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 list
    # Ask the repo for all the recipes
    recipes = @cookbook.all
    # Tell to the view to display them all
    @view.display_recipes(recipes)
  end

  def create
    # Tell the view to ask the user for the name and description
    recipe_name = @view.ask_for_name
    recipe_description = @view.ask_for_description

    # Create a recipe object
    new_recipe = Recipe.new(recipe_name, recipe_description)

    # Give it to the repo to store it
    @cookbook.add_recipe(new_recipe)
  end

  def destroy
    list

    # Tell the view to ask the user which recipe they want to delete
    recipe_index = @view.ask_for_index

    # Tell the repo to delete that recipe
    @cookbook.remove_recipe(recipe_index)
  end
end

cookbook.rb

require "csv"
require_relative "recipe"

class Cookbook
  def initialize(csv_file_path)
    @csv_file_path = csv_file_path
    @recipes = [] # Recipe instances (not arrays or hashes...)

    CSV.foreach(@csv_file_path) do |row|
      # row == ["cake", "eggs milk and butter"]

      @recipes << Recipe.new(row[0], row[1])
    end
  end

  def all
    @recipes
  end

  def add_recipe(new_recipe)
    @recipes << new_recipe

    save_to_csv
  end

  def remove_recipe(recipe_index)
    @recipes.delete_at(recipe_index)

    save_to_csv
  end

  private

  def save_to_csv
    CSV.open(@csv_file_path, "w") do |csv_file|
      @recipes.each do |recipe|
        csv_file << [recipe.name, recipe.description]
      end
    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 display_recipes(recipes)
    recipes.each_with_index do |recipe, index|
      puts "#{index + 1} - #{recipe.name}: #{recipe.description}"
    end
  end

  def ask_for_name
    puts "Name:"
    recipe_name = gets.chomp
    return recipe_name
  end

  def ask_for_description
    puts "Description:"
    recipe_description = gets.chomp
    return recipe_description
  end

  def ask_for_index
    puts "Index:"
    recipe_index = gets.chomp.to_i - 1
    return recipe_index
  end
end