SelenaSmall/ruby_invoice

# Shop class
class Shop
  attr_reader :order
  # Order input pattern
  PATTERN = /^\s*\d+\s*(watermelons||pineapples||rockmelons)$/

  def initialize(order)
    @order = order
  end

  # Menu method
  # @return nil
  def menu
    $stdout.print "Type BACK at any time to return to the main menu. \nAdd qty and items to backet, example input: 3 watermelons \n"

    loop do
      input = $stdin.gets.chomp

      next if input.empty?

      break if 'BACK'.match?(input)

      choose_items(input)
      next
    end
  end

  # Choose items method
  # @param input [String]
  # @return order_line
  def choose_items(input)
    unless input.match?(PATTERN)
      puts "That's not a valid input"
      return
    end

    line = input.split(/\W+/)

    exec(OrderLine.new(line[0].to_i, Item.new(line[1])))
  end

  private

  # Exec method
  # @param order_line [OrderLine]
  # @return order_line
  def exec(order_line)
    optimal = order_line.optimal(order_line.order_item.name)

    return unless optimal.any?

    order.add_item(order_line,
                   order_line.present_line(optimal))

    order_line
  end
end