class Chronic::RepeaterDayPortion

def initialize(type)
  super
  if type.kind_of? Integer
    @range = (@type * 60 * 60)..((@type + 12) * 60 * 60)
  else
    @range = PORTIONS[type]
    @range || raise("Invalid type '#{type}' for RepeaterDayPortion")
  end
  @range || raise("Range should have been set by now")
end

def next(pointer)
  super
  full_day = 60 * 60 * 24
  if !@current_span
    now_seconds = @now - Chronic.construct(@now.year, @now.month, @now.day)
    if now_seconds < @range.begin
      case pointer
      when :future
        range_start = Chronic.construct(@now.year, @now.month, @now.day) + @range.begin
      when :past
        range_start = Chronic.construct(@now.year, @now.month, @now.day) - full_day + @range.begin
      end
    elsif now_seconds > @range.end
      case pointer
      when :future
        range_start = Chronic.construct(@now.year, @now.month, @now.day) + full_day + @range.begin
      when :past
        range_start = Chronic.construct(@now.year, @now.month, @now.day) + @range.begin
      end
    else
      case pointer
      when :future
        range_start = Chronic.construct(@now.year, @now.month, @now.day) + full_day + @range.begin
      when :past
        range_start = Chronic.construct(@now.year, @now.month, @now.day) - full_day + @range.begin
      end
    end
    @current_span = Span.new(range_start, range_start + (@range.end - @range.begin))
  else
    case pointer
    when :future
      @current_span += full_day
    when :past
      @current_span -= full_day
    end
  end
end

def offset(span, amount, pointer)
  @now = span.begin
  portion_span = self.next(pointer)
  direction = pointer == :future ? 1 : -1
  portion_span + (direction * (amount - 1) * RepeaterDay::DAY_SECONDS)
end

def this(context = :future)
  super
  range_start = Chronic.construct(@now.year, @now.month, @now.day) + @range.begin
  @current_span = Span.new(range_start, range_start + (@range.end - @range.begin))
end

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

def width
  @range || raise("Range has not been set")
  return @current_span.width if @current_span
  if @type.kind_of? Integer
    return (12 * 60 * 60)
  else
    @range.end - @range.begin
  end
end