app.rb

require_relative 'cookbook'    # You need to create this file!
require_relative 'controller'  # You need to create this file!
require_relative 'router'

csv_file   = File.join(__dir__, 'recipes.csv')
cookbook   = Cookbook.new(csv_file)
controller = Controller.new(cookbook)

router = Router.new(controller)

# Start the app
router.run

controller.rb

require_relative 'view'
require_relative 'recipe'

class Controller
  def initialize(cookbook)
    @view = View.new
    @cookbook = cookbook
  end

  def create
    # ask the user for recipe name
    # ask user for recipe description
    recipe_info = @view.ask_for_recipe
    # instantiate a Recipe Object
    new_recipe = Recipe.new(recipe_info[0], recipe_info[1])
    # store the recipe object in the Repository
    @cookbook.add_recipe(new_recipe)
  end

  def list
    # Ask the Cookbook for all the recipes
    recipe_array = @cookbook.all
    # Show them to the user
    @view.display(recipe_array)
  end
  # List all recipes
  # DElete a recipe

  def destroy
    # list all the recipes for the user
    list
    # ask the user which recipe should be deleted
    recipe_index = @view.ask_for_index
    # tell the repository to DELETE that recipe
    @cookbook.remove_recipe(recipe_index)
  end
end

cookbook.rb

require 'csv'
class Cookbook
  def initialize(filepath)
    @recipes = []
    @filepath = filepath
    load_from_csv
  end

  def add_recipe(recipe)
    @recipes << recipe
    save_to_csv
  end

  def all
    @recipes
  end

  def remove_recipe(index)
    @recipes.delete_at(index)
    save_to_csv
  end

  def save_to_csv
    CSV.open(@filepath, 'wb') do |csv|
      @recipes.each do |recipe|
        csv << [recipe.name, recipe.description]
      end
    end
  end

  def load_from_csv
    CSV.foreach(@filepath) do |row|
      @recipes << Recipe.new(row[0], row[1])
    end
  end
end

recipe.rb

class Recipe
  attr_reader :name, :description
  def initialize(name, description)
    @name = name
    @description = description
  end
end

recipes.csv

router.rb

class Router
  def initialize(controller)
    @controller = controller
    @running    = true
  end

  def run
    puts "Welcome to the Cookbook!"
    puts "           --           "

    while @running
      display_tasks
      action = gets.chomp.to_i
      print `clear`
      route_action(action)
    end
  end

  private

  def route_action(action)
    case action
    when 1 then @controller.list
    when 2 then @controller.create
    when 3 then @controller.destroy
    when 4 then stop
    else
      puts "Please press 1, 2, 3 or 4"
    end
  end

  def stop
    @running = false
  end

  def display_tasks
    puts ""
    puts "What do you want to do next?"
    puts "1 - List all recipes"
    puts "2 - Create a new recipe"
    puts "3 - Destroy a recipe"
    puts "4 - Stop and exit the program"
  end
end

view.rb

class View
  def ask_for_recipe
    puts "Whats the name of your recipe?"
    name = gets.chomp
    puts "What's the description of your recipe?"
    description = gets.chomp
    return [name, description]
  end

  def display(recipe_array)
    recipe_array.each_with_index do |recipe, index|
      puts "#{index + 1} - #{recipe.name}: #{recipe.description}"
    end
  end

  def ask_for_index
    puts "What is the number of the recipe to be discarded?"
    gets.chomp.to_i - 1
  end
end