## $Id: browser.py 14000 2016-06-30 09:23:19Z henrik $
##
## Copyright (C) 2012 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
##
import grok
import csv
import textwrap
from cStringIO import StringIO
from zope.i18n import translate
from zope.component import getUtility, queryUtility
from zope.security import checkPermission
from zope.catalog.interfaces import ICatalog
from zope.formlib.textwidgets import BytesDisplayWidget
from waeup.kofa.browser.layout import UtilityView
from waeup.kofa.widgets.datewidget import FriendlyDatetimeDisplayWidget
from waeup.kofa.interfaces import IKofaUtils, academic_sessions_vocab
from waeup.kofa.students.interfaces import IStudentsUtils, IStudent
from waeup.kofa.students.workflow import PAID, REGISTERED, RETURNING
from waeup.kofa.students.studylevel import getGradeWeightFromScore
from waeup.kofa.students.browser import (
    StartClearancePage,
    StudentBasePDFFormPage,
    CourseTicketAddFormPage,
    StudyLevelDisplayFormPage,
    StudyLevelManageFormPage,
    StudyLevelEditFormPage,
    ExportPDFTranscriptSlip,
    ExportPDFAdmissionSlip,
    BedTicketAddPage,
    StudentFilesUploadPage,
    PaymentsManageFormPage,
    CourseTicketDisplayFormPage,
    CourseTicketManageFormPage,
    EditScoresPage,
    ExportPDFScoresSlip
    )
from kofacustom.nigeria.students.browser import (
    NigeriaOnlinePaymentDisplayFormPage,
    NigeriaOnlinePaymentAddFormPage,
    NigeriaExportPDFPaymentSlip,
    NigeriaExportPDFCourseRegistrationSlip,
    NigeriaExportPDFClearanceSlip,
    NigeriaStudentPersonalDisplayFormPage,
    NigeriaStudentPersonalEditFormPage,
    NigeriaStudentPersonalManageFormPage,
    NigeriaStudentClearanceEditFormPage,
    NigeriaAccommodationManageFormPage,
    NigeriaStudentBaseDisplayFormPage,
    NigeriaStudentBaseManageFormPage
    )
from waeup.aaue.students.interfaces import (
    ICustomStudentOnlinePayment,
    ICustomStudentStudyLevel,
    ICustomStudent,
    ICustomStudentPersonal,
    ICustomStudentPersonalEdit,
    ICustomUGStudentClearance,
    ICustomCourseTicket,
    ICustomStudentBase)
from waeup.aaue.interswitch.browser import gateway_net_amt
from waeup.aaue.interfaces import MessageFactory as _

class CustomStudentBaseDisplayFormPage(NigeriaStudentBaseDisplayFormPage):
    """ Page to display student base data
    """
    form_fields = grok.AutoFields(ICustomStudentBase).omit(
        'password', 'suspended', 'suspended_comment', 'flash_notice')
    form_fields[
        'financial_clearance_date'].custom_widget = FriendlyDatetimeDisplayWidget('le')

class CustomStudentBaseManageFormPage(NigeriaStudentBaseManageFormPage):
    """ View to manage student base data
    """
    form_fields = grok.AutoFields(ICustomStudentBase).omit(
        'student_id', 'adm_code', 'suspended',
        'financially_cleared_by', 'financial_clearance_date')

class CustomStudentPersonalDisplayFormPage(NigeriaStudentPersonalDisplayFormPage):
    """ Page to display student personal data
    """
    form_fields = grok.AutoFields(ICustomStudentPersonal)
    form_fields['perm_address'].custom_widget = BytesDisplayWidget
    form_fields['father_address'].custom_widget = BytesDisplayWidget
    form_fields['mother_address'].custom_widget = BytesDisplayWidget
    form_fields['next_kin_address'].custom_widget = BytesDisplayWidget
    form_fields[
        'personal_updated'].custom_widget = FriendlyDatetimeDisplayWidget('le')

class CustomStudentPersonalEditFormPage(NigeriaStudentPersonalEditFormPage):
    """ Page to edit personal data
    """
    form_fields = grok.AutoFields(ICustomStudentPersonalEdit).omit('personal_updated')

class CustomStudentPersonalManageFormPage(NigeriaStudentPersonalManageFormPage):
    """ Page to edit personal data
    """
    form_fields = grok.AutoFields(ICustomStudentPersonal)
    form_fields['personal_updated'].for_display = True
    form_fields[
        'personal_updated'].custom_widget = FriendlyDatetimeDisplayWidget('le')

class CustomStudentClearanceEditFormPage(NigeriaStudentClearanceEditFormPage):
    """ View to edit student clearance data by student
    """

