"""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: 2001-2009 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 cubicweb.selectors import (match_kwargs, one_line_rset, non_final_entity,

                                specified_etype_implements, yes)

from cubicweb.utils import make_uid, compute_cardinality, get_schema_property

from cubicweb.view import EntityView

from cubicweb.common import tags

from cubicweb.web import INTERNAL_FIELD_VALUE, stdmsgs, eid_param

from cubicweb.web.form import FormViewMixIn

from cubicweb.web.formfields import guess_field

from cubicweb.web.formwidgets import Button, SubmitButton, ResetButton

from cubicweb.web.views import forms

def relation_id(eid, rtype, role, reid):

    """return an identifier for a relation between two entities"""

    if role == 'subject':

        return u'%s:%s:%s' % (eid, rtype, reid)

    return u'%s:%s:%s' % (reid, rtype, eid)

def toggleable_relation_link(eid, nodeid, label='x'):

    """return javascript snippet to delete/undelete a relation between two

    entities

    """

    js = u"javascript: togglePendingDelete('%s', %s);" % (

        nodeid, xml_escape(dumps(eid)))

    return u'[<a class="handle" href="%s" id="handle%s">%s</a>]' % (

        js, nodeid, label)

class DeleteConfForm(FormViewMixIn, EntityView):

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

    id = 'deleteconf'

    title = _('delete')

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

    # else we will only delete the displayed page

    need_navigation = False

    def call(self, onsubmit=None):

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

        req, w = self.req, 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.vreg.select_object('forms', 'composite', req, domid='deleteconf',

                                       copy_nav_params=True,

                                       action=self.build_url('edit'), onsubmit=onsubmit,

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

                                                     Button(stdmsgs.NO, cwaction='cancel')])

        done = set()

        w(u'<ul>\n')

        for entity in self.rset.entities():

            if entity.eid in done:

                continue

            done.add(entity.eid)

            subform = self.vreg.select_object('forms', 'base', req, entity=entity,

                                              mainform=False)

            form.form_add_subform(subform)

            # 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.form_render())

class ClickAndEditFormView(FormViewMixIn, EntityView):

    """form used to permit ajax edition of an attribute of an entity in a view

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

    """

    id = 'reledit'

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

    # FIXME editableField class could be toggleable from userprefs

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

    # default relation vids according to cardinality

    _one_rvid = 'incontext'

    _many_rvid = 'csv'

    def _compute_best_vid(self, entity, rtype, role):

        if compute_cardinality(entity.e_schema,

                               entity.schema.rschema(rtype),

                               role) in '+*':

            return self._many_rvid

        return self._one_rvid

    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

                  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 double-click"""

        assert rtype

        entity = self.entity(row, col)

        rschema = entity.schema.rschema(rtype)

        if not default:

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

        # compute value, checking perms, build form

        if rschema.is_final():

            value = entity.printable_value(rtype) or default

            if not entity.has_perm('update'):

                self.w(value)

                return

            form = self._build_attribute_form(entity, value, rtype, role, reload,

                                              row, col, default, landing_zone)

        else:

            if rvid is None:

                rvid = self._compute_best_vid(entity, rtype, role)

            rset = entity.related(rtype, role)

            candidate = self.view(rvid, rset, 'null')

            value = candidate or default

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

                                                         fromeid=entity.eid):

                return self.w(value)

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

                                                           toeid=entity.eid):

                return self.w(value)

            elif get_schema_property(entity.e_schema,

                return self.w(value)

            form = self._build_relation_form(entity, value, rtype, role, reload, row, col,

                                             rvid, default, landing_zone)

        renderer = self.vreg.select_object('formrenderers', 'base', self.req,

                                      entity=entity,

                                      display_label=False, display_help=False,

                                      display_fields=[(rtype, role)],

                                      table_class='', button_bar_class='buttonbar',

                                      display_progress_div=False)

        self.w(form.form_render(renderer=renderer))

    def _build_relation_form(self, entity, value, rtype, role, row, col, reload, rvid,

                             default, lzone):

        value = lzone + value

        divid = 'd%s' % make_uid('%s-%s' % (rtype, entity.eid))

        event_data = {'divid' : divid, 'eid' : entity.eid, 'rtype' : rtype, 'vid' : rvid,

                      'reload' : reload, 'default' : default, 'role' : role,

                      'lzone' : lzone}

        onsubmit = ("return inlineValidateRelationForm('%(divid)s-form', '%(rtype)s', "

