## $Id: studylevel.py 8494 2012-05-23 06:36:40Z 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
##
"""
Container which holds the data of a student study level
and contains the course tickets.
"""
import grok
from zope.component.interfaces import IFactory
from zope.interface import implementedBy
from waeup.kofa.students.interfaces import (
    IStudentStudyLevel, IStudentNavigation, ICourseTicket)
from waeup.kofa.utils.helpers import attrs_to_fields
from waeup.kofa.students.vocabularies import StudyLevelSource

class StudentStudyLevel(grok.Container):
    """This is a container for course tickets.
    """
    grok.implements(IStudentStudyLevel, IStudentNavigation)
    grok.provides(IStudentStudyLevel)

    def __init__(self):
        super(StudentStudyLevel, self).__init__()
        self.level = None
        self.validation_date = None
        self.validated_by = None
        return

    def getStudent(self):
        return getattr(getattr(self, '__parent__', None), '__parent__', None)

    @property
    def level_title(self):
        studylevelsource = StudyLevelSource()
        return studylevelsource.factory.getTitle(self.__parent__, self.level)

    def addCourseTicket(self, courseticket):
        """Add a course ticket object.
        """
        if not ICourseTicket.providedBy(courseticket):
            raise TypeError(
                'StudentStudyLeves contain only ICourseTicket instances')
        self[courseticket.code] = courseticket
        return

StudentStudyLevel = attrs_to_fields(StudentStudyLevel)

class StudentStudyLevelFactory(grok.GlobalUtility):
    """A factory for student study levels.
    """
    grok.implements(IFactory)
    grok.name(u'waeup.StudentStudyLevel')
    title = u"Create a new student study level.",
    description = u"This factory instantiates new student study level instances."

    def __call__(self, *args, **kw):
        return StudentStudyLevel()

    def getInterfaces(self):
        return implementedBy(StudentStudyLevel)

class CourseTicket(grok.Model):
    """This is a course ticket which allows the
    student to attend the course. Lecturers will enter scores and more at
    the end of the term.

    A course ticket contains a copy of the original course and
    course referrer data. If the courses and/or their referrers are removed, the
    corresponding tickets remain unchanged. So we do not need any event
    triggered actions on course tickets.
    """
    grok.implements(ICourseTicket, IStudentNavigation)
    grok.provides(ICourseTicket)

    def __init__(self):
        super(CourseTicket, self).__init__()
        self.code = None
        self.title = None
        self.fcode = None
        self.dcode = None
        self.credits = None
        self.passmark = None
        self.semester = None
        return

    def getStudent(self):
        """Get the associated student object.
        """
        # XXX: shouldn't that be an attribute?
        try:
            return self.__parent__.__parent__.__parent__
        except AttributeError:
            return None

    def getLevel(self):
        """Returns the id of the level the ticket has been added to.
        """
        # XXX: shouldn't that be an attribute?
        try:
            return self.__parent__.level
        except AttributeError:
            return None

    def getLevelSession(self):
        """Returns the session of the level the ticket has been added to.
        """
        # XXX: shouldn't that be an attribute?
        try:
            return self.__parent__.level_session
        except AttributeError:
            return None


CourseTicket = attrs_to_fields(CourseTicket)

class CourseTicketFactory(grok.GlobalUtility):
    """A factory for student study levels.
    """
    grok.implements(IFactory)
    grok.name(u'waeup.CourseTicket')
    title = u"Create a new course ticket.",
    description = u"This factory instantiates new course ticket instances."

    def __call__(self, *args, **kw):
        return CourseTicket()

    def getInterfaces(self):
        return implementedBy(CourseTicket)