require "rexml/document"
class Item
  attr_reader :code, :name, :quantity, :price
  def initialize(code, name, quantity, price)
    @code = code
    @name = name
    @quantity = quantity
    @price = price
  end

  def validate_item(items)
    items.each do |item|
      return false if item.code == self.code
    end
    true
  end
end

class Customer
  def initialize(name, street, city, zip, country)
    @name = name
    @street = street
    @city = city
    @zip =  zip
    @country = country
  end
end

def load_xml(file)
  customers = []
  items_list = []
  File.open(file,"r") do |file|
    doc = REXML::Document.new(file)
    doc.root.elements.each do |order|
      address = order.elements["address[@type='billing']"]
      customers << Customer.new(address.elements["name"].text, address.elements["street"].text, address.elements["city"].text, address.elements["zip"].text, address.elements["country"].text)
      #tady to je druhy zpusob jak pracovat s xml, radeji ukazu oba at to chapes :D
      doc.each_element('//orders//order//items//item') do |items|
        item = Item.new(items.attributes["code"],items.elements["name"].text, items.elements["quantity"].text, items.elements["price"].text)
        items_list << item if item.validate_item(items_list)
      end
    end
  end
  return customers, items_list
end

def print_xml(file)
end


puts "Nacitam XML"
customers, items = load_xml("orders.xml")
puts "Zapisuje XML"
print_xml("output.xml")