"""abstract action classes for CubicWeb web client

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from cubicweb import role, target

from cubicweb.vregistry import objectify_selector

from cubicweb.selectors import (relation_possible, match_search_state,

                                one_line_rset, may_add_relation, yes,

                                accepts_compat, condition_compat, deprecate)

from cubicweb.appobject import AppRsetObject

from cubicweb.common.registerers import accepts_registerer

_ = unicode

class Action(AppRsetObject):

    """abstract action. Handle the .search_states attribute to match

    request search state. 

    """

    __registry__ = 'actions'

    __registerer__ = accepts_registerer

    __select__ = yes()

    property_defs = {

        'visible':  dict(type='Boolean', default=True,

                         help=_('display the action or not')),

        'order':    dict(type='Int', default=99,

                         help=_('display order of the action')),

        'category': dict(type='String', default='moreactions',

                         vocabulary=('mainactions', 'moreactions', 'addrelated',

                                     'useractions', 'siteactions', 'hidden'),

                         help=_('context where this component should be displayed')),

    }

    site_wide = True # don't want user to configuration actions eproperties

    category = 'moreactions'

    def url(self):

        """return the url associated with this action"""

        raise NotImplementedError

    def html_class(self):

        if self.req.selected(self.url()):

            return 'selected'

        if self.category:

            return 'box' + self.category.capitalize()

class UnregisteredAction(Action):

    """non registered action used to build boxes. Unless you set them

    explicitly, .vreg and .schema attributes at least are None.

    """

    category = None

    id = None

    def __init__(self, req, rset, title, path, **kwargs):

        Action.__init__(self, req, rset)

        self.title = req._(title)

        self._path = path

        self.__dict__.update(kwargs)

    def url(self):

        return self._path

class LinkToEntityAction(Action):

    """base class for actions consisting to create a new object

    with an initial relation set to an entity.

    Additionaly to EntityAction behaviour, this class is parametrized

    using .etype, .rtype and .target attributes to check if the

    action apply and if the logged user has access to it

    """

    @objectify_selector

    def my_selector(cls, req, rset, row=None, col=0, **kwargs):

        selector = (match_search_state('normal') & one_line_rset()

                    & relation_possible(cls.rtype, role(cls), cls.etype,

                                        action='add')

                    & may_add_relation(cls.rtype, role(cls)))

        return selector(cls, req, rset, row, col, **kwargs)

    __select__ = my_selector()

    category = 'addrelated'

    def url(self):

        current_entity = self.rset.get_entity(self.row or 0, self.col or 0)

        linkto = '%s:%s:%s' % (self.rtype, current_entity.eid, target(self))

        return self.build_url(vid='creation', etype=self.etype,

                              __linkto=linkto,

                              __redirectpath=current_entity.rest_path(), # should not be url quoted!

                              __redirectvid=self.req.form.get('__redirectvid', ''))

class EntityAction(Action):

    """DEPRECATED / BACKWARD COMPAT

    """

    registered = deprecate(accepts_compat(condition_compat(Action.registered)),

                           msg='EntityAction is deprecated, use Action with '

                           'appropriate selectors')