## $Id: browser.py 7192 2011-11-25 07:15:50Z 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 os
import sys
import grok

from datetime import datetime, date
from zope.authentication.interfaces import ILogout, IAuthentication
from zope.component import getUtility
from zope.formlib.widget import CustomWidgetFactory
from zope.formlib.form import setUpEditWidgets
from zope.securitypolicy.interfaces import IPrincipalRoleManager
from zope.traversing.browser import absoluteURL

from hurry.workflow.interfaces import IWorkflowInfo, IWorkflowState
from reportlab.pdfgen import canvas
from reportlab.lib.units import cm
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.platypus import (Frame, Paragraph, Image,
    Table, Spacer)
from reportlab.platypus.tables import TableStyle

from waeup.sirp.accesscodes import invalidate_accesscode, get_access_code
from waeup.sirp.accesscodes.workflow import USED
from waeup.sirp.browser import (
    WAeUPPage, WAeUPEditFormPage, WAeUPAddFormPage, WAeUPDisplayFormPage)
from waeup.sirp.browser.breadcrumbs import Breadcrumb
from waeup.sirp.browser.layout import NullValidator
from waeup.sirp.browser.pages import add_local_role, del_local_roles
from waeup.sirp.browser.resources import datepicker, tabs, datatable
from waeup.sirp.browser.viewlets import (
    ManageActionButton, PrimaryNavTab, LeftSidebarLink
    )
from waeup.sirp.interfaces import (
    IWAeUPObject, ILocalRolesAssignable, IExtFileStore, IFileStoreNameChooser)
from waeup.sirp.permissions import get_users_with_local_roles
from waeup.sirp.browser import DEFAULT_PASSPORT_IMAGE_PATH
from waeup.sirp.university.interfaces import ICertificate
from waeup.sirp.utils.helpers import string_from_bytes, file_size
from waeup.sirp.widgets.datewidget import (
    FriendlyDateWidget, FriendlyDateDisplayWidget)
from waeup.sirp.widgets.restwidget import ReSTDisplayWidget
from waeup.sirp.widgets.objectwidget import (
    WAeUPObjectWidget, WAeUPObjectDisplayWidget)
from waeup.sirp.applicants import ResultEntry, Applicant, get_applicant_data
from waeup.sirp.applicants.interfaces import (
    IApplicant, IApplicantPrincipal,IApplicantEdit, IApplicantsRoot,
    IApplicantsContainer, IApplicantsContainerAdd, application_types_vocab,
    MAX_UPLOAD_SIZE,
    )
from waeup.sirp.applicants.workflow import INITIALIZED, STARTED

results_widget = CustomWidgetFactory(
    WAeUPObjectWidget, ResultEntry)

results_display_widget = CustomWidgetFactory(
    WAeUPObjectDisplayWidget, ResultEntry)

class ApplicantsRootPage(WAeUPPage):
    grok.context(IApplicantsRoot)
    grok.name('index')
    grok.require('waeup.Public')
    title = 'Applicants'
    label = 'Application Section'
    pnav = 3

    def update(self):
        super(ApplicantsRootPage, self).update()
        datatable.need()
        return

class ManageApplicantsRootActionButton(ManageActionButton):
    grok.context(IApplicantsRoot)
    grok.view(ApplicantsRootPage)
    grok.require('waeup.manageApplication')
    text = 'Manage application section'

class ApplicantsRootManageFormPage(WAeUPEditFormPage):
    grok.context(IApplicantsRoot)
    grok.name('manage')
    grok.template('applicantsrootmanagepage')
    title = 'Applicants'
    label = 'Manage application section'
    pnav = 3
    grok.require('waeup.manageApplication')
    taboneactions = ['Add applicants container', 'Remove selected','Cancel']
    tabtwoactions1 = ['Remove selected local roles']
    tabtwoactions2 = ['Add local role']
    subunits = 'Applicants Containers'

    def update(self):
        tabs.need()
        datatable.need()
        return super(ApplicantsRootManageFormPage, self).update()

    def getLocalRoles(self):
        roles = ILocalRolesAssignable(self.context)
        return roles()

    def getUsers(self):
        """Get a list of all users.
        """
        for key, val in grok.getSite()['users'].items():
            url = self.url(val)
            yield(dict(url=url, name=key, val=val))

    def getUsersWithLocalRoles(self):
        return get_users_with_local_roles(self.context)

