#!/usr/bin/env ruby

=begin
|====================================|
| Req Ruby Ver | Req Ruby Gems Ver   |
|--------------|---------------------|
| v2.4.0       | v2.6.11             |
|====================================|
=end

class PlayRockPaperScissorsGame 

  require "colorized_string";
  ColorizedString.colors   
  ColorizedString.modes    

  class RPS

    protected;
    module Constants 
      NTRY_TO_SYM = { 'p' => :PAPER,  'r' => :ROCK, 's' => :SCISSORS }; 
      VALID_ENTRIES = NTRY_TO_SYM.keys; 
      COMPUTER_CHOICES = NTRY_TO_SYM.values;
      WINNERS = [[:SCISSORS, :PAPER], [:PAPER, :ROCK], [:ROCK, :SCISSORS]]; # format: player choice, computer choice
      LOSERS = WINNERS.map { |i,j| [j,i] }; # this will take the original WINNERS array and flip the symbols, thus returning a loss for the user/player
      INIT_STRINGS = ["You are about to enter a rock-paper-scissors best of 3 match.", "Press the return/enter key to continue...", ""];
    end;

    class RockPaperScissors
      class << self
        def continue(str1, str2, str3)
          puts  ColorizedString[str1].colorize(:color => :green); 
          print ColorizedString[str2].colorize(:color => :green);
          gets; 
          puts  ColorizedString[str3].colorize(:color => :green);
        end; 
      end; 
      continue(Constants::INIT_STRINGS[0], Constants::INIT_STRINGS[1], Constants::INIT_STRINGS[2]);
      def initialize
        @player_score = @computer_score = @ties = 0; 
      end; 
      def play(winning_score) 
        while @player_score < winning_score && @computer_score < winning_score 
          puts ColorizedString["Player score: #{@player_score}, "].colorize(:blue) + 
               ColorizedString["Computer score: #{@computer_score}, Ties: #{@ties}"].colorize(:blue); 
          player = PrivateMethods.player_choice; 
          computer = Constants::COMPUTER_CHOICES.sample; 
          puts ColorizedString["\nPlayer chooses #{player.to_s.downcase}"].colorize(:blue); 
          puts ColorizedString["Computer chooses #{computer.to_s.downcase}"].colorize(:blue);
          case PrivateMethods.player_outcome [player, computer] 
          when :WIN
            puts ColorizedString["#{player.to_s.capitalize} beats #{computer.to_s.downcase}, player wins the round"].colorize(:red); 
            @player_score += 1;
          when :LOSE
            puts ColorizedString["#{computer.to_s.capitalize} beats #{player.to_s.downcase}, computer wins the round"].colorize(:red);
            @computer_score += 1; 
          else 
            puts ColorizedString["Tie, choose again"].colorize(:red); 
            @ties += 1;
          end;
        end;
        puts ColorizedString["\nFinal score: player: #{@player_score}, "].colorize(:blue) +
             ColorizedString["computer: #{@computer_score} (ties: #{@ties})"].colorize(:blue); 
        case PrivateMethods.final_outcome(@player_score, @computer_score)
        when :WIN 
          puts ColorizedString["Player wins!"].colorize(:red); 
        when :LOSE
          puts ColorizedString["Computer wins!"].colorize(:red);
        else 
          puts ColorizedString["It's a tie!"].colorize(:red); 
        end; 
        gets;
      end; 
      private;
      module PrivateMethods
        class << self
          def player_choice
            loop do
              print ColorizedString["Choose rock (r), paper (p) or scissors (s): "].colorize(:green);
              choice = gets.chomp.downcase;
              return Constants::NTRY_TO_SYM[choice] if Constants::NTRY_TO_SYM.key?(choice); 
              puts ColorizedString["That entry is invalid. Please re-enter"].colorize(:green); 
            end; 
          end; 
          def player_outcome(plays)
            return :WIN  if Constants::WINNERS.include?(plays);
            return :LOSE if Constants::LOSERS.include?(plays);
            return :TIE  if (!:WIN || !:LOSE);
          end; 
          def final_outcome(pl, co) 
            return :WIN  if pl > co; 
            return :LOSE if pl < co;
            return :TIE  if pl = co; 
          end; 
        end;
      end;
    end;      
  end;
end; 

PlayRockPaperScissorsGame::RPS::RockPaperScissors.new.play(2); # best of 3