    @property
    def form_fields(self):
        if self.context.is_postgrad:
            form_fields = grok.AutoFields(ICustomPGStudentClearance).omit(
            'clearance_locked', 'nysc_location', 'clr_code', 'officer_comment',
            'physical_clearance_date')
        else:
            form_fields = grok.AutoFields(ICustomUGStudentClearance).omit(
            'clearance_locked', 'clr_code', 'officer_comment',
            'physical_clearance_date')
        return form_fields

class CustomStartClearancePage(StartClearancePage):
    with_ac = False

    @property
    def all_required_fields_filled(self):
        if not self.context.email:
            return _("Email address is missing."), 'edit_base'
        if not self.context.phone:
            return _("Phone number is missing."), 'edit_base'
        if not self.context.father_name:
            return _("Personal data form is not properly filled."), 'edit_personal'
        return

class CustomOnlinePaymentDisplayFormPage(NigeriaOnlinePaymentDisplayFormPage):
    """ Page to view an online payment ticket
    """
    grok.context(ICustomStudentOnlinePayment)
    form_fields = grok.AutoFields(ICustomStudentOnlinePayment).omit(
        'provider_amt', 'gateway_amt', 'thirdparty_amt', 'p_item')
    form_fields[
        'creation_date'].custom_widget = FriendlyDatetimeDisplayWidget('le')
    form_fields[
        'payment_date'].custom_widget = FriendlyDatetimeDisplayWidget('le')

class CustomOnlinePaymentAddFormPage(NigeriaOnlinePaymentAddFormPage):
    """ Page to add an online payment ticket
    """
    form_fields = grok.AutoFields(ICustomStudentOnlinePayment).select(
        'p_category')

class CustomPaymentsManageFormPage(PaymentsManageFormPage):
    """ Page to manage the student payments.

    This manage form page is for both students and students officers.
    """
    @property
    def manage_payments_allowed(self):
        return checkPermission('waeup.manageStudent', self.context)

class CustomExportPDFPaymentSlip(NigeriaExportPDFPaymentSlip):
    """Deliver a PDF slip of the context.
    """
    grok.context(ICustomStudentOnlinePayment)
    form_fields = grok.AutoFields(ICustomStudentOnlinePayment).omit(
        'provider_amt', 'gateway_amt', 'thirdparty_amt', 'p_item')
    form_fields['creation_date'].custom_widget = FriendlyDatetimeDisplayWidget('le')
    form_fields['payment_date'].custom_widget = FriendlyDatetimeDisplayWidget('le')

    @property
    def note(self):
        p_session = self.context.p_session
        try:
            academic_session = grok.getSite()['configuration'][str(p_session)]
        except KeyError:
            academic_session = None
        text =  '\n\n The Amount Authorized is inclusive of: '
        if self.context.p_category in ('schoolfee_incl', 'schoolfee_1') \
            and academic_session:
            welfare_fee = gateway_net_amt(academic_session.welfare_fee)
            union_fee = gateway_net_amt(academic_session.union_fee)
            text += ('School Fee, '
                     '%s Naira Student Union Dues, '
                     '%s Naira Student Welfare Assurance Fee and '
                     % (union_fee, welfare_fee))
        elif self.context.p_category in (
            'clearance_incl', 'clearance_medical_incl') and academic_session:
            matric_gown_fee = gateway_net_amt(academic_session.matric_gown_fee)
            lapel_fee = gateway_net_amt(academic_session.lapel_fee)
            text += ('Acceptance Fee, '
                     '%s Naira Matriculation Gown Fee, '
                     '%s Naira Lapel/File Fee and '
                     % (matric_gown_fee, lapel_fee))
        return text + '250.0 Naira Transaction Charge.'

class CustomStudyLevelDisplayFormPage(StudyLevelDisplayFormPage):
    """ Page to display student study levels
    """
    grok.context(ICustomStudentStudyLevel)
    form_fields = grok.AutoFields(ICustomStudentStudyLevel).omit(
        'total_credits', 'gpa', 'level')
    form_fields[
        'validation_date'].custom_widget = FriendlyDatetimeDisplayWidget('le')

