class Chronic::Season

def self.find_next_season(season, pointer)
  lookup = [:spring, :summer, :autumn, :winter]
  next_season_num = (lookup.index(season) + 1 * pointer) % 4
  lookup[next_season_num]
end

def self.season_after(season)
  find_next_season(season, +1)
end

def self.season_before(season)
  find_next_season(season, -1)
end

def initialize(start_date, end_date)
  @start = start_date
  @end = end_date
end