"""produces some Ontology Web Language schema and views

"""

__docformat__ = "restructuredtext en"

_ = unicode

from logilab.mtconverter import TransformError, xml_escape

from cubicweb.view import StartupView, EntityView

from cubicweb.selectors import none_rset, match_view

from cubicweb.web.action import Action

from cubicweb.web.views import schema

OWL_CARD_MAP = {'1': '<rdf:type rdf:resource="&owl;FunctionalProperty"/>',

                '?': '<owl:maxCardinality rdf:datatype="&xsd;int">1</owl:maxCardinality>',

                '+': '<owl:minCardinality rdf:datatype="&xsd;int">1</owl:minCardinality>',

                '*': ''

                }

OWL_TYPE_MAP = {'String': 'xsd:string',

                'Datetime': 'xsd:dateTime',

                'Bytes': 'xsd:byte',

                'Float': 'xsd:float',

                'Boolean': 'xsd:boolean',

                'Int': 'xsd:int',

                'Date':'xsd:date',

                'Time': 'xsd:time',

                'Password': 'xsd:byte',

                'Decimal' : 'xsd:decimal',

                'Interval': 'xsd:duration'

                }

OWL_OPENING_ROOT = u'''<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE rdf:RDF [

        <!ENTITY owl "http://www.w3.org/2002/07/owl#" >

        <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >

]>

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"

    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"

    xmlns:xsd="http://www.w3.org/2001/XMLSchema#"

    xmlns:owl="http://www.w3.org/2002/07/owl#"

    xmlns="http://logilab.org/owl/ontologies/%(appid)s#"

    xmlns:%(appid)s="http://logilab.org/owl/ontologies/%(appid)s#"

    xmlns:base="http://logilab.org/owl/ontologies/%(appid)s">

  <owl:Ontology rdf:about="">

    <rdfs:comment>

    %(appid)s Cubicweb OWL Ontology

    </rdfs:comment>

  </owl:Ontology>'''

OWL_CLOSING_ROOT = u'</rdf:RDF>'

class OWLView(StartupView):

    """This view export in owl format schema database. It is the TBOX"""

    __regid__ = 'owl'

    title = _('owl')

    templatable = False

    content_type = 'application/xml' # 'text/xml'

    def call(self, writeprefix=True):

        skipmeta = int(self._cw.form.get('skipmeta', True))

        if writeprefix:

            self.w(OWL_OPENING_ROOT % {'appid': self._cw.vreg.schema.name})

        self.visit_schema(skiptypes=skipmeta and schema.SKIP_TYPES or ())

        if writeprefix:

            self.w(OWL_CLOSING_ROOT)

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

        return not rschema in self.skiptypes and (

            rschema.may_have_permission('read', self._cw, eschema, role))

    def visit_schema(self, skiptypes):

        """get a layout for a whole schema"""

        self.skiptypes = skiptypes

        entities = sorted(eschema for eschema in self._cw.vreg.schema.entities()

                          if not eschema.final or eschema in skiptypes)

        self.w(u'<!-- classes definition -->')

        for eschema in entities:

            self.visit_entityschema(eschema)

            self.w(u'<!-- property definition -->')

            self.visit_property_schema(eschema)

            self.w(u'<!-- datatype property -->')

            self.visit_property_object_schema(eschema)

    def visit_entityschema(self, eschema):

        """get a layout for an entity OWL schema"""

        self.w(u'<owl:Class rdf:ID="%s">'% eschema)

        self.w(u'<!-- relations -->')

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

            if not self.should_display_rschema(eschema, rschema, role):

                continue

            for oeschema in targetschemas:

                card = rschema.role_rdef(eschema, oeschema, role).role_cardinality(role)

                cardtag = OWL_CARD_MAP[card]

                if cardtag:

                    self.w(u'''<rdfs:subClassOf>

 <owl:Restriction>

  <owl:onProperty rdf:resource="#%s"/>

  %s

 </owl:Restriction>

</rdfs:subClassOf>''' % (rschema, cardtag))

        self.w(u'<!-- attributes -->')

        for rschema, aschema in eschema.attribute_definitions():

            if not self.should_display_rschema(eschema, rschema, 'subject'):

                continue

            self.w(u'''<rdfs:subClassOf>

  <owl:Restriction>

   <owl:onProperty rdf:resource="#%s"/>

   <rdf:type rdf:resource="&owl;FunctionalProperty"/>

  </owl:Restriction>

</rdfs:subClassOf>''' % rschema)

        self.w(u'</owl:Class>')

    def visit_property_schema(self, eschema):

        """get a layout for property entity OWL schema"""

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

            if not self.should_display_rschema(eschema, rschema, role):

                continue

            for oeschema in targetschemas:

                self.w(u'''<owl:ObjectProperty rdf:ID="%s">

 <rdfs:domain rdf:resource="#%s"/>

 <rdfs:range rdf:resource="#%s"/>

</owl:ObjectProperty>''' % (rschema, eschema, oeschema.type))

    def visit_property_object_schema(self, eschema):

        for rschema, aschema in eschema.attribute_definitions():

            if not self.should_display_rschema(eschema, rschema, 'subject'):

                continue

            self.w(u'''<owl:DatatypeProperty rdf:ID="%s">

  <rdfs:domain rdf:resource="#%s"/>

  <rdfs:range rdf:resource="%s"/>

</owl:DatatypeProperty>''' % (rschema, eschema, OWL_TYPE_MAP[aschema.type]))

class OWLABOXView(EntityView):

    '''This view represents a part of the ABOX for a given entity.'''

    __regid__ = 'owlabox'

    title = _('owlabox')

    templatable = False

    content_type = 'application/xml' # 'text/xml'

    def call(self):

        self.w(OWL_OPENING_ROOT % {'appid': self._cw.vreg.schema.name})

        for i in xrange(self.cw_rset.rowcount):

            self.cell_call(i, 0)

        self.w(OWL_CLOSING_ROOT)

    def cell_call(self, row, col):

        self.wview('owlaboxitem', self.cw_rset, row=row, col=col)

class OWLABOXItemView(EntityView):

    '''This view represents a part of the ABOX for a given entity.'''

    __regid__ = 'owlaboxitem'

    templatable = False

    content_type = 'application/xml' # 'text/xml'

    def cell_call(self, row, col):

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

        eschema = entity.e_schema

        self.w(u'<%s rdf:ID="%s">' % (eschema, entity.eid))

        self.w(u'<!--attributes-->')

        for rschema, aschema in eschema.attribute_definitions():

            if rschema.meta:

                continue

            rdef = rschema.rdef(eschema, aschema)

            if not rdef.may_have_permission('read', self._cw):

                continue

            aname = rschema.type

            if aname == 'eid':

                continue

            try:

                attr = entity.printable_value(aname, format='text/plain')

                if attr:

                    self.w(u'<%s>%s</%s>' % (aname, xml_escape(attr), aname))

            except TransformError:

                pass

        self.w(u'<!--relations -->')

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

            if rschema.meta:

                continue

            for tschema in targetschemas:

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

                if rdef.may_have_permission('read', self._cw):

                    break

            else:

                # no read perms to any relation of this type. Skip.

                continue

            if role == 'object':

                attr = 'reverse_%s' % rschema.type

            else:

                attr = rschema.type

            for x in getattr(entity, attr):

                self.w(u'<%s>%s %s</%s>' % (attr, x.__regid__, x.eid, attr))

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

class DownloadOWLSchemaAction(Action):

    __regid__ = 'download_as_owl'

    __select__ = none_rset() & match_view('schema')

    category = 'mainactions'

    title = _('download schema as owl')

    def url(self):

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