## $Id: studylevel.py 14409 2017-01-16 12:48:10Z 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
##
"""
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.utils.helpers import attrs_to_fields
from waeup.kofa.students.studylevel import (
    StudentStudyLevel, CourseTicket,
    CourseTicketFactory, StudentStudyLevelFactory)
from waeup.kofa.students.interfaces import IStudentNavigation
from kofacustom.coewarri.students.interfaces import (
    ICustomStudentStudyLevel, ICustomCourseTicket)

def getGradeWeightFromScore(score):
    if score is None:
        return (None, None)
    if score >= 70:
        return ('A',5)
    if score >= 60:
        return ('B',4)
    if score >= 50:
        return ('C',3)
    if score >= 45:
        return ('D',2)
    if score >= 40:
        return ('E',1)
    return ('F',0)


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

CustomStudentStudyLevel = attrs_to_fields(
    CustomStudentStudyLevel, omit=['total_credits', 'gpa'])

class CustomStudentStudyLevelFactory(StudentStudyLevelFactory):
    """A factory for student study levels.
    """

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

    def getInterfaces(self):
        return implementedBy(CustomStudentStudyLevel)

class CustomCourseTicket(CourseTicket):
    """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(ICustomCourseTicket, IStudentNavigation)
    grok.provides(ICustomCourseTicket)

    @property
    def grade(self):
        """Returns the grade calculated from total score.
        """
        return getGradeWeightFromScore(self.total_score)[0]

    @property
    def weight(self):
        """Returns the weight calculated from total score.
        """
        return getGradeWeightFromScore(self.total_score)[1]

CustomCourseTicket = attrs_to_fields(CustomCourseTicket)

class CustomCourseTicketFactory(CourseTicketFactory):
    """A factory for student study levels.
    """

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

    def getInterfaces(self):
        return implementedBy(CustomCourseTicket)