    # ToDo: Show warning message before deletion
    @grok.action('Remove selected')
    def delApplicantsContainers(self, **data):
        form = self.request.form
        child_id = form['val_id']
        if not isinstance(child_id, list):
            child_id = [child_id]
        deleted = []
        for id in child_id:
            try:
                del self.context[id]
                deleted.append(id)
            except:
                self.flash('Could not delete %s: %s: %s' % (
                        id, sys.exc_info()[0], sys.exc_info()[1]))
        if len(deleted):
            self.flash('Successfully removed: %s' % ', '.join(deleted))
        self.redirect(self.url(self.context, '@@manage')+'#tab-1')
        return

    @grok.action('Add applicants container', validator=NullValidator)
    def addApplicantsContainer(self, **data):
        self.redirect(self.url(self.context, '@@add'))
        return

    @grok.action('Cancel', validator=NullValidator)
    def cancel(self, **data):
        self.redirect(self.url(self.context))
        return

    @grok.action('Add local role', validator=NullValidator)
    def addLocalRole(self, **data):
        return add_local_role(self,2, **data)

    @grok.action('Remove selected local roles')
    def delLocalRoles(self, **data):
        return del_local_roles(self,2,**data)

class ApplicantsContainerAddFormPage(WAeUPAddFormPage):
    grok.context(IApplicantsRoot)
    grok.require('waeup.manageApplication')
    grok.name('add')
    grok.template('applicantscontaineraddpage')
    title = 'Applicants'
    label = 'Add applicants container'
    pnav = 3

    form_fields = grok.AutoFields(
        IApplicantsContainerAdd).omit('code').omit('title')
    form_fields['startdate'].custom_widget = FriendlyDateWidget('le')
    form_fields['enddate'].custom_widget = FriendlyDateWidget('le')

    def update(self):
        datepicker.need() # Enable jQuery datepicker in date fields.
        return super(ApplicantsContainerAddFormPage, self).update()

    @grok.action('Add applicants container')
    def addApplicantsContainer(self, **data):
        year = data['year']
        code = u'%s%s' % (data['prefix'], year)
        prefix = application_types_vocab.getTerm(data['prefix'])
        title = u'%s %s/%s' % (prefix.title, year, year + 1)
        if code in self.context.keys():
            self.flash(
                'An applicants container for the same application '
                'type and entrance year exists already in the database.')
            return
        # Add new applicants container...
        provider = data['provider'][1]
        container = provider.factory()
        self.applyData(container, **data)
        container.code = code
        container.title = title
        self.context[code] = container
        self.flash('Added: "%s".' % code)
        self.redirect(self.url(self.context, u'@@manage')+'#tab-1')
        return

    @grok.action('Cancel', validator=NullValidator)
    def cancel(self, **data):
        self.redirect(self.url(self.context, '@@manage') + '#tab-1')

class ApplicantsRootBreadcrumb(Breadcrumb):
    """A breadcrumb for applicantsroot.
    """
    grok.context(IApplicantsRoot)
    title = u'Applicants'

class ApplicantsContainerBreadcrumb(Breadcrumb):
    """A breadcrumb for applicantscontainers.
    """
    grok.context(IApplicantsContainer)

class ApplicantBreadcrumb(Breadcrumb):
    """A breadcrumb for applicants.
    """
    grok.context(IApplicant)

    @property
    def title(self):
        """Get a title for a context.
        """
        return self.context.access_code

class ApplicantsAuthTab(PrimaryNavTab):
    """Applicants tab in primary navigation.
    """
    grok.context(IWAeUPObject)
    grok.order(3)
    grok.require('waeup.viewApplication')
    grok.template('primarynavtab')
    pnav = 3
    tab_title = u'Applicants'

    @property
    def link_target(self):
        return self.view.application_url('applicants')

class ApplicantsAnonTab(ApplicantsAuthTab):
    """Applicants tab in primary navigation.