    @property
    def show_results(self):
        isStudent = getattr(
            self.request.principal, 'user_type', None) == 'student'
        if isStudent and self.context.student.state != RETURNING \
            and self.context.student.current_level == self.context.level:
            return False
        return True

class CustomStudyLevelManageFormPage(StudyLevelManageFormPage):
    """ Page to edit the student study level data
    """
    grok.context(ICustomStudentStudyLevel)

class CustomStudyLevelEditFormPage(StudyLevelEditFormPage):
    """ Page to edit the student study level data by students
    """
    grok.context(ICustomStudentStudyLevel)

class CustomExportPDFCourseRegistrationSlip(
    NigeriaExportPDFCourseRegistrationSlip):
    """Deliver a PDF slip of the context.
    """
    grok.context(ICustomStudentStudyLevel)
    form_fields = grok.AutoFields(ICustomStudentStudyLevel).omit(
        'level_session', 'level_verdict',
        'validated_by', 'validation_date', 'gpa', 'level')

    omit_fields = ('password', 'suspended', 'suspended_comment',
        'phone', 'adm_code', 'sex', 'email', 'date_of_birth',
        'department', 'current_mode', 'current_level', 'flash_notice')

    @property
    def show_results(self):
        isStudent = getattr(
            self.request.principal, 'user_type', None) == 'student'
        return not isStudent \
            or self.context.student.current_level != self.context.level \
            or self.context.student.state == RETURNING

    def update(self):
        if self.context.student.state != REGISTERED \
            and self.context.student.current_level == self.context.level:
            self.flash(_('Forbidden'), type="warning")
            self.redirect(self.url(self.context))
            return

    @property
    def label(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        lang = self.request.cookies.get('kofa.language', portal_language)
        level_title = translate(self.context.level_title, 'waeup.kofa',
            target_language=lang)
        line0 = ''
        if self.context.student.is_postgrad:
            line0 = 'SCHOOL OF POSTGRADUATE STUDIES\n'
        elif self.context.student.current_mode.endswith('_pt'):
            line0 = 'DIRECTORATE OF PART-TIME DEGREE PROGRAMMES\n'
        line1 = translate(_('Course Registration Slip'),
            target_language=portal_language) \
            + ' %s' % level_title
        line2 = translate(_('Session'),
            target_language=portal_language) \
            + ' %s' % self.context.getSessionString
        return '%s%s\n%s' % (line0, line1, line2)

    @property
    def title(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        return translate(_('Units Registered'), target_language=portal_language)

    def _signatures(self):
        if self.context.student.current_mode.endswith('_pt') \
            or self.context.student.current_mode == 'found':
            return (
                [('I have selected the course on the advise of my Head of '
                 'Department. <br>', _('Student\'s Signature'), '<br>')],
                [('This student has satisfied the department\'s requirements. '
                 'I recommend to approve the course registration. <br>',
                 _('Head of Department\'s Signature'), '<br>')],
                [('' , _('Deputy Registrar\'s Signature'), '<br>')],
                [('', _('Director\'s Signature'))]
                )
        if self.context.student.current_mode in (
            'de_ft', 'ug_ft', 'dp_ft', 'transfer'):
            return ([_('Academic Adviser\'s Signature'),
                _('Faculty Officer\'s Signature'),
                _('Student\'s Signature')],)

        if self.context.student.current_mode in ('special_pg_ft', 'special_pg_pt'):
            return (
                [('I declare that all items of information supplied above are correct:' ,
                    _('Student\'s Signature'), '<br>')],
                [('We approved the above registration:',
                    _('Major Supervisor (Name / Signature)'), '')],
                [('', _('Co-Supervisor (Name / Signature)'), '')],
                [('', _('Head of Department'), '<br>')],
                [('The student has satisfied the conditions for renewal of '
                  'registration for graduate school programme in this university:',
                  _('Secretary <br /> (School of Postgraduate Studies)'), '')],
                [('', _('Dean <br /> (School of Postgraduate Studies)'), '')],
                )
        return None


