## $Id: schoolgrades.py 12570 2015-02-09 08:06:11Z 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
##
"""Components representing and aggregating school grades.
"""
import grok
from zc.sourcefactory.basic import BasicSourceFactory
from zope.interface import Interface
from zope.formlib.interfaces import IInputWidget, IDisplayWidget
from zope.publisher.interfaces.browser import IBrowserRequest
from zope import schema
from zope.schema.interfaces import IObject
from zope.schema.fieldproperty import FieldProperty
from waeup.ikoba.widgets.objectwidget import (
    IkobaObjectWidget, IkobaObjectDisplayWidget
    )
from ikobacustom.pcn.interfaces import MessageFactory as _

EXAM_SUBJECTS_DICT = {
    'accounts': 'Accounts',
    'add_general_science': 'Add General Science',
    'add_maths': 'Add Maths',
    'adv_elect_install_maint': 'Adv. Electrical Installation and Maintenance',
    'agricultural_science': 'Agricultural Science',
    'applied_electricity': 'Applied Electricity',
    'arabi': 'Arabic',
    'arithmetics': 'Arithmetics',
    'art': 'Art',
    'auto_mechanics': 'Auto Mechanics',
    'awaiting_results': 'Awaiting Results',
    'basic_electricity': 'Basic Electricity',
    'bible_knowledge': 'Bible Knowledge',
    'biology': 'Biology',
    'biology_alt_syl': 'Biology (Alt.Syl)',
    'book_keeping': 'Book Keeping',
    'building_construction': 'Building Construction',
    'business_management': 'Business Management',
    'business_construction_management': 'Business/Construction Management (Adv)',
    'chemistry': 'Chemistry',
    'chemistry_alt_syl': 'Chemistry (Alt.Syl)',
    'christian_religious_studies': 'Christian Religious Studies',
    'class_teaching': 'Class Teaching',
    'clerical_office_duties': 'Clerical Office Duties',
    'clothing_and_textiles': 'Clothing and Textiles',
    'commerce': 'Commerce',
    'economics': 'Economics',
    'education': 'Education',
    'efik': 'Efik',
    'electronics': 'Electronics',
    'elementary_surveying': 'Elementary Surveying',
    'english_language': 'English Language',
    'engineering_science': 'Engineering Science',
    'financial_accounting': 'Financial Accounting',
    'food_and_nutrition': 'Food and Nutrition',
    'french': 'French',
    'further_mathematics': 'Further Mathematics',
    'general_science': 'General Science',
    'geography': 'Geography',
    'german': 'German',
    'government': 'Government',
    'hausa': 'Hausa',
    'hausa_literature': 'Hausa Literature',
    'health_science': 'Health Science',
    'history': 'History',
    'home_management': 'Home Management',
    'human_biology': 'Human Biology',
    'industrial_electrical_installation': 'Industrial Elect Installation (Adv)',
    'intergrated_science': 'Intergrated Science',
    'islamic_studies': 'Islamic Studies',
    'literature_in_english': 'Literature in English',
    'literature_in_nigerian_languages': 'Literature in Nigerian Languages',
    'igbo': 'Igbo',
    'igbo_literature': 'Igbo Literature',
    'yoruba': 'Yoruba',
    'yoruba_literature': 'Yoruba Literature',
    'management_in_living': 'Management in Living',
    'mathematics': 'Mathematics',
    'metalwork': 'Metalwork',
    'music': 'Music',
    'nigerian_language': 'Nigerian Language',
    'office_practice': 'Office Practice',
    'physical_education': 'Physical Education',
    'physical_health_education': 'Physical and Health Education',
    'physics': 'Physics',
    'physics_alt_syl': 'Physics (Alt.Syl)',
    'principles_and_practice_of_education': 'Principles and Practice of Education',
    'principles_of_cost_accounting': 'Principles of Cost Accounting',
    'rural_science': 'Rural Science',
    'science': 'Science',
    'secretarial_duties': 'Secretarial Duties',
    'shorthand': 'Shorthand',
    'sierra_leone_studies': 'Sierra Leone Studies',
    'sierra_leone_languages': 'Sierra Leone Languages',
    'social_studies': 'Social Studies',
    'statistics': 'Statistics',
    'teaching_practice': 'Teaching Practice',
    'technical_drawing': 'Technical Drawing',
    'typewriting': 'Typewriting',
    'visual_art': 'Visual Art',
    'woodwork': 'Woodwork',
    'winding_elect_machines': 'Winding of Elect Machines and Elect Eng Sc',
    'first_written': 'First Written',
    'second_written': 'Second Written',
    'pract_tests': 'Practical Tests',
    # Added 25/08/2014
    'animal_husbandry_(alt_a)': 'Animal Husbandry (Alt A)',
    'animal_husbandry_(alt_b)': 'Animal Husbandry (Alt B)',
    'auto_electrical_work': 'Auto Electrical Work',
    'auto_mechanical_work': 'Auto Mechanical Work',
    'catering_craft_practice': 'Catering Craft Practice',
    'civic_education': 'Civic Education',
    'computer_studies': 'Computer Studies',
    'cosmetology': 'Cosmetology',
    'data_processing': 'Data Processing',
    'dyeing_&_bleaching': 'Dyeing & Bleaching',
    'electrical_installation_and_maintenance_work': 'Electrical Installation and Maintenance Work',
    'fisheries_(alt_a)_ghana_candidates': 'Fisheries (Alt A) Ghana Candidates',
    'fisheries_(alt_b)_nigeria_candidates': 'Fisheries (Alt B) Nigeria Candidates',
    'garment_making': 'Garment Making',
    'general_agriculture': 'General Agriculture',
    'gsm_phones_maintenance_and_repairs': 'Gsm Phones Maintenance and Repairs',
    'health_education': 'Health Education',
    'insurance': 'Insurance',
    'painting_and_decorating': 'Painting and Decorating',
    'photography': 'Photography',
    'printing_craft_practice': 'Printing Craft Practice',
    'store_management': 'Store Management',
    'textiles': 'Textiles',
    # Added 19/01/2015
    'marketing': 'Marketing',
    'carpentry_joinery': 'Carpentry and Joinery',
    'tourism': 'Tourism',
    'mining': 'Mining',
    }

