##
## interfaces.py
## Login : <uli@pu.smp.net>
## Started on  Sun Jan 16 15:30:01 2011 Uli Fouquet
## $Id$
##
## 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
##
"""Interfaces regarding student applicants and related components.
"""
import os
import re
import waeup.sirp.browser

from grokcore.content.interfaces import IContainer

from zope import schema
from zope.interface import Interface, Attribute, provider
from zope.component import getUtility, getUtilitiesFor
from zope.pluggableauth.interfaces import IPrincipalInfo
from zope.security.interfaces import IGroupClosureAwarePrincipal as IPrincipal
from zc.sourcefactory.basic import BasicSourceFactory
from waeup.sirp.image.schema import ImageFile
from waeup.sirp.image.image import WAeUPImageFile
from waeup.sirp.interfaces import IWAeUPObject
from waeup.sirp.university.vocabularies import application_categories
from waeup.sirp.applicants.vocabularies import (
  year_range, application_types_vocab, application_pins_vocab,
  lgas_vocab, CertificateSource, AppCatCertificateSource,
  GenderSource, entry_session_vocab
  )

IMAGE_PATH = os.path.join(
    os.path.dirname(waeup.sirp.browser.__file__),
    'static'
    )
DEFAULT_PASSPORT_IMAGE_MALE = open(
    os.path.join(IMAGE_PATH, 'placeholder_m.jpg')).read()
DEFAULT_PASSPORT_IMAGE_FEMALE = open(
    os.path.join(IMAGE_PATH, 'placeholder_f.jpg')).read()

# Define a valiation method for email addresses
class NotAnEmailAddress(schema.ValidationError):
    __doc__ = u"Invalid email address"

check_email = re.compile(r"[a-zA-Z0-9._%-]+@([a-zA-Z0-9-]+.)*[a-zA-Z]{2,4}").match
def validate_email(value):
    if not check_email(value):
        raise NotAnEmailAddress(value)
    return True

@provider(schema.interfaces.IContextAwareDefaultFactory)
def default_passport_image(context):
    """A default value factory for ImageFile fields.

    Returns some default image as WAeUPImageFile. We cannot set the
    default directly in ImageFile fields, as, if we want to set
    max_size or min_size as well, some utility lookups are needed
    which are not possible during startup.

    Developers which use IContextAwareDefaultFactories like this one
    always should make sure that the delivered default meets all
    constraints of the field that makes use of this default value
    provider.
    """
    return WAeUPImageFile(
        'placeholder_m.jpg', DEFAULT_PASSPORT_IMAGE_MALE)

class ApplicantContainerProviderSource(BasicSourceFactory):
    """A source offering all available applicants container types.

    The values returned by this source are names of utilities that can
    create :class:`ApplicantContainer` instances. So, if you get a
    name like ``'myactype'`` from this source, then you can do:

      >>> from zope.component import getUtility
      >>> p = getUtility(IApplicantsContainerProvider, name=myactype)
      >>> my_applicants_container = p.factory()

    Or you can access class-attributes like

      >>> my_applicants_container.container_title
      'Pretty'

    """
    def getValues(self):
        """Returns a list of ``(<name>, <provider>)`` tuples.

        Here ``<name>`` is the name under which an
        :class:``ApplicantContainerProvider`` was registered as a
        utility and ``<provider>`` is the utility itself.
        """
        return getUtilitiesFor(IApplicantsContainerProvider)

    def getToken(self, value):
        """Return the name of the ``(<name>, <provider>)`` tuple.
        """
        return value[0]

    def getTitle(self, value):
        """Get a 'title - description' string for a container type.
        """
        factory = value[1].factory
        return "%s - %s" % (
            factory.container_title, factory.container_description)

class IResultEntry(IWAeUPObject):
    subject = schema.TextLine(
        title = u'Subject',
        description = u'The subject',
        required=False,
        )
    score = schema.TextLine(
        title = u'Score',
        description = u'The score',
        required=False,
        )

class IApplicantsRoot(IWAeUPObject, IContainer):
    """A container for university applicants containers.
    """
    pass

class IApplicantsContainer(IWAeUPObject):
    """An applicants container contains university applicants.

