#
#  Copyright (c) 2010 Helmut Merz helmutm@cy55.de
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program 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 General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
View class for Node objects.

$Id$
"""

from urlparse import urlparse, urlunparse
from zope import component, interface, schema
from zope.cachedescriptors.property import Lazy
from zope.app import zapi
from zope.annotation.interfaces import IAnnotations
from zope.app.catalog.interfaces import ICatalog
from zope.app.container.browser.contents import JustContents
from zope.app.container.browser.adding import Adding
from zope.app.container.traversal import ItemTraverser
from zope.app.pagetemplate import ViewPageTemplateFile
from zope.app.security.interfaces import IUnauthenticatedPrincipal
from zope.dottedname.resolve import resolve
from zope.event import notify
from zope.lifecycleevent import ObjectCreatedEvent, ObjectModifiedEvent
from zope.lifecycleevent import Attributes
from zope.formlib.form import Form, FormFields
from zope.proxy import removeAllProxies
from zope.security import canAccess, canWrite, checkPermission
from zope.security.proxy import removeSecurityProxy

from cybertools.ajax import innerHtml
from cybertools.browser import configurator
from cybertools.browser.action import Action
from cybertools.browser.view import GenericView
from cybertools.stateful.interfaces import IStateful
from cybertools.typology.interfaces import IType, ITypeManager
from cybertools.xedit.browser import ExternalEditorView
from loops.browser.action import actions, DialogAction
from loops.common import adapted, AdapterBase
from loops.i18n.browser import i18n_macros
from loops.interfaces import IConcept, IResource, IDocument, IMediaAsset, INode
from loops.interfaces import IViewConfiguratorSchema
from loops.resource import MediaAsset
from loops import util
from loops.util import _
from loops.browser.common import BaseView
from loops.browser.concept import ConceptView
from loops.organize.interfaces import IPresence
from loops.organize.tracking import access
from loops.versioning.util import getVersion


node_macros = ViewPageTemplateFile('node_macros.pt')
info_macros = ViewPageTemplateFile('info.pt')
calendar_macros = ViewPageTemplateFile('calendar.pt')


class NodeView(BaseView):

    _itemNum = 0
    template = node_macros
    nextUrl = None

    def __init__(self, context, request):
        super(NodeView, self).__init__(context, request)
        self.viewAnnotations.setdefault('nodeView', self)
        self.viewAnnotations.setdefault('node', self.context)
        viewConfig = getViewConfiguration(context, request)
        self.setSkin(viewConfig.get('skinName'))

    @Lazy
    def macro(self):
        return self.template.macros['content']

    def update(self):
        result = super(NodeView, self).update()
        self.recordAccess()
        return result

    def recordAccess(self, viewName=''):
        target = self.virtualTargetObject
        targetUid = target is not None and util.getUidForObject(target) or ''
        access.record(self.request, principal=self.principalId,
                                    node=self.uniqueId,
                                    target=targetUid,
                                    view=viewName)

    def setupController(self):
        cm = self.controller.macros
        cm.register('css', identifier='loops.css', resourceName='loops.css',
                    media='all', priority=60)
        cm.register('js', 'loops.js', resourceName='loops.js', priority=60)
        cm.register('top_actions', 'top_actions', name='multi_actions',
                    subMacros=[i18n_macros.macros['language_switch']])
        if self.globalOptions('expert.quicksearch'):
            from loops.expert.browser.search import searchMacrosTemplate
            cm.register('top_actions', 'top_quicksearch', name='multi_actions',
                        subMacros=[searchMacrosTemplate.macros['quicksearch']],
                        priority=20)
        cm.register('portlet_left', 'navigation', title='Navigation',
                    subMacro=node_macros.macros['menu'])
        if canWrite(self.context, 'title') or (
                # TODO: is this useful in any case?
                self.virtualTargetObject is not None and
                    canWrite(self.virtualTargetObject, 'title')):
            cm.register('portlet_right', 'actions', title=_(u'Actions'),
                        subMacro=node_macros.macros['actions'],
                        priority=100)
        if not IUnauthenticatedPrincipal.providedBy(self.request.principal):
            mi = self.controller.memberInfo
            title = mi.title.value or _(u'Personal Informations')
            url=None
            obj = mi.get('object')
            if obj is not None:
                query = self.conceptManager.get('personal_info')
                if query is None:
                    #url = self.url + '/personal_info.html'
                    url = self.getUrlForTarget(obj.value)
                else:
                    url = self.getUrlForTarget(query)
            cm.register('portlet_right', 'personal', title=title,
                        subMacro=node_macros.macros['personal'],
                        icon='cybertools.icons/user.png',
                        url=url,
                        priority=10)
            if self.globalOptions('organize.showPresence'):
                cm.register('portlet_right', 'presence', title=_(u'Presence'),
                            subMacro=node_macros.macros['presence'],
                            icon='cybertools.icons/group.png',
                            priority=11)
        if self.globalOptions('organize.showCalendar'):
            cm.register('portlet_left', 'calendar', title=_(u'Calendar'),
                        subMacro=calendar_macros.macros['main'],
                        priority=90)
        # force early portlet registrations by target by setting up target view
        self.virtualTarget

