coffeejamesimproved.rb

#LIGHT = 5
#MEDIUM = 7.5
#BOLD = 9.75

sub_total = 0
sales_list = []

def is_valid_money?(amount)
  !!amount.to_s.match(/\A\d+(\.\d{2})?\z/)
end

def display_change(amount_tendered, subtotal)
  change = amount_tendered.to_f - sub_total.to_f
  puts "===Thank You!==="
  puts "The total change due is $#{change}."
  time_stamp = Time.now.strftime('%D %H:%M %p')
  puts "#{time_stamp}"
  puts"================"
end

while true
  puts "What is the sale price?"
  price = gets.chomp

  break if price == "done"

  if is_valid_money?(price)
    sales_list << price.to_f
    puts "The sale price is $#{price.to_f}"
    sub_total = sales_list.inject(0) {|sum, item_price| sum + item_price}
    puts "Subtotal: $#{sub_total}"
  else
    puts "Invalid amount of currency. Please enter price again with two decimal places/
     or type 'done' to complete transaction."
  end
end

puts "Here are your item prices:"
sales_list.each{|item| puts "$#{item}"}

puts "The total amount due is $#{sub_total}"

puts "What is the amount tendered?"

while false
  amount_tendered = gets.chomp

  if amount_tendered.to_f >= sub_total
    if is_valid_money?(amount_tendered)
      dispsense_change(amount_tendered, subtotal)
      break
    else
      puts "Invalid currency. Please re-enter the amount tendered with two/
        decimal places"
    end
  else
    abort("WARNING: Customer still owes $#{(amount_tendered.to_f-sub_total).abs}. Exiting...")
  end
end