"""abstract action classes for CubicWeb web client

:organization: Logilab

:copyright: 2001-2010 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 cubicweb import target

from cubicweb.selectors import (partial_relation_possible, match_search_state,

                                one_line_rset, partial_may_add_relation, yes,

                                accepts_compat, condition_compat, deprecate)

from cubicweb.appobject import AppObject

class Action(AppObject):

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

    request search state.

    """

    __registry__ = 'actions'

    __select__ = match_search_state('normal')

    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 configurate actions

    category = 'moreactions'

    # actions in category 'moreactions' can specify a sub-menu in which they should be filed

    submenu = None

    def actual_actions(self):

        yield self

    def fill_menu(self, box, menu):

        """add action(s) to the given submenu of the given box"""

        for action in self.actual_actions():

            menu.append(box.box_action(action))

    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()

    def build_action(self, title, path, **kwargs):

        return UnregisteredAction(self.req, self.rset, title, path, **kwargs)

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

    """

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

                  & partial_relation_possible(action='add')

                  & partial_may_add_relation())

    registered = accepts_compat(Action.registered)

    submenu = '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('add/%s' % 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(condition_compat(accepts_compat(Action.registered)),

                           msg='EntityAction is deprecated, use Action with '

                           'appropriate selectors')