from ldt.ldt_utils.projectserializer import ProjectSerializer

import ldt.auth as ldt_auth

import logging

import lxml.etree

def project_annotations_rdf(request, ldt_id):

    project = Project.safe_objects.get(ldt_id=ldt_id); #@UndefinedVariable

    if not ldt_auth.check_access(request.user, project):

        return HttpResponseForbidden(_("You can not access this project"))

    mimetype = request.REQUEST.get("mimetype")

    if mimetype is None:

        mimetype = "application/rdf+xml; charset=utf-8"

    else:

        mimetype = mimetype.encode("utf-8")

    if "charset" not in mimetype:

        mimetype += "; charset=utf-8" 

    resp = HttpResponse(mimetype=mimetype)

    resp['Cache-Control'] = 'no-cache, must-revalidate'

    resp['Pragma'] = 'no-cache'

    ps = ProjectSerializer(project, from_contents=False, from_display=True) 

    annotations = ps.get_annotations(first_cutting=True)

    rdf_ns = u"http://www.w3.org/1999/02/22-rdf-syntax-ns#"

    dc_ns = u"http://purl.org/dc/elements/1.1/"

    rdf = u"{%s}" % rdf_ns

    dc = u"{%s}" % dc_ns

    nsmap = {u'rdf' : rdf_ns, u'dc':dc_ns}

    rdf_root = lxml.etree.Element(rdf + u"RDF", nsmap=nsmap)

    logging.debug("RDF annotations : " + repr(annotations)) #@UndefinedVariable

    for annotation in annotations:

        uri = u""

        if 'uri' in annotation and annotation['uri']:

            uri = unicode(annotation['uri'])

        annot_desc = lxml.etree.SubElement(rdf_root, rdf + u"Description")

        annot_desc.set(rdf + u'about', uri)

        if annotation['title']:

            lxml.etree.SubElement(annot_desc, dc + 'title').text = lxml.etree.CDATA(unicode(annotation['title']))

        if annotation['desc']:

            lxml.etree.SubElement(annot_desc, dc + 'description').text = lxml.etree.CDATA(unicode(annotation['desc']))

        if annotation['tags']:

            for tag in annotation['tags']:

                lxml.etree.SubElement(annot_desc, dc + 'subject').text = lxml.etree.CDATA(unicode(tag))

        lxml.etree.SubElement(annot_desc, dc + 'coverage').text = u"start=%s, duration=%s" % (annotation['begin'], annotation['duration'])

    resp.write(u"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n")

    resp.write(u"<!DOCTYPE rdf:RDF PUBLIC \"-//DUBLIN CORE//DCMES DTD 2002/07/31//EN\" \"http://dublincore.org/documents/2002/07/31/dcmes-xml/dcmes-xml-dtd.dtd\">\n")

    resp.write(lxml.etree.tostring(rdf_root, xml_declaration=False, encoding="utf-8", pretty_print=True))

    return resp