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require '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 scoing examples are given in the tests below:
#
# Your goal is to write the score method.

def score(dice)
  points = 0
  dice_freq = [0, 0, 0, 0, 0, 0, 0]

  # the dice_freq array collects the frequency of each number;
  # the number is the array index, the value is the frequency
  # of the number
  dice.each {|d| dice_freq[d] += 1 }

  # 3 times 1 scores 1000
  if dice_freq[1] >= 3
      points += 1000
      dice_freq[1] -= 3
    end

  # 3 times another value scores 100
  dice_freq.each_with_index do |freq, index|
    if dice_freq[index] >= 3
      points += index * 100
      dice_freq[index] -= 3
    end
  end

  # count remaining 1s and 5s
  points += dice_freq[1] * 100 if dice_freq[1] > 0
  points += dice_freq[5] * 50  if dice_freq[5] > 0

  points
end

class AboutScoringAssignment < 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_mulitple_1s_and_5s_is_the_sum
    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