# copyright 2003-2013 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/>.

"""This module (``cubicweb.web.views.uicfg``) regroups a set of structures that may be

used to configure various options of the generated web interface.

To configure the interface generation, we use ``RelationTag`` objects.

Index view configuration

````````````````````````

:indexview_etype_section:

   entity type category in the index/manage page. May be one of:

      * ``application``

      * ``system``

      * ``schema``

      * ``subobject`` (not displayed by default)

   By default only entities on the ``application`` category are shown.

.. sourcecode:: python

    from cubicweb.web.views import uicfg

    # force hiding

    uicfg.indexview_etype_section['HideMe'] = 'subobject'

    # force display

    uicfg.indexview_etype_section['ShowMe'] = 'application'

Actions box configuration

`````````````````````````

:actionbox_appearsin_addmenu:

  simple boolean relation tags used to control the "add entity" submenu.

  Relations whose rtag is True will appears, other won't.

.. sourcecode:: python

   # Adds all subjects of the entry_of relation in the add menu of the ``Blog``

   # primary view

   uicfg.actionbox_appearsin_addmenu.tag_object_of(('*', 'entry_of', 'Blog'), True)

"""

from warnings import warn

from six import string_types

from cubicweb import neg_role

from cubicweb.rtags import (RelationTags, RelationTagsBool, RelationTagsSet,

                            RelationTagsDict, NoTargetRelationTagsDict,

                            _ensure_str_key)

from cubicweb.schema import META_RTYPES, INTERNAL_TYPES, WORKFLOW_TYPES

# primary view configuration ##################################################

class PrimaryViewSectionRelationTags(RelationTags):

    """primary view section configuration"""

    __regid__ = 'primaryview_section'

    _allowed_values = frozenset(('attributes', 'relations',

                                 'sideboxes', 'hidden'))

    def _init(self, sschema, rschema, oschema, role):

        if self.get(sschema, rschema, oschema, role) is None:

            rdef = rschema.rdef(sschema, oschema)

            if rschema.final:

                if rschema.meta or sschema.is_metadata(rschema) \

                        or oschema.type in ('Password', 'Bytes'):

                    section = 'hidden'

                else:

                    section = 'attributes'

            else:

                if rdef.role_cardinality(role) in '1+':

                    section = 'attributes'

                elif rdef.composite == neg_role(role):

                    section = 'relations'

                else:

                    section = 'sideboxes'

            self.tag_relation((sschema, rschema, oschema, role), section)

primaryview_section = PrimaryViewSectionRelationTags()

class DisplayCtrlRelationTags(NoTargetRelationTagsDict):

    """primary view display controller configuration"""

    __regid__ = 'primaryview_display_ctrl'

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

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

        self.counter = 0

    def _init(self, sschema, rschema, oschema, role):

        if role == 'subject':

            oschema = '*'

        else:

            sschema = '*'

        self.counter += 1

        self.setdefault((sschema, rschema, oschema, role),

                        'order',

                        self.counter)

    def set_fields_order(self, etype, relations):

        """specify the field order in `etype` primary view.

        :param etype: the entity type as a string

        :param attrs: the ordered list of attribute names (or relations)

        `attrs` can be strings or 2-tuples (relname, role_of_etype_in_the_rel)

        Unspecified fields will be displayed after specified ones, their

        order being consistent with the schema definition.

        Examples:

        .. sourcecode:: python

          from cubicweb.web.views.uicfg import primaryview_display_ctrl as pvdc

          pvdc.set_fields_order('CWUser', ('firstname', ('in_group', 'subject'),

                                           'surname', 'login'))

        """

        for index, relation in enumerate(relations):

            if not isinstance(relation, tuple):

                relation = (relation, 'subject')

            rtype, role = relation

            if role == 'subject':

                self.tag_subject_of((etype, rtype, '*'), {'order': index})

            else:

                self.tag_object_of(('*', rtype, etype), {'order': index})

primaryview_display_ctrl = DisplayCtrlRelationTags()

# index view configuration ####################################################

# entity type section in the index/manage page. May be one of

# * 'application'

# * 'system'

# * 'schema'

# * 'hidden'

# * 'subobject' (not displayed by default)

class InitializableDict(dict): # XXX not a rtag. Turn into an appobject?

