## $Id: browser.py 15487 2019-07-05 11:36:40Z henrik $
##
## Copyright (C) 2011 Uli Fouquet & Henrik Bettermann
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##
"""UI components for basic applicants and related components.
"""
import grok
from time import time
from zope.component import getUtility, createObject
from zope.formlib.textwidgets import BytesDisplayWidget
from zope.security import checkPermission
from zope.i18n import translate
from hurry.workflow.interfaces import IWorkflowState
from waeup.kofa.browser.layout import action, UtilityView
from waeup.kofa.interfaces import IExtFileStore, IKofaUtils
from waeup.kofa.applicants.browser import (
    ApplicantRegistrationPage, ApplicantsContainerPage,
    ApplicationFeePaymentAddPage,
    OnlinePaymentApprovePage,
    ExportPDFPageApplicationSlip,
    ApplicantBaseDisplayFormPage)
from waeup.kofa.students.interfaces import IStudentsUtils
from waeup.kofa.applicants.interfaces import (
    ISpecialApplicant, IApplicantsUtils)
from waeup.kofa.browser.interfaces import IPDFCreator
from kofacustom.nigeria.applicants.browser import (
    NigeriaApplicantDisplayFormPage,
    NigeriaApplicantManageFormPage,
    NigeriaApplicantEditFormPage,
    NigeriaPDFApplicationSlip)
from waeup.uniben.applicants.interfaces import (
    ICustomApplicant,
    IUnibenRegistration,
    ICustomUGApplicant,
    ICustomPGApplicant,
    ICustomPGApplicantEdit,
    ICustomUGApplicantEdit,
    IPUTMEApplicantEdit)
from waeup.kofa.applicants.workflow import ADMITTED, PAID, STARTED
from kofacustom.nigeria.applicants.interfaces import (
    UG_OMIT_DISPLAY_FIELDS,
    UG_OMIT_PDF_FIELDS,
    UG_OMIT_MANAGE_FIELDS,
    UG_OMIT_EDIT_FIELDS,
    CBT_OMIT_DISPLAY_FIELDS,
    CBT_OMIT_PDF_FIELDS,
    CBT_OMIT_MANAGE_FIELDS,
    CBT_OMIT_EDIT_FIELDS,
    AFFIL_OMIT_DISPLAY_FIELDS,
    AFFIL_OMIT_PDF_FIELDS,
    AFFIL_OMIT_MANAGE_FIELDS,
    AFFIL_OMIT_EDIT_FIELDS,
    PG_OMIT_DISPLAY_FIELDS,
    PG_OMIT_PDF_FIELDS,
    PG_OMIT_MANAGE_FIELDS,
    PG_OMIT_EDIT_FIELDS,
    PUTME_OMIT_DISPLAY_FIELDS,
    PUTME_OMIT_PDF_FIELDS,
    PUTME_OMIT_MANAGE_FIELDS,
    PUTME_OMIT_EDIT_FIELDS,
    PUTME_OMIT_RESULT_SLIP_FIELDS,
    PUDE_OMIT_DISPLAY_FIELDS,
    PUDE_OMIT_PDF_FIELDS,
    PUDE_OMIT_MANAGE_FIELDS,
    PUDE_OMIT_EDIT_FIELDS,
    PUDE_OMIT_RESULT_SLIP_FIELDS,
    PRE_OMIT_DISPLAY_FIELDS,
    PRE_OMIT_PDF_FIELDS,
    PRE_OMIT_MANAGE_FIELDS,
    PRE_OMIT_EDIT_FIELDS,
    )

from waeup.uniben.interfaces import MessageFactory as _

PASTQ_ALL = ['ADT','CIT','DEF','DEM','EPCS','ESM','HEK','HSE','VTE']

PASTQ_AL = ['ENL','FAA','FOL','HIS','LAL', 'PHL','THR','BUL','JIL',
            'LAW','PPL','PUL'] + PASTQ_ALL

PASTQ_BS = ['ANT','ANY','CHH','COH','HAE','MED','MEH','PHS','SUR',
            'PCG','PCH','PCO', 'PCT','PHA','PHM','PMB','ANA','MBC',
            'MLS','NSC','PSY','DPV','ODR','OSP','PER', 'RES','AEB',
            'BCH','BOT','CED','EVL','MCB','OPT','PBB','SLT','ZOO',
            'AEE','ANS', 'CRS','FIS','FOW','SOS'] + PASTQ_ALL

