"""Set of HTML automatic forms to create, delete, copy or edit a single entity

or a list of entities of the same type

: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 copy import copy

from simplejson import dumps

from logilab.mtconverter import xml_escape

from logilab.common.decorators import cached

from cubicweb.selectors import (match_kwargs, one_line_rset, non_final_entity,

                                specified_etype_implements, implements, yes)

from cubicweb.view import EntityView

from cubicweb import tags

from cubicweb.web import uicfg, stdmsgs, eid_param, \

     formfields as ff, formwidgets as fw

from cubicweb.web.form import FormViewMixIn, FieldNotFound

from cubicweb.web.views import forms

_pvdc = uicfg.primaryview_display_ctrl

class DeleteConfForm(forms.CompositeForm):

    __regid__ = 'deleteconf'

    # XXX non_final_entity does not implement eclass_selector

    __select__ = implements('Any')

    domid = 'deleteconf'

    copy_nav_params = True

    form_buttons = [fw.Button(stdmsgs.BUTTON_DELETE, cwaction='delete'),

                    fw.Button(stdmsgs.BUTTON_CANCEL, cwaction='cancel')]

    def __init__(self, *args, **kwargs):

        super(DeleteConfForm, self).__init__(*args, **kwargs)

        done = set()

        for entity in self.cw_rset.entities():

            if entity.eid in done:

                continue

            done.add(entity.eid)

            subform = self._cw.vreg['forms'].select('base', self._cw,

                                                    entity=entity,

                                                    mainform=False)

            self.add_subform(subform)

class DeleteConfFormView(FormViewMixIn, EntityView):

    """form used to confirm deletion of some entities"""

    __regid__ = 'deleteconf'

    title = _('delete')

    # don't use navigation, all entities asked to be deleted should be displayed

    # else we will only delete the displayed page

    paginable = False

    def call(self, onsubmit=None):

        """ask for confirmation before real deletion"""

        req, w = self._cw, self.w

        _ = req._

        w(u'<script type="text/javascript">updateMessage(\'%s\');</script>\n'

          % _('this action is not reversible!'))

        # XXX above message should have style of a warning

        w(u'<h4>%s</h4>\n' % _('Do you want to delete the following element(s) ?'))

        form = self._cw.vreg['forms'].select(self.__regid__, req,

                                             rset=self.cw_rset,

                                             onsubmit=onsubmit)

        w(u'<ul>\n')

        for entity in self.cw_rset.entities():

            # don't use outofcontext view or any other that may contain inline

            # edition form

            w(u'<li>%s</li>' % tags.a(entity.view('textoutofcontext'),

                                      href=entity.absolute_url()))

        w(u'</ul>\n')

        w(form.render())

class EditionFormView(FormViewMixIn, EntityView):

    """display primary entity edition form"""

    __regid__ = 'edition'

    # add yes() so it takes precedence over deprecated views in baseforms,

    # though not baseforms based customized view

    __select__ = one_line_rset() & non_final_entity() & yes()

    title = _('edition')

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

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

        self.render_form(entity)

    def render_form(self, entity):

        """fetch and render the form"""

        self.form_title(entity)

        form = self._cw.vreg['forms'].select('edition', self._cw, entity=entity,

                                             submitmsg=self.submited_message())

        self.init_form(form, entity)

        self.w(form.render())

    def init_form(self, form, entity):

        """customize your form before rendering here"""

        pass

    def form_title(self, entity):

        """the form view title"""

        ptitle = self._cw._(self.title)

        self.w(u'<div class="formTitle"><span>%s %s</span></div>' % (

            entity.dc_type(), ptitle and '(%s)' % ptitle))

    def submited_message(self):

        """return the message that will be displayed on successful edition"""

        return self._cw._('entity edited')

class CreationFormView(EditionFormView):

    """display primary entity creation form"""

    __regid__ = 'creation'

    __select__ = specified_etype_implements('Any') & yes()

    title = _('creation')

    def call(self, **kwargs):

        """creation view for an entity"""

        # at this point we know etype is a valid entity type, thanks to our

        # selector

        etype = kwargs.pop('etype', self._cw.form.get('etype'))

        entity = self._cw.vreg['etypes'].etype_class(etype)(self._cw)

        entity.eid = self._cw.varmaker.next()

        self.render_form(entity)

    def form_title(self, entity):