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

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

        self.__defaults = dict(self)

    def init(self, schema, check=True):

        self.update(self.__defaults)

        for eschema in schema.entities():

            if eschema.final:

                continue

            if eschema.schema_entity():

                self.setdefault(eschema, 'schema')

            elif eschema in INTERNAL_TYPES or eschema in WORKFLOW_TYPES:

                self.setdefault(eschema, 'system')

            elif eschema.is_subobject(strict=True):

                self.setdefault(eschema, 'subobject')

            else:

                self.setdefault(eschema, 'application')

indexview_etype_section = InitializableDict(

    EmailAddress='subobject',

    Bookmark='system',

    # entity types in the 'system' table by default (managers only)

    CWUser='system', CWGroup='system',

    )

# autoform.AutomaticEntityForm configuration ##################################

def _formsections_as_dict(formsections):

    result = {}

    for formsection in formsections:

        formtype, section = formsection.split('_', 1)

        result[formtype] = section

    return result

def _card_and_comp(sschema, rschema, oschema, role):

    rdef = rschema.rdef(sschema, oschema)

    if role == 'subject':

        card = rdef.cardinality[0]

        composed = not rschema.final and rdef.composite == 'object'

    else:

        card = rdef.cardinality[1]

        composed = not rschema.final and rdef.composite == 'subject'

    return card, composed

class AutoformSectionRelationTags(RelationTagsSet):

    """autoform relations'section"""

    __regid__ = 'autoform_section'

    _allowed_form_types = ('main', 'inlined', 'muledit')

    _allowed_values = {'main': ('attributes', 'inlined', 'relations',

                                'metadata', 'hidden'),

                       'inlined': ('attributes', 'inlined', 'hidden'),

                       'muledit': ('attributes', 'hidden'),

                       }

    def init(self, schema, check=True):

        super(AutoformSectionRelationTags, self).init(schema, check)

        self.apply(schema, self._initfunc_step2)

    def _init(self, sschema, rschema, oschema, role):

        formsections = self.init_get(sschema, rschema, oschema, role)

        if formsections is None:

            formsections = self.tag_container_cls()

        self._tagdefs[key] = formsections

    def _initfunc_step2(self, sschema, rschema, oschema, role):

        formsections = self.get(sschema, rschema, oschema, role)

        sectdict = _formsections_as_dict(formsections)

        if rschema in META_RTYPES:

            sectdict.setdefault('main', 'hidden')

            sectdict.setdefault('muledit', 'hidden')

            sectdict.setdefault('inlined', 'hidden')

        elif role == 'subject' and rschema in sschema.meta_attributes():

            # meta attribute, usually embeded by the described attribute's field

            # (eg RichTextField, FileField...)

            sectdict.setdefault('main', 'hidden')

            sectdict.setdefault('muledit', 'hidden')

            sectdict.setdefault('inlined', 'hidden')

        # ensure we have a tag for each form type

        if not 'main' in sectdict:

                sectdict['main'] = 'metadata'

            else:

                card, composed = _card_and_comp(sschema, rschema, oschema, role)

                if card in '1+':

                    sectdict['main'] = 'attributes'

                    if not 'muledit' in sectdict:

                        sectdict['muledit'] = 'attributes'

                elif rschema.final:

                    sectdict['main'] = 'attributes'

                else:

                    sectdict['main'] = 'relations'

        if not 'muledit' in sectdict:

            sectdict['muledit'] = 'hidden'

            if sectdict['main'] == 'attributes':

                card, composed = _card_and_comp(sschema, rschema, oschema, role)

                if card in '1+' and not composed:

                    sectdict['muledit'] = 'attributes'

        if not 'inlined' in sectdict:

            sectdict['inlined'] = sectdict['main']

        # recompute formsections and set it to avoid recomputing

        for formtype, section in sectdict.items():

            formsections.add('%s_%s' % (formtype, section))

    def tag_relation(self, key, formtype, section):

        if isinstance(formtype, tuple):

            for ftype in formtype:

                self.tag_relation(key, ftype, section)

            return

        assert formtype in self._allowed_form_types, \

               'formtype should be in (%s), not %s' % (

            ','.join(self._allowed_form_types), formtype)

        assert section in self._allowed_values[formtype], \

               'section for %s should be in (%s), not %s' % (

            formtype, ','.join(self._allowed_values[formtype]), section)

        rtags = self._tagdefs.setdefault(_ensure_str_key(key),

                                         self.tag_container_cls())