PASTQ_EPS = ['ARC','CHE','CVE','DMIC','EEE','GEM','MCH','PEE','PRE','CHM',
             'CSC','GLY','MTH','QSV','PHY','CPE','STR'] + PASTQ_ALL

PASTQ_MSS = ['ACC','BNK','BUS','ECO','ESM','GEO','POL','SAA','SWK',
             'ACT','ENT','HRM','INS','MKT'] + PASTQ_ALL

REGISTRATION_OMIT_DISPLAY_FIELDS = (
    'locked',
    'suspended',
    )

REGISTRATION_OMIT_EDIT_FIELDS = (
    'locked',
    'suspended',
    'applicant_id',
    )

REGISTRATION_OMIT_MANAGE_FIELDS = (
    'applicant_id',
    )


REGISTRATION_OMIT_PDF_FIELDS = (
    'locked',
    'suspended',
    )

PUTME_OMIT_PDF_FIELDS = PUTME_OMIT_PDF_FIELDS + (
    'fst_sit_results', 'scd_sit_results')

class CustomApplicantsContainerPage(ApplicantsContainerPage):
    """The standard view for regular applicant containers.
    """

    @property
    def form_fields(self):
        form_fields = super(CustomApplicantsContainerPage, self).form_fields
        usertype = getattr(self.request.principal, 'user_type', None)
        if self.request.principal.id == 'zope.anybody' or  \
            usertype in ('applicant', 'student'):
            return form_fields.omit('application_fee')
        return form_fields

class CustomApplicantRegistrationPage(ApplicantRegistrationPage):
    """Captcha'd registration page for applicants.
    """

    def _redirect(self, email, password, applicant_id):
        # Forward email and credentials to landing page.
        self.redirect(self.url(self.context, 'registration_complete',
            data = dict(email=email, password=password,
            applicant_id=applicant_id)))
        return

class CustomApplicantDisplayFormPage(NigeriaApplicantDisplayFormPage):
    """A display view for applicant data.
    """
    grok.template('applicantdisplaypage')

    @property
    def display_payments(self):
        if self.context.special or self.target == 'ictwk':
            return True
        return getattr(self.context.__parent__, 'application_fee', None)

    def _show_pastq_putme(self):
        return self.target.startswith('pre') \
               and self.context.state in ('paid', 'submitted') \
               and getattr(self.context, 'course1') is not None
        # return False

    @property
    def depcode(self):
        try:
            code = self.context.course1.__parent__.__parent__.code
            return code
        except:
            return

    @property
    def show_pastq_al(self):
        return self._show_pastq_putme() # and self.depcode in PASTQ_AL

    @property
    def show_pastq_bs(self):
        return self._show_pastq_putme() # and self.depcode in PASTQ_BS

    @property
    def show_pastq_eps(self):
        return self._show_pastq_putme() # and self.depcode in PASTQ_EPS

    @property
    def show_pastq_mss(self):
        return self._show_pastq_putme() # and self.depcode in PASTQ_MSS

    @property
    def show_pastq_pude(self):
        return self.target.startswith('pude') \
               and self.context.state in ('paid', 'submitted') 

    @property
    def label(self):
        if self.target == 'ictwk':
            container_title = self.context.__parent__.title
            return _('${a} <br /> Registration Record ${b}', mapping = {
                'a':container_title, 'b':self.context.application_number})
        return super(CustomApplicantDisplayFormPage, self).label

    @property
    def form_fields(self):
        if self.target == 'ictwk':
            form_fields = grok.AutoFields(IUnibenRegistration)
            for field in REGISTRATION_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
            return form_fields
        elif self.target is not None and self.target.startswith('pg'):
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PG_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pre'):
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PRE_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('cbt'): 
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in CBT_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('akj'): 
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PRE_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ak'):
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in AFFIL_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ase'): # was putme
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in PUTME_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pude'):
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in PUDE_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        else:
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in UG_OMIT_DISPLAY_FIELDS:
                form_fields = form_fields.omit(field)
        #form_fields['perm_address'].custom_widget = BytesDisplayWidget
        form_fields['notice'].custom_widget = BytesDisplayWidget
        if not getattr(self.context, 'student_id'):
            form_fields = form_fields.omit('student_id')
        if not getattr(self.context, 'screening_score'):
            form_fields = form_fields.omit('screening_score')
        if not getattr(self.context, 'screening_venue') or self._not_paid():
            form_fields = form_fields.omit('screening_venue')
        if not getattr(self.context, 'screening_date') or self._not_paid():
            form_fields = form_fields.omit('screening_date')
        if not self.context.admchecking_fee_paid():
            form_fields = form_fields.omit(
                'screening_score', 'aggregate', 'student_id')
        return form_fields

