"""navigation components definition 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 logilab.mtconverter import xml_escape

from cubicweb.interfaces import IBreadCrumbs

from cubicweb.selectors import (one_line_rset, implements, one_etype_rset,

                                multi_lines_rset, any_rset)

from cubicweb.view import EntityView, Component

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

from cubicweb.entity import Entity

from cubicweb import tags, uilib

class BreadCrumbEntityVComponent(Component):

    __regid__ = 'breadcrumbs'

    __select__ = one_line_rset() & implements(IBreadCrumbs, accept_none=False)

    cw_property_defs = {

        _('visible'):  dict(type='Boolean', default=True,

                            help=_('display the component or not')),

        }

    title = _('contentnavigation_breadcrumbs')

    help = _('contentnavigation_breadcrumbs_description')

    separator = u' > '

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

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

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

        path = entity.breadcrumbs(view)

        if path:

            self.open_breadcrumbs()

            if first_separator:

                self.w(self.separator)

            self.render_breadcrumbs(entity, path)

            self.close_breadcrumbs()

    def open_breadcrumbs(self):

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

    def close_breadcrumbs(self):

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

    def render_breadcrumbs(self, contextentity, path):

        root = path.pop(0)

        if isinstance(root, Entity):

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

                                         root.dc_type('plural')))

            self.w(self.separator)

        self.wpath_part(root, contextentity, not path)

        for i, parent in enumerate(path):

            self.w(self.separator)

            self.w(u"\n")

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

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

        if isinstance(part, Entity):

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

                self.w(xml_escape(part.view('breadcrumbtext')))

            else:

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

        elif isinstance(part, tuple):

            url, title = part

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

            self.w(self.link_template % (

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

        else:

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

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

class BreadCrumbETypeVComponent(BreadCrumbEntityVComponent):

    __select__ = multi_lines_rset() & one_etype_rset() & \

                 implements(IBreadCrumbs, accept_none=False)

    def render_breadcrumbs(self, contextentity, path):

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

        root = path.pop(0)

        if isinstance(root, Entity):

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

                                             root.dc_type('plural')))

        else:

            self.wpath_part(root, contextentity, not path)

class BreadCrumbAnyRSetVComponent(BreadCrumbEntityVComponent):

    __select__ = any_rset()

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

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

        if first_separator:

            self.w(self.separator)

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

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

class BreadCrumbView(EntityView):

    __regid__ = 'breadcrumbs'

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

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

        # XXX remember camember : tags.a autoescapes !

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

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

class BreadCrumbTextView(EntityView):

    __regid__ = 'breadcrumbtext'

        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))