# copyright 2003-2011 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/>.

"""breadcrumbs components definition for CubicWeb web client"""

__docformat__ = "restructuredtext en"

_ = unicode

from warnings import warn

from logilab.mtconverter import xml_escape

from cubicweb import tags, uilib

from cubicweb.entity import Entity

from cubicweb.predicates import (is_instance, one_line_rset, adaptable,

                                one_etype_rset, multi_lines_rset, any_rset,

                                match_form_params)

from cubicweb.view import EntityView, EntityAdapter

from cubicweb.web.views import basecomponents

# don't use AnyEntity since this may cause bug with isinstance() due to reloading

class IBreadCrumbsAdapter(EntityAdapter):

    """adapters for entities which can be"located" on some path to display in

    the web ui

    """

    __regid__ = 'IBreadCrumbs'

    __select__ = is_instance('Any', accept_none=False)

    def parent_entity(self):

        itree = self.entity.cw_adapt_to('ITree')

        if itree is not None:

            return itree.parent()

        return None

    def breadcrumbs(self, view=None, recurs=None):

        """return a list containing some:

        * tuple (url, label)

        * entity

        * simple label string

        defining path from a root to the current view

        the main view is given as argument so breadcrumbs may vary according to

        displayed view (may be None). When recursing on a parent entity, the

        `recurs` argument should be a set of already traversed nodes (infinite

        loop safety belt).

        """

        parent = self.parent_entity()

        if parent is not None:

            if recurs is True:

                _recurs = set()

                warn('[3.10] recurs argument should be a set() or None',

                     DeprecationWarning, stacklevel=2)

            elif recurs:

                _recurs = recurs

            else:

                if recurs is False:

                    warn('[3.10] recurs argument should be a set() or None',

                         DeprecationWarning, stacklevel=2)

                _recurs = set()

            if _recurs and parent.eid in _recurs:

                self.error('cycle in breadcrumbs for entity %s' % self.entity)

                return []

            _recurs.add(parent.eid)

            path = adapter.breadcrumbs(view, _recurs) + [self.entity]

        else:

            path = [self.entity]

        if not recurs:

            if view is None:

                if 'vtitle' in self._cw.form:

                    # embeding for instance

                    path.append( self._cw.form['vtitle'] )

            elif view.__regid__ != 'primary' and hasattr(view, 'title'):

                path.append( self._cw._(view.title) )

        return path

class BreadCrumbEntityVComponent(basecomponents.HeaderComponent):

    __regid__ = 'breadcrumbs'

    __select__ = (basecomponents.HeaderComponent.__select__

                  & one_line_rset() & adaptable('IBreadCrumbs'))

    order = basecomponents.ApplicationName.order + 1

    context = basecomponents.ApplicationName.context

    separator = u' > '

    link_template = u'<a href="%s">%s</a>'

    first_separator = True

    # XXX support kwargs for compat with other components which gets the view as

    # argument

    def render(self, w, **kwargs):

        try:

            entity = self.cw_extra_kwargs['entity']

        except KeyError:

            entity = self.cw_rset.get_entity(0, 0)

        view = self.cw_extra_kwargs.get('view')

        path = adapter.breadcrumbs(view)

        if path:

            self.open_breadcrumbs(w)

            if self.first_separator:

                w(self.separator)

            self.render_breadcrumbs(w, entity, path)

            self.close_breadcrumbs(w)

    def open_breadcrumbs(self, w):

        w(u'<span id="breadcrumbs" class="pathbar">')

    def close_breadcrumbs(self, w):

        w(u'</span>')

    def render_breadcrumbs(self, w, contextentity, path):

        root = path.pop(0)

        if isinstance(root, Entity):

            w(self.link_template % (self._cw.build_url(root.__regid__),

                                         root.dc_type('plural')))

            w(self.separator)

        self.wpath_part(w, root, contextentity, not path)

        for i, parent in enumerate(path):

            w(self.separator)

            w(u"\n")

            self.wpath_part(w, parent, contextentity, i == len(path) - 1)

    def wpath_part(self, w, part, contextentity, last=False): # XXX deprecates last argument?

        if isinstance(part, Entity):

            w(part.view('breadcrumbs'))

        elif isinstance(part, tuple):

            url, title = part

            textsize = self._cw.property_value('navigation.short-line-size')

            w(self.link_template % (

                xml_escape(url), xml_escape(uilib.cut(title, textsize))))

        else:

            textsize = self._cw.property_value('navigation.short-line-size')

            w(xml_escape(uilib.cut(unicode(part), textsize)))

class BreadCrumbETypeVComponent(BreadCrumbEntityVComponent):

    __select__ = (basecomponents.HeaderComponent.__select__

                  & multi_lines_rset() & one_etype_rset()

                  & adaptable('IBreadCrumbs'))

    def render_breadcrumbs(self, w, contextentity, path):

        # XXX hack: only display etype name or first non entity path part

        root = path.pop(0)

        if isinstance(root, Entity):

            w(u'<a href="%s">%s</a>' % (self._cw.build_url(root.__regid__),

                                        root.dc_type('plural')))

        else:

            self.wpath_part(w, root, contextentity, not path)

class BreadCrumbAnyRSetVComponent(BreadCrumbEntityVComponent):

    __select__ = basecomponents.HeaderComponent.__select__ & any_rset()

    # XXX support kwargs for compat with other components which gets the view as

    # argument

    def render(self, w, **kwargs):

        w(u'<span id="breadcrumbs" class="pathbar">')

        if self.first_separator:

            w(self.separator)

        w(self._cw._('search'))

        w(u'</span>')

class BreadCrumbLinkToVComponent(BreadCrumbEntityVComponent):

    __select__ = basecomponents.HeaderComponent.__select__ & match_form_params('__linkto')

    def render(self, w, **kwargs):

        eid = self._cw.list_form_param('__linkto')[0].split(':')[1]

        entity = self._cw.entity_from_eid(eid)

        ecmp = self._cw.vreg[self.__registry__].select(

            self.__regid__, self._cw, entity=entity, **kwargs)

        ecmp.render(w, **kwargs)

class BreadCrumbView(EntityView):

    __regid__ = 'breadcrumbs'

    def cell_call(self, row, col, **kwargs):

        entity = self.cw_rset.get_entity(row, col)

        desc = uilib.cut(entity.dc_description(), 50)

        # NOTE remember camember: tags.a autoescapes

        self.w(tags.a(entity.view('breadcrumbtext'),

                      href=entity.absolute_url(), title=desc))

class BreadCrumbTextView(EntityView):

    __regid__ = 'breadcrumbtext'

    def cell_call(self, row, col, **kwargs):

        entity = self.cw_rset.get_entity(row, col)

        textsize = self._cw.property_value('navigation.short-line-size')

        self.w(uilib.cut(entity.dc_title(), textsize))