    Display tab only for anonymous. Authenticated users can call the
    form from the user navigation bar.
    """
    grok.require('waeup.Anonymous')
    tab_title = u'Application'

    # Also zope.manager has role Anonymous.
    # To avoid displaying this tab, uncomment the following.
    #def tab_title(self):
    #    userid = self.request.principal.id
    #    if userid != 'zope.anybody':
    #        tt = u''
    #    else:
    #        tt = u'Application'
    #    return tt

class ApplicantsContainerPage(WAeUPDisplayFormPage):
    """The standard view for regular applicant containers.
    """
    grok.context(IApplicantsContainer)
    grok.name('index')
    grok.require('waeup.Public')
    grok.template('applicantscontainerpage')
    pnav = 3

    form_fields = grok.AutoFields(IApplicantsContainer).omit('title')
    form_fields['startdate'].custom_widget = FriendlyDateDisplayWidget('le')
    form_fields['enddate'].custom_widget = FriendlyDateDisplayWidget('le')
    form_fields['description'].custom_widget = ReSTDisplayWidget

    @property
    def title(self):
        return "Applicants Container: %s" % self.context.title

    @property
    def label(self):
        return self.context.title

class ApplicantsContainerManageActionButton(ManageActionButton):
    grok.order(1)
    grok.context(IApplicantsContainer)
    grok.view(ApplicantsContainerPage)
    grok.require('waeup.manageApplication')
    text = 'Manage applicants container'

class LoginApplicantActionButton(ManageActionButton):
    grok.order(2)
    grok.context(IApplicantsContainer)
    grok.view(ApplicantsContainerPage)
    grok.require('waeup.Anonymous')
    icon = 'login.png'
    text = 'Login for applicants'
    target = 'login'

class ApplicantsContainerManageFormPage(WAeUPEditFormPage):
    grok.context(IApplicantsContainer)
    grok.name('manage')
    grok.template('applicantscontainermanagepage')
    form_fields = grok.AutoFields(IApplicantsContainer).omit('title')
    taboneactions = ['Save','Cancel']
    tabtwoactions = ['Add applicant', 'Remove selected','Cancel']
    tabthreeactions1 = ['Remove selected local roles']
    tabthreeactions2 = ['Add local role']
    # Use friendlier date widget...
    form_fields['startdate'].custom_widget = FriendlyDateWidget('le')
    form_fields['enddate'].custom_widget = FriendlyDateWidget('le')
    grok.require('waeup.manageApplication')

    @property
    def title(self):
        return "Applicants Container: %s" % self.context.title

    @property
    def label(self):
        return 'Manage applicants container'

    pnav = 3

    def update(self):
        datepicker.need() # Enable jQuery datepicker in date fields.
        tabs.need()
        datatable.need()  # Enable jQurey datatables for contents listing
        return super(ApplicantsContainerManageFormPage, self).update()

    def getLocalRoles(self):
        roles = ILocalRolesAssignable(self.context)
        return roles()

    def getUsers(self):
        """Get a list of all users.
        """
        for key, val in grok.getSite()['users'].items():
            url = self.url(val)
            yield(dict(url=url, name=key, val=val))

    def getUsersWithLocalRoles(self):
        return get_users_with_local_roles(self.context)

    @grok.action('Save')
    def apply(self, **data):
        self.applyData(self.context, **data)
        self.flash('Data saved.')
        return

    # ToDo: Show warning message before deletion
    @grok.action('Remove selected')
    def delApplicant(self, **data):
        form = self.request.form
        if form.has_key('val_id'):
            child_id = form['val_id']
        else:
            self.flash('No applicant selected!')
            self.redirect(self.url(self.context, '@@manage')+'#tab-2')
            return
        if not isinstance(child_id, list):
            child_id = [child_id]
        deleted = []
        for id in child_id:
            try:
                del self.context[id]
                deleted.append(id)
            except:
                self.flash('Could not delete %s: %s: %s' % (
                        id, sys.exc_info()[0], sys.exc_info()[1]))
        if len(deleted):
            self.flash('Successfully removed: %s' % ', '.join(deleted))
        self.redirect(self.url(self.context, u'@@manage')+'#tab-2')
        return

    @grok.action('Add applicant', validator=NullValidator)
    def addApplicant(self, **data):
        self.redirect(self.url(self.context, 'addapplicant'))
        return

