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

: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"

_ = unicode

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

                            String, Boolean, Datetime, Password)

from cubicweb.schema import (RQLConstraint, WorkflowableEntityType,

                             ERQLExpression, RRQLExpression)

from cubicweb.schemas import META_ETYPE_PERMS, META_RTYPE_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)

    canonical = Boolean(default=False,

                        description=_('when multiple addresses are equivalent \

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

to true on one of them which is the preferred form.'))

    identical_to = SubjectRelation('EmailAddress')

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 identical_to(RelationType):

    """identical_to"""

    symetric = 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 in_group(RelationType):

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

    permissions = META_RTYPE_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"""

    cardinality = '11'

    subject = '**'

    object = 'Datetime'

class modification_date(RelationType):

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

    cardinality = '11'

    subject = '**'

    object = 'Datetime'

class CWProperty(EntityType):

    """used for cubicweb configuration. Once a property has been created you

    can't change the key.

    """

    permissions = {

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

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

        'update': ('managers', 'owners',),

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

        }

    # key is a reserved word for mysql

    pkey = String(required=True, internationalizable=True, maxsize=256,

                  description=_('defines what\'s the property is applied for. '

                                'You must select this first to be able to set '

                                'value'))

    value = String(internationalizable=True, maxsize=256)

    for_user = SubjectRelation('CWUser', cardinality='?*', composite='object',

                               description=_('user for which this property is '

                                             'applying. If this relation is not '

                                             'set, the property is considered as'

                                             ' a global property'))

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

class CWPermission(EntityType):

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

    """

    permissions = META_ETYPE_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 = {

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

        'add':    ('managers',),

        'delete': ('managers',),

        }

class require_group(RelationType):

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

    permissions = {

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

        'add':    ('managers',),

        'delete': ('managers',),

        }

class see_also(RelationType):

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

    symetric = True

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 AppRsetObject.get_cache() method.

    """

    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')