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)
  result = 0
  
  # First idea: loop through all values and add to hash but only 
  # once per unique value and have a counter for how many times 
  # value was found
  
  # The param for the new() method call acts as a default value if 
  # an accessed key doesn't exist. Awesome! Saved me from writing a 
  # bloated each statement with an if/elsif to handle existence!
  counts = Hash.new(0) 
  
  dice.each do |value|
    counts[value] += 1
  end
  
  counts.each do |item,numFound|
    # 1,1,1 = 1000 points
    if item == 1 && numFound >= 3 then
      result += 1000
      numFound -= 3
    end
    
    # any number other than 1, found 3 times is that number times 
    # 100.. so 5,5,5 = 500 points, 3,3,3 = 300 points, etc.
    if item != 1 && numFound >= 3 then
      result += item * 100
      numFound -= 3
    end
    
    # 1 (not part of set) = 100 points for each found
    if item == 1 && numFound <= 2 then 
      result += 100 * numFound
    end
    
    # 5 (not part of set) = 50 points for each found
    if item == 5 && numFound <=2 then
      result += 50 * numFound
    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