    @grok.action('Cancel', validator=NullValidator)
    def cancel(self, **data):
        self.redirect(self.url(self.context))
        return

    @grok.action('Add local role', validator=NullValidator)
    def addLocalRole(self, **data):
        return add_local_role(self,3, **data)

    @grok.action('Remove selected local roles')
    def delLocalRoles(self, **data):
        return del_local_roles(self,3,**data)

class LoginApplicant(WAeUPPage):
    grok.context(IApplicantsContainer)
    grok.name('login')
    grok.require('waeup.Public')

    @property
    def title(self):
        return u"Applicant Login: %s" % self.context.title

    @property
    def label(self):
        return u"Login for '%s' applicants only" % self.context.title

    pnav = 3

    @property
    def ac_prefix(self):
        return self.context.ac_prefix

    def update(self, SUBMIT=None):
        self.ac_series = self.request.form.get('form.ac_series', None)
        self.ac_number = self.request.form.get('form.ac_number', None)
        if SUBMIT is None:
            return
        if self.request.principal.id == 'zope.anybody':
            self.flash('Entered credentials are invalid.')
            return
        if not IApplicantPrincipal.providedBy(self.request.principal):
            # Don't care if user is already authenticated as non-applicant
            return

        # From here we handle an applicant (not an officer browsing)
        pin = self.request.principal.access_code

        # If application has not yet started,
        # logout without marking AC as used
        if self.context.startdate > date.today():
            self.flash('Application has not yet started.')
            auth = getUtility(IAuthentication)
            ILogout(auth).logout(self.request)
            self.redirect(self.url(self.context, 'login'))
            return

        # If application has ended and applicant record doesn't exist,
        # logout without marking AC as used
        if not pin in self.context.keys() and (
            self.context.enddate < date.today()):
            self.flash('Application has ended.')
            auth = getUtility(IAuthentication)
            ILogout(auth).logout(self.request)
            self.redirect(self.url(self.context, 'login'))
            return

        # Mark AC as used (this also fires a pin related transition)
        if get_access_code(pin).state != USED:
            comment = u"AC invalidated"
            # Here we know that the ac is in state initialized so we do not
            # expect an exception
            invalidate_accesscode(pin,comment)

        if not pin in self.context.keys():
            # Create applicant record
            applicant = Applicant()
            applicant.access_code = pin
            self.context[pin] = applicant

        role_manager = IPrincipalRoleManager(self.context[pin])
        role_manager.assignRoleToPrincipal(
            'waeup.local.ApplicationOwner', self.request.principal.id)

        # Assign current principal the global Applicant role
        role_manager = IPrincipalRoleManager(grok.getSite())
        role_manager.assignRoleToPrincipal(
            'waeup.Applicant', self.request.principal.id)

        # Mark application as started
        if IWorkflowState(self.context[pin]).getState() is INITIALIZED:
            IWorkflowInfo(self.context[pin]).fireTransition('start')

        self.redirect(self.url(self.context[pin], 'edit'))
        return

class ApplicantAddFormPage(WAeUPAddFormPage):
    """Add-form to add an applicant.
    """
    grok.context(IApplicantsContainer)
    grok.require('waeup.manageApplication')
    grok.name('addapplicant')
    grok.template('applicantaddpage')
    title = 'Applicants'
    label = 'Add applicant'
    pnav = 3

    @property
    def title(self):
        return "Applicants Container: %s" % self.context.title

    @property
    def ac_prefix(self):
        return self.context.ac_prefix

    @grok.action('Create application record')
    def addApplicant(self, **data):
        ac_series = self.request.form.get('form.ac_series', None)
        ac_number = self.request.form.get('form.ac_number', None)
        pin = '%s-%s-%s' % (self.ac_prefix,ac_series,ac_number)
        if not invalidate_accesscode(pin, comment=u"Invalidated by system"):
            self.flash('%s is not a valid access code.' % pin)
            self.redirect(self.url(self.context, '@@manage')+'#tab-2')
            return
        else:
            # Create applicant record
            applicant = Applicant()
            applicant.access_code = pin
            self.context[pin] = applicant
        self.redirect(self.url(self.context[pin], 'edit'))
        return

class AccessCodeViewLink(LeftSidebarLink):
    grok.order(1)
    grok.require('waeup.Public')
    icon = 'actionicon_view.png'
    title = 'View Record'
    target = '/@@index'

