# Copyright The IETF Trust 2007, All Rights Reserved

import datetime
import os
import re
import tarfile
import urllib
from tempfile import mkstemp
from collections import OrderedDict

import debug                            # pyflakes:ignore

from django import forms
from django.shortcuts import render, render_to_response, redirect
from django.http import HttpResponse, HttpResponseRedirect, HttpResponseForbidden, Http404
from django.contrib import messages
from django.core.urlresolvers import reverse
from django.db.models import Q
from django.template import RequestContext
from django.template.loader import render_to_string
from django.conf import settings
from django.db.models import Max
from django.forms.models import modelform_factory
from django.views.decorators.csrf import ensure_csrf_cookie
from django.forms import ModelForm

from ietf.doc.models import Document, State
from ietf.group.models import Group
from ietf.ietfauth.utils import role_required, has_role
from ietf.meeting.models import Meeting, TimeSlot, Session, Schedule, Room
from ietf.meeting.helpers import get_areas, get_person_by_email, get_schedule_by_name
from ietf.meeting.helpers import build_all_agenda_slices, get_wg_name_list
from ietf.meeting.helpers import get_all_scheduledsessions_from_schedule
from ietf.meeting.helpers import get_modified_from_scheduledsessions
from ietf.meeting.helpers import get_wg_list, find_ads_for_meeting
from ietf.meeting.helpers import get_meeting, get_schedule, agenda_permissions, meeting_updated
from ietf.utils.pipe import pipe

def materials(request, meeting_num=None):
    meeting = get_meeting(meeting_num)

    begin_date = meeting.get_submission_start_date()
    cut_off_date = meeting.get_submission_cut_off_date()
    cor_cut_off_date = meeting.get_submission_correction_date()
    now = datetime.date.today()
    if settings.SERVER_MODE != 'production' and '_testoverride' in request.REQUEST:
        pass
    elif now > cor_cut_off_date:
        return render_to_response("meeting/materials_upload_closed.html", {
            'meeting_num': meeting_num,
            'begin_date': begin_date,
            'cut_off_date': cut_off_date,
            'cor_cut_off_date': cor_cut_off_date
        }, context_instance=RequestContext(request))

    #sessions  = Session.objects.filter(meeting__number=meeting_num, timeslot__isnull=False)
    schedule = get_schedule(meeting, None)
    sessions  = Session.objects.filter(meeting__number=meeting_num, scheduledsession__schedule=schedule).select_related()
    plenaries = sessions.filter(name__icontains='plenary')
    ietf      = sessions.filter(group__parent__type__slug = 'area').exclude(group__acronym='edu')
    irtf      = sessions.filter(group__parent__acronym = 'irtf')
    training  = sessions.filter(group__acronym__in=['edu','iaoc'])
    iab       = sessions.filter(group__parent__acronym = 'iab')

    cache_version = Document.objects.filter(session__meeting__number=meeting_num).aggregate(Max('time'))["time__max"]
    return render_to_response("meeting/materials.html", {
        'meeting_num': meeting_num,
        'plenaries': plenaries, 'ietf': ietf, 'training': training, 'irtf': irtf, 'iab': iab,
        'cut_off_date': cut_off_date,
        'cor_cut_off_date': cor_cut_off_date,
        'submission_started': now > begin_date,
        'cache_version': cache_version,
    }, context_instance=RequestContext(request))

def current_materials(request):
    meetings = Meeting.objects.exclude(number__startswith='interim-').order_by('-number')
    if meetings:
        return redirect(materials, meetings[0].number)
    else:
        raise Http404

def get_user_agent(request):
    if  settings.SERVER_MODE != 'production' and '_testiphone' in request.REQUEST:
        user_agent = "iPhone"
    elif 'user_agent' in request.REQUEST:
        user_agent = request.REQUEST['user_agent']
    elif 'HTTP_USER_AGENT' in request.META:
        user_agent = request.META["HTTP_USER_AGENT"]
    else:
        user_agent = ""
    return user_agent

def ascii_alphanumeric(string):
    return re.match(r'^[a-zA-Z0-9]*$', string)

class SaveAsForm(forms.Form):
    savename = forms.CharField(max_length=16)

