interface.rb

# - Create and assign to a variable, the store items
#               fruit price
store_items = { kiwi: 1.25, apple: 9, coconut: 0.5 }


# - Create a cart
cart = { kiwi: 0, apple: 0, coconut: 0 }

puts "----------------------"
puts " Welcome to Instacart "
puts "----------------------"
# - Print the store items
#                    key    value
store_items.each do |fruit, price|
  puts "#{fruit} ... $#{price}"
end


puts "--------------------"
loop do
  # - ask the user to add an item or quit
  puts "Which item? (or 'quit' to checkout)"
  user_input = gets.chomp
  if user_input == "quit" || user_input == "q"
    puts "Thank you. Proceed to checkout."
    break
  else
    puts "How many you want to add?"
    user_quantity = gets.chomp.to_i
    cart[user_input.to_sym] += user_quantity
  end
end

puts "--------------BILL----------------"
bill_sum = 0
cart.each do |fruit, quantity|
  price = store_items[fruit]
  subtotal = quantity * price
  bill_sum += subtotal

  puts "#{fruit}: #{quantity} X $#{price} = $#{subtotal}"
end
puts " TOTAL: $#{bill_sum}"
puts "----------------------------------"