    @property
    def display_actions(self):
        state = IWorkflowState(self.context).getState()
        actions = []
        if state == ADMITTED and not self.context.admchecking_fee_paid():
            actions = [_('Add admission checking payment ticket')]
        return actions


    def getCourseAdmitted(self):
        """Return link, title and code in html format to the certificate
           admitted.
        """
        if self.admission_checking_info:
            return '<span class="hint">%s</span>' % self.admission_checking_info
        return super(CustomApplicantDisplayFormPage, self).getCourseAdmitted()

    @property
    def admission_checking_info(self):
        if self.context.state == ADMITTED and \
            not self.context.admchecking_fee_paid():
            return _('You must pay the admission checking fee '
                     'to view your screening results and your course admitted.')
        return

    @action(_('Add admission checking payment ticket'), style='primary')
    def addPaymentTicket(self, **data):
        self.redirect(self.url(self.context, '@@addacp'))
        return

class CustomApplicationFeePaymentAddPage(ApplicationFeePaymentAddPage):
    """ Page to add an online payment ticket
    """

    @property
    def custom_requirements(self):
        store = getUtility(IExtFileStore)
        if not store.getFileByContext(self.context, attr=u'passport.jpg'):
            return _('Upload your 1"x1" Red background passport photo before making payment.')
        return ''

class AdmissionCheckingFeePaymentAddPage(UtilityView, grok.View):
    """ Page to add an admission checking online payment ticket.
    """
    grok.context(ICustomApplicant)
    grok.name('addacp')
    grok.require('waeup.payApplicant')
    factory = u'waeup.ApplicantOnlinePayment'

    def _setPaymentDetails(self, payment):
        container = self.context.__parent__
        timestamp = ("%d" % int(time()*10000))[1:]
        session = str(container.year)
        try:
            session_config = grok.getSite()['configuration'][session]
        except KeyError:
            return _(u'Session configuration object is not available.'), None
        payment.p_id = "p%s" % timestamp
        payment.p_item = container.title
        payment.p_session = container.year
        payment.amount_auth = 0.0
        payment.p_category = 'admission_checking'
        payment.amount_auth = session_config.admchecking_fee
        if payment.amount_auth in (0.0, None):
            return _('Amount could not be determined.'), None
        return

    def update(self):
        if self.context.admchecking_fee_paid():
              self.flash(
                  _('Admission checking payment has already been made.'),
                  type='warning')
              self.redirect(self.url(self.context))
              return
        payment = createObject(self.factory)
        failure = self._setPaymentDetails(payment)
        if failure is not None:
            self.flash(failure[0], type='danger')
            self.redirect(self.url(self.context))
            return
        self.context[payment.p_id] = payment
        self.flash(_('Payment ticket created.'))
        self.redirect(self.url(payment))
        return

    def render(self):
        return


class CustomApplicantManageFormPage(NigeriaApplicantManageFormPage):

    @property
    def display_payments(self):
        if self.context.special or self.target == 'ictwk':
            return True
        return getattr(self.context.__parent__, 'application_fee', None)

    @property
    def custom_upload_requirements(self):
        if not checkPermission('waeup.uploadPassportPictures', self.context):
            return _('You are not entitled to upload passport pictures.')

