require 'date'

module Scheduling
class Yearly < Struct.new(:month, :mday)
  def occurances time_range
    raise RangeDecreasingError if time_range.decreasing?
    cur = Date.new(time_range.min.year, month, mday)

    start = time_range.min
    if cur < start
      cur = cur.next_year
    end

    occurances = []

    stop = time_range.last
    if time_range.exclude_end?
      stop -= 1
    end

    while cur <= stop
      occurances.push cur
      cur = cur.next_year
    end

    return occurances
  end
end
end