# copyright 2003-2012 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/>.

"""Specific views for schema related entities"""

from cubicweb import _

from itertools import cycle

import tempfile

import os, os.path as osp

import codecs

from logilab.common.graph import GraphGenerator, DotBackend

from logilab.common.ureports import Section, Table

from logilab.common.registry import yes

from logilab.mtconverter import xml_escape

from yams import BASE_TYPES, schema2dot as s2d

from yams.buildobjs import DEFAULT_ATTRPERMS

from cubicweb.predicates import (is_instance, match_user_groups, match_kwargs,

                                has_related_entities, authenticated_user)

from cubicweb.schema import (META_RTYPES, SCHEMA_TYPES, SYSTEM_RTYPES,

                             WORKFLOW_TYPES, INTERNAL_TYPES)

from cubicweb.utils import make_uid

from cubicweb.view import EntityView, StartupView

from cubicweb import tags, uilib

from cubicweb.web import action, facet, schemaviewer

from cubicweb.web.views import uicfg, primary, baseviews, tabs, tableview, ibreadcrumbs

ALWAYS_SKIP_TYPES = BASE_TYPES | SCHEMA_TYPES

SKIP_TYPES  = (ALWAYS_SKIP_TYPES | META_RTYPES | SYSTEM_RTYPES | WORKFLOW_TYPES

               | INTERNAL_TYPES)

SKIP_TYPES.update(set(('CWUser', 'CWGroup', 'EmailAddress', 'Bookmark')))

def skip_types(req):

    if int(req.form.get('skipmeta', True)):

        return SKIP_TYPES

    return ALWAYS_SKIP_TYPES

_pvs = uicfg.primaryview_section

_pvdc = uicfg.primaryview_display_ctrl

for _action in ('read', 'add', 'update', 'delete'):

    _pvs.tag_subject_of(('*', '%s_permission' % _action, '*'), 'hidden')

    _pvs.tag_object_of(('*', '%s_permission' % _action, '*'), 'hidden')

for _etype in ('CWEType', 'CWRType', 'CWAttribute', 'CWRelation'):

    _pvdc.tag_attribute((_etype, 'description'), {'showlabel': False})

_pvs.tag_attribute(('CWEType', 'name'), 'hidden')

_pvs.tag_attribute(('CWEType', 'final'), 'hidden')

_pvs.tag_object_of(('*', 'workflow_of', 'CWEType'), 'hidden')

_pvs.tag_subject_of(('CWEType', 'default_workflow', '*'), 'hidden')

_pvs.tag_object_of(('*', 'specializes', 'CWEType'), 'hidden')

_pvs.tag_subject_of(('CWEType', 'specializes', '*'), 'hidden')

_pvs.tag_object_of(('*', 'from_entity', 'CWEType'), 'hidden')

_pvs.tag_object_of(('*', 'to_entity', 'CWEType'), 'hidden')

_pvs.tag_attribute(('CWRType', 'name'), 'hidden')

_pvs.tag_attribute(('CWRType', 'final'), 'hidden')

_pvs.tag_object_of(('*', 'relation_type', 'CWRType'), 'hidden')

_pvs.tag_subject_of(('CWAttribute', 'constrained_by', '*'), 'hidden')

_pvs.tag_subject_of(('CWRelation', 'constrained_by', '*'), 'hidden')

class SecurityViewMixIn(object):

    """mixin providing methods to display security information for a entity,

    relation or relation definition schema

    """

    cssclass = "listing schemaInfo"

    def permissions_table(self, erschema, permissions=None):

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

        w = self.w

        _ = self._cw._

        w(u'<table class="%s">' % self.cssclass)

        w(u'<tr><th>%s</th><th>%s</th><th>%s</th></tr>' % (

            _("permission"), _('granted to groups'), _('rql expressions')))

        for action in erschema.ACTIONS:

            w(u'<tr><td>%s</td><td>' % _(action))

            if permissions is None:

                groups = erschema.get_groups(action)

                rqlexprs = sorted(e.expression for e in erschema.get_rqlexprs(action))

            else:

                groups = permissions[action][0]

                rqlexprs = permissions[action][1]

            # XXX get group entity and call it's incontext view

            groups = [u'<a class="%s" href="%s">%s</a>' % (

                group, self._cw.build_url('cwgroup/%s' % group), label)

                      for label, group in sorted((_(g), g) for g in groups)]

            w(u'<br/>'.join(groups))

            w(u'</td><td>')

            w(u'<br/>'.join(rqlexprs))

            w(u'</td></tr>\n')

        w(u'</table>')

    def grouped_permissions_table(self, rschema):