                    "'%(role)s', '%(eid)s', '%(divid)s', %(reload)s, '%(vid)s', "

                    "'%(default)s', '%(lzone)s');"

                    % event_data)

        cancelclick = "cancelInlineEdit(%s,\'%s\',\'%s\')" % (

            entity.eid, rtype, divid)

        form = self.vreg.select_object('forms', 'base', self.req, entity=entity,

                                       domid='%s-form' % divid, cssstyle='display: none',

                                       onsubmit=onsubmit, action='#',

                                       form_buttons=[SubmitButton(),

                                                     Button(stdmsgs.BUTTON_CANCEL,

                                                       onclick=cancelclick)])

        field = guess_field(entity.e_schema, entity.schema.rschema(rtype), role)

        form.append_field(field)

        self.w(tags.div(value, klass='editableField', id=divid,

                        onclick=self._onclick % event_data))

        return form

    def _build_attribute_form(self, entity, value, rtype, role, reload, row, col, default, lzone):

        eid = entity.eid

        divid = 'd%s' % make_uid('%s-%s' % (rtype, eid))

        event_data = {'divid' : divid, 'eid' : eid, 'rtype' : rtype,

                      'reload' : dumps(reload), 'default' : default, 'lzone' : lzone}

        onsubmit = ("return inlineValidateAttributeForm('%(divid)s-form', '%(rtype)s', "

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

        buttons = [SubmitButton(stdmsgs.BUTTON_OK),

                   Button(stdmsgs.BUTTON_CANCEL,

                          onclick="cancelInlineEdit(%s,\'%s\',\'%s\')" % (

                              eid, rtype, divid))]

        form = self.vreg.select_object('forms', 'edition', self.req, self.rset,

                                       row=row, col=col, form_buttons=buttons,

                                       domid='%s-form' % divid, action='#',

                                       cssstyle='display: none',

                                       onsubmit=onsubmit % event_data)

        self.w(tags.div(value, klass='editableField', id=divid,

                        onclick=self._onclick % event_data))

        return form

class EditionFormView(FormViewMixIn, EntityView):

    """display primary entity edition form"""

    id = '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.complete_entity(row, col)

        self.render_form(entity)

    def render_form(self, entity):

        """fetch and render the form"""

        self.form_title(entity)

        form = self.vreg.select_object('forms', 'edition', self.req, entity.rset,

                                       row=entity.row, col=entity.col, entity=entity,

                                       submitmsg=self.submited_message())

        self.init_form(form, entity)

        self.w(form.form_render(formvid=u'edition'))

    def init_form(self, form, entity):

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

        pass

    def form_title(self, entity):

        """the form view title"""

        ptitle = self.req._(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.req._('entity edited')

class CreationFormView(EditionFormView):

    """display primary entity creation form"""

    id = 'creation'

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

    title = _('creation')

    def call(self, **kwargs):

        """creation view for an entity"""

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

        try:

            entity = self.vreg.etype_class(etype)(self.req)

        except:

            self.w(self.req._('no such entity type %s') % etype)

        else:

            self.initialize_varmaker()

            entity.eid = self.varmaker.next()

            self.render_form(entity)

    def form_title(self, entity):

        """the form view title"""

        if '__linkto' in self.req.form:

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

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

                # version in jpl)

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

            else:

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

            linkto_rset = self.req.eid_rset(linkto_eid)

            linkto_type = linkto_rset.description[0][0]

            if role == 'subject':

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

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

            else:

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

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

            msg = title % {'linkto' : self.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.req.form.get('etype'))

    def submited_message(self):

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

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

class CopyFormView(EditionFormView):

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

    entity

    """

    id = '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.initialize_varmaker()

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

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

               % self.req._('Please note that this is only a shallow copy'))

        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.form_add_hidden(eid_param('__cloned_eid', entity.eid),

                                 self.copying.eid)

        for rschema, _, role in form.relations_by_category(form.attrcategories,

                                                           'add'):

            if not rschema.is_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.req._('entity copied')

class TableEditForm(forms.CompositeForm):

    id = 'muledit'

    domid = 'entityForm'

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

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

                    ResetButton(_('revert changes'))]

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

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

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

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

            form = self.vreg.select_object('forms', 'edition', self.req, self.rset,

                                           row=row, attrcategories=('primary',),

                                           mainform=False)

            # XXX rely on the EntityCompositeFormRenderer to put the eid input

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

            self.form_add_subform(form)