"""
    This file is part of python-webuntis

    :copyright: (c) 2013 by Markus Unterwaditzer.
    :license: BSD, see LICENSE for more details.
"""
import datetime

from webuntis.utils import datetime_utils, lazyproperty, \
    timetable_utils


class Result(object):
    """Base class used to represent most API objects.

    :param data: Usually JSON data that should be represented.

                 In the case of :py:class:`ListResult`, however, it might also
                 be a list of JSON mixed with :py:class:`ListItem` objects.

    :param parent: (optional) A result object this result should be the child
                    of. If given, the session will be inherited.

    :param session: Mandatory if ``parent`` is not supplied. Overrides the
                    parent's inherited session.

    """

    def __init__(self, data, parent=None, session=None):
        if bool(parent is None) == bool(session is None):
            raise TypeError('Either parent or session has to be provided.')

        if parent is not None and not hasattr(parent, '_session'):
            raise TypeError('Parent must have a _session attribute.')

        self._session = session or parent._session
        self._parent = parent
        self._data = data

    @lazyproperty
    def id(self):
        """The ID of this element.

        An ID is needed for the object to be hashable. Therefore a result
        may bring its own implementation of this method even though the
        original API response didn't contain any ID."""
        return self._data[u'id'] if 'id' in self._data else None

    def __int__(self):
        """This is useful if the users pass a ListItem when a numerical ID
        is expected, so we just can put the thing through int(), regardless of
        what type it is."""
        assert self.id is not None
        return self.id

    def __hash__(self):
        assert self.id is not None
        return hash(self.__class__.__name__) * 101 + self.id

    def __eq__(self, other):
        return type(self) is type(other) and hash(self) == hash(other)

    def __getstate__(self):
        return self._data

    def __setstate__(self, data):
        self._data = data

    def __str__(self):
        """a simple to string function: just the name or the full info -- debug only"""
        try:
            return self._data[u'name']
        except KeyError:
            try:
                return self.name
            except AttributeError:
                return str(self._data)
        except TypeError:
            return str(self._data)

    def __repr__(self):
        try:
            return self.__class__.__qualname__ + "(" + str(self._data) + ")"
        except AttributeError:
            return self.__class__.__name__ + "(" + str(self._data) + ")"


class ListItem(Result):
    """ListItems represent an item in a
    :py:class:`Result`. They don\'t contain methods to
    retrieve data."""


class ListResult(Result):
    """A list-like version of :py:class:`Result` that takes a list and returns
    a list of objects, containing a list value each.

        """

    # When the Result returns an array, this is very useful. Every item of that
    # array will be fed to an instance of self._itemclass, with the session and
    # the array item as initialization arguments.

    #: the class which should be used to instantiate an array item.
    _itemclass = ListItem

    def filter(self, **criterions):
        """
        Return a list of all objects, filtered by attributes::

            foo = s.klassen().filter(id=1)  # is kind-of the same as
            foo = [kl for kl in s.klassen() if kl.id == 1]

            # We can also use sets to match multiple values.
            bar = s.klassen().filter(name={'1A', '2A', '3A', '4A'})
            # is kind-of the same as
            bar = [kl for kl in s.klassen()
                   if kl.id in {'1A', '2A', '3A', '4A'}]

            # Or you can use a list: this keeps the order: the first element
            # of the result corresponds to the first element in the filter
            # Important after using combine()
            bar = s.klassen().filter(name=['1A', '2A', '3A', '4A'])
            # --> bar[0].name == '1A'

            # Since ``filter`` returns a ListResult itself too, we can chain
            # multiple calls together:
            bar = s.klassen().filter(id=4, name='7A')  # is the same as
            bar = s.klassen().filter(id=4).filter(name='7A')

        :py:meth:`filter` is also used when using the ``in`` operator on a
        :py:class:`ListResult`::

            we_have_it = {'name': '6A'} in s.klassen()  # same as
            we_have_it = bool(s.klassen().filter(name='6A'))


        .. note::
            This is only available because it looks nicer than list
            comprehensions or generator expressions. Depending on your usecase
            alternatives to this method may be faster.