@role_required('Area Director','Secretariat')
def agenda_create(request, num=None, owner=None, name=None):
    meeting  = get_meeting(num)
    person   = get_person_by_email(owner)
    schedule = get_schedule_by_name(meeting, person, name)

    if schedule is None:
        # here we have to return some ajax to display an error.
        messages.error("Error: No meeting information for meeting %s owner %s schedule %s available" % (num, owner, name))
        return redirect(edit_agenda, num=num, owner=owner, name=name)

    # authorization was enforced by the @group_require decorator above.

    saveasform = SaveAsForm(request.POST)
    if not saveasform.is_valid():
        messages.info(request, "This name is not valid. Please choose another one.")
        return redirect(edit_agenda, num=num, owner=owner, name=name)

    savedname = saveasform.cleaned_data['savename']

    if not ascii_alphanumeric(savedname):
        messages.info(request, "This name contains illegal characters. Please choose another one.")
        return redirect(edit_agenda, num=num, owner=owner, name=name)

    # create the new schedule, and copy the scheduledsessions
    try:
        sched = meeting.schedule_set.get(name=savedname, owner=request.user.person)
        if sched:
            return redirect(edit_agenda, meeting.number, sched.name)
        else:
            messages.info(request, "Agenda creation failed. Please try again.")
            return redirect(edit_agenda, num=num, owner=owner, name=name)

    except Schedule.DoesNotExist:
        pass

    # must be done
    newschedule = Schedule(name=savedname,
                           owner=request.user.person,
                           meeting=meeting,
                           visible=False,
                           public=False)

    newschedule.save()
    if newschedule is None:
        return HttpResponse(status=500)

    # keep a mapping so that extendedfrom references can be chased.
    mapping = {};
    for ss in schedule.scheduledsession_set.all():
        # hack to copy the object, creating a new one
        # just reset the key, and save it again.
        oldid = ss.pk
        ss.pk = None
        ss.schedule=newschedule
        ss.save()
        mapping[oldid] = ss.pk
        #print "Copying %u to %u" % (oldid, ss.pk)

    # now fix up any extendedfrom references to new set.
    for ss in newschedule.scheduledsession_set.all():
        if ss.extendedfrom is not None:
            oldid = ss.extendedfrom.id
            newid = mapping[oldid]
            #print "Fixing %u to %u" % (oldid, newid)
            ss.extendedfrom = newschedule.scheduledsession_set.get(pk = newid)
            ss.save()


    # now redirect to this new schedule.
    return redirect(edit_agenda, meeting.number, newschedule.owner_email(), newschedule.name)


@role_required('Secretariat')
@ensure_csrf_cookie
def edit_timeslots(request, num=None):

    meeting = get_meeting(num)
    timeslots = meeting.timeslot_set.exclude(location=None).select_related("location", "type")

    time_slices,date_slices,slots = meeting.build_timeslices()

    meeting_base_url = request.build_absolute_uri(meeting.base_url())
    site_base_url = request.build_absolute_uri('/')[:-1] # skip the trailing slash

    rooms = meeting.room_set.order_by("capacity")

    # this import locate here to break cyclic loop.
    from ietf.meeting.ajax import timeslot_roomsurl, AddRoomForm, timeslot_slotsurl, AddSlotForm
    roomsurl  = reverse(timeslot_roomsurl, args=[meeting.number])
    adddayurl = reverse(timeslot_slotsurl, args=[meeting.number])

    return render(request, "meeting/timeslot_edit.html",
                                         {"timeslots": timeslots,
                                          "meeting_base_url": meeting_base_url,
                                          "site_base_url": site_base_url,
                                          "rooms":rooms,
                                          "addroom":  AddRoomForm(),
                                          "roomsurl": roomsurl,
                                          "addday":   AddSlotForm(),
                                          "adddayurl":adddayurl,
                                          "time_slices":time_slices,
                                          "slot_slices": slots,
                                          "date_slices":date_slices,
                                          "meeting":meeting,
                                          "hide_menu": True,
                                      })

class RoomForm(ModelForm):
    class Meta:
        model = Room
        exclude = ('meeting',)

