# copyright 2003-2010 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/>.

"""core CubicWeb schema, but not necessary at bootstrap time

"""

__docformat__ = "restructuredtext en"

_ = unicode

from yams.buildobjs import (EntityType, RelationType, SubjectRelation,

                            String, Datetime, Password)

from cubicweb.schema import (

    RQLConstraint, WorkflowableEntityType, ERQLExpression, RRQLExpression,

    PUB_SYSTEM_ENTITY_PERMS, PUB_SYSTEM_REL_PERMS, PUB_SYSTEM_ATTR_PERMS)

class CWUser(WorkflowableEntityType):

    """define a CubicWeb user"""

    __permissions__ = {

        'read':   ('managers', 'users', ERQLExpression('X identity U')),

        'add':    ('managers',),

        'delete': ('managers',),

        'update': ('managers', ERQLExpression('X identity U, NOT U in_group G, G name "guests"'),),

        }

    login     = String(required=True, unique=True, maxsize=64,

                       description=_('unique identifier used to connect to the application'))

    upassword = Password(required=True) # password is a reserved word for mysql

    firstname = String(maxsize=64)

    surname   = String(maxsize=64)

    last_login_time  = Datetime(description=_('last connection date'))

    # allowing an email to be the primary email of multiple entities is necessary for

    # test at least :-/

    primary_email = SubjectRelation('EmailAddress', cardinality='??',

                                    description=_('email address to use for notification'))

    use_email     = SubjectRelation('EmailAddress', cardinality='*?', composite='subject')

    in_group = SubjectRelation('CWGroup', cardinality='+*',

                               constraints=[RQLConstraint('NOT O name "owners"')],

                               description=_('groups grant permissions to the user'))

class EmailAddress(EntityType):

    """an electronic mail address associated to a short alias"""

    __permissions__ = {

        'read':   ('managers', 'users', 'guests',), # XXX if P use_email X, U has_read_permission P

        'add':    ('managers', 'users',),

        'delete': ('managers', 'owners', ERQLExpression('P use_email X, U has_update_permission P')),

        'update': ('managers', 'owners', ERQLExpression('P use_email X, U has_update_permission P')),

        }

    alias   = String(fulltextindexed=True, maxsize=56)

    address = String(required=True, fulltextindexed=True,

                     indexed=True, unique=True, maxsize=128)

    prefered_form = SubjectRelation('EmailAddress', cardinality='?*',

                                    description=_('when multiple addresses are equivalent \

(such as python-projects@logilab.org and python-projects@lists.logilab.org), set this \

to indicate which is the preferred form.'))

class use_email(RelationType):

    """ """

    __permissions__ = {

        'read':   ('managers', 'users', 'guests',),

        'add':    ('managers', RRQLExpression('U has_update_permission S'),),

        'delete': ('managers', RRQLExpression('U has_update_permission S'),),

        }

    fulltext_container = 'subject'

class primary_email(RelationType):

    """the prefered email"""

    __permissions__ = use_email.__permissions__

class prefered_form(RelationType):

    __permissions__ = {

        'read':   ('managers', 'users', 'guests',),

        # XXX should have update __permissions__ on both subject and object,

        #     though by doing this we will probably have no way to add

        #     this relation in the web ui. The easiest way to acheive this

        #     is probably to be able to have "U has_update_permission O" as

        #     RQLConstraint of the relation definition, though this is not yet

        #     possible

        'add':    ('managers', RRQLExpression('U has_update_permission S'),),

        'delete': ('managers', RRQLExpression('U has_update_permission S'),),

        }

class in_group(RelationType):

    """core relation indicating a user's groups"""

    __permissions__ = PUB_SYSTEM_REL_PERMS

class owned_by(RelationType):

    """core relation indicating owners of an entity. This relation

    implicitly put the owner into the owners group for the entity

    """

    __permissions__ = {

        'read':   ('managers', 'users', 'guests'),

        'add':    ('managers', RRQLExpression('S owned_by U'),),

        'delete': ('managers', RRQLExpression('S owned_by U'),),

        }

    # 0..n cardinality for entities created by internal session (no attached user)

    # and to support later deletion of a user which has created some entities

    cardinality = '**'

    subject = '*'

    object = 'CWUser'

class created_by(RelationType):

    """core relation indicating the original creator of an entity"""

    __permissions__ = {

        'read':   ('managers', 'users', 'guests'),

        'add':    ('managers',),

        'delete': ('managers',),

        }

    # 0..1 cardinality for entities created by internal session (no attached user)

    # and to support later deletion of a user which has created some entities

    cardinality = '?*'

    subject = '*'

    object = 'CWUser'

class creation_date(RelationType):