        """
        criterions = list(criterions.items())

        def meets_criterions(item):
            """Returns true if the item meets the criterions"""
            for key, value in criterions:
                # if the attribute value isn't one we're looking for
                attribute = getattr(item, key)
                if attribute == value:
                    continue
                elif isinstance(value, set) and attribute in value:
                    continue
                else:
                    return False

            return True

        if isinstance(criterions[0][1], list):
            return type(self)(
                parent=self,
                data=[self.filter(**{key: v})[0]
                      for key, values in criterions
                      for v in values
                      ])

        return type(self)(
            parent=self,
            data=[item for item in self if meets_criterions(item)]
        )

    def __contains__(self, criterion):
        if isinstance(criterion, self._itemclass):
            return any(item is criterion for item in self)
        return bool(self.filter(**criterion))

    def __getitem__(self, i):
        """Makes the object iterable and behave like a list"""
        data = self._data[i]  # fails if there is no such item

        if type(data) is not self._itemclass:
            data = self._data[i] = self._itemclass(
                parent=self,
                data=data
            )

        return data

    def __len__(self):
        """Return the length of the items"""
        return len(self._data)

    def __hash__(self):
        raise NotImplementedError()

    def __eq__(self, other):
        return type(other) is type(self) and other._data == self._data

    def __str__(self):
        """a simple to string function: a list of results -- debug only"""
        return "[" + ", ".join(str(d) for d in self._data) + "]"

    def __repr__(self):
        """a simple to string function: a list of results -- debug only"""
        try:
            return self.__class__.__qualname__ + "[" + ", ".join(repr(d) for d in self._data) + "]"
        except AttributeError:
            return self.__class__.__name__ + "[" + ", ".join(repr(d) for d in self._data) + "]"


class DepartmentObject(ListItem):
    """Represents a department"""

    @lazyproperty
    def name(self):
        """short name such as *R1A*"""
        return self._data[u'name']

    @lazyproperty
    def long_name(self):
        """Long name, such as *Raum Erste A*. Not predictable."""
        return self._data[u'longName']


class DepartmentList(ListResult):
    """A list of departments, in form of :py:class:`DepartmentObject`
    instances."""
    _itemclass = DepartmentObject


class HolidayObject(ListItem):
    """Represents a single holiday."""

    @lazyproperty
    def start(self):
        """The start date of the holiday, as a datetime object."""
        return datetime_utils.parse_date(self._data[u'startDate'])

    @lazyproperty
    def end(self):
        """The end of the holiday"""
        return datetime_utils.parse_date(self._data[u'endDate'])

    @lazyproperty
    def name(self):
        """Name, such as *Nationalfeiertag*."""
        return self._data[u'longName']

    @lazyproperty
    def short_name(self):
        """Abbreviated form of the name"""
        return self._data[u'name']


class HolidayList(ListResult):
    """A list of holidays, in form of :py:class:`HolidayObject`
    instances."""
    _itemclass = HolidayObject


class ColorMixin:
    """Interface support fore/back color"""

    @lazyproperty
    def forecolor(self):
        """The foreground color used in the web interface and elsewhere"""
        return self._data[self.name][u'foreColor']

    @lazyproperty
    def backcolor(self):
        """The background color used in the web interface and elsewhere"""
        return self._data[self.name][u'backColor']


class KlassenObject(ListItem, ColorMixin):
    """Represents a school class."""

    @lazyproperty
    def name(self):
        """Name of class"""
        return self._data[u'name']

    @lazyproperty
    def long_name(self):
        """Long name of class"""
        return self._data[u'longName']


class KlassenList(ListResult):
    """A list of school classes, in form of :py:class:`KlassenObject`
    instances."""
    _itemclass = KlassenObject


class PeriodObject(ListItem):
    """Represents a time range, where lessons/subjects may be held."""

    @lazyproperty
    def start(self):
        """The start date/time of the period, as datetime object."""

        return datetime_utils.parse_datetime(
            self._data[u'date'],
            self._data[u'startTime']
        )

    @lazyproperty
    def end(self):
        """The end date/time of the period."""

        return datetime_utils.parse_datetime(
            self._data[u'date'],
            self._data[u'endTime']
        )

    @lazyproperty
    def klassen(self):
        """A :py:class:`KlassenList` containing the classes which are attending
        this period."""

        return self._session.klassen(from_cache=True).filter(
            id=[kl[u'id'] for kl in self._data[u'kl']]
        )

    @lazyproperty
    def teachers(self):
        """A list of :py:class:`TeacherObject` instances,
        which are attending this period."""

        return self._session.teachers(from_cache=True).filter(
            id=[te[u'id'] for te in self._data[u'te']]
        )

