class Chronic::RepeaterWeekday

def initialize(type)
  super
  @current_weekday_start = nil
end

def is_weekday?(day)
  !is_weekend?(day)
end

def is_weekend?(day)
  day == symbol_to_number(:saturday) || day == symbol_to_number(:sunday)
end

def next(pointer)
  super
  direction = pointer == :future ? 1 : -1
  if !@current_weekday_start
    @current_weekday_start = Time.construct(@now.year, @now.month, @now.day)
    @current_weekday_start += direction * DAY_SECONDS
    until is_weekday?(@current_weekday_start.wday)
      @current_weekday_start += direction * DAY_SECONDS
    end
  else
    loop do
      @current_weekday_start += direction * DAY_SECONDS
      break if is_weekday?(@current_weekday_start.wday)
    end
  end
  Span.new(@current_weekday_start, @current_weekday_start + DAY_SECONDS)
end

def offset(span, amount, pointer)
  direction = pointer == :future ? 1 : -1
  num_weekdays_passed = 0; offset = 0
  until num_weekdays_passed == amount
    offset += direction * DAY_SECONDS
    num_weekdays_passed += 1 if is_weekday?((span.begin+offset).wday)
  end
  span + offset
end

def symbol_to_number(sym)
  DAYS[sym] || raise("Invalid symbol specified")
end

def this(pointer = :future)
  super
  case pointer
  when :past
    self.next(:past)
  when :future, :none
    self.next(:future)
  end
end

def to_s
  super << '-weekday'
end

def width
  DAY_SECONDS
end