# copyright 2003-2012 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/>.

"""Set of HTML base actions"""

__docformat__ = "restructuredtext en"

_ = unicode

from warnings import warn

from logilab.mtconverter import xml_escape

from logilab.common.registry import objectify_predicate, yes

from cubicweb.schema import display_name

from cubicweb.predicates import (EntityPredicate,

    one_line_rset, multi_lines_rset, one_etype_rset, relation_possible,

    nonempty_rset, non_final_entity, score_entity,

    authenticated_user, match_user_groups, match_search_state,

    has_permission, has_add_permission, is_instance, debug_mode,

    )

from cubicweb.web import controller, action

from cubicweb.web.views import uicfg, linksearch_select_url, vid_from_rset

class has_editable_relation(EntityPredicate):

    """accept if some relations for an entity found in the result set is

    editable by the logged user.

    See `EntityPredicate` documentation for behaviour when row is not specified.

    """

    def score_entity(self, entity):

        # if user has no update right but it can modify some relation,

        # display action anyway

        form = entity._cw.vreg['forms'].select('edition', entity._cw,

                                               entity=entity, mainform=False)

        for dummy in form.editable_relations():

            return 1

        editableattrs = form.editable_attributes(strict=True)

        for rschema, role in editableattrs:

            return 1

        return 0

@objectify_predicate

def match_searched_etype(cls, req, rset=None, **kwargs):

    return req.match_search_state(rset)

@objectify_predicate

def view_is_not_default_view(cls, req, rset=None, **kwargs):

    # interesting if it propose another view than the current one

    vid = req.form.get('vid')

    if vid and vid != vid_from_rset(req, rset, req.vreg.schema):

        return 1

    return 0

@objectify_predicate

def addable_etype_empty_rset(cls, req, rset=None, **kwargs):

    if rset is not None and not rset.rowcount:

        rqlst = rset.syntax_tree()

        if len(rqlst.children) > 1:

            return 0

        select = rqlst.children[0]

        if len(select.defined_vars) == 1 and len(select.solutions) == 1:

            rset._searched_etype = select.solutions[0].itervalues().next()

            eschema = req.vreg.schema.eschema(rset._searched_etype)

            if not (eschema.final or eschema.is_subobject(strict=True)) \

                   and eschema.has_perm(req, 'add'):

                return 1

    return 0

class has_undoable_transactions(EntityPredicate):

    "Select entities having public (i.e. end-user) undoable transactions."

    def score_entity(self, entity):

        if not entity._cw.vreg.config['undo-enabled']:

            return 0

        if entity._cw.cnx.undoable_transactions(eid=entity.eid):

            return 1

        else:

            return 0

# generic 'main' actions #######################################################

class SelectAction(action.Action):

    """base class for link search actions. By default apply on

    any size entity result search it the current state is 'linksearch'

    if accept match.

    """

    __regid__ = 'select'

    __select__ = (match_search_state('linksearch') & nonempty_rset()

                  & match_searched_etype())

    title = _('select')

    category = 'mainactions'

    order = 0

    def url(self):

        return linksearch_select_url(self._cw, self.cw_rset)

class CancelSelectAction(action.Action):

    __regid__ = 'cancel'

    __select__ = match_search_state('linksearch')

    title = _('cancel select')

    category = 'mainactions'

    order = 10

    def url(self):

        target, eid, r_type, searched_type = self._cw.search_state[1]

        return self._cw.build_url(str(eid),

                                  vid='edition', __mode='normal')

class ViewAction(action.Action):

    __regid__ = 'view'

    __select__ = (action.Action.__select__ &

                  match_user_groups('users', 'managers') &

                  view_is_not_default_view() &

                  non_final_entity())

    title = _('view')

    category = 'mainactions'

    order = 0

    def url(self):

        params = self._cw.form.copy()

        for param in ('vid', '__message') + controller.NAV_FORM_PARAMETERS:

            params.pop(param, None)

        if self._cw.ajax_request:

            path = 'view'

            if self.cw_rset is not None:

                params = {'rql': self.cw_rset.printable_rql()}

        else:

            path = self._cw.relative_path(includeparams=False)

        return self._cw.build_url(path, **params)

class ModifyAction(action.Action):

    __regid__ = 'edit'

    __select__ = (action.Action.__select__

                  & one_line_rset() & has_editable_relation())

    title = _('modify')

    category = 'mainactions'

    order = 10

    def url(self):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        return entity.absolute_url(vid='edition')

class MultipleEditAction(action.Action):

    __regid__ = 'muledit' # XXX get strange conflicts if id='edit'

    __select__ = (action.Action.__select__ & multi_lines_rset() &

                  one_etype_rset() & has_permission('update'))

    title = _('modify')

    category = 'mainactions'

    order = 10

    def url(self):

        return self._cw.build_url('view', rql=self.cw_rset.printable_rql(), vid='muledit')

# generic "more" actions #######################################################

class ManagePermissionsAction(action.Action):

    __regid__ = 'managepermission'

    __select__ = (action.Action.__select__ & one_line_rset() &

                  non_final_entity() & match_user_groups('managers'))

    title = _('manage permissions')

    category = 'moreactions'

    order = 15

    def url(self):

        return self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0).absolute_url(vid='security')

class DeleteAction(action.Action):

