prs.rb

# 1. PRS is a game between two players.  Players pick a hand; either "Rock", "Paper", or "Scissors".
# 2. One hand is compared against the other and either 1) it is a tie, 2) rock > scissors; 3) scissors > paper; 4) paper > rock.

require 'pry'

class Player
  attr_accessor :choice
  attr_reader :name

  def initialize(name = nil)
    if name
      @name = name
    else
      puts "Please enter your name:"
      @name = gets.chomp
    end
  end
end

class Human < Player
  def pick_hand
    begin
      puts "#{name}, please choose your weapon (p, r, s):"
      c = gets.chomp.downcase
    end until Game::CHOICES.keys.include?(c)

    self.choice = c
  end
end

class Computer < Player
  def pick_hand
    self.choice = Game::CHOICES.keys.sample
  end
end

class Game

  CHOICES = {'p' => 'Paper', 'r' => 'Rock', 's' => 'Scissors'}

  attr_reader :human, :computer
	
  def initialize 
    welcome
    @human = Human.new
    @computer = Computer.new("Hal9000")
  end

  def welcome
    puts "Let's play Paper, Rock, Scissors!"
  end

  def display_hand(player)
    case player.choice
    when 'p'
      puts "#{player.name} has Paper."
    when 'r'
      puts "#{player.name} has Rock."
    when 's'
      puts "#{player.name} has Scissors."
    end

    sleep(1)
  end

  def display_hands
    display_hand human
    display_hand computer
  end

  def display_winning_move
    choices = [human.choice, computer.choice]
    case choices.sort
    when ["p", "r"].sort
      puts "Paper wraps Rock, so..."
    when ["r", "s"].sort
      puts "Rock crushes Scissors, so..."
    when ["s", "p"].sort
      puts "Scissors cuts Paper, so..."
    else
      puts "Each of you has the same weapon, so..."
    end
  end

  def compare_hands
    if human.choice == computer.choice
      puts "It's a tie!"
    elsif (human.choice == 'p' && computer.choice == 'r') ||
          (human.choice == 'r' && computer.choice == 's') || 
          (human.choice == 's' && computer.choice == 'p')
      puts "#{human.name} wins!"
    else
      puts "#{computer.name} wins!"
    end
  end

  def play_again?
    puts "Would you like to play again? (y/n)"
    play_again = gets.chomp.downcase
    if play_again != 'y'
      false
    end
  end


  def play
    begin
      human.pick_hand
      computer.pick_hand
      display_hands
      display_winning_move
      compare_hands
    end until play_again? == false
  end

end

Game.new.play