    @property
    def label(self):
        if self.target == 'ictwk':
            container_title = self.context.__parent__.title
            return _('${a} <br /> Registration Record ${b}', mapping = {
                'a':container_title, 'b':self.context.application_number})
        return super(CustomApplicantManageFormPage, self).label

    @property
    def form_fields(self):
        if self.target == 'ictwk':
            form_fields = grok.AutoFields(IUnibenRegistration)
            for field in REGISTRATION_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
            state = IWorkflowState(self.context).getState()
            if state != STARTED:
                form_fields['registration_cats'].for_display = True
            return form_fields
        if self.target is not None and self.target.startswith('pg'):
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PG_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pre'):
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PRE_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('cbt'): 
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in CBT_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('akj'): 
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PRE_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ak'): 
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in AFFIL_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ase'): # was putme
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in PUTME_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pude'):
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in PUDE_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        else:
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in UG_OMIT_MANAGE_FIELDS:
                form_fields = form_fields.omit(field)
        form_fields['student_id'].for_display = True
        form_fields['applicant_id'].for_display = True
        return form_fields


class CustomApplicantEditFormPage(NigeriaApplicantEditFormPage):
    """An applicant-centered edit view for applicant data.
    """

    def unremovable(self, ticket):
        return True

    @property
    def display_payments(self):
        if self.context.special or self.target == 'ictwk':
            return True
        return getattr(self.context.__parent__, 'application_fee', None)

    @property
    def form_fields(self):
        if self.target == 'ictwk':
            form_fields = grok.AutoFields(IUnibenRegistration)
            for field in REGISTRATION_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
            state = IWorkflowState(self.context).getState()
            if state != STARTED:
                form_fields['registration_cats'].for_display = True
            return form_fields
        if self.target is not None and self.target.startswith('pg'):
            form_fields = grok.AutoFields(ICustomPGApplicantEdit)
            for field in PG_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pre'):
            form_fields = grok.AutoFields(ICustomPGApplicantEdit)
            for field in PRE_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('cbt'):
            form_fields = grok.AutoFields(ICustomUGApplicantEdit)
            for field in CBT_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('akj'):
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PRE_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ak'):
            form_fields = grok.AutoFields(ICustomUGApplicantEdit)
            for field in AFFIL_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ase'): # was putme
            form_fields = grok.AutoFields(IPUTMEApplicantEdit)
            for field in PUTME_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pude'):
            form_fields = grok.AutoFields(ICustomUGApplicantEdit)
            for field in PUDE_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        else:
            form_fields = grok.AutoFields(ICustomUGApplicantEdit)
            for field in UG_OMIT_EDIT_FIELDS:
                form_fields = form_fields.omit(field)
        form_fields['applicant_id'].for_display = True
        form_fields['reg_number'].for_display = True
        return form_fields

    @property
    def label(self):
        if self.target == 'ictwk':
            container_title = self.context.__parent__.title
            return _('${a} <br /> Registration Record ${b}', mapping = {
                'a':container_title, 'b':self.context.application_number})
        return super(CustomApplicantEditFormPage, self).label

class CustomOnlinePaymentApprovePage(OnlinePaymentApprovePage):
    """ Approval view
    """

    def update(self):
        if self.context.p_category == 'admission_checking':
            if self.context.p_state == 'paid':
                flashtype = 'warning'
                msg = _('This ticket has already been paid.')
                log = None
            else:
                self.context.approve()
                log = 'payment approved: %s' % self.context.p_id
                msg = _('Payment approved')
                flashtype = 'success'
        else:
            flashtype, msg, log = self.context.approveApplicantPayment()
        if log is not None:
            applicant = self.context.__parent__
            # Add log message to applicants.log
            applicant.writeLogMessage(self, log)
            # Add log message to payments.log
            self.context.logger.info(
                '%s,%s,%s,%s,%s,,,,,,' % (
                applicant.applicant_id,
                self.context.p_id, self.context.p_category,
                self.context.amount_auth, self.context.r_code))
        self.flash(msg, type=flashtype)
        return

class CustomExportPDFPageApplicationSlip(ExportPDFPageApplicationSlip):
    """Deliver a PDF slip of the context.
    """

    def update(self):
        super(CustomExportPDFPageApplicationSlip, self).update()
        if self.context.state == ADMITTED and \
            not self.context.admchecking_fee_paid():
            self.flash(
                _('Please pay admission checking fee before trying to download '
                  'the application slip.'), type='warning')
            return self.redirect(self.url(self.context))
        return

class CustomPDFApplicationSlip(NigeriaPDFApplicationSlip):

    def _getPDFCreator(self):
        if self.target.startswith('ak'):
            return getUtility(IPDFCreator, name='akoka_pdfcreator')
        return getUtility(IPDFCreator)

