ruby

class CommitScore

  ScoreValue = Struct.new(:email, :score)

  def initialize(commit_values)
    @commit_values = commit_values
  end

  def score
    grouped_commits_by_email.map {|(email, commits) score_value(email, commits) }
  end

  private

  def grouped_commits_by_email
    @commit_values.group_by(&:email)
  end

  def score_value(email, commits)
    ScoreValue.new(email, score_commits(commits))
  end

  def score_commits(commits)
    commits.map {|c| score_date(c.committed_date) }.reduce(:+)
  end

  def score_date(date)
    # algo
    1
  end

end