##
## interfaces.py
from zope.interface import Attribute, invariant
from zope.interface.exceptions import Invalid
from zope import schema
from waeup.sirp.interfaces import IWAeUPObject
from waeup.sirp.schema import TextLineChoice
from waeup.sirp.university.vocabularies import CourseSource
from waeup.sirp.students.vocabularies import (
  CertificateSource, academic_sessions_vocab, verdicts, StudyLevelSource,
  contextual_reg_num_source, contextual_mat_num_source,
  )

class IStudentsContainer(IWAeUPObject):
    """An students container contains university students.

    """

    def addStudent(student):
        """Add an IStudent object and subcontainers.

        """

    def archive(id=None):
        """Create on-dist archive of students.

        If id is `None`, all students are archived.

        If id contains a single id string, only the respective
        students are archived.

        If id contains a list of id strings all of the respective
        students types are saved to disk.
        """

    def clear(id=None, archive=True):
        """Remove students of type given by 'id'.

        Optionally archive the students.

        If id is `None`, all students are archived.

        If id contains a single id string, only the respective
        students are archived.

        If id contains a list of id strings all of the respective
        student types are saved to disk.

        If `archive` is ``False`` none of the archive-handling is done
        and respective students are simply removed from the
        database.
        """

class IStudentNavigation(IWAeUPObject):
    """Interface needed for student navigation.
    """

    def getStudent():
        """Return student object.
        """

class IStudentPasswordSetting(IWAeUPObject):
    """Data needed for password setting.
    """
    name = schema.TextLine(
        title = u'Full Name',
        default = u'Nobody',
        required = True,
        readonly = True
        )

    password = schema.Password(
        title = u'New password',
        required = False,
        )

    password_repeat = schema.Password(
        title = u'Retype new password',
        required = False,
        )

    @invariant
    def passwords_match(obj):
        if obj.password == obj.password_repeat:
            return
        raise Invalid('passwords do not match')

class IStudentBase(IWAeUPObject):
    """Representation of student base data.
    """
    history = Attribute('Object history, a list of messages.')
    state = Attribute('Returns the registration state of a student')
    password = Attribute('Encrypted password of a student')

    def loggerInfo(ob_class, comment):
        """Adds an INFO message to the log file
        """

    student_id = schema.TextLine(
        title = u'Student ID',
        required = True,
        )

    name = schema.TextLine(
        title = u'Full Name',
        default = u'Nobody',
        required = True,
        )

    reg_number = TextLineChoice(
        title = u'Registration Number',
        #default = u'',
        required = True,
        readonly = False,
        source = contextual_reg_num_source,
        )

    matric_number = TextLineChoice(
        title = u'Matriculation Number',
        #default = u'',
        required = False,
        readonly = False,
        source = contextual_mat_num_source,
        )

    adm_code = schema.TextLine(
        title = u'PWD Access Code',
        default = u'',
        required = False,
        readonly = True,
        )

class IStudentClearance(IWAeUPObject):
    """Representation of student clearance data.
    """

    date_of_birth = schema.Date(
        title = u'Date of Birth',
        required = True,
        )

    clearance_locked = schema.Bool(
        title = u'Clearance form locked',
        default = False,
        )

    clr_code = schema.TextLine(
        title = u'CLR Access Code',
        default = u'',
        required = False,
        readonly = True,
        )

class IStudentPersonal(IWAeUPObject):
    """Representation of student personal data.
    """

    perm_address = schema.Text(
        title = u'Permanent Address',
        required = False,
        )

class IStudent(IStudentBase,IStudentClearance,IStudentPersonal):
    """Representation of a student.
    """

class IStudentStudyCourse(IWAeUPObject):
    """A container for student study levels.

    """

    certificate = schema.Choice(
        title = u'Certificate',
        source = CertificateSource(),
        default = None,
        required = True,
        )

    current_session = schema.Choice(
        title = u'Current Session',
        source = academic_sessions_vocab,
        default = None,
        required = True,
        )

    current_level = schema.Choice(
        title = u'Current Level',
        source = StudyLevelSource(),
        default = None,
        required = False,
        )

    current_verdict = schema.Choice(
        title = u'Current Verdict',
        source = verdicts,
        default = '0',
        required = False,
        )

    previous_verdict = schema.Choice(
        title = u'Previous Verdict',
        source = verdicts,
        default = '0',
        required = False,
        )

class IStudentStudyLevel(IWAeUPObject):
    """A container for course tickets.

    """
    level = Attribute('The level code')
    validation_date = Attribute('The date of validation')
    validated_by = Attribute('User Id of course adviser')

    level_session = schema.Choice(
        title = u'Session',
        source = academic_sessions_vocab,
        default = None,
        required = True,
        )

    level_verdict = schema.Choice(
        title = u'Verdict',
        source = verdicts,
        default = '0',
        required = False,
        )

class ICourseTicket(IWAeUPObject):
    """A course ticket.

    """
    code = Attribute('code of the original course')
    title = Attribute('title of the original course')
    credits = Attribute('credits of the original course')
    passmark = Attribute('passmark of the original course')
    semester = Attribute('semester of the original course')
    faculty = Attribute('faculty of the original course')
    department = Attribute('department of the original course')

    core_or_elective = schema.Bool(
        title = u'Mandatory',
        default = False,
        required = False,
        readonly = False,
        )

    score = schema.Int(
        title = u'Score',
        default = 0,
        required = False,
        readonly = False,
        )

    automatic = schema.Bool(
        title = u'Automatical Creation',
        default = False,
        required = False,
        readonly = True,
        )

class ICourseTicketAdd(ICourseTicket):
    """An interface for adding course tickets

    """
    course = schema.Choice(
        title = u'Course',
        source = CourseSource(),
        readonly = False,
        )

class IStudentAccommodation(IWAeUPObject):
    """A container for student accommodation objects.

    """

class IStudentPayments(IWAeUPObject):
    """A container for student payment objects.

    """

# Interfaces for students only

class IStudentClearanceEdit(IStudentClearance):
    """Interface needed for restricted editing of student clearance data.
    """

class IStudentPersonalEdit(IStudentPersonal):
    """Interface needed for restricted editing of student personal data.
    """