def setup_payments(self, sale):
        """ Add the payments defined in the sale to the coupon. Note that this
        function must be called after all the payments has been created.
        """
        # XXX: Remove this when bug #2827 is fixed.
        if not self._item_ids:
            return True

        if self.payments_setup:
            return True

        log.info('Adding payments to the coupon')
        while True:
            try:
                self.emit('add-payments', sale)
                self.payments_setup = True
                return True
            except (DriverError, DeviceError) as details:
                log.info("It is not possible to add payments to the coupon: %s"
                         % str(details))
                if not yesno(_(u"An error occurred while trying to print. "
                               u"Would you like to try again?"),
                             gtk.RESPONSE_YES,
                             _("Try again"), _(u"Don't try again")):
                    CancelPendingPaymentsEvent.emit()
                    return False
                _flush_interface()

    def close(self, sale, store):
        # XXX: Remove this when bug #2827 is fixed.
        if not self._item_ids:
            return True

        if self.coupon_closed:
            return True

        log.info('Closing coupon')
        while True:
            try:
                coupon_id = self.emit('close', sale)
                sale.coupon_id = coupon_id
                self.coupon_closed = True
                return True
            except (DeviceError, DriverError) as details:
                log.info("It is not possible to close the coupon: %s"
                         % str(details))
                if not yesno(_(u"An error occurred while trying to print. "
                               u"Would you like to try again?"),
                             gtk.RESPONSE_YES,
                             _("Try again"), _(u"Don't try again")):
                    CancelPendingPaymentsEvent.emit()
                    return False
                _flush_interface()

    def confirm(self, sale, store, savepoint=None, subtotal=None):
        """Confirms a |sale| on fiscalprinter and database

        If the sale is confirmed, the store will be committed for you.
        There's no need for the callsite to call store.confirm().
        If the sale is not confirmed, for instance the user cancelled the
        sale or there was a problem with the fiscal printer, then the
        store will be rolled back.

        :param sale: the |sale| to be confirmed
        :param trans: a store
        :param savepoint: if specified, a database savepoint name that
            will be used to rollback to if the sale was not confirmed.
        :param subtotal: the total value of all the items in the sale
        """
        # Actually, we are confirming the sale here, so the sale
        # confirmation process will be available to others applications
        # like Till and not only to the POS.
        total_paid = sale.group.get_total_confirmed_value()
        model = run_dialog(ConfirmSaleWizard, self._parent, store, sale,
                           subtotal=subtotal,
                           total_paid=total_paid)

        if not model:
            CancelPendingPaymentsEvent.emit()
            store.rollback(name=savepoint, close=False)
            return False

        if sale.client and not self.is_customer_identified():
            self.identify_customer(sale.client.person)

        if not self.totalize(sale):
            store.rollback(name=savepoint, close=False)
            return False

        if not self.setup_payments(sale):
            store.rollback(name=savepoint, close=False)
            return False

        if not self.close(sale, store):
            store.rollback(name=savepoint, close=False)
            return False

        try:
            sale.confirm()
        except SellError as err:
            warning(str(err))
            store.rollback(name=savepoint, close=False)
            return False

        if not self.print_receipts(sale):
            warning(_("The sale was cancelled"))
            sale.cancel()

        print_cheques_for_payment_group(store, sale.group)

        # Only finish the transaction after everything passed above.
        store.confirm(model)

        return True

    def setup_payments(self, sale):
        """ Add the payments defined in the sale to the coupon. Note that this
        function must be called after all the payments has been created.
        """
        # XXX: Remove this when bug #2827 is fixed.
        if not self._item_ids:
            return True

        if self.payments_setup:
            return True

        log.info('Adding payments to the coupon')
        while True:
            try:
                self.emit('add-payments', sale)
                self.payments_setup = True
                return True
            except (DriverError, DeviceError), details:
                log.info("It is not possible to add payments to the coupon: %s"
                            % str(details))
                if not yesno(_(u"Erro na impressão. Deseja tentar novamente?"),
                         gtk.RESPONSE_YES,
                         _("Sim"), _(u"Não")):
                    CancelPendingPaymentsEvent.emit()
                    return False
                _flush_interface()

    def print_receipts(self, sale):
        #supports_duplicate = self.emit('get-supports-duplicate-receipt')
        # Vamos sempre imprimir sempre de uma vez, para simplificar
        supports_duplicate = False

        log.info('Printing payment receipts')

        # Merge card payments by nsu
        card_payments = {}
        for payment in sale.payments:
            if payment.method.method_name != 'card':
                continue
            operation = payment.method.operation
            card_data = operation.get_card_data_by_payment(payment)
            card_payments.setdefault(card_data.nsu, [])
            card_payments[card_data.nsu].append(payment)

        any_failed = False
        for nsu, payment_list in card_payments.items():
            receipt = CardPaymentReceiptPrepareEvent.emit(nsu, supports_duplicate)
            if receipt is None:
                continue

            value = sum([p.value for p in payment_list])

