public class SellingPresentationController {
  private BuyTicketController buyTicketC;
  private SeachPerformanceController searchPerformancesC;
  private AvailabilityOfPerformanceController availabilityOfPerformanceC;

  /**
   * Shows initial input form.
   * view: VSelectShowAndDate
   */
  public Result index(Params params) { }

  /**
   * Searchs performances and shows the results (performances and sessions)
   * view: VPerformanceInformation
   */
  public Result searchPerformance(Params params) { }

  /**
   * Shows form where user introduces the number of tickets he wants.
   * view: VNbEspectarorsInformation
   */
  public Result performanceSelection(Params params) { }

  /**
   * Checks wether the performance has enough seats left or not.
   * If it has enough seats, shows seats map
   * view: VAvailabilityOfSeats
   */
  public Result availabilityOfPerformance(Params params) { }

  /**
   * Checks availability of selected seats and shows payment form.
   * view: VPaymentData
   */
  public Result reserveSeats(Params params) { }

  /**
   * Calculates price and shows confirmation form with the final prize.
   * view: VConfirmPayment
   */
  public Result paymentDataInput(Params params) { }

  /**
   * Cancels payment proccess
   */
  public Result cancel(Params params) { }

  /**
   * Extracts seats information from params.
   * Returns Integer[number_of_seats][2]
   */
  private Integer[][] getSelectedSeats(Params params) { }

  /**
   * Proccess payment and shows ticket information
   * view: VTicketInformation
   */
  public Result confirmPayment(Params params) {
    // The domain controller already has all the information
    // about the payment, we just need to confirm it so
    // it will be stored.
    Ticket ticket = buyTicketC.confirmPayment();

    Result result = new Result('VTicketInformation');
    result.set('ticketID', ticket.getIdentifier());

    return result;
  }
}