@role_required('Secretariat')
def edit_roomurl(request, num, roomid):
    meeting = get_meeting(num)

    try:
        room = meeting.room_set.get(pk=roomid)
    except Room.DoesNotExist:
        raise Http404("No room %u for meeting %s" % (roomid, meeting.name))

    if request.POST:
        roomform = RoomForm(request.POST, instance=room)
        new_room = roomform.save(commit=False)
        new_room.meeting = meeting
        new_room.save()
        roomform.save_m2m()
        return HttpResponseRedirect( reverse(edit_timeslots, args=[meeting.number]) )

    roomform = RoomForm(instance=room)
    meeting_base_url = request.build_absolute_uri(meeting.base_url())
    site_base_url = request.build_absolute_uri('/')[:-1] # skip the trailing slash
    return render(request, "meeting/room_edit.html",
                                         {"meeting_base_url": meeting_base_url,
                                          "site_base_url": site_base_url,
                                          "editroom":  roomform,
                                          "meeting":meeting,
                                          "hide_menu": True,
                                      })

##############################################################################
#@role_required('Area Director','Secretariat')
# disable the above security for now, check it below.
@ensure_csrf_cookie
def edit_agenda(request, num=None, owner=None, name=None):

    if request.method == 'POST':
        return agenda_create(request, num, owner, name)

    user     = request.user
    meeting  = get_meeting(num)
    person   = get_person_by_email(owner)
    if name is None:
        schedule = meeting.agenda
    else:
        schedule = get_schedule_by_name(meeting, person, name)
    if schedule is None:
        raise Http404("No meeting information for meeting %s owner %s schedule %s available" % (num, owner, name))

    meeting_base_url = request.build_absolute_uri(meeting.base_url())
    site_base_url = request.build_absolute_uri('/')[:-1] # skip the trailing slash

    rooms = meeting.room_set.filter(session_types__slug='session').distinct().order_by("capacity")
    saveas = SaveAsForm()
    saveasurl=reverse(edit_agenda,
                      args=[meeting.number, schedule.owner_email(), schedule.name])

    can_see, can_edit,secretariat = agenda_permissions(meeting, schedule, user)

    if not can_see:
        return HttpResponse(render_to_string("meeting/private_agenda.html",
                                             {"schedule":schedule,
                                              "meeting": meeting,
                                              "meeting_base_url":meeting_base_url,
                                              "hide_menu": True},
                                             RequestContext(request)), status=403, content_type="text/html")

    scheduledsessions = get_all_scheduledsessions_from_schedule(schedule)

    # get_modified_from needs the query set, not the list
    modified = get_modified_from_scheduledsessions(scheduledsessions)

    area_list = get_areas()
    wg_name_list = get_wg_name_list(scheduledsessions)
    wg_list = get_wg_list(wg_name_list)
    ads = find_ads_for_meeting(meeting)
    for ad in ads:
        # set the default to avoid needing extra arguments in templates
        # django 1.3+
        ad.default_hostscheme = site_base_url

    time_slices,date_slices = build_all_agenda_slices(meeting)

    return render(request, "meeting/landscape_edit.html",
                                         {"schedule":schedule,
                                          "saveas": saveas,
                                          "saveasurl": saveasurl,
                                          "meeting_base_url": meeting_base_url,
                                          "site_base_url": site_base_url,
                                          "rooms":rooms,
                                          "time_slices":time_slices,
                                          "date_slices":date_slices,
                                          "modified": modified,
                                          "meeting":meeting,
                                          "area_list": area_list,
                                          "area_directors" : ads,
                                          "wg_list": wg_list ,
                                          "scheduledsessions": scheduledsessions,
                                          "show_inline": set(["txt","htm","html"]),
                                          "hide_menu": True,
                                      })

##############################################################################
#  show the properties associated with an agenda (visible, public)
#    this page uses ajax POST requests to the API
#
AgendaPropertiesForm = modelform_factory(Schedule, fields=('name','visible', 'public'))

@role_required('Area Director','Secretariat')
@ensure_csrf_cookie
def edit_agenda_properties(request, num=None, owner=None, name=None):
    meeting  = get_meeting(num)
    person   = get_person_by_email(owner)
    schedule = get_schedule_by_name(meeting, person, name)
    if schedule is None:
        raise Http404("No meeting information for meeting %s owner %s schedule %s available" % (num, owner, name))
    form     = AgendaPropertiesForm(instance=schedule)

    cansee, canedit, secretariat = agenda_permissions(meeting, schedule, request.user)

    if not (canedit or has_role(request.user,'Secretariat')):
        return HttpResponseForbidden("You may not edit this agenda")
    else:
        return render(request, "meeting/properties_edit.html",
                                             {"schedule":schedule,
                                              "form":form,
                                              "meeting":meeting,
                                              "hide_menu": True,
                                          })