    @property
    def url(self):
        if not IApplicantPrincipal.providedBy(self.request.principal):
            return ''
        access_code = getattr(self.request.principal,'access_code',None)
        if access_code:
            applicant_object = get_applicant_data(access_code)
            return absoluteURL(applicant_object, self.request) + self.target
        return ''

class AccessCodeEditLink(AccessCodeViewLink):
    grok.order(2)
    grok.require('waeup.Public')
    icon = 'actionicon_modify.png'
    title = 'Edit Record'
    target = '/@@edit'

    @property
    def url(self):
        if not IApplicantPrincipal.providedBy(self.request.principal):
            return ''
        access_code = getattr(self.request.principal,'access_code',None)
        if access_code:
            applicant_object = get_applicant_data(access_code)
            if applicant_object.locked:
                return ''
            return absoluteURL(applicant_object, self.request) + self.target
        return ''

class AccessCodeSlipLink(AccessCodeViewLink):
    grok.order(3)
    grok.require('waeup.Public')
    icon = 'actionicon_pdf.png'
    title = 'Download Slip'
    target = '/application_slip.pdf'

class DisplayApplicant(WAeUPDisplayFormPage):
    grok.context(IApplicant)
    grok.name('index')
    grok.require('waeup.viewApplication')
    form_fields = grok.AutoFields(IApplicant).omit(
        'locked').omit('course_admitted')
    form_fields['date_of_birth'].custom_widget = FriendlyDateDisplayWidget('le')
    label = 'Applicant'
    grok.template('form_display')
    pnav = 3

    def update(self):
        self.passport_url = self.url(self.context, 'passport.jpg')
        return

    @property
    def title(self):
        if self.request.principal.title == 'Applicant':
            return u'Your Application Record'
        return '%s' % self.context.access_code

    @property
    def label(self):
        container_title = self.context.__parent__.title
        return '%s Application Record' % container_title

    def getCourseAdmitted(self):
        """Return link, title and code in html format to the certificate
           admitted.
        """
        course_admitted = self.context.course_admitted
        if ICertificate.providedBy(course_admitted):
            url = self.url(course_admitted)
            title = course_admitted.title
            code = course_admitted.code
            return '<a href="%s">%s - %s</a>' %(url,code,title)
        return ''

class PDFActionButton(ManageActionButton):
    grok.context(IApplicant)
    grok.require('waeup.viewApplication')
    icon = 'actionicon_pdf.png'
    text = 'Download application slip'
    target = 'application_slip.pdf'

class ExportPDFPage(grok.View):
    """Deliver a PDF slip of the context.
    """
    grok.context(IApplicant)
    grok.name('application_slip.pdf')
    grok.require('waeup.viewApplication')
    form_fields = grok.AutoFields(IApplicant).omit(
        'locked').omit('course_admitted')
    form_fields['date_of_birth'].custom_widget = FriendlyDateDisplayWidget('le')
    prefix = 'form'

    @property
    def label(self):
        container_title = self.context.__parent__.title
        return '%s Application Record' % container_title

    def getCourseAdmitted(self):
        """Return title and code in html format to the certificate
           admitted.
        """
        course_admitted = self.context.course_admitted
        if ICertificate.providedBy(course_admitted):
            title = course_admitted.title
            code = course_admitted.code
            return '%s - %s' %(code,title)
        return ''

    def setUpWidgets(self, ignore_request=False):
        self.adapters = {}
        self.widgets = setUpEditWidgets(
            self.form_fields, self.prefix, self.context, self.request,
            adapters=self.adapters, for_display=True,
            ignore_request=ignore_request
            )

    def render(self):
        SLIP_STYLE = TableStyle(
            [('VALIGN',(0,0),(-1,-1),'TOP')]
            )

        pdf = canvas.Canvas('application_slip.pdf',pagesize=A4)
        pdf.setTitle(self.label)
        pdf.setSubject('Application')
        pdf.setAuthor('%s (%s)' % (self.request.principal.title,
            self.request.principal.id))
        pdf.setCreator('WAeUP SIRP')
        width, height = A4
        style = getSampleStyleSheet()
        pdf.line(1*cm,height-(1.8*cm),width-(1*cm),height-(1.8*cm))