        # remove previous section for this form type if any

        if rtags:

            for tag in rtags.copy():

                if tag.startswith(formtype):

                    rtags.remove(tag)

        rtags.add('%s_%s' % (formtype, section))

        return rtags

    def init_get(self, stype, rtype, otype, tagged):

        key = (stype, rtype, otype, tagged)

        rtags = {}

        for key in self._get_keys(stype, rtype, otype, tagged):

            tags = self._tagdefs.get(key, ())

            for tag in tags:

                assert '_' in tag, (tag, tags)

                section, value = tag.split('_', 1)

                rtags[section] = value

        cls = self.tag_container_cls

        rtags = cls('_'.join([section,value])

                    for section,value in rtags.items())

        return rtags

    def get(self, *key):

        # overriden to avoid recomputing done in parent classes

        return self._tagdefs.get(key, ())

    def relations_by_section(self, entity, formtype, section, permission,

                             strict=False):

        """return a list of (relation schema, target schemas, role) for the

        given entity matching categories and permission.

        `strict`:

          bool telling if having local role is enough (strict = False) or not

        """

        tag = '%s_%s' % (formtype, section)

        eschema  = entity.e_schema

        cw = entity._cw

        permsoverrides = cw.vreg['uicfg'].select('autoform_permissions_overrides', cw, entity=entity)

        if entity.has_eid():

            eid = entity.eid

        else:

            eid = None

            strict = False

        if permission == 'update':

            assert section in ('attributes', 'metadata', 'hidden')

            relpermission = 'add'

        else:

            assert section not in ('metadata', 'hidden')

            relpermission = permission

        for rschema, targetschemas, role in eschema.relation_definitions(True):

            _targetschemas = []

            for tschema in targetschemas:

                # check section's tag first, potentially lower cost than

                # checking permission which may imply rql queries

                if not tag in self.etype_get(eschema, rschema, role, tschema):

                    continue

                rdef = rschema.role_rdef(eschema, tschema, role)

                if rschema.final:

                    if not rdef.has_perm(cw, permission, eid=eid,

                                         creating=eid is None):

                        continue

                elif strict or not rdef.has_local_role(relpermission):

                    if role == 'subject':

                        if not rdef.has_perm(cw, relpermission, fromeid=eid):

                            continue

                    elif role == 'object':

                        if not rdef.has_perm(cw, relpermission, toeid=eid):

                            continue

                _targetschemas.append(tschema)

            if not _targetschemas:

                continue

            targetschemas = _targetschemas

            rdef = eschema.rdef(rschema, role=role, targettype=targetschemas[0])

            # XXX tag allowing to hijack the permission machinery when

            # permission is not verifiable until the entity is actually

            # created...

            if eid is None and '%s_on_new' % permission in permsoverrides.etype_get(eschema, rschema, role):

                yield (rschema, targetschemas, role)

                continue

            if not rschema.final and role == 'subject':

                # on relation with cardinality 1 or ?, we need delete perm as well

                # if the relation is already set

                if (relpermission == 'add'

                    and rdef.role_cardinality(role) in '1?'

                    and eid and entity.related(rschema.type, role)

                    and not rdef.has_perm(cw, 'delete', fromeid=eid,

                                          toeid=entity.related(rschema.type, role)[0][0])):

                    continue

            elif role == 'object':

                # on relation with cardinality 1 or ?, we need delete perm as well

                # if the relation is already set

                if (relpermission == 'add'

                    and rdef.role_cardinality(role) in '1?'

                    and eid and entity.related(rschema.type, role)

                    and not rdef.has_perm(cw, 'delete', toeid=eid,

                                          fromeid=entity.related(rschema.type, role)[0][0])):

                    continue

            yield (rschema, targetschemas, role)

    def hide_field(self, etype, attr, desttype='*', formtype='main'):

        """hide `attr` in `etype` forms.

        :param etype: the entity type as a string

        :param attr: the name of the attribute or relation to hide

        :param formtype: which form will be affected ('main', 'inlined', etc.),

         *main* by default.

        `attr` can be a string or 2-tuple (relname, role_of_etype_in_the_rel)

        Examples:

        .. sourcecode:: python

          from cubicweb.web.views.uicfg import autoform_section as afs

          afs.hide_field('CWUser', 'login')

          afs.hide_field('*', 'name')

          afs.hide_field('CWUser', 'use_email', formtype='inlined')