    def render(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        Sem = translate(_('Sem.'), target_language=portal_language)
        Code = translate(_('Code'), target_language=portal_language)
        Title = translate(_('Title'), target_language=portal_language)
        Cred = translate(_('Cred.'), target_language=portal_language)
        if self.show_results:
            Score = translate(_('Score'), target_language=portal_language)
            #CA = translate(_('CA'), target_language=portal_language)
            Grade = translate(_('Grade'), target_language=portal_language)
        Signature = translate(_('Lecturer\'s Signature'), 'waeup.aaue',
            target_language=portal_language)
        studentview = StudentBasePDFFormPage(self.context.student,
            self.request, self.omit_fields)
        students_utils = getUtility(IStudentsUtils)

        tabledata = []
        tableheader = []
        contenttitle = []
        for i in range(1,7):
            tabledata.append(sorted(
                [value for value in self.context.values() if value.semester == i],
                key=lambda value: str(value.semester) + value.code))
            if self.show_results:
                tableheader.append([(Code,'code', 2.0),
                                   (Title,'title', 7),
                                   (Cred, 'credits', 1.5),
                                   (Score, 'score', 1.4),
                                   #(CA, 'ca', 1.4),
                                   (Grade, 'grade', 1.4),
                                   (Signature, 'dummy', 3),
                                   ])
            else:
                tableheader.append([(Code,'code', 2.0),
                                   (Title,'title', 7),
                                   (Cred, 'credits', 1.5),
                                   (Signature, 'dummy', 3),
                                   ])
        if len(self.label.split('\n')) == 3:
            topMargin = 1.9
        elif len(self.label.split('\n')) == 2:
            topMargin = 1.7
        else:
            topMargin = 1.5
        return students_utils.renderPDF(
            self, 'course_registration_slip.pdf',
            self.context.student, studentview,
            tableheader=tableheader,
            tabledata=tabledata,
            signatures=self._signatures(),
            topMargin=topMargin,
            omit_fields=self.omit_fields
            )

class CustomExportPDFTranscriptSlip(ExportPDFTranscriptSlip):
    """Deliver a PDF slip of the context.
    """

    def _sigsInFooter(self):
        return []

    def _signatures(self):
        return ([(
            'Akhimien Felicia O. (MANUPA) <br /> Principal Assistant Registrar  <br /> '
            'Exams, Records and Data Processing Division <br /> For: Registrar')],)

    def render(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        Term = translate(_('Sem.'), target_language=portal_language)
        Code = translate(_('Code'), target_language=portal_language)
        Title = translate(_('Title'), target_language=portal_language)
        Cred = translate(_('Credits'), target_language=portal_language)
        Score = translate(_('Score'), target_language=portal_language)
        #CA = translate(_('CA'), target_language=portal_language)
        Grade = translate(_('Grade'), target_language=portal_language)
        studentview = StudentBasePDFFormPage(self.context.student,
            self.request, self.omit_fields)
        students_utils = getUtility(IStudentsUtils)

        tableheader = [(Code,'code', 2.5),
                         (Title,'title', 7),
                         (Term, 'semester', 1.5),
                         (Cred, 'credits', 1.5),
                         (Score, 'score', 1.5),
                         #(CA, 'ca', 1.5),
                         (Grade, 'grade', 1.5),
                         ]

        return students_utils.renderPDFTranscript(
            self, 'transcript.pdf',
            self.context.student, studentview,
            omit_fields=self.omit_fields,
            tableheader=tableheader,
            signatures=self._signatures(),
            sigs_in_footer=self._sigsInFooter(),
            )

class CustomExportPDFAdmissionSlip(ExportPDFAdmissionSlip):
    """Deliver a PDF Admission slip.
    """

    @property
    def label(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        return translate(_('e-Admission Slip \n'),
            target_language=portal_language) \
            + ' %s' % self.context.display_fullname

class CustomExportPDFClearanceSlip(NigeriaExportPDFClearanceSlip):
    """Deliver a PDF slip of the context.
    """

    @property
    def label(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        return translate(_('Clearance Slip\n'),
            target_language=portal_language) \
            + ' %s' % self.context.display_fullname

class StudentGetMatricNumberPage(UtilityView, grok.View):
    """ Construct and set the matriculation number.
    """
    grok.context(IStudent)
    grok.name('get_matric_number')
    grok.require('waeup.viewStudent')

    def update(self):
        students_utils = getUtility(IStudentsUtils)
        msg, mnumber = students_utils.setMatricNumber(self.context)
        if msg:
            self.flash(msg, type="danger")
        else:
            self.flash(_('Matriculation number %s assigned.' % mnumber))
            self.context.writeLogMessage(self, '%s assigned' % mnumber)
        self.redirect(self.url(self.context))
        return

    def render(self):
        return

class ExportPDFMatricNumberSlip(UtilityView, grok.View):
    """Deliver a PDF notification slip.
    """
    grok.context(ICustomStudent)
    grok.name('matric_number_slip.pdf')
    grok.require('waeup.viewStudent')
    prefix = 'form'

    form_fields = grok.AutoFields(ICustomStudent).select(
        'student_id', 'matric_number')
    omit_fields = ('date_of_birth', 'current_level', 'flash_notice')

