Bowling challenge in Ruby

.rspec

@@ -0,0 +1 @@
+--require spec_helper

Gemfile

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# gem "rails"
+
+gem "rspec", "~> 3.12"

Gemfile.lock

@@ -0,0 +1,26 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.5.0)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.0)
+
+PLATFORMS
+  arm64-darwin-22
+
+DEPENDENCIES
+  rspec (~> 3.12)
+
+BUNDLED WITH
+   2.4.12

app.rb

@@ -0,0 +1,7 @@
+require_relative 'lib/game'
+require_relative 'lib/frame'
+
+game = Game.new
+game.run_game
+game.calculate_score
+puts "Total score: #{game.grand_total}"

lib/frame.rb

@@ -0,0 +1,68 @@
+class Frame
+  attr_accessor :rolls, :bonus_points
+
+  def initialize(io=Kernel)
+    @io = io
+    @rolls = []
+    @bonus_points = 0
+  end
+
+  def play_regular_frame
+    roll_first_ball
+    if @rolls.first == 10
+      print_strike_message
+      return
+    end
+    roll_second_ball
+    print_spare_message if @rolls.inject(:+) == 10
+  end
+
+  def play_last_frame
+    roll_first_ball
+    if @rolls.first == 10
+      print_strike_message
+      roll_bonus_ball
+      roll_second_bonus_ball
+      return
+    end
+    roll_second_ball
+    if @rolls.inject(:+) == 10
+      print_spare_message
+      roll_bonus_ball
+    end
+  end
+
+  private
+
+  def roll_first_ball
+    @io.puts "Roll first ball:"
+    roll = @io.gets.chomp.to_i
+    @rolls << roll
+  end
+
+  def print_strike_message
+    @io.puts "Strike!"
+  end
+
+  def roll_second_ball
+    @io.puts "Roll second ball:"
+    roll = @io.gets.chomp.to_i
+    @rolls << roll
+  end
+
+  def print_spare_message
+    @io.puts "Spare!"
+  end
+
+  def roll_bonus_ball
+    @io.puts "Roll bonus ball:"
+    bonus_roll = @io.gets.chomp.to_i
+    @rolls << bonus_roll
+  end
+
+  def roll_second_bonus_ball
+    @io.puts "Roll second bonus ball:"
+    bonus_roll = @io.gets.chomp.to_i
+    @rolls << bonus_roll
+  end
+end

lib/game.rb

@@ -0,0 +1,85 @@
+require_relative './frame'
+
+class Game
+  attr_accessor :frames
+  attr_reader :grand_total
+
+  def initialize(io=Kernel)
+    @io = io
+    @frames = []
+    10.times { @frames << Frame.new(@io) }
+    @gutter_game = false
+    @perfect_game = false
+    @grand_total = 0
+  end
+
+  def gutter_game
+    @gutter_game = true
+  end
+
+  def gutter_game?
+    @gutter_game
+  end
+
+  def perfect_game
+    @perfect_game = true
+  end
+
+  def perfect_game?
+    @perfect_game
+  end
+
+  def run_game
+    for i in 1..9 do
+      @io.puts "Frame #{i}:"
+      @frames[i-1].play_regular_frame
+    end
+
+    @io.puts "Frame 10:"
+    @frames.last.play_last_frame
+  end
+
+  def calculate_score
+    award_bonus_points
+    award_bonus_points_in_penultimate_frame
+    sum_all_points
+    @gutter_game = true if @grand_total == 0
+    @perfect_game = true if @grand_total == 300
+  end
+
+  def award_bonus_points
+    for i in 0..7 do
+      # If player made a strike
+      if @frames[i].rolls.include?(10)
+        @frames[i].bonus_points += @frames[i+1].rolls.first
+        # If subsequent frame had two rolls
+        if @frames[i+1].rolls.length == 2
+          @frames[i].bonus_points += @frames[i+1].rolls.last
+        # Else they must have bowled a strike
+        else
+          @frames[i].bonus_points += @frames[i+2].rolls.first
+        end
+      # If player made a spare
+      elsif @frames[i].rolls.inject(:+) == 10
+        @frames[i].bonus_points += @frames[i+1].rolls.first
+      end
+    end
+  end
+
+  def award_bonus_points_in_penultimate_frame
+    # If player made a strike
+    if @frames[8].rolls.include?(10)
+      @frames[8].bonus_points += (@frames.last.rolls.first + @frames.last.rolls[1])
+    # If player made a spare
+    elsif @frames[8].rolls.inject(:+) == 10
+      @frames[8].bonus_points += @frames.last.rolls.first
+    end
+  end
+
+  def sum_all_points
+    @frames.each do |frame|
+      @grand_total += frame.rolls.inject(0, :+)
+      @grand_total += frame.bonus_points
+    end
+  end
+end