    __regid__ = 'delete'

    __select__ = action.Action.__select__ & has_permission('delete')

    title = _('delete')

    category = 'moreactions'

    order = 20

    def url(self):

        if len(self.cw_rset) == 1:

            entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

            return self._cw.build_url(entity.rest_path(), vid='deleteconf')

        return self._cw.build_url(rql=self.cw_rset.printable_rql(), vid='deleteconf')

class CopyAction(action.Action):

    __regid__ = 'copy'

    __select__ = (action.Action.__select__ & one_line_rset()

                  & has_permission('add'))

    title = _('copy')

    category = 'moreactions'

    order = 30

    def url(self):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        return entity.absolute_url(vid='copy')

class AddNewAction(MultipleEditAction):

    """when we're seeing more than one entity with the same type, propose to

    add a new one

    """

    __regid__ = 'addentity'

    __select__ = (action.Action.__select__ &

                  (addable_etype_empty_rset()

                   | (multi_lines_rset() & one_etype_rset() & has_add_permission()))

                  )

    category = 'moreactions'

    order = 40

    @property

    def rsettype(self):

        if self.cw_rset:

            return self.cw_rset.description[0][0]

        return self.cw_rset._searched_etype

    @property

    def title(self):

        return self._cw.__('add a %s' % self.rsettype) # generated msgid

    def url(self):

        return self._cw.vreg["etypes"].etype_class(self.rsettype).cw_create_url(self._cw)

class AddRelatedActions(action.Action):

    """fill 'addrelated' sub-menu of the actions box"""

    __regid__ = 'addrelated'

    __select__ = action.Action.__select__ & one_line_rset() & non_final_entity()

    submenu = _('addrelated')

    order = 17

    def fill_menu(self, box, menu):

        # when there is only one item in the sub-menu, replace the sub-menu by

        # item's title prefixed by 'add'

        menu.label_prefix = self._cw._('add')

        super(AddRelatedActions, self).fill_menu(box, menu)

    def redirect_params(self, entity):

        return {'__redirectpath': entity.rest_path(), # should not be url quoted!

                '__redirectvid': self._cw.form.get('vid', '')}

    def actual_actions(self):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        eschema = entity.e_schema

        params = self.redirect_params(entity)

        for rschema, teschema, role in self.add_related_schemas(entity):

            if rschema.role_rdef(eschema, teschema, role).role_cardinality(role) in '1?':

                if entity.related(rschema, role):

                    continue

            if role == 'subject':

                label = 'add %s %s %s %s' % (eschema, rschema, teschema, role)

                url = self.linkto_url(entity, rschema, teschema, 'object', **params)

            else:

                label = 'add %s %s %s %s' % (teschema, rschema, eschema, role)

                url = self.linkto_url(entity, rschema, teschema, 'subject', **params)

            yield self.build_action(self._cw._(label), url)

    def add_related_schemas(self, entity):

        """this is actually used ui method to generate 'addrelated' actions from

        the schema.

        If you don't want any auto-generated actions, you should overrides this

        method to return an empty list. If you only want some, you can configure

        them by using uicfg.actionbox_appearsin_addmenu

        """

        appearsin_addmenu = self._cw.vreg['uicfg'].select(

            'actionbox_appearsin_addmenu', self._cw, entity=entity)

        req = self._cw

        eschema = entity.e_schema

        for role, rschemas in (('subject', eschema.subject_relations()),

                               ('object', eschema.object_relations())):

            for rschema in rschemas:

                if rschema.final:

                    continue

                for teschema in rschema.targets(eschema, role):

                    if not appearsin_addmenu.etype_get(eschema, rschema,

                                                       role, teschema):

                        continue

                    rdef = rschema.role_rdef(eschema, teschema, role)

                    # check the relation can be added

                    # XXX consider autoform_permissions_overrides?

                    if role == 'subject'and not rdef.has_perm(

                        req, 'add', fromeid=entity.eid):

                        continue

                    if role == 'object'and not rdef.has_perm(

                        req, 'add', toeid=entity.eid):

                        continue

                    # check the target types can be added as well

                    if teschema.may_have_permission('add', req):

                        yield rschema, teschema, role

    def linkto_url(self, entity, rtype, etype, target, **kwargs):

        return self._cw.vreg["etypes"].etype_class(etype).cw_create_url(

                self._cw, __linkto='%s:%s:%s' % (rtype, entity.eid, target),

                **kwargs)

class ViewSameCWEType(action.Action):

    """when displaying the schema of a CWEType, offer to list entities of that type

    """

    __regid__ = 'entitiesoftype'

    __select__ = one_line_rset() & is_instance('CWEType') & score_entity(lambda x: not x.final)

    category = 'mainactions'

    order = 40

    @property

    def etype(self):

        return self.cw_rset.get_entity(0,0).name

    @property

    def title(self):

        return self._cw.__('view all %s') % display_name(self._cw, self.etype, 'plural').lower()

    def url(self):

        return self._cw.build_url(self.etype)

# logged user actions #########################################################

class UserPreferencesAction(action.Action):

    __regid__ = 'myprefs'

    __select__ = authenticated_user()

    title = _('user preferences')

    category = 'useractions'

    order = 10

    def url(self):

        return self._cw.build_url(self.__regid__)

class UserInfoAction(action.Action):

    __regid__ = 'myinfos'

    __select__ = authenticated_user()

    title = _('profile')

    category = 'useractions'

    order = 20

    def url(self):

        return self._cw.build_url('cwuser/%s'%self._cw.user.login, vid='edition')