interface.rb

# Items and prices
store_items = {
  kiwi: 1.25,
  banana: 0.5,
  mango: 4.0,
  asparagus: 9.0
}

# Create a shopping cart for the user
shopping_cart = Hash.new(0)

puts 'Welcome to Instacart'

# List the available items
puts "In our store today:"
store_items.each do |name, price|
  puts "#{name}: R$#{price}"
end

# Loop asks adding items to cart.
loop do
  puts "Which item? (or 'quit' to checkout)"
  user_input = gets.chomp
  # Breaks if user wants to 'quit'
  break if user_input == 'quit'

  puts "How many #{user_input} do you want to add?"
  item_quantity = gets.chomp.to_i

  # Increments the cart by the quantity decided by the user
  shopping_cart[user_input.to_sym] += item_quantity
end

# Diplay the shop list
# And calculate the shopping_cart_price
shopping_cart_price = 0
puts "-------BILL---------"
shopping_cart.each do |name, quantity|
  price = store_items[name]
  total_price = price * quantity
  shopping_cart_price += total_price
  puts "#{name}: #{quantity} X R$#{price} = R$#{total_price}"
end

# Displays checkout
puts "TOTAL: R$#{shopping_cart_price}"
puts "--------------------"