module Comee
  module Core
    class Util
      # This method generates document numbers with a certain prefix
      # and a serial suffix
      def self.generate_number(clz, field)
        clz_hash = {
          "PurchaseRequisition" => "PR",
          "PurchaseOrder" => "PO",
          "Invoice" => "IN",
          "SalesOrder" => "SO"
        }
        clazz_name = "Comee::Core::#{clz}"
        clazz = clazz_name.constantize
        last = clazz.last

        return "#{clz_hash[clz]}1" unless last

        num = last.send(field)[2..].to_i
        "#{clz_hash[clz]}#{num + 1}"
      end
    end
  end
end