    @Lazy
    def usersPresent(self):
        presence = component.getUtility(IPresence)
        presence.update(self.request.principal.id)
        data = presence.getPresentUsers(self.context)
        for u in data:
            if IConcept.providedBy(u):
                url = self.getUrlForTarget(u)
            else:
                url = None
            yield dict(title=u.title, url=url)

    @Lazy
    def view(self):
        name = self.request.get('loops.viewName', '') or self.context.viewName
        if name and '?' in name:
            name, params = name.split('?', 1)
            ann = self.request.annotations.get('loops.view', {})
            ann['params'] = params
            self.request.annotations['loops.view'] = ann
        if name:
            adapter = component.queryMultiAdapter(
                            (self.context, self.request), name=name)
            if adapter is not None:
                return adapter
        return self

    @Lazy
    def item(self):
        viewName = self.request.get('loops.viewName') or ''
        # was there a .target... element in the URL?
        #target = self.virtualTargetObject  # ignores page even for direktly assignd target
        target = self.request.annotations.get('loops.view', {}).get('target')
        if target is not None:
            basicView = component.getMultiAdapter((target, self.request), name=viewName)
            # xxx: obsolete when self.targetObject is virtual target:
            if hasattr(basicView, 'view'):
                #basicView.setupController()
                return basicView.view
        return self.page

    @Lazy
    def page(self):
        page = self.context.getPage()
        return page is not None and NodeView(page, self.request).view or None

    @Lazy
    def textItems(self):
        return [NodeView(child, self.request)
                    for child in self.context.getTextItems()]

    @Lazy
    def pageItems(self):
        return [NodeView(child, self.request)
                    for child in self.context.getPageItems()]

    @property
    def itemNum(self):
        self._itemNum += 1
        return self._itemNum

    @Lazy
    def nodeType(self):
        return self.context.nodeType

    def render(self, text=None):
        if text is None:
            text = self.context.body
        if not text:
            return u''
        if text.startswith('<'):  # seems to be HTML
            return text
        source = zapi.createObject(self.context.contentType, text)
        view = component.getMultiAdapter((removeAllProxies(source), self.request))
        return view.render()

    @Lazy
    def targetObject(self):
        # xxx: use virtualTargetObject
        #return self.virtualTargetObject
        target = self.context.target
        if target is not None:
            target = getVersion(target, self.request)
        return target

    @Lazy
    def targetObjectView(self):
        obj = self.targetObject
        if obj is not None:
            basicView = component.getMultiAdapter((obj, self.request))
            basicView._viewName = self.context.viewName
            if self.context.nodeType != 'text':
                basicView.setupController()
            return basicView.view

    @Lazy
    def targetUrl(self):
        t = self.targetObjectView
        if t is not None:
            #return '%s/.target%s' % (self.url, t.uniqueId)
            return '%s/.%s' % (self.url, t.uniqueId)
        return ''

    def renderTarget(self):
        target = self.targetObjectView
        return target is not None and target.render() or u''

    @Lazy
    def body(self):
        return self.render()

    @Lazy
    def bodyMacro(self):
        # TODO: replace by something like: return self.target.macroName
        target = self.targetObject
        if (target is None or IDocument.providedBy(target)
                or (IResource.providedBy(target) and
                    target.contentType.startswith('text/'))):
            return 'textbody'
        if IConcept.providedBy(target):
            return 'conceptbody'
        if IResource.providedBy(target) and target.contentType.startswith('image/'):
            return 'imagebody'
        return 'filebody'

    @Lazy
    def editable(self):
        return canWrite(self.context, 'body')

    # menu stuff

    @Lazy
    def menuObject(self):
        return self.context.getMenu()

    @Lazy
    def menu(self):
        menu = self.menuObject
        return menu is not None and NodeView(menu, self.request) or None