            # This is BS, but if any receipt failed to print, we must print
            # the remaining ones in Gerencial Rports
            if any_failed:
                retval = self.reprint_payment_receipt(receipt)
            else:
                retval = self.print_payment_receipt(payment_list[0], value, receipt)
            while not retval:
                if not yesno(_(u"Erro na impressão. Deseja tentar novamente?"),
                         gtk.RESPONSE_YES,
                         _("Sim"), _(u"Não")):
                    CancelPendingPaymentsEvent.emit()
                    try:
                        GerencialReportCancelEvent.emit()
                    except (DriverError, DeviceError), details:
                        log.info('Error canceling last receipt: %s' %
                                    details)
                        warning(u'Não foi possível cancelar o último'
                                 ' comprovante')
                    return False
                any_failed = True
                _flush_interface()
                retval = self.reprint_payment_receipt(receipt,
                                                      close_previous=True)

    def totalize(self, sale):
        # XXX: Remove this when bug #2827 is fixed.
        if not self._item_ids:
            return True

        if self.totalized:
            return True

        log.info('Totalizing coupon')
        while True:
            try:
                self.emit('totalize', sale)
                self.totalized = True
                return True
            except (DriverError, DeviceError), details:
                log.info("It is not possible to totalize the coupon: %s"
                            % str(details))
                if not yesno(_(u"Erro na impressão. Deseja tentar novamente?"),
                         gtk.RESPONSE_YES,
                         _("Sim"), _(u"Não")):
                    CancelPendingPaymentsEvent.emit()
                    return False
                _flush_interface()

    def totalize(self, sale):
        # XXX: Remove this when bug #2827 is fixed.
        if not self._item_ids:
            return True

        if self.totalized:
            return True

        log.info('Totalizing coupon')
        while True:
            try:
                self.emit('totalize', sale)
                self.totalized = True
                return True
            except (DriverError, DeviceError) as details:
                log.info("It is not possible to totalize the coupon: %s"
                         % str(details))
                if not yesno(_(u"An error occurred while trying to print. "
                               u"Would you like to try again?"),
                             Gtk.ResponseType.YES,
                             _("Try again"), _(u"Don't try again")):
                    CancelPendingPaymentsEvent.emit()
                    return False
                _flush_interface()

    def confirm(self, sale, store, savepoint=None, subtotal=None):
        """Confirms a |sale| on fiscalprinter and database

        If the sale is confirmed, the store will be committed for you.
        There's no need for the callsite to call store.confirm().
        If the sale is not confirmed, for instance the user cancelled the
        sale or there was a problem with the fiscal printer, then the
        store will be rolled back.

        :param sale: the |sale| to be confirmed
        :param trans: a store
        :param savepoint: if specified, a database savepoint name that
            will be used to rollback to if the sale was not confirmed.
        :param subtotal: the total value of all the items in the sale
        """
        # Actually, we are confirming the sale here, so the sale
        # confirmation process will be available to others applications
        # like Till and not only to the POS.
        total_paid = sale.group.get_total_confirmed_value()
        model = run_dialog(ConfirmSaleWizard, self._parent, store, sale,
                           subtotal=subtotal,
                           total_paid=total_paid)

        if not model:
            CancelPendingPaymentsEvent.emit()
            store.rollback(name=savepoint, close=False)
            return False

        if sale.client and not self.is_customer_identified():
            self.identify_customer(sale.client.person)

        if not self.totalize(sale):
            store.rollback(name=savepoint, close=False)
            return False

        if not self.setup_payments(sale):
            store.rollback(name=savepoint, close=False)
            return False

        if not self.close(sale, store):
            store.rollback(name=savepoint, close=False)
            return False

        try:
            sale.confirm()
        except SellError as err:
            warning(str(err))
            store.rollback(name=savepoint, close=False)
            return False

        if not self.print_receipts(sale):
            warning(_("The sale was cancelled"))
            sale.cancel()

        print_cheques_for_payment_group(store, sale.group)

        # Only finish the transaction after everything passed above.
        store.confirm(model)

        # Try to print only after the transaction is commited, to prevent
        # losing data if something fails while printing
        group = sale.group
        booklets = list(group.get_payments_by_method_name(u'store_credit'))
        bills = list(group.get_payments_by_method_name(u'bill'))

        if (booklets and
            yesno(_("Do you want to print the booklets for this sale?"),
                  gtk.RESPONSE_YES, _("Print booklets"), _("Don't print"))):
            try:
                print_report(BookletReport, booklets)
            except ReportError:
                warning(_("Could not print booklets"))

        if (bills and BillReport.check_printable(bills) and
            yesno(_("Do you want to print the bills for this sale?"),
                  gtk.RESPONSE_YES, _("Print bills"), _("Don't print"))):
            try:
                print_report(BillReport, bills)
            except ReportError:
                # TRANSLATORS: bills here refers to "boletos" in pt_BR
                warning(_("Could not print bills"))

        return True

    def confirm(self, sale, store, savepoint=None, subtotal=None):
        """Confirms a |sale| on fiscalprinter and database

        If the sale is confirmed, the store will be committed for you.
        There's no need for the callsite to call store.confirm().
        If the sale is not confirmed, for instance the user cancelled the
        sale or there was a problem with the fiscal printer, then the
        store will be rolled back.

