osbridge/openconferenceware

module OpenConferenceWare
  module ScheduleOverlapsMixin
    def overlaps?(object)
      raise ArgumentError unless object.respond_to?(:start_time) && object.respond_to?(:end_time)
      if self.start_time != self.end_time && object.start_time != object.end_time
        (self.start_time.to_i..self.end_time.to_i).overlaps?(object.start_time.to_i..object.end_time.to_i) && (self.end_time != object.start_time && self.start_time != object.end_time)
      else
        self.start_time == object.start_time
      end
    end
  end
end