"""Specific views for schema related entities

: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"

from itertools import cycle

from logilab.mtconverter import xml_escape

from yams import schema2dot as s2d

from cubicweb.selectors import implements, yes

from cubicweb.schema import META_RELATIONS_TYPES, SCHEMA_TYPES

from cubicweb.schemaviewer import SchemaViewer

from cubicweb.view import EntityView, StartupView

from cubicweb.common import tags, uilib

from cubicweb.web import action

from cubicweb.web.views import TmpFileViewMixin, primary, baseviews, tabs

from cubicweb.web.facet import AttributeFacet

SKIP_TYPES = set()

SKIP_TYPES.update(META_RELATIONS_TYPES)

SKIP_TYPES.update(SCHEMA_TYPES)

def skip_types(req):

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

    return ()

class ViewSchemaAction(action.Action):

    id = 'schema'

    __select__ = yes()

    title = _("site schema")

    category = 'siteactions'

    order = 30

    def url(self):

        return self.build_url(self.id)

class CWRDEFPrimaryView(primary.PrimaryView):

    __select__ = implements('CWAttribute', 'CWRelation')

    cache_max_age = 60*60*2 # stay in http cache for 2 hours by default

    def render_entity_title(self, entity):

        self.w(u'<h1><span class="etype">%s</span> %s</h1>'

               % (entity.dc_type().capitalize(),

                  xml_escape(entity.dc_long_title())))

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

class CWETypeOneLineView(baseviews.OneLineView):

    __select__ = implements('CWEType')

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

        entity = self.entity(row, col)

        final = entity.final

        if final:

            self.w(u'<em class="finalentity">')

        super(CWETypeOneLineView, self).cell_call(row, col, **kwargs)

        if final:

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

class CWETypePrimaryView(tabs.TabsMixin, primary.PrimaryView):

    __select__ = implements('CWEType')

    title = _('in memory entity schema')

    main_related_section = False

    tabs = [_('cwetype-schema-text'), _('cwetype-schema-image'),

            _('cwetype-schema-permissions'), _('cwetype-workflow')]

    default_tab = 'cwetype-schema-text'

    def render_entity(self, entity):

        self.render_entity_title(entity)

        self.w(u'<div>%s</div>' % entity.description)

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

class CWETypeSTextView(EntityView):

    id = 'cwetype-schema-text'

    __select__ = EntityView.__select__ & implements('CWEType')

    def cell_call(self, row, col):

        entity = self.entity(row, col)

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

        rset = self.req.execute('Any N,F,D,I,J,DE,A '

                                'ORDERBY AA WHERE A is CWAttribute, '

                                'A ordernum AA, A defaultval D, '

                                'A description DE, '

                                'A fulltextindexed I, A internationalizable J, '

                                'A relation_type R, R name N, '

                                'A to_entity O, O name F, '

                                'A from_entity S, S eid %(x)s',

                                {'x': entity.eid})

        self.wview('editable-table', rset, 'null', displayfilter=True)

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

        rset = self.req.execute(

            'Any R,C,TT,K,D,A,RN,TTN ORDERBY RN '

            'WHERE A is CWRelation, A description D, A composite K?, '

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

            'A cardinality C, A from_entity S, S eid %(x)s',

            {'x': entity.eid})

        self.wview('editable-table', rset, 'null', displayfilter=True,

                   displaycols=range(6), mainindex=5)

        rset = self.req.execute(

            'Any R,C,TT,K,D,A,RN,TTN ORDERBY RN '

            'WHERE A is CWRelation, A description D, A composite K?, '

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

            'A cardinality C, A to_entity O, O eid %(x)s',

            {'x': entity.eid})

        self.wview('editable-table', rset, 'null', displayfilter=True,

                   displaycols=range(6), mainindex=5)

class CWETypeSImageView(EntityView):

    id = 'cwetype-schema-image'

    __select__ = EntityView.__select__ & implements('CWEType')

    def cell_call(self, row, col):

        entity = self.entity(row, col)

        url = entity.absolute_url(vid='schemagraph')

        self.w(u'<img src="%s" alt="%s"/>' % (

            xml_escape(url),

            xml_escape(self.req._('graphical schema for %s') % entity.name)))

class CWETypeSPermView(EntityView):

    id = 'cwetype-schema-permissions'

