# copyright 2003-2010 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/>.

"""the 'reedit' feature (eg edit attribute/relation from primary view)

"""

import copy

from logilab.mtconverter import xml_escape

from logilab.common.deprecation import deprecated

from cubicweb import neg_role

from cubicweb.schema import display_name

from cubicweb.utils import json_dumps

from cubicweb.selectors import non_final_entity, match_kwargs

from cubicweb.view import EntityView

from cubicweb.web import uicfg, stdmsgs

from cubicweb.web.form import FieldNotFound

from cubicweb.web.formwidgets import Button, SubmitButton

class _DummyForm(object):

    __slots__ = ('event_args',)

    def form_render(self, **_args):

        return u''

    def render(self, *_args, **_kwargs):

        return u''

    def append_field(self, *args):

        pass

rctrl = uicfg.reledit_ctrl

class ClickAndEditFormView(EntityView):

    __regid__ = 'doreledit'

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

    # ui side continuations

    _onclick = (u"cw.reledit.loadInlineEditionForm('%(formid)s', %(eid)s, '%(rtype)s', '%(role)s', "

                "'%(divid)s', %(reload)s, '%(vid)s', '%(default_value)s');")

    _cancelclick = "cw.reledit.cleanupAfterCancel('%s')"

    # ui side actions/buttons

    _addzone = u'<img title="%(msg)s" src="data/plus.png" alt="%(msg)s"/>'

    _addmsg = _('click to add a value')

    _deletezone = u'<img title="%(msg)s" src="data/cancel.png" alt="%(msg)s"/>'

    _deletemsg = _('click to delete this value')

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

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

    # default relation vids according to cardinality

    # can be changed per rtype using reledit_ctrl rtag

    _one_rvid = 'incontext'

    _many_rvid = 'csv'

    # renderer

    _form_renderer_id = 'base'

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

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

                                # boolean, eid (to redirect), or

                                # function taking the subject entity & returning a boolean or an eid

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

                  default_value=None,

                  formid='base'

                  ):

        """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_css('cubicweb.form.css')

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

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

        rschema = self._cw.vreg.schema[rtype]

        self._rules = rctrl.etype_get(entity.e_schema.type, rschema.type, role, '*')

        reload = self._compute_reload(entity, rschema, role, reload)

        default_value = self._compute_default_value(entity, rschema, role, default_value)

        divid = self._build_divid(rtype, role, entity.eid)

        if rschema.final:

            self._handle_attribute(entity, rschema, role, divid, reload, default_value)

        else:

            if self._is_composite():

                self._handle_composite(entity, rschema, role, divid, reload, default_value, formid)

            else:

                self._handle_relation(entity, rschema, role, divid, reload, default_value, formid)

    def _handle_attribute(self, entity, rschema, role, divid, reload, default_value):

        rtype = rschema.type

        value = entity.printable_value(rtype)

        if not self._should_edit_attribute(entity, rschema):

            self.w(value)

            return

        display_label, related_entity = self._prepare_form(entity, rtype, role)

        form, renderer = self._build_form(entity, rtype, role, divid, 'base', default_value,

                                          reload, display_label, related_entity)

        value = value or default_value

        self.view_form(divid, value, form, renderer)

    def _compute_formid_value(self, entity, rschema, role, default_value, rvid, formid):

        related_rset = entity.related(rschema.type, role)

        if related_rset:

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

        else:

            value = default_value

        if not self._should_edit_relation(entity, rschema, role):

            return None, value

        return formid, value

    def _handle_relation(self, entity, rschema, role, divid, reload, default_value, formid):

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

        formid, value = self._compute_formid_value(entity, rschema, role, default_value, rvid, formid)

        if formid is None:

            return self.w(value)

        rtype = rschema.type

        display_label, related_entity = self._prepare_form(entity, rtype, role)

        form, renderer = self._build_form(entity, rtype, role, divid, formid, default_value, reload,

                                          display_label, related_entity, dict(vid=rvid))

        self.view_form(divid, value, form, renderer)

    def _handle_composite(self, entity, rschema, role, divid, reload, default_value, formid):