    @property
    def title(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        return translate(_('Matriculation Number'), 'waeup.kofa',
            target_language=portal_language)

    @property
    def label(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        return translate(_('Matriculation Number Slip\n'),
            target_language=portal_language) \
            + ' %s' % self.context.display_fullname

    def render(self):
        if self.context.state not in (PAID,) or not self.context.is_fresh \
            or not self.context.matric_number:
            self.flash('Not allowed.', type="danger")
            self.redirect(self.url(self.context))
            return
        students_utils = getUtility(IStudentsUtils)
        pre_text = _('Congratulations! Your acceptance fee and school fees ' +
                     'payments have been received and your matriculation ' +
                     'number generated with details as follows.')
        return students_utils.renderPDFAdmissionLetter(self,
            self.context.student, omit_fields=self.omit_fields,
            pre_text=pre_text, post_text='')

class ExportPersonalDataSlip(UtilityView, grok.View):
    """Deliver a PDF notification slip.
    """
    grok.context(ICustomStudent)
    grok.name('personal_data_slip.pdf')
    grok.require('waeup.viewStudent')
    prefix = 'form'
    note = None

    form_fields = grok.AutoFields(ICustomStudentPersonal).omit('personal_updated')
    omit_fields = ('suspended', 'suspended_comment', 'adm_code',
                   'certificate', 'flash_notice')

    @property
    def title(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        return translate(_('Personal Data'), 'waeup.kofa',
            target_language=portal_language)

    @property
    def label(self):
        portal_language = getUtility(IKofaUtils).PORTAL_LANGUAGE
        return translate(_('Personal Data Slip\n'),
            target_language=portal_language) \
            + ' %s' % self.context.display_fullname

    def render(self):
        studentview = StudentBasePDFFormPage(self.context.student,
            self.request, self.omit_fields)
        students_utils = getUtility(IStudentsUtils)
        return students_utils.renderPDF(self, 'personal_data_slip.pdf',
            self.context.student, studentview, note=self.note,
            omit_fields=self.omit_fields)

class CustomAccommodationManageFormPage(NigeriaAccommodationManageFormPage):
    """ Page to manage bed tickets.
    This manage form page is for both students and students officers.
    """
    with_hostel_selection = True

class CustomBedTicketAddPage(BedTicketAddPage):
    with_ac = False

class CustomStudentFilesUploadPage(StudentFilesUploadPage):
    """ View to upload files by student. Inherit from same class in
    base package, not from kofacustom.nigeria which
    requires that no application slip exists.
    """

class CustomCourseTicketDisplayFormPage(CourseTicketDisplayFormPage):
    """ Page to display course tickets
    """
    form_fields = grok.AutoFields(ICustomCourseTicket)

class CustomCourseTicketManageFormPage(CourseTicketManageFormPage):
    """ Page to manage course tickets
    """
    form_fields = grok.AutoFields(ICustomCourseTicket)
    form_fields['title'].for_display = True
    form_fields['fcode'].for_display = True
    form_fields['dcode'].for_display = True
    form_fields['semester'].for_display = True
    form_fields['passmark'].for_display = True
    form_fields['credits'].for_display = True
    form_fields['mandatory'].for_display = False
    form_fields['automatic'].for_display = True
    form_fields['carry_over'].for_display = True

class CustomEditScoresPage(EditScoresPage):
    """Page that filters and lists students.
    """
    grok.template('editscorespage')


    def _extract_uploadfile(self, uploadfile):
        """Get a mapping of student-ids to scores.

        The mapping is constructed by reading contents from `uploadfile`.

