"""navigation components definition for CubicWeb web client

:organization: Logilab

:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from logilab.mtconverter import html_escape

from cubicweb.interfaces import IBreadCrumbs

from cubicweb.common.selectors import (contextprop_selector, onelinerset_selector, 

                                    interface_selector)

from cubicweb.common.view import EntityView

from cubicweb.common.uilib import cut

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

from cubicweb.common.entity import Entity

from cubicweb.web.component import EntityVComponent

_ = unicode

def bc_title(entity):

    textsize = entity.req.property_value('navigation.short-line-size')

    return html_escape(cut(entity.dc_title(), textsize))

class BreadCrumbEntityVComponent(EntityVComponent):

    id = 'breadcrumbs'

    # register msg not generated since no entity implements IPrevNext in cubicweb itself

    title = _('contentnavigation_breadcrumbs')

    help = _('contentnavigation_breadcrumbs_description')

    __selectors__ = (onelinerset_selector, contextprop_selector, interface_selector)

    accepts_interfaces = (IBreadCrumbs,)

    context = 'navtop'

    order = 5

    visible = False

    separator = u' > '

    def call(self, view=None, first_separator=True):

        entity = self.entity(0)

        path = entity.breadcrumbs(view)

        if path:

            self.w(u'<span class="pathbar">')

            if first_separator:

                self.w(self.separator)

            root = path.pop(0)

            if isinstance(root, Entity):

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

                                                 root.dc_type('plural')))

                self.w(self.separator)

            self.wpath_part(root, entity, not path)

            for i, parent in enumerate(path):

                self.w(self.separator)

                self.w(u"\n")

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

            self.w(u'</span>')

    def wpath_part(self, part, contextentity, last=False):

        if isinstance(part, Entity):

            if last and part.eid == contextentity.eid:

                self.w(bc_title(part))

            else:

                part.view('breadcrumbs', w=self.w)

        elif isinstance(part, tuple):

            url, title = part

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

            self.w(u'<a href="%s">%s</a>' % (

                html_escape(url), html_escape(cut(title, textsize))))

        else:

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

            self.w(cut(unicode(part), textsize))

class BreadCrumbComponent(BreadCrumbEntityVComponent):

    __registry__ = 'components'

    __selectors__ = (onelinerset_selector, interface_selector)

    visible = True

class BreadCrumbView(EntityView):

    id = 'breadcrumbs'

    def cell_call(self, row, col):

        entity = self.entity(row, col)

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

        self.w(u'<a href="%s" title="%s">%s</a>' % (html_escape(entity.absolute_url()),

                                                    html_escape(desc),

                                                    bc_title(entity)))