    __select__ = EntityView.__select__ & implements('CWEType')

    def cell_call(self, row, col):

        entity = self.entity(row, col)

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

        rset = self.req.execute('Any P WHERE X add_permission P, '

                                'X eid %(x)s',

                                {'x': entity.eid})

        self.wview('outofcontext', rset, 'null')

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

        rset = self.req.execute('Any P WHERE X read_permission P, '

                                'X eid %(x)s',

                                {'x': entity.eid})

        self.wview('outofcontext', rset, 'null')

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

        rset = self.req.execute('Any P WHERE X update_permission P, '

                                'X eid %(x)s',

                                {'x': entity.eid})

        self.wview('outofcontext', rset, 'null')

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

        rset = self.req.execute('Any P WHERE X delete_permission P, '

                                'X eid %(x)s',

                                {'x': entity.eid})

        self.wview('outofcontext', rset, 'null')

class CWETypeSWorkflowView(EntityView):

    id = 'cwetype-workflow'

    __select__ = EntityView.__select__ & implements('CWEType')

    def cell_call(self, row, col):

        entity = self.entity(row, col)

        if entity.reverse_state_of:

            self.w(u'<img src="%s" alt="%s"/>' % (

                    xml_escape(entity.absolute_url(vid='ewfgraph')),

                    xml_escape(self.req._('graphical workflow for %s') % entity.name)))

        else:

            self.w(u'<p>%s</p>' % _('There is no workflow defined for this entity.'))

# CWRType ######################################################################

class CWRTypeSchemaView(primary.PrimaryView):

    __select__ = implements('CWRType')

    title = _('in memory relation schema')

    main_related_section = False

    def render_entity_attributes(self, entity):

        super(CWRTypeSchemaView, self).render_entity_attributes(entity)

        rschema = self.vreg.schema.rschema(entity.name)

        viewer = SchemaViewer(self.req)

        layout = viewer.visit_relationschema(rschema)

        self.w(uilib.ureport_as_html(layout))

        if not rschema.is_final():

            msg = self.req._('graphical schema for %s') % entity.name

            self.w(tags.img(src=entity.absolute_url(vid='schemagraph'),

                            alt=msg))

# schema images ###############################################################

class RestrictedSchemaVisitorMixIn(object):

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

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

                and rschema.has_local_role('read') or rschema.has_perm(self.req, 'read'))

                and rschema.has_local_role('read') or rschema.has_perm(self.req, 'read'))

class FullSchemaVisitor(RestrictedSchemaVisitorMixIn, s2d.FullSchemaVisitor):

    pass

class OneHopESchemaVisitor(RestrictedSchemaVisitorMixIn,

                           s2d.OneHopESchemaVisitor):

    pass

class OneHopRSchemaVisitor(RestrictedSchemaVisitorMixIn,

                           s2d.OneHopRSchemaVisitor):

    pass

class SchemaImageView(TmpFileViewMixin, StartupView):

    id = 'schemagraph'

    content_type = 'image/png'

    def _generate(self, tmpfile):

        """display global schema information"""

        visitor = FullSchemaVisitor(self.req, self.schema,

                                    skiptypes=skip_types(self.req))

        s2d.schema2dot(outputfile=tmpfile, visitor=visitor)

class CWETypeSchemaImageView(TmpFileViewMixin, EntityView):

    id = 'schemagraph'

    __select__ = implements('CWEType')

    content_type = 'image/png'

    def _generate(self, tmpfile):

        """display schema information for an entity"""

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

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

        visitor = OneHopESchemaVisitor(self.req, eschema,

                                       skiptypes=skip_types(self.req))

        s2d.schema2dot(outputfile=tmpfile, visitor=visitor)

class CWRTypeSchemaImageView(CWETypeSchemaImageView):

    __select__ = implements('CWRType')

    def _generate(self, tmpfile):

        """display schema information for an entity"""

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

        rschema = self.vreg.schema.rschema(entity.name)

        visitor = OneHopRSchemaVisitor(self.req, rschema)

        s2d.schema2dot(outputfile=tmpfile, visitor=visitor)

### facets

class CWFinalFacet(AttributeFacet):

    id = 'cwfinal-facet'

    __select__ = AttributeFacet.__select__ & implements('CWEType', 'CWRType')

    rtype = 'final'