##############################################################################
# show list of agendas.
#

@role_required('Area Director','Secretariat')
@ensure_csrf_cookie
def edit_agendas(request, num=None, order=None):

    #if request.method == 'POST':
    #    return agenda_create(request, num, owner, name)

    meeting = get_meeting(num)
    user = request.user

    schedules = meeting.schedule_set
    if not has_role(user, 'Secretariat'):
        schedules = schedules.filter(visible = True) | schedules.filter(owner = user.person)

    schedules = schedules.order_by('owner', 'name')

    return render(request, "meeting/agenda_list.html",
                                         {"meeting":   meeting,
                                          "schedules": schedules.all(),
                                          "hide_menu": True,
                                          })

@ensure_csrf_cookie
def agenda(request, num=None, name=None, base=None, ext=None):
    base = base if base else 'agenda'
    ext = ext if ext else '.html'
    # This is misleading - urls.py doesn't send ics through here anymore
    mimetype = {
        ".html":"text/html; charset=%s"%settings.DEFAULT_CHARSET,
        ".txt": "text/plain; charset=%s"%settings.DEFAULT_CHARSET,
        ".ics":"text/calendar; charset=%s"%settings.DEFAULT_CHARSET,
        ".csv":"text/csv; charset=%s"%settings.DEFAULT_CHARSET,
    }
    meeting = get_meeting(num)
    schedule = get_schedule(meeting, name)
    if schedule == None:
        base = base.replace("-utc", "")
        return render(request, "meeting/no-"+base+ext, {'meeting':meeting }, content_type=mimetype[ext])

    updated = meeting_updated(meeting)
    filtered_assignments = schedule.assignments.exclude(timeslot__type__in=['lead','offagenda'])
    return render(request, "meeting/"+base+ext, {"schedule":schedule, "filtered_assignments":filtered_assignments, "updated": updated}, content_type=mimetype[ext])

@role_required('Area Director','Secretariat','IAB')
def agenda_by_room(request,num=None):
    meeting = get_meeting(num) 
    schedule = get_schedule(meeting)
    ss_by_day = OrderedDict()
    for day in schedule.scheduledsession_set.dates('timeslot__time','day'):
        ss_by_day[day]=[]
    for ss in schedule.scheduledsession_set.order_by('timeslot__location__functional_name','timeslot__location__name','timeslot__time'):
        day = ss.timeslot.time.date()
        ss_by_day[day].append(ss)
    return render(request,"meeting/agenda_by_room.html",{"meeting":meeting,"ss_by_day":ss_by_day})

@role_required('Area Director','Secretariat','IAB')
def agenda_by_type(request,num=None,type=None):
    meeting = get_meeting(num) 
    schedule = get_schedule(meeting)
    scheduledsessions = schedule.scheduledsession_set.order_by('session__type__slug','timeslot__time')
    if type:
        scheduledsessions = scheduledsessions.filter(session__type__slug=type)
    return render(request,"meeting/agenda_by_type.html",{"meeting":meeting,"scheduledsessions":scheduledsessions})

@role_required('Area Director','Secretariat','IAB')
def agenda_by_type_ics(request,num=None,type=None):
    meeting = get_meeting(num) 
    schedule = get_schedule(meeting)
    scheduledsessions = schedule.scheduledsession_set.order_by('session__type__slug','timeslot__time')
    if type:
        scheduledsessions = scheduledsessions.filter(session__type__slug=type)
    updated = meeting_updated(meeting)
    return render(request,"meeting/agenda.ics",{"schedule":schedule,"updated":updated,"assignments":scheduledsessions},content_type="text/calendar")

def read_agenda_file(num, doc):
    # XXXX FIXME: the path fragment in the code below should be moved to
    # settings.py.  The *_PATH settings should be generalized to format()
    # style python format, something like this:
    #  DOC_PATH_FORMAT = { "agenda": "/foo/bar/agenda-{meeting.number}/agenda-{meeting-number}-{doc.group}*", }
    path = os.path.join(settings.AGENDA_PATH, "%s/agenda/%s" % (num, doc.external_url))
    if os.path.exists(path):
        with open(path) as f:
            return f.read()
    else:
        return None