    @Lazy
    def topMenu(self):
        menu = self.menuObject
        parentMenu = None
        while menu is not None:
            parent = zapi.getParent(menu)
            if INode.providedBy(parent):
                parentMenu = parent.getMenu()
            if parentMenu is None or parentMenu is menu:
                return NodeView(menu, self.request)
            menu = parentMenu
        return menu is not None and NodeView(menu, self.request) or None

    @Lazy
    def headTitle(self):
        menuObject = self.menuObject
        if menuObject is not None and (menuObject != self.context or
                                       self.virtualTarget):
            prefix = super(NodeView, self.menu).headTitle + ' - '
        else:
            prefix = ''
        if self.virtualTarget:
            return prefix + self.virtualTarget.headTitle
        return prefix + super(NodeView, self).headTitle

    @Lazy
    def menuItems(self):
        return [NodeView(child, self.request)
                    for child in self.context.getMenuItems()]

    @Lazy
    def parents(self):
        return zapi.getParents(self.context)

    @Lazy
    def nearestMenuItem(self):
        menu = self.menuObject
        menuItem = None
        for p in [self.context] + self.parents:
            if not p.isMenuItem():
                menuItem = None
            elif menuItem is None:
                menuItem = p
            if p == menu:
                return menuItem
        return None

    def selected(self, item):
        return item.context == self.nearestMenuItem

    def active(self, item):
        return item.context == self.context or item.context in self.parents

    # virtual target support

    @Lazy
    def virtualTargetObject(self):
        target = self.request.annotations.get('loops.view', {}).get('target')
        if target is None:
            target = self.context.target
            if target is not None:
                target = getVersion(target, self.request)
        return target

    target = virtualTargetObject

    @Lazy
    def targetUid(self):
        if self.virtualTargetObject:
            return util.getUidForObject(self.virtualTargetObject)
        else:
            return None

    def targetView(self, name='index.html', methodName='show'):
        if '?' in name:
            name, params = name.split('?', 1)
        target = self.virtualTargetObject
        if target is not None:
            if isinstance(target, AdapterBase):
                target = target.context
            targetView = component.queryMultiAdapter(
                                (adapted(target), self.request), name=name)
            if targetView is None:
                targetView = component.getMultiAdapter(
                                (target, self.request), name=name)
            if name == 'index.html' and hasattr(targetView, 'show'):
                return targetView.show()
            method = getattr(targetView, methodName, None)
            if method:
                return method()
            return targetView()
        return u''

    def targetDefaultView(self):
        target = self.virtualTargetObject
        if target is not None:
            # zope.app.publisher.browser
            name = zapi.getDefaultViewName(target, self.request)
            return self.targetView(name)
        return u''

    def targetDownload(self):
        return self.targetView('download.html', 'download')

    def targetRender(self):
        return u'<div>%s</div>' % self.targetView('download.html', 'show')

    @Lazy
    def virtualTarget(self):
        obj = self.virtualTargetObject
        if obj is not None:
            basicView = component.getMultiAdapter((obj, self.request))
            if obj == self.targetObject:
                basicView._viewName = self.context.viewName
            #if self.context.nodeType != 'text':
            basicView.setupController()
            if hasattr(basicView, 'view'):
                return basicView.view

    @Lazy
    def targetId(self):
        target = self.virtualTargetObject
        if target is not None:
            return BaseView(target, self.request).uniqueId

    @Lazy
    def virtualTargetUrl(self):
        targetId = self.targetId
        if targetId is not None:
            #return '%s/.target%s' % (self.url, targetId)
            return '%s/.%s' % (self.url, targetId)
        else:
            return self.url

    @Lazy
    def virtualTargetUrlWithSkin(self):
        url = self.virtualTargetUrl
        if self.skin:
            parts = urlparse(url)
            url = urlunparse(parts[:2] +
                             ('/++skin++' + self.skin.__name__ + parts[2],) +
                             parts[3:])
        return url

    @Lazy
    def realTargetUrl(self):
        target = self.virtualTargetObject
        if target is not None:
            return BaseView(target, self.request).url