spec/frame_spec.rb

@@ -0,0 +1,15 @@
+require 'frame'
+
+
+describe Frame do
+  let(:frame) { Frame.new }
+  it "initializes with an empty array @rolls" do
+    expect(frame.rolls).to be_an_instance_of Array
+    expect(frame.rolls.empty?).to be_truthy
+  end
+
+  it "initializes with bonus points set to 0" do
+    expect(frame.bonus_points).to eq 0
+  end
+
+end

spec/game_spec.rb

@@ -0,0 +1,131 @@
+require 'game'
+require 'frame'
+
+describe Game do
+  let(:io) { double(:io) }
+  let(:game) { Game.new(double(:io)) }
+
+  it "intializes with an array of 10 frames" do
+    expect(game.frames.first).to be_an_instance_of Frame
+    expect(game.frames.first.rolls.empty?).to eq true
+    expect(game.frames.length).to eq 10
+  end
+
+  it "intializes with gutter_game? and perfect_game? set to false" do
+    expect(game.gutter_game?).to eq false
+    expect(game.perfect_game?).to eq false
+  end
+
+  it "scores a perfect game 300" do
+    io = double(:io)
+    for i in 1..10
+      expect(io).to receive(:puts).with("Frame #{i}:")
+      expect(io).to receive(:puts).with("Roll first ball:")
+      expect(io).to receive(:gets).and_return('10')  
+      expect(io).to receive(:puts).with("Strike!")
+    end
+    expect(io).to receive(:puts).with("Roll bonus ball:")
+    expect(io).to receive(:gets).and_return('10')  
+    expect(io).to receive(:puts).with("Roll second bonus ball:")
+    expect(io).to receive(:gets).and_return('10')  
+    game = Game.new(io)
+    game.run_game
+    game.calculate_score
+    expect(game.grand_total).to eq 300
+    expect(game.perfect_game?).to eq true
+  end
+
+  it "scores a gutter game 0" do
+    io = double(:io)
+    for i in 1..10
+      expect(io).to receive(:puts).with("Frame #{i}:")
+      expect(io).to receive(:puts).with("Roll first ball:")
+      expect(io).to receive(:gets).and_return('0')  
+      expect(io).to receive(:puts).with("Roll second ball:")
+      expect(io).to receive(:gets).and_return('0') 
+    end
+    game = Game.new(io)
+    game.run_game
+    game.calculate_score
+    expect(game.grand_total).to eq 0
+    expect(game.perfect_game?).to eq false
+    expect(game.gutter_game?).to eq true
+  end
+
+  it "scores an example game correctly" do
+    io = double(:io)
+    expect(io).to receive(:puts).with("Frame 1:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('1')  
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('4')  
+
+    expect(io).to receive(:puts).with("Frame 2:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('4') 
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('5')  
+
+    expect(io).to receive(:puts).with("Frame 3:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('6') 
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('4') 
+    expect(io).to receive(:puts).with("Spare!") 
+
+    expect(io).to receive(:puts).with("Frame 4:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('5') 
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('5')  
+    expect(io).to receive(:puts).with("Spare!") 
+
+    expect(io).to receive(:puts).with("Frame 5:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('10') 
+    expect(io).to receive(:puts).with("Strike!")
+
+    expect(io).to receive(:puts).with("Frame 6:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('0') 
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('1')  
+
+    expect(io).to receive(:puts).with("Frame 7:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('7') 
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('3')  
+    expect(io).to receive(:puts).with("Spare!") 
+
+    expect(io).to receive(:puts).with("Frame 8:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('6') 
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('4')  
+    expect(io).to receive(:puts).with("Spare!") 
+
+    expect(io).to receive(:puts).with("Frame 9:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('10') 
+    expect(io).to receive(:puts).with("Strike!")
+
+    expect(io).to receive(:puts).with("Frame 10:")
+    expect(io).to receive(:puts).with("Roll first ball:")
+    expect(io).to receive(:gets).and_return('2') 
+    expect(io).to receive(:puts).with("Roll second ball:")
+    expect(io).to receive(:gets).and_return('8') 
+    expect(io).to receive(:puts).with("Spare!")  
+    expect(io).to receive(:puts).with("Roll bonus ball:")
+    expect(io).to receive(:gets).and_return('6') 
+
+
+    game = Game.new(io)
+    game.run_game
+    game.calculate_score
+    expect(game.grand_total).to eq 133
+    expect(game.perfect_game?).to eq false
+    expect(game.gutter_game?).to eq false
+
+  end
+end