<h3>Your balance is: <%=player_bankroll%></h3>
+<br>
+<form action="/bet" method="post">
+  <textarea type="text" name="amount"></textarea>
+  <br>
+  <input type="submit" value="Accept and start the game">
+</form>
+<br>

views/blackjack/hit.erb

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+
+<br>
+<br>
+<br>
+<br>
+<h2>Dealer's Cards</h2>
+<br>
+<%=dealer_hand[0]%>
+<p>hidden card</p>
+<br>
+<br>
+<h2>Your Cards</h2>
+<br>
+<%player_hand.length.times do |i| %>
+  <%=player_hand[i]%>
+<%end%>
+<br>
+<form action="/hit" method="post">
+  <input type="submit" value="HIT">
+</form>
+<br>
+<form action="/stay" method="post">
+  <input type="submit" value="STAY">
+</form>
+<br>
+<br>
+<h2>BETS</h2>
+<%=player_bet%>
+<br>
+<br>
+<h2>BANK ROLL</h2>
+<%=player_bankroll%>
+<br>
+<br>