        """the form view title"""

        if '__linkto' in self._cw.form:

            if isinstance(self._cw.form['__linkto'], list):

                # XXX which one should be considered (case: add a ticket to a

                # version in jpl)

                rtype, linkto_eid, role = self._cw.form['__linkto'][0].split(':')

            else:

                rtype, linkto_eid, role = self._cw.form['__linkto'].split(':')

            linkto_rset = self._cw.eid_rset(linkto_eid)

            linkto_type = linkto_rset.description[0][0]

            if role == 'subject':

                title = self._cw.__('creating %s (%s %s %s %%(linkto)s)' % (

                    entity.e_schema, entity.e_schema, rtype, linkto_type))

            else:

                title = self._cw.__('creating %s (%s %%(linkto)s %s %s)' % (

                    entity.e_schema, linkto_type, rtype, entity.e_schema))

            msg = title % {'linkto' : self._cw.view('incontext', linkto_rset)}

            self.w(u'<div class="formTitle notransform"><span>%s</span></div>' % msg)

        else:

            super(CreationFormView, self).form_title(entity)

    def url(self):

        """return the url associated with this view"""

        return self.create_url(self._cw.form.get('etype'))

    def submited_message(self):

        """return the message that will be displayed on successful edition"""

        return self._cw._('entity created')

class CopyFormView(EditionFormView):

    """display primary entity creation form initialized with values from another

    entity

    """

    __regid__ = 'copy'

    title = _('copy')

    warning_message = _('Please note that this is only a shallow copy')

    def render_form(self, entity):

        """fetch and render the form"""

        # make a copy of entity to avoid altering the entity in the

        # request's cache.

        entity.complete()

        self.newentity = copy(entity)

        self.copying = entity

        self.newentity.eid = self._cw.varmaker.next()

        self.w(u'<script type="text/javascript">updateMessage("%s");</script>\n'

               % self._cw._(self.warning_message))

        super(CopyFormView, self).render_form(self.newentity)

        del self.newentity

    def init_form(self, form, entity):

        """customize your form before rendering here"""

        super(CopyFormView, self).init_form(form, entity)

        if entity.eid == self.newentity.eid:

            form.add_hidden(eid_param('__cloned_eid', entity.eid),

                            self.copying.eid)

        for rschema, role in form.editable_attributes():

            if not rschema.final:

                # ensure relation cache is filed

                rset = self.copying.related(rschema, role)

                self.newentity.set_related_cache(rschema, role, rset)

    def submited_message(self):

        """return the message that will be displayed on successful edition"""

        return self._cw._('entity copied')

class TableEditForm(forms.CompositeForm):

    __regid__ = 'muledit'

    domid = 'entityForm'

    onsubmit = "return validateForm('%s', null);" % domid

    form_buttons = [fw.SubmitButton(_('validate modifications on selected items')),

                    fw.ResetButton(_('revert changes'))]

    def __init__(self, req, rset, **kwargs):

        kwargs.setdefault('__redirectrql', rset.printable_rql())

        super(TableEditForm, self).__init__(req, rset=rset, **kwargs)

        for row in xrange(len(self.cw_rset)):

            form = self._cw.vreg['forms'].select('edition', self._cw,

                                                 rset=self.cw_rset, row=row,

                                                 formtype='muledit',

                                                 copy_nav_params=False,

                                                 mainform=False)

            # XXX rely on the EntityCompositeFormRenderer to put the eid input

            form.remove_field(form.field_by_name('eid'))

            self.add_subform(form)

class TableEditFormView(FormViewMixIn, EntityView):

    __regid__ = 'muledit'

    __select__ = EntityView.__select__ & yes()

    title = _('multiple edit')

    def call(self, **kwargs):

        """a view to edit multiple entities of the same type the first column

        should be the eid

        """

        # XXX overriding formvid (eg __form_id) necessary to make work edition:

        # the edit controller try to select the form with no rset but

        # entity=entity, and use this form to edit the entity. So we want

        # edition form there but specifying formvid may have other undesired

        # side effect. Maybe we should provide another variable optionally

        # telling which form the edit controller should select (eg difffers

        # between html generation / post handling form)

        form = self._cw.vreg['forms'].select(self.__regid__, self._cw,

                                             rset=self.cw_rset,

                                             copy_nav_params=True,

                                             formvid='edition')

        self.w(form.render())

# click and edit handling ('reledit') ##########################################

class DummyForm(object):

    __slots__ = ('event_args',)

    def form_render(self, **_args):

        return u''

    def render(self, **_args):

        return u''

    def append_field(self, *args):

        pass

    def field_by_name(self, rtype, role, eschema=None):

        return None

class ClickAndEditFormView(FormViewMixIn, EntityView):

    """form used to permit ajax edition of a relation or attribute of an entity

    in a view, if logged user have the permission to edit it.

