class Chronic::RepeaterDayName

def initialize(type)
  super
  @current_day_start = nil
end

def next(pointer)
  super
  direction = pointer == :future ? 1 : -1
  if !@current_day_start
    @current_day_start = Time.construct(@now.year, @now.month, @now.day)
    @current_day_start += direction * DAY_SECONDS
    day_num = symbol_to_number(@type)
    while @current_day_start.wday != day_num
      @current_day_start += direction * DAY_SECONDS
    end
  else
    @current_day_start += direction * 7 * DAY_SECONDS
  end
  Chronic::Span.new(@current_day_start, @current_day_start + DAY_SECONDS)
end

def symbol_to_number(sym)
  lookup = {:sunday => 0, :monday => 1, :tuesday => 2, :wednesday => 3, :thursday => 4, :friday => 5, :saturday => 6}
  lookup[sym] || raise("Invalid symbol specified")
end

def this(pointer = :future)
  super
  pointer = :future if pointer == :none
  self.next(pointer)
end

def to_s
  super << '-dayname-' << @type.to_s
end

def width
  DAY_SECONDS
end