        # this is for attribute-like composites (1 target type, 1 related entity at most, for now)

        ttypes = self._compute_ttypes(rschema, role)

        related_rset = entity.related(rschema.type, role)

        add_related = self._may_add_related(related_rset, entity, rschema, role, ttypes)

        edit_related = self._may_edit_related_entity(related_rset, entity, rschema, role, ttypes)

        delete_related = edit_related and self._may_delete_related(related_rset, entity, rschema, role)

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

        formid, value = self._compute_formid_value(entity, rschema, role, default_value, rvid, formid)

        if formid is None or not (edit_related or add_related):

            # till we learn to handle cases where not (edit_related or add_related)

            self.w(value)

            return

        rtype = rschema.type

        ttype = ttypes[0]

        _fdata = self._prepare_composite_form(entity, rtype, role, edit_related, add_related and ttype)

        display_label, related_entity = _fdata

        form, renderer = self._build_form(entity, rtype, role, divid, formid, default_value, reload,

                                          display_label, related_entity, dict(vid=rvid))

        self.view_form(divid, value, form, renderer,

                       edit_related, add_related, delete_related)

    def _compute_best_vid(self, eschema, rschema, role):

        rvid = self._one_rvid

        if eschema.rdef(rschema, role).role_cardinality(role) in '+*':

            rvid = self._many_rvid

        return self._rules.get('rvid', rvid)

    def _compute_ttypes(self, rschema, role):

        dual_role = neg_role(role)

        return getattr(rschema, '%ss' % dual_role)()

    def _compute_reload(self, entity, rschema, role, reload):

        ctrl_reload = self._rules.get('reload', reload)

        if callable(ctrl_reload):

            ctrl_reload = ctrl_reload(entity)

        if isinstance(ctrl_reload, int) and ctrl_reload > 1: # not True/False

            ctrl_reload = self._cw.build_url(ctrl_reload)

        return ctrl_reload

    def _compute_default_value(self, entity, rschema, role, default_value):

        etype = entity.e_schema.type

        ctrl_default = self._rules.get('default_value', default_value)

        if ctrl_default:

            return ctrl_default

        if default_value is None:

            return xml_escape(self._cw._('<%s not specified>') %

                              display_name(self._cw, rschema.type, role))

        return default_value

    def _is_composite(self):

        return self._rules.get('edit_target') == 'related'

    def _may_add_related(self, related_rset, entity, rschema, role, ttypes):

        """ ok for attribute-like composite entities """

        if len(ttypes) > 1: # many etypes: learn how to do it

            return False

        rdef = rschema.role_rdef(entity.e_schema, ttypes[0], role)

        card = rdef.role_cardinality(role)

        if related_rset or card not in '?1':

            return False

        if role == 'subject':

            kwargs = {'fromeid': entity.eid}

        else:

            kwargs = {'toeid': entity.eid}

        return rdef.has_perm(self._cw, 'add', **kwargs)

    def _may_edit_related_entity(self, related_rset, entity, rschema, role, ttypes):

        """ controls the edition of the related entity """

        if len(ttypes) > 1 or len(related_rset.rows) != 1:

            return False

        if entity.e_schema.rdef(rschema, role).role_cardinality(role) not in '?1':

            return False

        return related_rset.get_entity(0, 0).cw_has_perm('update')

    def _may_delete_related(self, related_rset, entity, rschema, role):

        # we assume may_edit_related, only 1 related entity

        if not related_rset:

            return False

        rentity = related_rset.get_entity(0, 0)

        if role == 'subject':

            kwargs = {'fromeid': entity.eid, 'toeid': rentity.eid}

        else:

            kwargs = {'fromeid': rentity.eid, 'toeid': entity.eid}

        # NOTE: should be sufficient given a well built schema/security

        return rschema.has_perm(self._cw, 'delete', **kwargs)

    def _build_edit_zone(self):

        return self._editzone % {'msg' : xml_escape(_(self._cw._(self._editzonemsg)))}

    def _build_delete_zone(self):

        return self._deletezone % {'msg': xml_escape(self._cw._(self._deletemsg))}

    def _build_add_zone(self):

        return self._addzone % {'msg': xml_escape(self._cw._(self._addmsg))}

    def _build_divid(self, rtype, role, entity_eid):

