Code help: Ruby III challenge.rb

require 'pry'

def good_input?(input)
  if !(input =~ /^(\d*)\.\d{2}$/)
    return false
  end

  true
end

puts "Welcome to James' coffee emporium!"

puts "Please choose your selection:"
puts "1) Add item - $5.00 - Light Bag"
puts "2) Add item - $7.50 - Medium Bag"
puts "3) Add item - $9.75 - Bold Bag"
puts "4) Complete Sale"

# price = {
#   1 => 5.00,
#   2 => 7.50,
#   3 => 9.75,
#   4 => 4
# }

# Instead, create a hash where each product is represented by another hash.
# This will let us access the type and price again later when we need to.
items = {
  1 => { style: 'light', price: 5.00 },
  2 => { style: 'medium', price: 7.50 },
  3 => { style: 'dark', price: 9.75 }
}

selection = 0
subtotal = 0
# We'll use this below in order to store all of the individual transactions
transactions = []

while selection != 4
  puts "\n" + "Makes a selection:"
  print "> "

  # Use the new items hash to find selected item
  selection = gets.chomp.to_i

  # Break out of the loop if somebody chooses 4
  break if selection == 4

  item = items[selection]

  puts "How many bags?"
  print "> "
  # I think renaming this to quantity better describes the value
  quantity  = gets.chomp

  # This will give us the total for the current transaction
  transaction_total = quantity.to_f * item[:price].to_f

  # We can store the recorded transaction by making another hash that has
  # values that will let us which item was purchased and how much of it.
  transaction = { item: item, quantity:  quantity, total: transaction_total }

  # Here we add the transaction that we just created to our array that contains
  # all of the transactions that we've created.
  #
  # We can now reference all of the transactions whenever we want to calculate
  # the current subtotal or list all of the transactions.
  transactions << transaction

  # We can use the transaction_total here to add to our overall subtotal
  subtotal += transaction_total
  puts "\n" + "Subtotal: $#{sprintf( "%0.02f", subtotal)}" 
end

puts "\n" + "===Sale Complete==="
puts

# Here we can loop through all of the transactions and print out the
# information that we're looking for because it's stored in each transaction.
transactions.each do |transaction|
  puts "#{transaction[:total]} - #{transaction[:quantity]} #{transaction[:item][:style]}"
end

puts
puts "Total: $#{sprintf( "%0.02f", subtotal)}"
puts
puts "What is the amount tendered?"
print "> $"
paid = gets.chomp.to_f
puts

change_due = paid - subtotal

if paid.to_f < subtotal.to_f
  due = (subtotal.to_f - paid.to_f)
  puts "Excuse me, you still owe $#{sprintf( "%0.02f", due)}"
else 
  change = paid.to_f - subtotal.to_f 

  puts "===Thank You!==="
  puts "Change due is $#{sprintf( "%0.02f", change_due)}"
  puts 
  puts "\n" + Time.now.strftime( "%m/%d/%Y %I:%M%p" )
  puts "===================="
end