    @lazyproperty
    def subjects(self):
        """A :py:class:`SubjectList` containing the subjects which are topic of
        this period. This is not used for things like multiple language lessons
        (*e.g.* Latin, Spanish, French) -- each of those will get placed in
        their own period."""

        return self._session.subjects(from_cache=True).filter(
            id=[su[u'id'] for su in self._data[u'su']]
        )

    @lazyproperty
    def rooms(self):
        """The rooms (:py:class:`RoomList`) where this period is taking place
        at. This also is not used for multiple lessons, but rather for a single
        lesson that is actually occuring at multiple locations (?)."""

        return self._session.rooms(from_cache=True).filter(
            id=[ro[u'id'] for ro in self._data[u'ro']]
        )

    @lazyproperty
    def code(self):
        """May be:

          - ``None`` -- There's nothing special about this period.
          - ``"cancelled"`` -- Cancelled
          - ``"irregular"`` -- Substitution/"Supplierung"/Not planned event
        """
        code = self._data.get(u'code', None)
        if code in (None, u'cancelled', u'irregular'):
            return code
        return None

    @lazyproperty
    def original_teachers(self):
        """ Support for original teachers """
        try:
            return self._session.teachers(from_cache=True).filter(id=[te[u'orgid'] for te in self._data[u'te']])
        except KeyError:
            pass
        return []

    @lazyproperty
    def original_rooms(self):
        """ Support for original rooms """
        try:
            return self._session.rooms(from_cache=True).filter(id=[ro[u'orgid'] for ro in self._data[u'ro']])
        except KeyError:
            pass
        return []

    @lazyproperty
    def type(self):
        """May be:

          - ``"ls"`` -- Normal lesson
          - ``"oh"`` -- Office hour
          - ``"sb"`` -- Standby
          - ``"bs"`` -- Break Supervision
          - ``"ex"`` -- Examination
        """

        return self._data.get(u'lstype', u'ls')


class PeriodList(ListResult):
    """Aka timetable, a list of periods, in form of :py:class:`PeriodObject`
    instances."""
    _itemclass = PeriodObject

    def to_table(self, dates=None, times=None):
        """
        Creates a table-like structure out of the periods. Useful for rendering
        timetables in HTML and other markup languages.

        Check out the example from the repository for clarification.

        :param dates: An iterable of :py:class:`datetime.date` objects that
            definetly should be included in the table. If this parameter is
            ``None``, the timetable is just as wide as it has to be, leaving
            out days without periods.

        :param times: An iterable of :py:class:`datetime.time` objects that
            definetly should be included in the table. If this parameter is
            ``None``, the timetable is just as tall as it has to be, leaving
            out hours without periods.

        :returns: A list containing "rows", which in turn contain "hours",
            which contain :py:class:`webuntis.objects.PeriodObject` instances
            which are happening at the same time.

        """

        return timetable_utils.table(self, dates=dates, times=times)

    def combine(self, combine_breaks=True):
        """
        Combine consecutive entries
        :param combine_breaks: combine of breaks
        :return:
        """
        return timetable_utils.combine(self, {'date', 'activityType', 'su', 'kl'}, combine_breaks)


class RoomObject(ListItem, ColorMixin):
    """Represents a physical room. Such as a classroom, but also the physics
    lab or whatever.
    """

    @lazyproperty
    def name(self):
        """The short name of the room. Such as PHY."""
        return self._data[u'name']

    @lazyproperty
    def long_name(self):
        """The long name of the room. Such as "Physics lab"."""
        return self._data[u'longName']


class RoomList(ListResult):
    """A list of rooms, in form of :py:class:`RoomObject` instances."""
    _itemclass = RoomObject


class SchoolyearObject(ListItem):
    """Represents a schoolyear."""

    @lazyproperty
    def name(self):
        """"2010/2011\""""

        return self._data[u'name']

    @lazyproperty
    def start(self):
        """The start date of the schoolyear, as datetime object"""
        return datetime_utils.parse_date(self._data[u'startDate'])

    @lazyproperty
    def end(self):
        """The end date"""
        return datetime_utils.parse_date(self._data[u'endDate'])

    @lazyproperty
    def is_current(self):
        """
        Boolean, check if this is the current schoolyear::

            >>> import webuntis
            >>> s = webuntis.Session(...).login()
            >>> y = s.schoolyears()
            >>> y.current.id
            7
            >>> y.current.is_current
            True
            >>> y.filter(id=y.current.id).is_current
            True

        """
        return self == self._parent.current


class SchoolyearList(ListResult):
    """A list of schoolyears, in form of :py:class:`SchoolyearObject`
    instances."""
    _itemclass = SchoolyearObject

    @lazyproperty
    def current(self):
        """Returns the current schoolyear in form of a
        :py:class:`SchoolyearObject`"""
        current_data = self._session._request(u'getCurrentSchoolyear')
        current = self.filter(id=current_data[u'id'])[0]
        return current


class SubjectObject(ListItem, ColorMixin):
    """Represents a subject."""