        """ builds an id for the root div of a reledit widget """

        return '%s-%s-%s' % (rtype, role, entity_eid)

    def _build_args(self, entity, rtype, role, formid, default_value, reload,

                    extradata=None):

        divid = self._build_divid(rtype, role, entity.eid)

        event_args = {'divid' : divid, 'eid' : entity.eid, 'rtype' : rtype, 'formid': formid,

                      'reload' : json_dumps(reload), 'default_value' : default_value,

                      'role' : role, 'vid' : u''}

        if extradata:

            event_args.update(extradata)

        return event_args

    def _prepare_form(self, entity, _rtype, role):

        display_label = False

        related_entity = entity

        return display_label, related_entity

    def _prepare_composite_form(self, entity, rtype, role, edit_related, add_related):

        if edit_related and not add_related:

            display_label = True

            related_entity = entity.related(rtype, role).get_entity(0, 0)

        elif add_related:

            display_label = True

            _new_entity = self._cw.vreg['etypes'].etype_class(add_related)(self._cw)

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

            related_entity = _new_entity

            # XXX see forms.py ~ 276 and entities.linked_to method

            #     is there another way ?

            self._cw.form['__linkto'] = '%s:%s:%s' % (rtype, entity.eid, neg_role(role))

        return display_label, related_entity

    def _build_renderer(self, related_entity, display_label):

        return self._cw.vreg['formrenderers'].select(

            self._form_renderer_id, self._cw, entity=related_entity,

            display_label=display_label,

            table_class='attributeForm' if display_label else '',

            display_help=False, button_bar_class='buttonbar',

            display_progress_div=False)

    def _build_form(self, entity, rtype, role, divid, formid, default_value, reload,

                    display_label, related_entity, extradata=None, **formargs):

        event_args = self._build_args(entity, rtype, role, formid, default_value,

                                      reload, extradata)

        cancelclick = self._cancelclick % divid

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

            formid, self._cw, rset=related_entity.as_rset(), entity=related_entity,

            domid='%s-form' % divid, formtype='inlined',

            action=self._cw.build_url('validateform', __onsuccess='window.parent.cw.reledit.onSuccess'),

            cwtarget='eformframe', cssclass='releditForm',

            **formargs)

        # pass reledit arguments

        for pname, pvalue in event_args.iteritems():

            form.add_hidden('__reledit|' + pname, pvalue)

        # handle buttons

        if form.form_buttons: # edition, delete

            form_buttons = []

            for button in form.form_buttons:

                if not button.label.endswith('apply'):

                    if button.label.endswith('cancel'):

                        button = copy.deepcopy(button)

                        button.cwaction = None

                        button.onclick = cancelclick

                    form_buttons.append(button)

            form.form_buttons = form_buttons

        else: # base

            form.form_buttons = [SubmitButton(),

                                 Button(stdmsgs.BUTTON_CANCEL, onclick=cancelclick)]

        form.event_args = event_args

        if formid == 'base':

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

            form.append_field(field)

        return form, self._build_renderer(related_entity, display_label)

    def _should_edit_attribute(self, entity, rschema):

        rdef = entity.e_schema.rdef(rschema)

        # check permissions

        if not entity.cw_has_perm('update'):

            return False

        rdef = entity.e_schema.rdef(rschema)

        return rdef.has_perm(self._cw, 'update', eid=entity.eid)

    should_edit_attributes = deprecated('[3.9] should_edit_attributes is deprecated,'

                                        ' use _should_edit_attribute instead',

                                        _should_edit_attribute)

    def _should_edit_relation(self, entity, rschema, role):

        return rschema.has_perm(self._cw, 'add', **perm_args)

    should_edit_relations = deprecated('[3.9] should_edit_relations is deprecated,'

                                       ' use _should_edit_relation instead',

                                       _should_edit_relation)

        w = self.w

        w(u'<div id="%(id)s-reledit" onmouseout="%(out)s" onmouseover="%(over)s" class="%(css)s">' %

          {'id': divid, 'css': 'releditField',

           'out': "jQuery('#%s').addClass('hidden')" % divid,

           'over': "jQuery('#%s').removeClass('hidden')" % divid})

        w(u'<div id="%s-value" class="editableFieldValue">' % divid)

        w(value)

        w(u'</div>')

        w(form.render(renderer=renderer))

        w(u'<div id="%s" class="editableField hidden">' % divid)