    # target viewing and editing support

    def getUrlForTarget(self, target):
        """ Return URL of given target view given as .XXX URL.
        """
        if isinstance(target, BaseView):
            #return '%s/.target%s' % (self.url, target.uniqueId)
            return '%s/.%s' % (self.url, target.uniqueId)
        else:
            #return ('%s/.target%s' %
            return ('%s/.%s' %
                (self.url, util.getUidForObject(target)))

    def getActions(self, category='object', target=None):
        actions = []
        #self.registerDojo()
        self.registerDojoFormAll()
        if target is None:
            target = self.virtualTarget
        if category in self.actions:
            actions.extend(self.actions[category](self, target=target))
        if target is not None:
            actions.extend(target.getActions(category, page=self, target=target))
        if target != self.virtualTarget:  # self view must be used directly for target
            actions.extend(self.view.getAdditionalActions(category, self, target))
        return actions

    def getPortletActions(self, target=None):
        actions = []
        cmeUrl = self.conceptMapEditorUrl
        if cmeUrl:
            actions.append(Action(self, title='Edit Concept Map',
                      targetWindow='loops_cme',
                      description='Open concept map editor in new window',
                      url=cmeUrl, target=target))
        if self.checkAction('create_resource', 'portlet', target):
            actions.append(DialogAction(self, title='Create Resource...',
                      description='Create a new resource object.',
                      page=self, target=target))
        return actions

    actions = dict(portlet=getPortletActions)

    def checkAction(self, name, category, target):
        if name in ('create_resource',) and target is not None:
            return target.checkAction(name, category, target)
        return super(NodeView, self).checkAction(name, category, target)

    @Lazy
    def popupCreateObjectForm(self):
        return ("javascript:function%%20openDialog(url){"
                    "window.open('%s/create_object_popup.html"
                            "?title='+document.title+'"
                            "&form.type=.loops/concepts/note&fixed_type=yes&linkUrl='+url,"
                        "'loops_dialog',"
                        "'width=650,height=550,left=300,top=200');;"
                        "}"
                    "openDialog(window.location.href);" % self.topMenu.url)

    @Lazy
    def hasEditableTarget(self):
        return IResource.providedBy(self.virtualTargetObject)

    @Lazy
    def inlineEditable(self):
        target = self.virtualTarget
        return target and target.inlineEditable or False

    def inlineEdit(self, id):
        self.registerDojo()
        cm = self.controller.macros
        jsCall = 'dojo.require("dijit.Editor")'
        cm.register('js-execute', jsCall, jsCall=jsCall)
        return ('return inlineEdit("%s", "%s/inline_save")'
                                        % (id, self.virtualTargetUrl))

    def checkRTE(self):
        target = self.virtualTarget
        if target and target.inlineEditable:
            self.registerDojo()
            cm = self.controller.macros
            jsCall = 'dojo.require("dijit.Editor")'
            cm.register('js-execute', jsCall, jsCall=jsCall)

    def externalEdit(self):
        target = self.virtualTargetObject
        if target is None:
            target = self.context
            url = self.url
        else:
            ti = IType(target).typeInterface
            if ti is not None:
                target = ti(target)
            url = self.virtualTargetUrl
        self.recordAccess('external_edit')
        return ExternalEditorView(target, self.request).load(url=url)

    # work items

    @Lazy
    def work_macros(self):
        from loops.organize.work.browser import work_macros
        return work_macros.macros

    # comments

    @Lazy
    def comment_macros(self):
        from loops.organize.comment.browser import comment_macros
        return comment_macros.macros

    @Lazy
    def comments(self):
        return component.getMultiAdapter((self.context, self.request),
                                         name='comments.html')


# inner HTML views


class ObjectInfo(NodeView):

    __call__ = innerHtml

    @property
    def macro(self):
        return info_macros.macros['object_info']

    @Lazy
    def dialog_name(self):
        return self.request.get('dialog', 'object_info')


class InlineEdit(NodeView):
    """ Provides inline editor as inner HTML"""

    @Lazy
    def macro(self):
        return self.template.macros['inline_edit']

    def __call__(self):
        return innerHtml(self)

    @property
    def body(self):
        return self.virtualTargetObject.data

    def save(self):
        target = self.virtualTargetObject
        ti = IType(target).typeInterface
        if ti is not None:
            target = ti(target)
        data = self.request.form['editorContent']
        if type(data) != unicode:
            try:
                data = data.decode('ISO-8859-15')  # IE hack
            except UnicodeDecodeError:
                print 'loops.browser.node.InlineEdit.save():', data
                return
        #    data = data.decode('UTF-8')
        target.data = data
        notify(ObjectModifiedEvent(target, Attributes(IResource, 'data')))
        #versionParam = self.hasVersions and '?version=this' or ''
        #self.request.response.redirect(self.virtualTargetUrl + versionParam)
        return 'OK'


