disasters.rb

class Disasters
  attr_reader :name, :yield_destroyed, :probability

  def initialize(name, yield_destroyed, probability)
    @probability = probability
    @name = name
    @yield_destroyed = yield_destroyed
  end
end

driver.rb

require_relative 'other_fruit'

tree = OrangeTree.new

tree.age! until tree.any_fruit?

puts "Tree is #{tree.age} years old and #{tree.height} feet tall"

until tree.dead?
  sleep(0.2)
  basket = []

  # It places the oranges in the basket
  # IT PLACES THE ORANGES IN THE BASKET
  while tree.any_fruit?
    basket << tree.pick_a_fruit!
  end

  diameter_sum = basket.inject(0) {|sum, v| sum + v.diameter}

  avg_diameter = (diameter_sum/basket.length).round(2)

  puts "Year #{tree.age} Report"
  if tree.disaster == nil
    puts "Tree height: #{tree.height} feet"
    puts "Weather: #{tree.weather.name}"
    puts "Harvest:     #{basket.size} #{tree.fruit_class.to_s.downcase}#{'s' unless basket.size == 1} with an average diameter of #{avg_diameter} inches"
    puts ""
  else
    puts "AHHHHHHHHH"
    puts "DISTASTAAAHHH"
    puts "#{tree.disaster.name} You managed to scrounge up #{basket.size} oranges"
    puts ""
  end  

  # Age the tree another year
  tree.age!
end

puts "Awwwwwww sh!t, ze tree - she is dead!"

fruit_tree.rb

require_relative 'weather'
require_relative 'disasters'

class FruitTree
  attr_reader :age, :height, :dead, :fruit, :fruit_class, :weather, :disaster
  WEATHER = [Weather.new('Drought', (0.5), (0.15)),
   Weather.new('Wicked Gorgeous', (1.25), (0.20)),
   Weather.new('Flood', (0.25), (0.15)),
   Weather.new('Early Frost', (0.75), (0.15)),
   Weather.new('Great weather!', (1.0), (0.30)),
   Weather.new('UFO sighting - Best Harvest Ever!', (30.0), (0.05))]

   DISASTERS = [Disasters.new('Tornado!', (0.85), (0.1)),
    Disasters.new('Earthquake!', (0.90), (0.05)),
    Disasters.new('GODZILLA!!!', (1.00), (0.05)),
    Disasters.new('Plague of Locusts!', (0.75), (0.10)),
    Disasters.new('Volcano Erupts!', (0.99), (0.08)),
    Disasters.new('Hurricane!', (0.95), (0.12))]

    def initialize
      @fruit_class = Fruit
      @age = 0
      @height = 0
      @dead = false
      @fruit = []
      @avg_max_height = 0
      @tree_dies_at = 0
      @produces_fruit_at = 0
    end

    def age!
      choose_weather
      @height = (@height + grow).round(2)
      @dead = true if @age >= @tree_dies_at
      @age += 1
      produce_fruit
      disaster!
    end

    def grow
      ((@avg_max_height - @height) * 0.1).round(2) * (weather == WEATHER[5] ? 1 : @weather.growth)
    end

    def disaster!
      @disaster = DISASTERS.sample
      num = (rand() < @disaster.probability ? @disaster.yield_destroyed : 0)
      num == 0 ? @disaster = nil : (num * @fruit.length).to_i.times {@fruit.pop}
    end

    def choose_weather
      weather_c = 0
      until weather_c > 0
        @weather = WEATHER.sample
        weather_c = weather.growth if rand() < weather.probability
      end
    end

    def produce_fruit
      (@weather.growth*@height*(3*rand()+1)).to_i.times {@fruit << @fruit_class.new} if @age >= @produces_fruit_at
      if @weather == WEATHER[5]
        @fruit.map {|i| i.diameter *= 5}
      end
    end

    def dead?
      @dead
    end

    def any_fruit?
      @fruit.any?
    end

    def pick_a_fruit!
      raise NoFruitError, "This tree is barren" unless self.any_fruit?
      return @fruit.slice!(rand(@fruit.length))
    end

  end

  class Fruit
    attr_reader :ripe
    attr_accessor :diameter

    def initialize
      @ripe = false
    end

  end



# growth factor = (a*c*e^((c+x)/b))/(b*(e^(c/b)+e^(x/b)))^2

other_fruit.rb

require_relative 'fruit_tree'

class Orange < Fruit
  def initialize
    super
    @min_diameter = 2
    @max_diameter = 4
    @diameter = ((@max_diameter - @min_diameter) * rand() + @min_diameter).round(2)
  end
end

class OrangeTree < FruitTree

  def initialize
    super
    @fruit_class = Orange
    @avg_max_height = 30
    @tree_dies_at = 50
    @produces_fruit_at = 4
  end
end

class Apple < Fruit
  def initialize
    super
    @min_diameter = 1
    @max_diameter = 3
    @diameter = ((@max_diameter - @min_diameter) * rand() + @min_diameter).round(2)
  end
end

class AppleTree < FruitTree

  def initialize
    super
    @fruit_class = Apple
    @avg_max_height = 15
    @tree_dies_at = 20
    @produces_fruit_at = 5
  end
end

weather.rb

class Weather
  attr_reader :name, :growth, :probability

  def initialize(name, growth, probability)
    @probability = probability
    @name = name
    @growth = growth
  end
end