# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""entity classes user and group entities"""

__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 grant_permission(self, entity, pname, plabel=None):

        """grant local `pname` permission on `entity` to this group using

        :class:`CWPermission`.

        If a similar permission already exists, add the group to it, else create

        a new one.

        """

        if not self._cw.execute(

            'SET X require_group G WHERE E eid %(e)s, G eid %(g)s, '

            'E require_permission X, X name %(name)s, X label %(label)s',

            {'e': entity.eid, 'g': self.eid,

             'name': pname, 'label': plabel}):

            self._cw.create_entity('CWPermission', name=pname, label=plabel,

                                   require_group=self,

                                   reverse_require_permission=entity)

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 set_property(self, pkey, value):

        value = unicode(value)

        try:

            prop = self._cw.execute(

                'CWProperty X WHERE X pkey %(k)s, X for_user U, U eid %(u)s',

                {'k': pkey, 'u': self.eid}).get_entity(0, 0)

        except Exception:

            kwargs = dict(pkey=unicode(pkey), value=value)

            if self.is_in_group('managers'):

                kwargs['for_user'] = self

            self._cw.create_entity('CWProperty', **kwargs)

        else:

            prop.set_attributes(value=value)

    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) # XXX return the resulting set instead of its size

    def is_in_group(self, group):

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

        """

        return group in self.groups

    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):

        try:

            return self._cw.execute(

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

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

        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}

        if contexteid is not None:

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

            kwargs['x'] = contexteid

        try:

            return self._cw.execute(rql, kwargs)

        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

from logilab.common.deprecation import class_renamed

EUser = class_renamed('EUser', CWUser)

EGroup = class_renamed('EGroup', CWGroup)