class Chronic::RepeaterFortnight < Chronic::Repeater #:nodoc:
  FORTNIGHT_SECONDS = 1_209_600 # (14 * 24 * 60 * 60)

  def initialize(type)
    super
    @current_fortnight_start = nil
  end

  def next(pointer)
    super

    if !@current_fortnight_start
      case pointer
      when :future
        sunday_repeater = Chronic::RepeaterDayName.new(:sunday)
        sunday_repeater.start = @now
        next_sunday_span = sunday_repeater.next(:future)
        @current_fortnight_start = next_sunday_span.begin
      when :past
        sunday_repeater = Chronic::RepeaterDayName.new(:sunday)
        sunday_repeater.start = (@now + Chronic::RepeaterDay::DAY_SECONDS)
        2.times { sunday_repeater.next(:past) }
        last_sunday_span = sunday_repeater.next(:past)
        @current_fortnight_start = last_sunday_span.begin
      end
    else
      direction = pointer == :future ? 1 : -1
      @current_fortnight_start += direction * FORTNIGHT_SECONDS
    end

    Chronic::Span.new(@current_fortnight_start, @current_fortnight_start + FORTNIGHT_SECONDS)
  end

  def this(pointer = :future)
    super

    pointer = :future if pointer == :none

    case pointer
    when :future
      this_fortnight_start = Time.construct(@now.year, @now.month, @now.day, @now.hour) + Chronic::RepeaterHour::HOUR_SECONDS
      sunday_repeater = Chronic::RepeaterDayName.new(:sunday)
      sunday_repeater.start = @now
      sunday_repeater.this(:future)
      this_sunday_span = sunday_repeater.this(:future)
      this_fortnight_end = this_sunday_span.begin
      Chronic::Span.new(this_fortnight_start, this_fortnight_end)
    when :past
      this_fortnight_end = Time.construct(@now.year, @now.month, @now.day, @now.hour)
      sunday_repeater = Chronic::RepeaterDayName.new(:sunday)
      sunday_repeater.start = @now
      last_sunday_span = sunday_repeater.next(:past)
      this_fortnight_start = last_sunday_span.begin
      Chronic::Span.new(this_fortnight_start, this_fortnight_end)
    end
  end

  def offset(span, amount, pointer)
    direction = pointer == :future ? 1 : -1
    span + direction * amount * FORTNIGHT_SECONDS
  end

  def width
    FORTNIGHT_SECONDS
  end

  def to_s
    super << '-fortnight'
  end
end