    """

    container_title = Attribute(
        u'classattribute: title for type of container')
    container_description = Attribute(
        u'classattribute: description for type of container')


    code = schema.TextLine(
        title = u'Code',
        default = u'-',
        required = True,
        readonly = True,
        )

    title = schema.TextLine(
        title = u'Title',
        required = True,
        default = u'-',
        readonly = True,
        )

    prefix = schema.Choice(
        title = u'Application target',
        required = True,
        default = None,
        source = application_types_vocab,
        readonly = True,
        )

    year = schema.Choice(
        title = u'Year of entrance',
        required = True,
        default = None,
        values = year_range(),
        readonly = True,
        )

    provider = schema.Choice(
        title = u'Applicants container type',
        required = True,
        default = None,
        source = ApplicantContainerProviderSource(),
        readonly = True,
        )

    ac_prefix = schema.Choice(
        title = u'Access code prefix',
        required = True,
        default = None,
        source = application_pins_vocab,
        )

    application_category = schema.Choice(
        title = u'Category for the grouping of study courses',
        required = True,
        default = None,
        source = application_categories,
        )

    description = schema.Text(
        title = u'Human readable description in reST format',
        required = False,
        default = u'No description yet.'
        )

    startdate = schema.Date(
        title = u'Date when the application period starts',
        required = False,
        default = None,
        )

    enddate = schema.Date(
        title = u'Date when the application period ends',
        required = False,
        default = None,
        )

    strict_deadline = schema.Bool(
        title = u'Forbid additions after deadline (enddate)',
        required = True,
        default = True,
        )

    def archive(id=None):
        """Create on-dist archive of applicants stored in this term.

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

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

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

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

        Optionally archive the applicants.

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

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

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

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

class IApplicantsContainerAdd(IApplicantsContainer):
    """An applicants container contains university applicants.
    """
    prefix = schema.Choice(
        title = u'Application target',
        required = True,
        default = None,
        source = application_types_vocab,
        readonly = False,
        )

    year = schema.Choice(
        title = u'Year of entrance',
        required = True,
        default = None,
        values = year_range(),
        readonly = False,
        )

    provider = schema.Choice(
        title = u'Applicants container type',
        required = True,
        default = None,
        source = ApplicantContainerProviderSource(),
        readonly = False,
        )

IApplicantsContainerAdd[
    'prefix'].order =  IApplicantsContainer['prefix'].order
IApplicantsContainerAdd[
    'year'].order =  IApplicantsContainer['year'].order
IApplicantsContainerAdd[
    'provider'].order =  IApplicantsContainer['provider'].order

class IApplicantBaseData(IWAeUPObject):
    """The data for an applicant.

    This is a base interface with no field (except ``reg_no``)
    required. For use with importers, forms, etc., please use one of
    the derived interfaces below, which set more fields to required
    state, depending on use-case.
    """
    history = Attribute('Object history, a list of messages.')
    state = Attribute('Returns the application state of an applicant')

    def getApplicantsRootLogger():
        """Returns the logger from the applicants root object
        """

    reg_no = schema.TextLine(
        title = u'JAMB Registration Number',
        readonly = True,
        )
    access_code = schema.TextLine(
        title = u'Access Code',
        required = False,
        readonly = True,
        )
    course1 = schema.Choice(
        title = u'1st Choice Course of Study',
        source = AppCatCertificateSource(),
        required = True,
        )
    course2 = schema.Choice(
        title = u'2nd Choice Course of Study',
        source = AppCatCertificateSource(),
        required = False,
        )
    firstname = schema.TextLine(
        title = u'First Name',
        required = True,
        )
    middlenames = schema.TextLine(
        title = u'Middle Names',
        required = False,
        )
    lastname = schema.TextLine(
        title = u'Last Name (Surname)',
        required = True,
        )
    date_of_birth = schema.Date(
        title = u'Date of Birth',
        required = True,
        )
    lga = schema.Choice(
        source = lgas_vocab,
        title = u'State/LGA',
        default = 'foreigner',
        required = True,
        )
    sex = schema.Choice(
        title = u'Sex',
        source = GenderSource(),
        default = u'm',
        required = True,
        )
    email = schema.ASCIILine(
        title = u'Email',
        required = False,
        constraint=validate_email,
        )
    phone = schema.Int(
        title = u'Phone',
        description = u'Enter phone number with country code and without spaces.',
        required = False,
        )
    passport = ImageFile(
        title = u'Passport Photograph',
        #default = DEFAULT_PASSPORT_IMAGE_MALE,
        defaultFactory = default_passport_image,
        description = u'Maximun file size is 20 kB.',
        required = True,
        max_size = 20480,
        )

    #
    # Process Data
    #
    application_date = schema.Date(
        title = u'Application Date',
        required = False,
        readonly = True,
        )
    screening_score = schema.Int(
        title = u'Screening Score',
        required = False,
        )
    screening_venue = schema.TextLine(
        title = u'Screening Venue',
        required = False,
        )
    course_admitted = schema.Choice(
        title = u'Admitted Course of Study',
        source = CertificateSource(),
        default = None,
        required = False,
        )
    # entry_session is inherited from the container
    #entry_session = schema.Choice(
    #    source = entry_session_vocab,
    #    title = u'Entry Session',
    #    required = False,
    #    )
    notice = schema.Text(
        title = u'Notice',
        required = False,
        )
    student_id = schema.TextLine(
        title = u'Student ID',
        required = False,
        readonly = True,
        )
    locked = schema.Bool(
        title = u'Form locked',
        default = False,
        )

class IApplicant(IApplicantBaseData):
    """An applicant.