        story = []
        frame_header = Frame(1*cm,1*cm,width-(1.7*cm),height-(1.7*cm))
        header_title = getattr(grok.getSite(), 'name', u'Sample University')
        story.append(Paragraph(header_title, style["Heading1"]))
        frame_header.addFromList(story,pdf)

        story = []
        frame_body = Frame(1*cm,1*cm,width-(2*cm),height-(3.5*cm))
        story.append(Paragraph(self.label, style["Heading2"]))
        story.append(Spacer(1, 18))
        for msg in self.context.history.messages:
            f_msg = '<font face="Courier" size=10>%s</font>' % msg
            story.append(Paragraph(f_msg, style["Normal"]))
        story.append(Spacer(1, 24))


        # insert passport photograph
        img = getUtility(IExtFileStore).getFileByContext(self.context)
        if img is None:
            img = open(DEFAULT_PASSPORT_IMAGE_PATH, 'rb')
        doc_img = Image(img.name, width=4*cm, height=3*cm, kind='bound')
        story.append(doc_img)
        story.append(Spacer(1, 18))

        # render widget fields
        data = []
        self.setUpWidgets()
        for widget in self.widgets:
            f_label = '<font size=12>%s</font>:' % widget.label.strip()
            f_label = Paragraph(f_label, style["Normal"])
            f_text = '<font size=12>%s</font>' % widget()
            f_text = Paragraph(f_text, style["Normal"])
            data.append([f_label,f_text])
        f_label = '<font size=12>Admitted Course of Study:</font>'
        f_text = '<font size=12>%s</font>' % self.getCourseAdmitted()
        f_label = Paragraph(f_label, style["Normal"])
        f_text = Paragraph(f_text, style["Normal"])
        data.append([f_label,f_text])
        table = Table(data,style=SLIP_STYLE)
        story.append(table)
        frame_body.addFromList(story,pdf)

        story = []
        frame_footer = Frame(1*cm,0,width-(2*cm),1*cm)
        timestamp = datetime.now().strftime("%d/%m/%Y %H:%M:%S")
        f_text = '<font size=10>%s</font>' % timestamp
        story.append(Paragraph(f_text, style["Normal"]))
        frame_footer.addFromList(story,pdf)

        self.response.setHeader(
            'Content-Type', 'application/pdf')
        return pdf.getpdfdata()

class ApplicantManageActionButton(ManageActionButton):
    grok.context(IApplicant)
    grok.view(DisplayApplicant)
    grok.require('waeup.manageApplication')
    text = 'Manage application record'
    target = 'edit_full'


def handle_img_upload(upload, context, view):
    """Handle upload of applicant image.

    Returns `True` in case of success or `False`.

    Please note that file pointer passed in (`upload`) most probably
    points to end of file when leaving this function.
    """
    size = file_size(upload)
    if size > MAX_UPLOAD_SIZE:
        view.flash('Uploaded image is too big!')
        return False
    upload.seek(0) # file pointer moved when determining size
    store = getUtility(IExtFileStore)
    file_id = IFileStoreNameChooser(context).chooseName()
    store.createFile(file_id, upload)
    return True

class EditApplicantFull(WAeUPEditFormPage):
    """A full edit view for applicant data.
    """
    grok.context(IApplicant)
    grok.name('edit_full')
    grok.require('waeup.manageApplication')
    form_fields = grok.AutoFields(IApplicant)
    form_fields['date_of_birth'].custom_widget = FriendlyDateWidget('le-year')
    grok.template('form_edit')
    manage_applications = True
    pnav = 3

    def update(self):
        datepicker.need() # Enable jQuery datepicker in date fields.
        super(EditApplicantFull, self).update()
        self.wf_info = IWorkflowInfo(self.context)
        self.max_upload_size = string_from_bytes(MAX_UPLOAD_SIZE)
        self.passport_changed = None
        upload = self.request.form.get('form.passport', None)
        if upload:
            # We got a fresh upload
            self.passport_changed = handle_img_upload(
                upload, self.context, self)
        return

    @property
    def title(self):
        return self.context.access_code

    @property
    def label(self):
        container_title = self.context.__parent__.title
        return '%s Application Form' % container_title

    def getTransitions(self):
        """Return a list of dicts of allowed transition ids and titles.