# special (named) views for nodes

class SpecialNodeView(NodeView):

    macroName = None # to be provided by subclass

    @Lazy
    def macro(self):
        return self.template.macros[self.macroName]

    @Lazy
    def view(self):
        return self


class ContentView(SpecialNodeView):

    macroName = 'content_only'


class ListPages(SpecialNodeView):

    macroName = 'listpages'


class ListResources(SpecialNodeView):

    macroName = 'listresources'


class ListChildren(SpecialNodeView):

    macroName = 'listchildren'


class ConfigureView(NodeView):
    """ An editing view for configuring a node, optionally creating
        a target object.
    """

    def __init__(self, context, request):
        #self.context = context
        self.context = removeSecurityProxy(context)
        self.request = request

    @Lazy
    def target(self):
        obj = self.targetObject
        if obj is not None:
            return component.getMultiAdapter((obj, self.request))

    def update(self):
        request = self.request
        action = request.get('action')
        if action is None or action == 'search':
            return True
        if action == 'create':
            return self.createAndAssign()
        if action == 'assign':
            token = request.get('token')
            if token:
                target = self.loopsRoot.loopsTraverse(token)
            else:
                target = None
            self.context.target = target
        # TODO: raise error
        return True

    def createAndAssign(self):
        form = self.request.form
        root = self.loopsRoot
        token = form.get('create.type', 'loops.resource.MediaAsset')
        type = ITypeManager(self.context).getType(token)
        factory = type.factory
        container = type.defaultContainer
        name = form.get('create.name', '')
        if not name:
            viewManagerPath = zapi.getPath(root.getViewManager())
            name = zapi.getPath(self.context)[len(viewManagerPath)+1:]
            name = name.replace('/', '.')
        # check for duplicates:
        num = 1
        basename = name
        while name in container:
            name = '%s-%d' % (basename, num)
            num += 1
        container[name] = removeSecurityProxy(factory())
        target = container[name]
        target.title = form.get('create.title', u'')
        if IConcept.providedBy(target):
            target.conceptType = type.typeProvider
        elif IResource.providedBy(target):
            target.resourceType = type.typeProvider
        notify(ObjectCreatedEvent(target))
        notify(ObjectModifiedEvent(target))
        self.context.target = target
        return True

    def targetTypes(self):
        return util.KeywordVocabulary([(t.token, t.title)
                        for t in ITypeManager(self.context).types])

    def targetTypesForSearch(self):
        general = [('loops:*', 'Any'), ('loops:concept:*', 'Any Concept'),
                   ('loops:resource:*', 'Any Resource'),]
        return util.KeywordVocabulary(general + [(t.tokenForSearch, t.title)
                        for t in ITypeManager(self.context).types])

    @Lazy
    def search(self):
        request = self.request
        if request.get('action') != 'search':
            return []
        searchTerm = request.get('searchTerm', None)
        searchType = request.get('searchType', None)
        if searchTerm or searchType:
            criteria = {}
            if searchTerm:
                criteria['loops_title'] = searchTerm
            if searchType:
                if searchType.endswith('*'):
                    start = searchType[:-1]
                    end = start + '\x7f'
                else:
                    start = end = searchType
                criteria['loops_type'] = (start, end)
            cat = component.getUtility(ICatalog)
            result = cat.searchResults(**criteria)
            # TODO: can this be done in a faster way?
            result = [r for r in result if r.getLoopsRoot() == self.loopsRoot]
        else:
            result = (list(self.loopsRoot.getConceptManager().values())
                    + list(self.loopsRoot.getResourceManager().values()))
        return list(self.viewIterator(result))

    def viewIterator(self, objs):
        request = self.request
        for o in objs:
            if o == self.context.target:
                continue
            yield BaseView(o, request)


class NodeAdding(Adding):

    pass

    def xx_addingInfo(self):
        info = super(NodeAdding, self).addingInfo()
        #info.append({'title': 'Document',
        #             'action': 'AddLoopsNodeDocument.html',
        #             'selected': '',
        #             'has_custom_add_view': True,
        #             'description': 'This creates a node with an associated document'})
        return info


class ViewPropertiesConfigurator(object):

    interface.implements(IViewConfiguratorSchema)
    component.adapts(INode)

    def __init__(self, context):
        self.context = removeSecurityProxy(context)