    @lazyproperty
    def name(self):
        """Short name of subject, such as *PHY*"""
        return self._data[u'name']

    @lazyproperty
    def long_name(self):
        """Long name of subject, such as *Physics*"""
        return self._data[u'longName']


class SubjectList(ListResult):
    """A list of subjects, in form of :py:class:`SubjectObject` instances."""
    _itemclass = SubjectObject


class PersonObject(ListItem):
    """Represents a person (teacher or student)."""

    @lazyproperty
    def fore_name(self):
        """fore name of the person"""
        return self._data[u'foreName']

    @lazyproperty
    def long_name(self):
        """surname of person"""
        return self._data[u'longName']

    surname = long_name

    @lazyproperty
    def name(self):
        """full name of the person"""
        return self._data[u'name']


class TeacherObject(PersonObject):
    """Represents a teacher."""

    @lazyproperty
    def title(self):
        """title of the teacher"""
        return self._data[u'title']

    @lazyproperty
    def full_name(self):
        """full name of teacher (title, forname, longname"""
        return " ".join((self.title, self.fore_name, self.long_name)).strip()


class TeacherList(ListResult):
    """A list of teachers, in form of :py:class:`TeacherObject` instances."""
    _itemclass = TeacherObject


class ColorInfo(Result, ColorMixin):
    """
    An object containing information about a lesson type or a period code::

        >>> import webuntis
        >>> s = webuntis.Session(...).login()
        >>> lstype = s.statusdata().lesson_types[0]
        >>> lstype.name
        'ls'
        >>> lstype.forecolor
        '000000'
        >>> lstype.backcolor
        'ee7f00'

    ::

        >>> pcode = s.statusdata().period_codes[0]
        >>> pcode.name
        'cancelled'
        >>> pcode.forecolor
        'FFFFFF'
        >>> pcode.backcolor
        'FF0000'

    """

    @lazyproperty
    def id(self):
        return hash(self.__class__.__name__ + self.name)

    @lazyproperty
    def name(self):
        """The name of the LessonType or PeriodCode"""
        return list(self._data.items())[0][0]


class StatusData(Result):
    """Information about lesson types and period codes and their colors."""

    @lazyproperty
    def lesson_types(self):
        """A list of :py:class:`ColorInfo` objects, containing
        information about all lesson types defined

        :rtype: `list`          [ColorInfo]
        """
        return [
            ColorInfo(parent=self, data=data)
            for data in self._data[u'lstypes']
        ]

    @lazyproperty
    def period_codes(self):
        """A list of :py:class:`ColorInfo` objects, containing
        information about all period codes defined

        :rtype: `list`         [ColorInfo]
        """
        return [
            ColorInfo(parent=self, data=data)
            for data in self._data[u'codes']
        ]


class TimeStampObject(Result):
    """Information about last change of data -- timestamp (given in milliseconds)"""

    @lazyproperty
    def date(self):
        """
        get timestamp as python datetime object

        :return: datetime.datetime
        """
        return datetime.datetime.fromtimestamp(self._data / 1000)


class SubstitutionObject(PeriodObject):
    """Information about substitution."""