        :param sale: the |sale| to be confirmed
        :param trans: a store
        :param savepoint: if specified, a database savepoint name that
            will be used to rollback to if the sale was not confirmed.
        :param subtotal: the total value of all the items in the sale
        """
        # Actually, we are confirming the sale here, so the sale
        # confirmation process will be available to others applications
        # like Till and not only to the POS.
        payments_total = sale.group.get_total_confirmed_value()
        sale_total = sale.get_total_sale_amount()

        payment = get_formatted_price(payments_total)
        amount = get_formatted_price(sale_total)
        msg = _(u"Payment value (%s) is greater than sale's total (%s). "
                "Do you want to confirm it anyway?") % (payment, amount)
        if (sale_total < payments_total and not
            yesno(msg, gtk.RESPONSE_NO, _(u"Confirm Sale"), _(u"Don't Confirm"))):
            return False

        model = run_dialog(ConfirmSaleWizard, self._parent, store, sale,
                           subtotal=subtotal, total_paid=payments_total,
                           current_document=self._current_document)

        if not model:
            CancelPendingPaymentsEvent.emit()
            store.rollback(name=savepoint, close=False)
            return False

        if sale.client and not self.is_customer_identified():
            self.identify_customer(sale.client.person)

        try:
            if not self.totalize(sale):
                store.rollback(name=savepoint, close=False)
                return False

            if not self.setup_payments(sale):
                store.rollback(name=savepoint, close=False)
                return False

            if not self.close(sale, store):
                store.rollback(name=savepoint, close=False)
                return False

            if not self.print_receipts(sale):
                store.rollback(name=savepoint, close=False)
                return False

            # FIXME: This used to be done inside sale.confirm. Maybe it would
            # be better to do a proper error handling
            till = Till.get_current(store)
            assert till
            sale.confirm(till=till)

            # Only finish the transaction after everything passed above.
            store.confirm(model)
        except Exception as e:
            warning(_("An error happened while trying to confirm the sale. "
                      "Cancelling the coupon now..."), str(e))
            self.cancel()
            store.rollback(name=savepoint, close=False)
            return False

        print_cheques_for_payment_group(store, sale.group)

        # Try to print only after the transaction is commited, to prevent
        # losing data if something fails while printing
        group = sale.group
        booklets = list(group.get_payments_by_method_name(u'store_credit'))
        bills = list(group.get_payments_by_method_name(u'bill'))

        if (booklets and
            yesno(_("Do you want to print the booklets for this sale?"),
                  gtk.RESPONSE_YES, _("Print booklets"), _("Don't print"))):
            try:
                print_report(BookletReport, booklets)
            except ReportError:
                warning(_("Could not print booklets"))

        if (bills and BillReport.check_printable(bills) and
            yesno(_("Do you want to print the bills for this sale?"),
                  gtk.RESPONSE_YES, _("Print bills"), _("Don't print"))):
            try:
                print_report(BillReport, bills)
            except ReportError:
                # TRANSLATORS: bills here refers to "boletos" in pt_BR
                warning(_("Could not print bills"))

        return True

    def confirm(self, sale, store, savepoint=None,
                subtotal=None,
                total_paid=0):
        """Confirms a |sale| on fiscalprinter and database

        If the sale is confirmed, the store will be committed for you.
        There's no need for the callsite to call store.confirm().
        If the sale is not confirmed, for instance the user cancelled the
        sale or there was a problem with the fiscal printer, then the
        store will be rolled back.

        :param sale: the |sale| to be confirmed
        :param trans: a store
        :param savepoint: if specified, a database savepoint name that
            will be used to rollback to if the sale was not confirmed.
        :param subtotal: the total value of all the items in the sale
        :param total_paid: what has already been paid on this sale,
            used when returning an item
        """
        # Actually, we are confirming the sale here, so the sale
        # confirmation process will be available to others applications
        # like Till and not only to the POS.
        model = run_dialog(ConfirmSaleWizard, self._parent, store, sale,
                           subtotal=subtotal,
                           total_paid=total_paid)

        missing = sale.get_missing_items()
        if missing:
            run_dialog(ConfirmSaleMissingDialog, self._parent, sale, missing)
            store.rollback(name=savepoint, close=False)
            return False

        if not model:
            CancelPendingPaymentsEvent.emit()
            store.rollback(name=savepoint, close=False)
            return False

        if sale.client and not self.is_customer_identified():
            self.identify_customer(sale.client.person)

        if not self.totalize(sale):
            store.rollback(name=savepoint, close=False)
            return False

        if not self.setup_payments(sale):
            store.rollback(name=savepoint, close=False)
            return False

        if not self.close(sale, store):
            store.rollback(name=savepoint, close=False)
            return False

        sale.confirm()

        if not self.print_receipts(sale):
            warning('A venda foi cancelada')
            sale.cancel()

        if sale.only_paid_with_money():
            sale.set_paid()
        else:
            sale.group.pay_money_payments()

        print_cheques_for_payment_group(store, sale.group)

        # Only finish the transaction after everything passed above.
        store.confirm(model)

        return True