    This is basically the applicant base data. Here we repeat the
    fields from base data if we have to set the `required` attribute
    to True (which is the default).
    """

class IApplicantEdit(IApplicantBaseData):
    """An applicant.

    Here we can repeat the fields from base data and set the
    `required` and `readonly` attributes to True to further restrict
    the data access. We cannot omit fields. This has to be done in the
    respective form page.
    """
    screening_score = schema.Int(
        title = u'Screening Score',
        required = False,
        readonly = True,
        )
    screening_venue = schema.TextLine(
        title = u'Screening Venue',
        required = False,
        readonly = True,
        )
    course_admitted = schema.Choice(
        title = u'Admitted Course of Study',
        source = CertificateSource(),
        default = None,
        required = False,
        readonly = True,
        )
    # entry_session is inherited from the container
    #entry_session = schema.Choice(
    #    source = entry_session_vocab,
    #    title = u'Entry Session',
    #    required = False,
    #    readonly = True
    #    )
    notice = schema.Text(
        title = u'Notice',
        required = False,
        readonly = True,
        )

class IApplicantPrincipalInfo(IPrincipalInfo):
    """Infos about principals that are applicants.
    """
    access_code = Attribute("The Access Code the user purchased")

class IApplicantPrincipal(IPrincipal):
    """A principal that is an applicant.

    This interface extends zope.security.interfaces.IPrincipal and
    requires also an `id` and other attributes defined there.
    """
    access_code = schema.TextLine(
        title = u'Access Code',
        description = u'The access code purchased by the user.',
        required = True,
        readonly = True)

class IApplicantsFormChallenger(Interface):
    """A challenger that uses a browser form to collect applicant
       credentials.
    """
    loginpagename = schema.TextLine(
        title = u'Loginpagename',
        description = u"""Name of the login form used by challenger.

        The form must provide an ``access_code`` input field.
        """)

    accesscode_field = schema.TextLine(
        title = u'Access code field',
        description = u'''Field of the login page which is looked up for
                          access_code''',
        default = u'access_code',
        )


class IApplicantSessionCredentials(Interface):
    """Interface for storing and accessing applicant credentials in a
       session.
    """

    def __init__(access_code):
        """Create applicant session credentials."""

    def getAccessCode():
        """Return the access code."""


class IApplicantsContainerProvider(Interface):
    """A provider for applicants containers.

    Applicants container providers are meant to be looked up as
    utilities. This way we can find all applicant container types
    defined somewhere.

    Each applicants container provider registered as utility provides
    one container type and one should be able to call the `factory`
    attribute to create an instance of the requested container type.

    .. THE FOLLOWING SHOULD GO INTO SPHINX DOCS (and be tested)

    Samples
    *******

    Given, you had an IApplicantsContainer implementation somewhere
    and you would like to make it findable on request, then you would
    normally create an appropriate provider utility like this::

      import grok
      from waeup.sirp.applicants.interfaces import IApplicantsContainerProvider

      class MyContainerProvider(grok.GlobalUtility):
          grok.implements(IApplicantsContainerProvider)
          grok.name('MyContainerProvider') # Must be unique
          factory = MyContainer # A class implementing IApplicantsContainer
                                # or derivations thereof.

    This utility would be registered on startup and could then be used
    like this:

      >>> from zope.component import getAllUtilitiesRegisteredFor
      >>> from waeup.sirp.applicants.interfaces import (
      ...     IApplicantsContainerProvider)
      >>> all_providers = getAllUtilitiesRegisteredFor(
      ...     IApplicantsContainerProvider)
      >>> all_providers
      [<MyContainerProvider object at 0x...>]

    You could look up this specific provider by name:

      >>> from zope.component import getUtility
      >>> p = getUtility(IApplicantsContainerProvider, name='MyProvider')
      >>> p
      <MyContainerProvider object at 0x...>

    An applicants container would then be created like this:

      >>> provider = all_providers[0]
      >>> container = provider.factory()
      >>> container
      <MyContainer object at 0x...>

    """
    factory = Attribute("A class that can create instances of the "
                        "requested container type")