    """creation time of an entity"""

    __permissions__ = PUB_SYSTEM_ATTR_PERMS

    cardinality = '11'

    subject = '*'

    object = 'Datetime'

class modification_date(RelationType):

    """latest modification time of an entity"""

    __permissions__ = PUB_SYSTEM_ATTR_PERMS

    cardinality = '11'

    subject = '*'

    object = 'Datetime'

class cwuri(RelationType):

    """internal entity uri"""

    __permissions__ = PUB_SYSTEM_ATTR_PERMS

    cardinality = '11'

    subject = '*'

    object = 'String'

# XXX find a better relation name

class for_user(RelationType):

    """link a property to the user which want this property customization. Unless

    you're a site manager, this relation will be handled automatically.

    """

    __permissions__ = {

        'read':   ('managers', 'users', 'guests'),

        'add':    ('managers',),

        'delete': ('managers',),

        }

    inlined = True

    subject = 'CWProperty'

    object = 'CWUser'

    composite = 'object'

    cardinality = '?*'

class CWPermission(EntityType):

    """entity type that may be used to construct some advanced security configuration

    """

    __permissions__ = PUB_SYSTEM_ENTITY_PERMS

    name = String(required=True, indexed=True, internationalizable=True, maxsize=100,

                  description=_('name or identifier of the permission'))

    label = String(required=True, internationalizable=True, maxsize=100,

                   description=_('distinct label to distinguate between other '

                                 'permission entity of the same name'))

    require_group = SubjectRelation('CWGroup',

                                    description=_('groups to which the permission is granted'))

# explicitly add X require_permission CWPermission for each entity that should have

# configurable security

class require_permission(RelationType):

    """link a permission to the entity. This permission should be used in the

    security definition of the entity's type to be useful.

    """

    __permissions__ = PUB_SYSTEM_REL_PERMS

class require_group(RelationType):

    """used to grant a permission to a group"""

    __permissions__ = PUB_SYSTEM_REL_PERMS

class ExternalUri(EntityType):

    """a URI representing an object in external data store"""

    uri = String(required=True, unique=True, maxsize=256,

                 description=_('the URI of the object'))

class same_as(RelationType):

    """generic relation to specify that an external entity represent the same

    object as a local one:

       http://www.w3.org/TR/owl-ref/#sameAs-def

    """

    #NOTE: You'll have to explicitly declare which entity types can have a

    #same_as relation

    __permissions__ = {

        'read':   ('managers', 'users', 'guests',),

        'add':    ('managers', 'users'),

        'delete': ('managers', 'owners'),

        }

    cardinality = '**'

    symmetric = True

    # NOTE: the 'object = ExternalUri' declaration will still be mandatory

    #       in the cube's schema.

    object = 'ExternalUri'

class CWCache(EntityType):

    """a simple cache entity characterized by a name and

    a validity date.

    The target application is responsible for updating timestamp

    when necessary to invalidate the cache (typically in hooks).

    Also, checkout the AppObject.get_cache() method.

    """

    # XXX only handle by hooks, shouldn't be readable/editable at all through

    # the ui and so no permissions should be granted, no?

    __permissions__ = {

        'read':   ('managers', 'users', 'guests'),

        'add':    ('managers',),

        'update': ('managers', 'users',), # XXX

        'delete': ('managers',),

        }

    name = String(required=True, unique=True, indexed=True,  maxsize=128,

                  description=_('name of the cache'))

    timestamp = Datetime(default='NOW')

# "abtract" relation types, not used in cubicweb itself

class identical_to(RelationType):

    """identical to"""

    symmetric = True

    __permissions__ = {

        'read':   ('managers', 'users', 'guests',),

        # XXX should have update __permissions__ on both subject and object,

        #     though by doing this we will probably have no way to add

        #     this relation in the web ui. The easiest way to acheive this

        #     is probably to be able to have "U has_update_permission O" as

        #     RQLConstraint of the relation definition, though this is not yet

        #     possible

        'add':    ('managers', RRQLExpression('U has_update_permission S'),),

        'delete': ('managers', RRQLExpression('U has_update_permission S'),),

        }

class see_also(RelationType):

    """generic relation to link one entity to another"""

    symmetric = True

    __permissions__ = {

        'read':   ('managers', 'users', 'guests',),

        'add':    ('managers', RRQLExpression('U has_update_permission S'),),

        'delete': ('managers', RRQLExpression('U has_update_permission S'),),

        }