        Each list entry provides keys ``name`` and ``title`` for
        internal name and (human readable) title of a single
        transition.
        """
        allowed_transitions = self.wf_info.getManualTransitions()
        return [dict(name='', title='No transition')] +[
            dict(name=x, title=y) for x, y in allowed_transitions]

    @grok.action('Save')
    def save(self, **data):
        if self.passport_changed is False:  # False is not None!
            return # error during image upload. Ignore other values
        changed_fields = self.applyData(self.context, **data)
        changed_fields = changed_fields.values()
        fields_string = '+'.join(
            ' + '.join(str(i) for i in b) for b in changed_fields)
        if self.passport_changed:
            fields_string += ' + passport'
        #self.context._p_changed = True
        form = self.request.form
        trans_id = form.get('transition', None)
        if trans_id:
            self.wf_info.fireTransition(trans_id)
        self.flash('Form has been saved.')
        ob_class = self.__implemented__.__name__.replace('waeup.sirp.','')
        if fields_string:
            self.context.loggerInfo(ob_class, 'saved: % s' % fields_string)
        return

class EditApplicantStudent(EditApplicantFull):
    """An applicant-centered edit view for applicant data.
    """
    grok.context(IApplicantEdit)
    grok.name('edit')
    grok.require('waeup.handleApplication')
    form_fields = grok.AutoFields(IApplicantEdit).omit(
        'locked', 'course_admitted', 'student_id',
        'screening_score',
        )
    form_fields['date_of_birth'].custom_widget = FriendlyDateWidget('le-year')
    grok.template('form_edit')
    manage_applications = False
    title = u'Your Application Form'

    def emit_lock_message(self):
        self.flash('The requested form is locked (read-only).')
        self.redirect(self.url(self.context))
        return

    def update(self):
        if self.context.locked:
            self.emit_lock_message()
            return
        datepicker.need() # Enable jQuery datepicker in date fields.
        super(EditApplicantStudent, self).update()
        return

    def dataNotComplete(self):
        if not self.request.form.get('confirm_passport', False):
            return 'Passport confirmation box not ticked.'
        return False

    @grok.action('Save')
    def save(self, **data):
        if self.passport_changed is False:  # False is not None!
            return # error during image upload. Ignore other values
        self.applyData(self.context, **data)
        #self.context._p_changed = True
        self.flash('Form has been saved.')
        return

    @grok.action('Final Submit')
    def finalsubmit(self, **data):
        if self.passport_changed is False:  # False is not None!
            return # error during image upload. Ignore other values
        self.applyData(self.context, **data)
        self.context._p_changed = True
        if self.dataNotComplete():
            self.flash(self.dataNotComplete())
            return
        state = IWorkflowState(self.context).getState()
        # This shouldn't happen, but the application officer
        # might have forgotten to lock the form after changing the state
        if state != STARTED:
            self.flash('This form cannot be submitted. Wrong state!')
            return
        IWorkflowInfo(self.context).fireTransition('submit')
        self.context.application_date = datetime.now()
        self.context.locked = True
        self.flash('Form has been submitted.')
        self.redirect(self.url(self.context))
        return

class ApplicantViewActionButton(ManageActionButton):
    grok.context(IApplicant)
    grok.view(EditApplicantFull)
    grok.require('waeup.manageApplication')
    icon = 'actionicon_view.png'
    text = 'View application record'
    target = 'index'

class PassportImage(grok.View):
    """Renders the passport image for applicants.
    """
    grok.name('passport.jpg')
    grok.context(IApplicant)
    grok.require('waeup.viewApplication')

    def render(self):
        # A filename chooser turns a context into a filename suitable
        # for file storage.
        image = getUtility(IExtFileStore).getFileByContext(self.context)
        self.response.setHeader(
            'Content-Type', 'image/jpeg')
        if image is None:
            # show placeholder image
            return open(DEFAULT_PASSPORT_IMAGE_PATH, 'rb').read()
        return image