    @property
    def form_fields(self):
        if self.target == 'ictwk':
            form_fields = grok.AutoFields(IUnibenRegistration)
            for field in REGISTRATION_OMIT_PDF_FIELDS:
                form_fields = form_fields.omit(field)
            return form_fields
        if self.target is not None and self.target.startswith('pg'):
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PG_OMIT_PDF_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pre'):
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PRE_OMIT_PDF_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('cbt'): # uniben
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in CBT_OMIT_PDF_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('akj'): # uniben
            form_fields = grok.AutoFields(ICustomPGApplicant)
            for field in PRE_OMIT_PDF_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ak'): # uniben
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in AFFIL_OMIT_PDF_FIELDS:
                form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('ase'): # was putme
            form_fields = grok.AutoFields(ICustomUGApplicant)
            if self._reduced_slip():
                for field in PUTME_OMIT_RESULT_SLIP_FIELDS:
                    form_fields = form_fields.omit(field)
            else:
                for field in PUTME_OMIT_PDF_FIELDS:
                    form_fields = form_fields.omit(field)
        elif self.target is not None and self.target.startswith('pude'):
            form_fields = grok.AutoFields(ICustomUGApplicant)
            if self._reduced_slip():
                for field in PUDE_OMIT_RESULT_SLIP_FIELDS:
                    form_fields = form_fields.omit(field)
            else:
                for field in PUDE_OMIT_PDF_FIELDS:
                    form_fields = form_fields.omit(field)
        else:
            form_fields = grok.AutoFields(ICustomUGApplicant)
            for field in UG_OMIT_PDF_FIELDS:
                form_fields = form_fields.omit(field)
        if not getattr(self.context, 'student_id'):
            form_fields = form_fields.omit('student_id')
        if not getattr(self.context, 'screening_score'):
            form_fields = form_fields.omit('screening_score')
        if not getattr(self.context, 'screening_venue'):
            form_fields = form_fields.omit('screening_venue')
        if not getattr(self.context, 'screening_date'):
            form_fields = form_fields.omit('screening_date')
        return form_fields

    @property
    def title(self):
        container_title = self.context.__parent__.title
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        ar_translation = translate(_('Application Record'),
            'waeup.kofa', target_language=portal_language)
        if self.target == 'ictwk':
            return '%s - Registration Record %s' % (container_title,
            self.context.application_number)
        elif self.target.startswith('ab'):
            return 'Federal College of Education (Technical) Asaba - %s %s %s' % (
                container_title, ar_translation,
                self.context.application_number)
        elif self.target.startswith('ak'):
            return 'Federal College of Education (Technical) Akoka - %s - %s %s' % (
                container_title, ar_translation,
                self.context.application_number)
        elif self.target == 'pgn':
            return 'National Institute for Legislative Studies (NILS) - %s %s %s' % (
                container_title, ar_translation,
                self.context.application_number)
        return '%s - %s %s' % (container_title,
            ar_translation, self.context.application_number)

class ExportScreeningInvitationSlip(UtilityView, grok.View):
    """Deliver a PDF slip of the context.
    """
    grok.context(ICustomApplicant)
    grok.name('screening_invitation_slip.pdf')
    grok.require('waeup.viewApplication')
    form_fields = None
    label = u'Invitation Letter for Pre-Admission Screening'


    @property
    def note(self):
        notice = getattr(self.context.__parent__, 'application_slip_notice', None)
        if self.context.screening_date:
            return """
<br /><br /><br /><br /><font size='12'>
Dear %s,
<br /><br /><br />
You are invited for your Uniben Admission Screening Exercise on:
<br /><br />
<strong>%s</strong>.
<br /><br />
Please bring along this letter of invitation to the
<br /><br />
<strong>%s</strong>
<br /><br />
on your screening date.
<br /><br /><br />
Signed,
<br /><br />
The Registrar<br />
<br /><br />
<br /><br />
%s
</font>

""" % (self.context.display_fullname, self.context.screening_date,
       self.context.screening_venue, notice)
        return

    def update(self):
        if not self.context.screening_date:
            self.flash(_('Forbidden'), type="warning")
            self.redirect(self.url(self.context))

    def render(self):
        applicantview = ApplicantBaseDisplayFormPage(self.context, self.request)
        students_utils = getUtility(IStudentsUtils)
        return students_utils.renderPDF(self,'screening_invitation_slip.pdf',
            self.context, applicantview, note=self.note)