    def setSkinName(self, skinName):
        ann = IAnnotations(self.context)
        setting = ann.get(configurator.ANNOTATION_KEY, {})
        setting['skinName'] = {'value': skinName}
        ann[configurator.ANNOTATION_KEY] = setting
    def getSkinName(self):
        ann = IAnnotations(self.context)
        setting = ann.get(configurator.ANNOTATION_KEY, {})
        return setting.get('skinName', {}).get('value', '')
    skinName = property(getSkinName, setSkinName)

    def setOptions(self, options):
        ann = IAnnotations(self.context)
        setting = ann.get(configurator.ANNOTATION_KEY, {})
        setting['options'] = {'value': options}
        ann[configurator.ANNOTATION_KEY] = setting
    def getOptions(self):
        ann = IAnnotations(self.context)
        setting = ann.get(configurator.ANNOTATION_KEY, {})
        return setting.get('options', {}).get('value', [])
    options = property(getOptions, setOptions)


class NodeViewConfigurator(configurator.AnnotationViewConfigurator):
    """ Take properties from next menu item...
    """

    @property
    def viewProperties(self):
        result = []
        for p in list(reversed(zapi.getParents(self.context))) + [self.context]:
            if not INode.providedBy(p) or p.nodeType != 'menu':
                continue
            ann = IAnnotations(p)
            propDefs = ann.get(configurator.ANNOTATION_KEY, {})
            if propDefs:
                result.extend([self.setupViewProperty(prop, propDef)
                                for prop, propDef in propDefs.items() if propDef])
        return result


# traveral adapter

class NodeTraverser(ItemTraverser):

    component.adapts(INode)

    def publishTraverse(self, request, name):
        viewAnnotations = request.annotations.setdefault('loops.view', {})
        viewAnnotations['node'] = self.context
        #context = removeSecurityProxy(self.context)
        context = self.context
        if context.nodeType == 'menu':
            setViewConfiguration(context, request)
        if name == '.loops':
            return self.context.getLoopsRoot()
        if name.startswith('.'):
            name = self.cleanUpTraversalStack(request, name)[1:]
            #traversalStack = request._traversal_stack
            #while traversalStack and traversalStack[0].startswith('.target'):
            #    # skip obsolete target references in the url
            #    name = traversalStack.pop(0)
            #traversedNames = request._traversed_names
            #if traversedNames:
            #    lastTraversed = traversedNames[-1]
            #    if lastTraversed.startswith('.target') and lastTraversed != name:
            #        # let <base .../> tag show the current object
            #        traversedNames[-1] = name
            #if len(name) > len('.target'):
            #    uid = int(name[len('.target'):])
            #    target = util.getObjectForUid(uid)
            #else:
            #    target = self.context.target
            target = self.getTarget(name)
            if target is not None:
                # remember self.context in request
                if request.method == 'PUT':
                    # we have to use the target object directly
                    return target
                else:
                    # switch to correct version if appropriate
                    target = getVersion(target, request)
                    # we'll use the target object in the node's context
                    viewAnnotations['target'] = target
                    return self.context
        obj = super(NodeTraverser, self).publishTraverse(request, name)
        return obj

    def cleanUpTraversalStack(self, request, name):
        traversalStack = request._traversal_stack
        while traversalStack and traversalStack[0].startswith('.'):
            # skip obsolete target references in the url
            name = traversalStack.pop(0)
        traversedNames = request._traversed_names
        if traversedNames:
            lastTraversed = traversedNames[-1]
            if lastTraversed.startswith('.') and lastTraversed != name:
                # let <base .../> tag show the current object
                traversedNames[-1] = name
        return name

    def getTarget(self, name):
        if name.startswith('target'):
            name = name[6:]
        if '-' in name:
            name, ignore = name.split('-', 1)
        if name and name.isdigit():
            return util.getObjectForUid(int(name))
        return self.context.target


def setViewConfiguration(context, request):
    viewAnnotations = request.annotations.setdefault('loops.view', {})
    config = IViewConfiguratorSchema(context)
    skinName = config.skinName
    if not skinName:
        skinName = context.getLoopsRoot().skinName
    if skinName:
        viewAnnotations['skinName'] = skinName
    if config.options:
        viewAnnotations['options'] = config.options
    return dict(skinName=skinName, options=config.options)

def getViewConfiguration(context, request):
    if INode.providedBy(context) and context.nodeType == 'menu':
        setViewConfiguration(context, request)
    viewAnnotations = request.annotations.get('loops.view', {})
    return dict(skinName=viewAnnotations.get('skinName'),
                options=viewAnnotations.get('options'))