    @lazyproperty
    def type(self):
        """type of substitution
             cancel   cancellation
             subst    teacher substitution
             add      additional period
             shift    shifted period
             rmchg    room change

        :rtype: str
        """
        return self._data[u'type']

    @lazyproperty
    def reschedule_start(self):
        """The start of the rescheduled substitution (or None)

        :return: datetime.datetime
        """
        try:
            return datetime_utils.parse_datetime(self._data[u'reschedule'][u'date'],
                                                 self._data[u'reschedule'][u'startTime'])
        except KeyError:
            return None

    @lazyproperty
    def reschedule_end(self):
        """The end of the rescheduled substitution (or None)

        :return: datetime.datetime
        """
        try:
            return datetime_utils.parse_datetime(self._data[u'reschedule'][u'date'],
                                                 self._data[u'reschedule'][u'endTime'])
        except KeyError:
            return None


class SubstitutionList(ListResult):
    """A list of substitutions in form of :py:class:`SubstitutionObject` instances."""
    _itemclass = SubstitutionObject

    def combine(self, combine_breaks=True):
        """
        Combine consecutive entries
        :param combine_breaks: combine of breaks
        :return:
        """
        return timetable_utils.combine(self,
                                       {'date', 'type', 'kl', 'su'},
                                       combine_breaks,
                                       lambda p: (p['type'],
                                                  str(p[u'te'] and p[u'te'][0][u'name']),
                                                  p[u'date'],
                                                  p[u'startTime']))


class TimeUnitObject(Result):
    """Information about the time grid"""

    @lazyproperty
    def name(self):
        """Name of Timeunit"""
        return self._data[u'name']

    @lazyproperty
    def start(self):
        return datetime_utils.parse_time(
            self._data[u'startTime']
        ).time()

    @lazyproperty
    def end(self):
        return datetime_utils.parse_time(
            self._data[u'endTime']
        ).time()


class TimegridDayObject(Result):
    """Information about one day in the time grid"""

    @lazyproperty
    def day(self):
        return self._data[u'day']

    @lazyproperty
    def dayname(self):
        names = {1: "sunday", 2: "monday", 3: "tuesday", 4: "wednesday", 5: "thursday", 6: "friday", 7: "saturday"}
        return names[self._data[u'day']]

    @lazyproperty
    def time_units(self):
        return [
            TimeUnitObject(parent=self, data=data)
            for data in self._data[u'timeUnits']
        ]


class TimegridObject(ListResult):
    """A list of TimegridDayObjects
    """
    _itemclass = TimegridDayObject


class StudentObject(PersonObject):
    """Represents a student."""

    @lazyproperty
    def full_name(self):
        """full name of student (forname, longname)"""
        return " ".join((self.fore_name, self.long_name)).strip()

    @lazyproperty
    def gender(self):
        return self._data[u'gender']

    @lazyproperty
    def key(self):
        return self._data[u'key']


class StudentsList(ListResult):
    """A list of students"""
    _itemclass = StudentObject


class ExamTypeObject(Result):
    """Represents an Exam Type."""

    @lazyproperty
    def long_name(self):
        """Long name"""
        return self._data[u'longName']

    @lazyproperty
    def name(self):
        """name"""
        return self._data[u'name']

    @lazyproperty
    def show_in_timetable(self):
        """show this exam type in the timetable"""
        return self._data[u'showInTimetable']


class ExamTypeList(ListResult):
    """A list of exam types"""
    _itemclass = ExamTypeObject


class ExamObject(Result):
    """Represents an Exam."""

    # classes  list of classes
    # teachers list of teachers
    # students list of students
    # subject

    @lazyproperty
    def start(self):
        """The start date/time of the period, as datetime object."""

        return datetime_utils.parse_datetime(
            self._data[u'date'],
            self._data[u'startTime']
        )

    @lazyproperty
    def end(self):
        """The end date/time of the period."""

        return datetime_utils.parse_datetime(
            self._data[u'date'],
            self._data[u'endTime']
        )

    @lazyproperty
    def klassen(self):
        """A :py:class:`KlassenList` containing the classes which are attending
        this period."""

        return self._session.klassen(from_cache=True).filter(
            id=set(self._data[u'classes'])
        )

    @lazyproperty
    def teachers(self):
        """A list of :py:class:`TeacherObject` instances,
        which are attending this period."""

        return self._session.teachers(from_cache=True).filter(
            id=set(self._data[u'teachers'])
        )

    @lazyproperty
    def subject(self):
        """A :py:class:`SubjectObject` with the subject which are topic of
        this period."""
        return self._session.subjects(from_cache=True).filter(id=self._data[u'subject'])[0]

    @lazyproperty
    def students(self):
        """A list of :py:class:`StudentObject` instances,
        which are attending this period."""

        return self._session.students(from_cache=True).filter(
            id=set(self._data[u'students'])
        )


class ExamsList(ListResult):
    """A list of exams."""
    _itemclass = ExamObject


class AbsenceObject(Result):
    """Represents an absence.

