class Chronic::RepeaterYear

def build_offset_time(time, amount, direction)
  year = time.year + (amount * direction)
  days = month_days(year, time.month)
  day = time.day > days ? days : time.day
  Time.construct(year, time.month, day, time.hour, time.min, time.sec)
end

def initialize(type)
  super
end

def month_days(year, month)
  if Date.leap?(year)
    RepeaterMonth::MONTH_DAYS_LEAP[month - 1]
  else
    RepeaterMonth::MONTH_DAYS[month - 1]
  end
end

def next(pointer)
  super
  if !@current_year_start
    case pointer
    when :future
      @current_year_start = Time.construct(@now.year + 1)
    when :past
      @current_year_start = Time.construct(@now.year - 1)
    end
  else
    diff = pointer == :future ? 1 : -1
    @current_year_start = Time.construct(@current_year_start.year + diff)
  end
  Span.new(@current_year_start, Time.construct(@current_year_start.year + 1))
end

def offset(span, amount, pointer)
  direction = pointer == :future ? 1 : -1
  new_begin = build_offset_time(span.begin, amount, direction)
  new_end   = build_offset_time(span.end, amount, direction)
  Span.new(new_begin, new_end)
end

def this(pointer = :future)
  super
  case pointer
  when :future
    this_year_start = Time.construct(@now.year, @now.month, @now.day) + RepeaterDay::DAY_SECONDS
    this_year_end = Time.construct(@now.year + 1, 1, 1)
  when :past
    this_year_start = Time.construct(@now.year, 1, 1)
    this_year_end = Time.construct(@now.year, @now.month, @now.day)
  when :none
    this_year_start = Time.construct(@now.year, 1, 1)
    this_year_end = Time.construct(@now.year + 1, 1, 1)
  end
  Span.new(this_year_start, this_year_end)
end

def to_s
  super << '-year'
end

def width
  YEAR_SECONDS
end