class Date
  include ErrorHelper

  def self.build_date_array(start_date, end_date)
    start_date = start_date.to_date
    end_date   =  end_date.to_date

    raise_start_date_before_end_date if (start_date > end_date)

    date_array = []
    processable_date = start_date.dup
    while processable_date <= end_date
      date_array << processable_date
      processable_date = processable_date.tomorrow
    end

    return date_array
  end

  def build_date_array(date)
    date = date.to_date

    if self < date
      start_date = self
      end_date = date
    else
      start_date = date
      end_date = self
    end

    return Date.build_date_array(start_date, end_date)
  end

end