"""entity classes user and group entities

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

from logilab.common.decorators import cached

from cubicweb import Unauthorized

from cubicweb.entities import AnyEntity, fetch_config

class CWGroup(AnyEntity):

    __regid__ = 'CWGroup'

    fetch_attrs, fetch_order = fetch_config(['name'])

    fetch_unrelated_order = fetch_order

    def db_key_name(self):

        """XXX goa specific"""

        return self.get('name')

class CWUser(AnyEntity):

    __regid__ = 'CWUser'

    fetch_attrs, fetch_order = fetch_config(['login', 'firstname', 'surname'])

    fetch_unrelated_order = fetch_order

    # used by repository to check if  the user can log in or not

    AUTHENTICABLE_STATES = ('activated',)

    # low level utilities #####################################################

    def __init__(self, *args, **kwargs):

        groups = kwargs.pop('groups', None)

        properties = kwargs.pop('properties', None)

        super(CWUser, self).__init__(*args, **kwargs)

        if groups is not None:

            self._groups = groups

        if properties is not None:

            self._properties = properties

    @property

    def groups(self):

        try:

            return self._groups

        except AttributeError:

            self._groups = set(g.name for g in self.in_group)

            return self._groups

    @property

    def properties(self):

        try:

            return self._properties

        except AttributeError:

            self._properties = dict((p.pkey, p.value) for p in self.reverse_for_user)

            return self._properties

    def property_value(self, key):

        try:

            # properties stored on the user aren't correctly typed

            # (e.g. all values are unicode string)

            return self._cw.vreg.typed_value(key, self.properties[key])

        except KeyError:

            pass

        except ValueError:

            self.warning('incorrect value for eproperty %s of user %s',

                         key, self.login)

        return self._cw.vreg.property_value(key)

    def matching_groups(self, groups):

        """return the number of the given group(s) in which the user is

        :type groups: str or iterable(str)

        :param groups: a group name or an iterable on group names

        """

        if isinstance(groups, basestring):

            groups = frozenset((groups,))

        elif isinstance(groups, (tuple, list)):

            groups = frozenset(groups)

        return len(groups & self.groups)

    def is_in_group(self, group):

        """convience / shortcut method to test if the user belongs to `group`

        """

        return self.matching_groups(group) == 1

    def is_anonymous(self):

        """ checks if user is an anonymous user"""

        #FIXME on the web-side anonymous user is detected according

        # to config['anonymous-user'], we don't have this info on

        # the server side.

        return self.groups == frozenset(('guests', ))

    def owns(self, eid):

        if hasattr(self._cw, 'unsafe_execute'):

            # use unsafe_execute on the repository side, in case

            # session's user doesn't have access to CWUser

            execute = self._cw.unsafe_execute

        else:

            execute = self._cw.execute

        try:

            return execute('Any X WHERE X eid %(x)s, X owned_by U, U eid %(u)s',

                           {'x': eid, 'u': self.eid}, 'x')

        except Unauthorized:

            return False

    owns = cached(owns, keyarg=1)

    def has_permission(self, pname, contexteid=None):

        rql = 'Any P WHERE P is CWPermission, U eid %(u)s, U in_group G, '\

              'P name %(pname)s, P require_group G'

        kwargs = {'pname': pname, 'u': self.eid}

        cachekey = None

        if contexteid is not None:

            rql += ', X require_permission P, X eid %(x)s'

            kwargs['x'] = contexteid

            cachekey = 'x'

        try:

            return self._cw.execute(rql, kwargs, cachekey)

        except Unauthorized:

            return False

    # presentation utilities ##################################################

    def name(self):

        """construct a name using firstname / surname or login if not defined"""

        if self.firstname and self.surname:

            return self._cw._('%(firstname)s %(surname)s') % {

                'firstname': self.firstname, 'surname' : self.surname}

        if self.firstname:

            return self.firstname

        return self.login

    def dc_title(self):

        return self.login

    dc_long_title = name

    def db_key_name(self):

        """XXX goa specific"""

        return self.get('login')

from logilab.common.deprecation import class_renamed

EUser = class_renamed('EUser', CWUser)

EGroup = class_renamed('EGroup', CWGroup)