        # group relation definitions with identical permissions

        perms = {}

        for rdef in rschema.rdefs.values():

            rdef_perms = []

            for action in rdef.ACTIONS:

                groups = sorted(rdef.get_groups(action))

                exprs = sorted(e.expression for e in rdef.get_rqlexprs(action))

                rdef_perms.append( (action, (tuple(groups), tuple(exprs))) )

            rdef_perms = tuple(rdef_perms)

            if rdef_perms in perms:

                perms[rdef_perms].append( (rdef.subject, rdef.object) )

            else:

                perms[rdef_perms] = [(rdef.subject, rdef.object)]

        # set layout permissions in a table for each group of relation

        # definition

        w = self.w

        _ = self._cw._

        w(u'<div style="margin: 0px 1.5em">')

        tmpl = u'<strong>%s</strong> %s <strong>%s</strong>'

        for perm, rdefs in perms.items():

            w(u'<div>%s</div>' % u', '.join(

                tmpl % (_(s.type), _(rschema.type), _(o.type)) for s, o in rdefs))

            # accessing rdef from previous loop by design: only used to get

            # ACTIONS

            self.permissions_table(rdef, dict(perm))

        w(u'</div>')

# global schema view ###########################################################

class SchemaView(tabs.TabsMixin, StartupView):

    """display schema information (graphically, listing tables...) in tabs"""

    __regid__ = 'schema'

    title = _('data model schema')

    tabs = [_('schema-diagram'), _('schema-entity-types'),

            _('schema-relation-types')]

    default_tab = 'schema-diagram'

    def call(self):

        self.w(u'<h1>%s</h1>' % self._cw._(self.title))

        self.render_tabs(self.tabs, self.default_tab)

class SchemaImageTab(StartupView):

    __regid__ = 'schema-diagram'

    def call(self):

        _ = self._cw._

        self.w(self._cw._(

            u'<div>This schema of the data model <em>excludes</em> the '

            'meta-data, but you can also display a <a href="%s">complete '

            'schema with meta-data</a>.</div>')

               % xml_escape(self._cw.build_url('view', vid='schemagraph', skipmeta=0)))

        self.w(u'<div><a href="%s">%s</a></div>' %

               (self._cw.build_url('view', vid='owl'),

                self._cw._(u'Download schema as OWL')))

        self.wview('schemagraph')

class SchemaETypeTab(StartupView):

    __regid__ = 'schema-entity-types'

    def call(self):

        self.wview('table', self._cw.execute(

            'Any X ORDERBY N WHERE X is CWEType, X name N, X final FALSE'))

class SchemaRTypeTab(StartupView):

    __regid__ = 'schema-relation-types'

    def call(self):

        self.wview('table', self._cw.execute(

            'Any X ORDERBY N WHERE X is CWRType, X name N, X final FALSE'))

# CWEType ######################################################################

# register msgid generated in entity relations tables

_('i18ncard_1'), _('i18ncard_?'), _('i18ncard_+'), _('i18ncard_*')

class CWETypePrimaryView(tabs.TabbedPrimaryView):

    __select__ = is_instance('CWEType')

    tabs = [_('cwetype-description'), _('cwetype-box'), _('cwetype-workflow'),

            _('cwetype-views'), _('cwetype-permissions')]

    default_tab = 'cwetype-description'

class CWETypeDescriptionTab(tabs.PrimaryTab):

    __regid__ = 'cwetype-description'

    __select__ = tabs.PrimaryTab.__select__ & is_instance('CWEType')

    def render_entity_attributes(self, entity):

        super(CWETypeDescriptionTab, self).render_entity_attributes(entity)

        _ = self._cw._

        # inheritance

        if entity.specializes:

            self.w(u'<div><strong>%s</strong>' % _('Parent class:'))

            self.wview('csv', entity.related('specializes', 'subject'))

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

        if entity.reverse_specializes:

            self.w(u'<div><strong>%s</strong>' % _('Sub-classes:'))

            self.wview('csv', entity.related('specializes', 'object'))

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

        # entity schema image

        self.wview('schemagraph', etype=entity.name)

        # entity schema attributes

        self.w(u'<h2>%s</h2>' % _('CWAttribute_plural'))

        rset = self._cw.execute(

            'Any A,ON,D,C,A,DE,A, IDX,FTI,I18N,R,O,RN,S ORDERBY AA '

            'WHERE A is CWAttribute, A from_entity S, S eid %(x)s, '

            'A ordernum AA, A defaultval D, A description DE, A cardinality C, '

            'A fulltextindexed FTI, A internationalizable I18N, A indexed IDX, '

            'A relation_type R, R name RN, A to_entity O, O name ON',

            {'x': entity.eid})

        self.wview('table', rset, 'null',

                   cellvids={0: 'rdef-name-cell',

                             2: 'etype-attr-defaultval-cell',

                             3: 'etype-attr-cardinality-cell',

                             4: 'rdef-constraints-cell',

                             6: 'rdef-options-cell'},

                   headers=(_(u'name'), _(u'type'),

                            _(u'default value'), _(u'required'),

                            _(u'constraints'), _(u'description'), _('options')))