        We expect uploadfile to be a regular CSV file with columns
        ``student_id``, ``score`` and ``ca`` (other cols are ignored).
        """
        result = dict()
        data = StringIO(uploadfile.read())  # ensure we have something seekable
        reader = csv.DictReader(data)
        for row in reader:
            if not ('student_id' in row and 'score' in row and 'ca' in row):
                continue
            result[row['student_id']] = (row['score'], row['ca'])
        return result

    def update(self,  *args, **kw):
        form = self.request.form
        ob_class = self.__implemented__.__name__.replace('waeup.kofa.', '')
        self.current_academic_session = grok.getSite()[
            'configuration'].current_academic_session
        if self.context.__parent__.__parent__.score_editing_disabled:
            self.flash(_('Score editing disabled.'), type="warning")
            self.redirect(self.url(self.context))
            return
        if not self.current_academic_session:
            self.flash(_('Current academic session not set.'), type="warning")
            self.redirect(self.url(self.context))
            return
        self.session_title = academic_sessions_vocab.getTerm(
            self.current_academic_session).title
        self.tickets = self._searchCatalog(self.current_academic_session)
        editable_tickets = [
            ticket for ticket in self.tickets if ticket.editable_by_lecturer]
        if not self.tickets:
            self.flash(_('No student found.'), type="warning")
            self.redirect(self.url(self.context))
            return
        if not 'UPDATE_TABLE' in form and not 'UPDATE_FILE' in form:
            return

        if not editable_tickets:
            return
        if 'UPDATE_FILE' in form:
            if form['uploadfile']:
                try:
                    formvals = self._extract_uploadfile(form['uploadfile'])
                except:
                    self.flash(
                        _('Uploaded file contains illegal data. Ignored'),
                        type="danger")
                    return
            else:
                self.flash(
                    _('No file provided.'), type="danger")
                return
        else:
            formvals = dict(zip(form['sids'], zip(form['scores'], form['cas'])))
        error = ''
        for ticket in editable_tickets:
            ticket_error = False
            score = ticket.score
            ca = ticket.ca
            sid = ticket.student.student_id
            if formvals[sid][0] == '':
                score = None
            if formvals[sid][1] == '':
                ca = None
            try:
                if formvals[sid][0]:
                    score = int(formvals[sid][0])
                if formvals[sid][1]:
                    ca = int(formvals[sid][1])
            except ValueError:
                error += '%s, ' % ticket.student.display_fullname
                ticket_error = True
            if not ticket_error and ticket.score != score:
                ticket.score = score
                ticket.student.__parent__.logger.info(
                    '%s - %s %s/%s score updated (%s)' %
                    (ob_class, ticket.student.student_id,
                     ticket.level, ticket.code, score))
            if not ticket_error and ticket.ca != ca:
                ticket.ca = ca
                ticket.student.__parent__.logger.info(
                    '%s - %s %s/%s ca updated (%s)' %
                    (ob_class, ticket.student.student_id,
                     ticket.level, ticket.code, ca))
        if error:
            self.flash(_('Error: Score(s) and CA(s) of %s have not be updated. '
              'Only integers are allowed.' % error.strip(', ')),
              type="danger")
            return
        self.flash(_('You successfully updated course results.'))
        return

class CustomExportPDFScoresSlip(ExportPDFScoresSlip):
    """Deliver a PDF slip of course tickets for a lecturer.
    """

    def table_data(self, session):
        cat = queryUtility(ICatalog, name='coursetickets_catalog')
        coursetickets = cat.searchResults(
            session=(session, session),
            code=(self.context.code, self.context.code)
            )
        header = [[_(''),
                   _('Matric No.'),
                   _('Reg. No.'),
                   _('Fullname'),
                   _('Status'),
                   _('Course of\nStudies'),
                   _('Level'),
                   _('Exam\nScore'),
                   _(' CA  '),
                   _('Total '),
                   _('Grade'),
                   ],]
        tickets = []
        no = 1
        for ticket in list(coursetickets):
            if None in (ticket.score, ticket.ca):
                total = 'n/a'
                grade = 'n/a'
            else:
                total = ticket.score + ticket.ca
                grade = getGradeWeightFromScore(total)[0]
            fullname = textwrap.fill(ticket.student.display_fullname, 30)
            row = [no,
                  ticket.student.matric_number,
                  ticket.student.reg_number,
                  fullname,
                  ticket.student.translated_state,
                  ticket.student.certcode,
                  ticket.level,
                  ticket.ca,
                  ticket.score,
                  total,
                  grade,
                  ]
            tickets.append(row)
            no += 1
        return header + sorted(tickets,
            key=lambda value: value[5] + str(value[6]) + value[3])