about_scoring_project.rb

require File.expand_path(File.dirname(__FILE__) + '/edgecase')

# Greed is a dice game where you roll up to five dice to accumulate
# points.  The following "score" function will be used calculate the
# score of a single roll of the dice.
#
# A greed roll is scored as follows:
#
# * A set of three ones is 1000 points
#
# * A set of three numbers (other than ones) is worth 100 times the
#   number. (e.g. three fives is 500 points).
#
# * A one (that is not part of a set of three) is worth 100 points.
#
# * A five (that is not part of a set of three) is worth 50 points.
#
# * Everything else is worth 0 points.
#
#
# Examples:
#
# score([1,1,1,5,1]) => 1150 points
# score([2,3,4,6,2]) => 0 points
# score([3,4,5,3,3]) => 350 points
# score([1,5,1,2,4]) => 250 points
#
# More scoring examples are given in the tests below:
#
# Your goal is to write the score method.

def score(dice)
	
  computeTriples(dice) + computeSingles(dice)

end

FIVE_VALUE = 50
ONE_VALUE  = 100

def computeSingles(diceRoll)
	result = 0
	diceRoll.each do |roll|
  	  rollScore = 0
  	  rollScore = rollScore	 + FIVE_VALUE  	if roll == 5
  	  rollScore = rollScore + ONE_VALUE	if roll == 1
  	  result   += rollScore
  	end
  	result
end

TRIPLE_FACTOR               = 100
TRIPLE_ONE_VALUE 	     = 1000
TRIPLE_ONE_VALUE_AS_SINGLES  = 3 * ONE_VALUE
TRIPLE_FIVE_VALUE_AS_SINGLES = 3 * FIVE_VALUE

def computeTriples(diceRoll)
	result   = 0
	asString = diceRoll.sort.to_s
	for points in (1..6) do
	  prepattern="#{points}, #{points}, #{points}"
	  pattern = /#{prepattern}/
	  if ( asString [pattern])
	      tripleScore = ( points * TRIPLE_FACTOR )
	      tripleScore = ( TRIPLE_ONE_VALUE - TRIPLE_ONE_VALUE_AS_SINGLES ) if ( points == 1)
	      tripleScore = tripleScore - TRIPLE_FIVE_VALUE_AS_SINGLES 	  if ( points == 5)
	      result	  =  tripleScore
	  end
  	end
  	result
end 



class AboutScoringProject < EdgeCase::Koan
  def test_score_of_an_empty_list_is_zero
    assert_equal 0, score([])
  end

  def test_score_of_a_single_roll_of_5_is_50
    assert_equal 50, score([5])
  end

  def test_score_of_a_single_roll_of_1_is_100
    assert_equal 100, score([1])
  end

  def test_score_of_multiple_1s_and_5s_is_the_sum_of_individual_scores
    assert_equal 300, score([1,5,5,1])
  end

  def test_score_of_single_2s_3s_4s_and_6s_are_zero
    assert_equal 0, score([2,3,4,6])
  end

  def test_score_of_a_triple_1_is_1000
    assert_equal 1000, score([1,1,1])
  end

  def test_score_of_other_triples_is_100x
    assert_equal 200, score([2,2,2])
    assert_equal 300, score([3,3,3])
    assert_equal 400, score([4,4,4])
    assert_equal 500, score([5,5,5])
    assert_equal 600, score([6,6,6])
  end

  def test_score_of_mixed_is_sum
    assert_equal 250, score([2,5,2,2,3])
    assert_equal 550, score([5,5,5,5])
  end

end