    Attention: if there are multiple teachers/groups at the same time -> multiple entries for the
    same student, but the absentTime is only set for one (the first?) entry.
    """

    @lazyproperty
    def student(self):
        """
        doku says: student ID, but it is the students KEY
        :return:
        """
        return self._session.students(from_cache=True).filter(key=self._data[u'studentId'])[0]

    @lazyproperty
    def subject(self):
        """@TODO: untested - always empty"""
        try:
            sid = int(self._data[u'subjectId'])
        except ValueError:
            return ""
        return self._session.subjects(from_cache=True).filter(id=sid)[0]

    @lazyproperty
    def teachers(self):
        """@TODO: untested - always empty"""
        try:
            tes = list(int(te) for te in self._data[u'teacherIds'] if te)
        except ValueError:
            return []

        return self._session.teachers(from_cache=True).filter(id=tes)

    @lazyproperty
    def student_group(self):
        try:
            return self._data[u'studentGroup']
        except KeyError:
            return ''

    @lazyproperty
    def checked(self):
        return self._data[u'checked']

    @lazyproperty
    def name(self):
        """Name of absent student"""
        return self.student.full_name

    @lazyproperty
    def start(self):
        """The start date/time of the period, as datetime object."""

        return datetime_utils.parse_datetime(
            self._data[u'date'],
            self._data[u'startTime']
        )

    @lazyproperty
    def end(self):
        """The end date/time of the period."""

        return datetime_utils.parse_datetime(
            self._data[u'date'],
            self._data[u'endTime']
        )

    @lazyproperty
    def reason(self):
        try:
            return self._data[u'absenceReason']
        except KeyError:
            return ''

    @lazyproperty
    def time(self):
        try:
            return int(self._data[u'absentTime'])
        except KeyError:
            return 0

    @lazyproperty
    def status(self):
        try:
            return self._data[u'excuseStatus']
        except KeyError:
            return ''


class AbsencesList(ListResult):
    """A list of absences."""
    _itemclass = AbsenceObject

    def __init__(self, data, parent=None, session=None):
        # the data is a dict() with just one key
        data = data[u'periodsWithAbsences']
        Result.__init__(self, data, parent, session)


class ClassRegEvent(Result):
    """Represents an ClassRegEvent."""

    @lazyproperty
    def student(self):
        """
        doku says: student ID, but it is the students KEY

        :return:
        """
        return self._session.students(from_cache=True).filter(key=self._data[u'studentid'])[0]

    @lazyproperty
    def sur_name(self):
        """sur name of the person"""
        return self._data[u'surname']

    @lazyproperty
    def fore_name(self):
        """fore name of the person"""
        return self._data[u'forname']

    @lazyproperty
    def name(self):
        """fore name of the person"""
        return " ".join((self.sur_name, self.fore_name))

    @lazyproperty
    def reason(self):
        """reason of the classregevent"""
        return self._data[u'reason']

    @lazyproperty
    def text(self):
        """text of the classregevent"""
        return self._data[u'text']

    @lazyproperty
    def date(self):
        """the date of the classregevent."""
        return datetime_utils.parse_date(self._data[u'date'])

    @lazyproperty
    def subject(self):
        """the subject of the classregevent."""
        return self._data[u'subject']

    @lazyproperty
    def category(self):
        """which category"""
        return self._session.class_reg_categories(from_cache=True).filter(
            id=set(self._data[u'categoryId'])
        )[0]


class ClassRegEventList(ListResult):
    """A list of ClassRegEvents."""
    _itemclass = ClassRegEvent


class ClassRegCategory(Result):
    """Represents an ClassRegCategory."""

    @lazyproperty
    def name(self):
        """name of category"""
        return self._data[u'name']

    @lazyproperty
    def longname(self):
        """longname of category"""
        return self._data[u'longName']

    @lazyproperty
    def group(self):
        """group"""
        return self._session.class_reg_category_groups().filter(id=self._data[u'groupId'])[0]


class ClassRegCategoryList(ListResult):
    """A list of ClassRegCategories."""
    _itemclass = ClassRegCategory


class ClassRegCategoryGroup(Result):
    """Represents an ClassRegCategoryGroup."""

    @lazyproperty
    def name(self):
        """name of group"""
        return self._data[u'name']


class ClassRegCategoryGroupList(ListResult):
    """A list of ClassRegCategoriesGroups."""
    _itemclass = ClassRegCategoryGroup