    (double-click on the field to see an appropriate edition widget).

    """

    __regid__ = 'doreledit'

    __select__ = non_final_entity() & match_kwargs('rtype')

    # FIXME editableField class could be toggleable from userprefs

    _onclick = u"showInlineEditionForm(%(eid)s, '%(rtype)s', '%(divid)s')"

    _onsubmit = ("return inlineValidateRelationForm('%(rtype)s', '%(role)s', '%(eid)s', "

                 "'%(divid)s', %(reload)s, '%(vid)s', '%(default)s', '%(lzone)s');")

    _cancelclick = "hideInlineEdit(%s,\'%s\',\'%s\')"

    _defaultlandingzone = (u'<img title="%(msg)s" src="data/pen_icon.png" '

                           'alt="%(msg)s"/>')

    _landingzonemsg = _('click to edit this field')

    # default relation vids according to cardinality

    _one_rvid = 'incontext'

    _many_rvid = 'csv'

    def cell_call(self, row, col, rtype=None, role='subject',

                  reload=False,      # controls reloading the whole page after change

                  rvid=None,         # vid to be applied to other side of rtype (non final relations only)

                  default=None,      # default value

                  landing_zone=None  # prepend value with a separate html element to click onto

                                     # (esp. needed when values are links)

                  ):

        """display field to edit entity's `rtype` relation on click"""

        assert rtype

        assert role in ('subject', 'object'), '%s is not an acceptable role value' % role

        self._cw.add_js('cubicweb.edition.js')

        self._cw.add_css('cubicweb.form.css')

        if default is None:

            default = xml_escape(self._cw._('<no value>'))

        schema = self._cw.vreg.schema

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

        rschema = schema.rschema(rtype)

        lzone = self._build_landing_zone(landing_zone)

        # compute value, checking perms, build form

        if rschema.final:

            form = self._build_form(entity, rtype, role, 'base', default, reload, lzone)

            if not self.should_edit_attribute(entity, rschema, form):

                self.w(entity.printable_value(rtype))

                return

            value = entity.printable_value(rtype) or default

        else:

            rvid = self._compute_best_vid(entity.e_schema, rschema, role)

            rset = entity.related(rtype, role)

            if rset:

                value = self._cw.view(rvid, rset)

            else:

                value = default

            if not self.should_edit_relation(entity, rschema, role, rvid):

                if rset:

                    self.w(value)

                return

            # XXX do we really have to give lzone twice?

            form = self._build_form(entity, rtype, role, 'base', default, reload, lzone,

                                    dict(vid=rvid, lzone=lzone))

        field = form.field_by_name(rtype, role, entity.e_schema)

        form.append_field(field)

        self.relation_form(lzone, value, form,

                           self._build_renderer(entity, rtype, role))

    def should_edit_attribute(self, entity, rschema, form):

        rtype = str(rschema)

        rdef = entity.e_schema.rdef(rtype)

        afs = uicfg.autoform_section.etype_get(

            entity.__regid__, rtype, 'subject', rdef.object)

        if 'main_hidden' in afs or not entity.has_perm('update'):

            return False

        if not rdef.has_perm(self._cw, 'update', eid=entity.eid):

            return False

        try:

            form.field_by_name(rtype, 'subject', entity.e_schema)

        except FieldNotFound:

            return False

        return True

    def should_edit_relation(self, entity, rschema, role, rvid):

        if ((role == 'subject' and not rschema.has_perm(self._cw, 'add',

                                                        fromeid=entity.eid))

            or

            (role == 'object' and not rschema.has_perm(self._cw, 'add',

                                                       toeid=entity.eid))):

            return False

        return True

    def relation_form(self, lzone, value, form, renderer):

        """xxx-reledit div (class=field)

              +-xxx div (class="editableField")

              |   +-landing zone

              +-xxx-value div

              +-xxx-form div

        """