        # entity schema relations

        self.w(u'<h2>%s</h2>' % _('CWRelation_plural'))

        cellvids = {0: 'rdef-name-cell',

                    2: 'etype-rel-cardinality-cell',

                    3: 'rdef-constraints-cell',

                    4: 'rdef-options-cell'}

        headers= [_(u'name'), _(u'object type'), _(u'cardinality'),

                  _(u'constraints'), _(u'options')]

        rset = self._cw.execute(

            'Any A,TT,"i18ncard_"+SUBSTRING(C,1,1),A,A, K,TTN,R,RN ORDERBY RN '

            'WHERE A is CWRelation, A from_entity S, S eid %(x)s, '

            'A composite K, A cardinality C, '

            'A relation_type R, R name RN, A to_entity TT, TT name TTN',

            {'x': entity.eid})

        if rset:

            self.w(u'<h5>%s %s</h5>' % (entity.name, _('is subject of:')))

            self.wview('table', rset, cellvids=cellvids, headers=headers)

        rset = self._cw.execute(

            'Any A,TT,"i18ncard_"+SUBSTRING(C,1,1),A,A, K,TTN,R,RN ORDERBY RN '

            'WHERE A is CWRelation, A to_entity O, O eid %(x)s, '

            'A composite K, A cardinality C, '

            'A relation_type R, R name RN, A from_entity TT, TT name TTN',

            {'x': entity.eid})

        if rset:

            cellvids[0] = 'rdef-object-name-cell'

            headers[1] = _(u'subject type')

            self.w(u'<h5>%s %s</h5>' % (entity.name, _('is object of:')))

            self.wview('table', rset, cellvids=cellvids, headers=headers)

class CWETypeAttributeCardinalityCell(baseviews.FinalView):

    __regid__ = 'etype-attr-cardinality-cell'

    def cell_call(self, row, col):

        if self.cw_rset.rows[row][col][0] == '1':

            self.w(self._cw._(u'yes'))

        else:

            self.w(self._cw._(u'no'))

class CWETypeAttributeDefaultValCell(baseviews.FinalView):

    __regid__ = 'etype-attr-defaultval-cell'

    def cell_call(self, row, col):

        defaultval = self.cw_rset.rows[row][col]

        if defaultval is not None:

class CWETypeRelationCardinalityCell(baseviews.FinalView):

    __regid__ = 'etype-rel-cardinality-cell'

    def cell_call(self, row, col):

        self.w(self._cw._(self.cw_rset.rows[row][col]))

class CWETypeBoxTab(EntityView):

    __regid__ = 'cwetype-box'

    __select__ = is_instance('CWEType')

    def cell_call(self, row, col):

        viewer = schemaviewer.SchemaViewer(self._cw)

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

        eschema = self._cw.vreg.schema.eschema(entity.name)

        layout = viewer.visit_entityschema(eschema)

        self.w(uilib.ureport_as_html(layout))

        self.w(u'<br class="clear"/>')

class CWETypePermTab(SecurityViewMixIn, EntityView):

    __regid__ = 'cwetype-permissions'

    __select__ = is_instance('CWEType') & authenticated_user()

    def cell_call(self, row, col):

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

        eschema = self._cw.vreg.schema.eschema(entity.name)

        self.w(u'<h4>%s</h4>' % self._cw._('This entity type permissions:'))

        self.permissions_table(eschema)

        self.w(u'<div style="margin: 0px 1.5em">')

        self.w(u'<h4>%s</h4>' % self._cw._('Attributes permissions:'))

        for attr, etype in  eschema.attribute_definitions():

            if attr not in META_RTYPES:

                rdef = eschema.rdef(attr)

                attrtype = str(rdef.rtype)

                self.w(u'<h4 class="schema">%s (%s)</h4> '

                       % (attrtype, self._cw._(attrtype)))

                self.permissions_table(rdef)

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

class CWETypeWorkflowTab(EntityView):

    __regid__ = 'cwetype-workflow'

    __select__ = (is_instance('CWEType')

                  & has_related_entities('workflow_of', 'object'))

    def cell_call(self, row, col):

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

        if entity.default_workflow:

            wf = entity.default_workflow[0]

            if len(entity.reverse_workflow_of) > 1:

                self.w(u'<h1>%s (%s)</h1>'

                       % (wf.name, self._cw._('default_workflow')))

            self.display_workflow(wf)

            defaultwfeid = wf.eid

        else:

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

                   % self._cw._('There is no default workflow'))

            defaultwfeid = None

        for altwf in entity.reverse_workflow_of:

            if altwf.eid == defaultwfeid:

                continue

            self.w(u'<h1>%s</h1>' % altwf.name)

            self.display_workflow(altwf)

    def display_workflow(self, wf):

        self.w(wf.view('wfgraph'))