# 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/>.

"""Set of views allowing edition of entities/relations using ajax"""

from cubicweb import role

from cubicweb.view import View

from cubicweb.predicates import match_form_params, match_kwargs

from cubicweb.web import component, stdmsgs, formwidgets as fw

class AddRelationView(component.EditRelationMixIn, View):

    """base class for view which let add entities linked by a given relation

    subclasses should define at least id, rtype and target class attributes.

    """

    __registry__ = 'views'

    __regid__ = 'xaddrelation'

    __select__ = (match_form_params('rtype', 'target')

                  | match_kwargs('rtype', 'target'))

    cw_property_defs = {} # don't want to inherit this from Box

    expected_kwargs = form_params = ('rtype', 'target')

    def cell_call(self, row, col, rtype=None, target=None, etype=None):

        self.rtype = rtype or self._cw.form['rtype']

        self.target = target or self._cw.form['target']

        self.etype = etype or self._cw.form.get('etype')

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

        rschema = self._cw.vreg.schema.rschema(self.rtype)

        if not self.etype:

            if self.target == 'object':

                etypes = rschema.objects(entity.e_schema)

            else:

                etypes = rschema.subjects(entity.e_schema)

            if len(etypes) == 1:

                self.etype = etypes[0]

        self.w(u'<div id="%s">' % self.domid)

        self.w(u'<h1>%s</h1>' % self._cw._('relation %(relname)s of %(ent)s')

               % {'relname': rschema.display_name(self._cw, role(self)),

                  'ent': entity.view('incontext')})

        self.w(u'<ul class="list-unstyled">')

        for boxitem in self.unrelated_boxitems(entity):

            self.w('<li>%s</li>' % boxitem)

        self.w(u'</ul></div>')

    def unrelated_entities(self, entity):

        """returns the list of unrelated entities

        if etype is not defined on the Box's class, the default

        behaviour is to use the entity's appropraite vocabulary function

        """

        # use entity.unrelated if we've been asked for a particular etype

        if getattr(self, 'etype', None):

            rset = entity.unrelated(self.rtype, self.etype, role(self),

                                    ordermethod='fetch_order')

            self.paginate(self._cw, rset=rset, w=self.w)

            return rset.entities()

        super(AddRelationView, self).unrelated_entities(self)

def ajax_composite_form(container, entity, rtype, okjs, canceljs,

                        entityfkwargs=None):

    """

    * if entity is None, edit container (assert container.has_eid())

    * if entity has not eid, will be created

    * if container has not eid, will be created (see vcreview InsertionPoint)

    """

    req = container._cw

    parentexists = entity is None or container.has_eid()

    buttons = [fw.Button(onclick=okjs),

               fw.Button(stdmsgs.BUTTON_CANCEL, onclick=canceljs)]

    freg = req.vreg['forms']

    # main form kwargs

    mkwargs = dict(action='#', domid='%sForm%s' % (rtype, container.eid),

                   form_buttons=buttons,

                   onsubmit='javascript: %s; return false' % okjs)

    # entity form kwargs

    # use formtype=inlined to skip the generic relations edition section

    fkwargs = dict(entity=entity or container, formtype='inlined')

    if entityfkwargs is not None:

        fkwargs.update(entityfkwargs)

    # form values

    formvalues = {}

    if entity is not None: # creation

        formvalues[rtype] = container.eid

    if parentexists: # creation / edition

        mkwargs.update(fkwargs)

        # use formtype=inlined to avoid viewing the relation edition section

        form = freg.select('edition', req, **mkwargs)

    else: # creation of both container and comment entities

        form = freg.select('composite', req, form_renderer_id='default',

                            **mkwargs)

        form.add_subform(freg.select('edition', req, entity=container,

                                      mainform=False, mainentity=True))

        form.add_subform(freg.select('edition', req, mainform=False, **fkwargs))

    return form, formvalues