EXAM_GRADES = (
    ('A1', 'Excellent (A1)'),
    ('A2', 'Very Good (A2)'),
    ('A3', 'Good (A3)'),
    ('B2', 'Very Good (B2)'),
    ('B3', 'Good (B3)'),
    ('C4', 'Credit (C4)'),
    ('C5', 'Credit (C5)'),
    ('C6', 'Credit (C6)'),
    ('A', 'Pass (A)'),
    ('B', 'Pass (B)'),
    ('C', 'Pass (C)'),
    ('U', 'Pass (U)'),
    ('D7', 'Pass (D7)'),
    ('P7', 'Pass (P7)'),
    ('P8', 'Pass (P8)'),
    ('E8', 'Pass (E8)'),
    ('F9', 'Fail (F9)'),
    ('Aa', 'A (a)'),
    ('Bb', 'B (b)'),
    ('Cc', 'C (c)'),
    ('Dd', 'D (d)'),
    ('Ee', 'E (e)'),
    ('Ff', 'F (f)'),
    ('Gg', 'G (g)'),
    ('credit-1', 'Credit-1'),
    ('credit-2', 'Credit-2'),
    ('dist', 'Distinction'),
    ('pass', 'Pass'),
    ('AR', 'Awaiting Results'),
    )


class SubjectSource(BasicSourceFactory):
    """A source for school subjects used in exam documentation.
    """
    def getValues(self):
        return sorted(EXAM_SUBJECTS_DICT.keys())

    def getTitle(self, value):
        return "%s:" % EXAM_SUBJECTS_DICT[value]


class GradeSource(BasicSourceFactory):
    """A source for exam grades.
    """
    def getValues(self):
        for entry in EXAM_GRADES:
            yield entry[0]

    def getTitle(self, value):
        return dict(EXAM_GRADES)[value]


class IResultEntry(Interface):
    """A school grade entry.
    """
    subject = schema.Choice(
        title = _(u'Subject'),
        source = SubjectSource(),
        )
    grade = schema.Choice(
        title = _(u'Grade'),
        source = GradeSource(),
        )


class IResultEntryField(IObject):
    """A zope.schema-like field for usage in interfaces.

    Marker interface to distuingish result entries from ordinary
    object fields. Needed for registration of widgets.
    """


#: A unique default value.
DEFAULT_VALUE = object()


class ResultEntry(grok.Model):
    """A result entry contains a subject and a grade.
    """
    grok.implements(IResultEntry)
    subject = FieldProperty(IResultEntry['subject'])
    grade = FieldProperty(IResultEntry['grade'])

    def __init__(self, subject=None, grade=None):
        super(ResultEntry, self).__init__()
        if subject is not None:
            self.subject = subject
        if grade is not None:
            self.grade = grade
        return

    def __eq__(self, obj):
        """Two ResultEntry objects are equal if their `subject` and
           `grade` are equal.
        """
        for name in ('subject', 'grade',):
            if getattr(self, name) != getattr(obj, name, DEFAULT_VALUE):
                return False
        return True

    def __ne__(self, other):
        """Two ResultEntries are not equal, if their equality test fails.

        a != b <-> not(a == b). Python doc tell, that __ne__ should
        also be rovided, whenever __eq__ is implemented.
        """
        return not self.__eq__(other)

    def to_string(self):
        """A string representation that can be used in exports.

        Returned is a unicode string of format ``(u'<SUBJ>',u'<GRADE>')``.
        """
        return unicode((self.subject, self.grade))

    @classmethod
    def from_string(cls, string):
        """Create new ResultEntry instance based on `string`.

        The string is expected to be in format as delivered by
        meth:`to_string`.

        This is a classmethod. This means, you normally will call::

          ResultEntry.from_string(mystring)

        i.e. use the `ResultEntry` class, not an instance thereof.
        """
        string = string.replace("u''", "None")
        subject, grade = eval(string)
        return cls(subject, grade)


class ResultEntryField(schema.Object):
    """A zope.schema-like field for usage in interfaces.

    If you want to define an interface containing result entries, you
    can do so like this::

      class IMyInterface(Interface):
          my_result_entry = ResultEntryField()

    Default widgets are registered to render result entry fields.
    """
    grok.implements(IResultEntryField)

    def __init__(self, **kw):
        super(ResultEntryField, self).__init__(IResultEntry, **kw)
        return


# register IkobaObjectWidgets as default widgets for IResultEntryFields
@grok.adapter(IResultEntryField, IBrowserRequest)
@grok.implementer(IInputWidget)
def result_entry_input_widget(obj, req):
    return IkobaObjectWidget(obj, req, ResultEntry)


# register a display widget for IResultEntryFields
@grok.adapter(IResultEntryField, IBrowserRequest)
@grok.implementer(IDisplayWidget)
def result_entry_display_widget(obj, req):
    return IkobaObjectDisplayWidget(obj, req, ResultEntry)