def session_agenda(request, num, session):
    d = Document.objects.filter(type="agenda", session__meeting__number=num)
    if session == "plenaryt":
        d = d.filter(session__name__icontains="technical", session__slots__type="plenary")
    elif session == "plenaryw":
        d = d.filter(session__name__icontains="admin", session__slots__type="plenary")
    else:
        d = d.filter(session__group__acronym=session)

    if d:
        agenda = d[0]
        content = read_agenda_file(num, agenda) or "Could not read agenda file"
        _, ext = os.path.splitext(agenda.external_url)
        ext = ext.lstrip(".").lower()

        if ext == "txt":
            return HttpResponse(content, content_type="text/plain; charset=%s"%settings.DEFAULT_CHARSET)
        elif ext == "pdf":
            return HttpResponse(content, content_type="application/pdf")
        else:
            return HttpResponse(content)

    raise Http404("No agenda for the %s session of IETF %s is available" % (session, num))

def convert_to_pdf(doc_name):
    inpath = os.path.join(settings.IDSUBMIT_REPOSITORY_PATH, doc_name + ".txt")
    outpath = os.path.join(settings.INTERNET_DRAFT_PDF_PATH, doc_name + ".pdf")

    try:
        infile = open(inpath, "r")
    except IOError:
        return

    t,tempname = mkstemp()
    os.close(t)
    tempfile = open(tempname, "w")

    pageend = 0;
    newpage = 0;
    formfeed = 0;
    for line in infile:
        line = re.sub("\r","",line)
        line = re.sub("[ \t]+$","",line)
        if re.search("\[?[Pp]age [0-9ivx]+\]?[ \t]*$",line):
            pageend=1
            tempfile.write(line)
            continue
        if re.search("^[ \t]*\f",line):
            formfeed=1
            tempfile.write(line)
            continue
        if re.search("^ *INTERNET.DRAFT.+[0-9]+ *$",line) or re.search("^ *Internet.Draft.+[0-9]+ *$",line) or re.search("^draft-[-a-z0-9_.]+.*[0-9][0-9][0-9][0-9]$",line) or re.search("^RFC.+[0-9]+$",line):
            newpage=1
        if re.search("^[ \t]*$",line) and pageend and not newpage:
            continue
        if pageend and newpage and not formfeed:
            tempfile.write("\f")
        pageend=0
        formfeed=0
        newpage=0
        tempfile.write(line)

    infile.close()
    tempfile.close()
    t,psname = mkstemp()
    os.close(t)
    pipe("enscript --margins 76::76: -B -q -p "+psname + " " +tempname)
    os.unlink(tempname)
    pipe("ps2pdf "+psname+" "+outpath)
    os.unlink(psname)

def session_draft_list(num, session):
    try:
        agendas = Document.objects.filter(type="agenda",
                                         session__meeting__number=num,
                                         session__group__acronym=session,
                                         states=State.objects.get(type="agenda", slug="active")).distinct()
    except Document.DoesNotExist:
        raise Http404

    drafts = set()
    for agenda in agendas:
        content = read_agenda_file(num, agenda)
        if content:
            drafts.update(re.findall('(draft-[-a-z0-9]*)', content))

    result = []
    for draft in drafts:
        try:
            if re.search('-[0-9]{2}$', draft):
                doc_name = draft
            else:
                doc = Document.objects.get(name=draft)
                doc_name = draft + "-" + doc.rev

            if doc_name not in result:
                result.append(doc_name)
        except Document.DoesNotExist:
            pass

    return sorted(result)

def session_draft_tarfile(request, num, session):
    drafts = session_draft_list(num, session);

    response = HttpResponse(content_type='application/octet-stream')
    response['Content-Disposition'] = 'attachment; filename=%s-drafts.tgz'%(session)
    tarstream = tarfile.open('','w:gz',response)
    mfh, mfn = mkstemp()
    os.close(mfh)
    manifest = open(mfn, "w")

    for doc_name in drafts:
        pdf_path = os.path.join(settings.INTERNET_DRAFT_PDF_PATH, doc_name + ".pdf")

        if (not os.path.exists(pdf_path)):
            convert_to_pdf(doc_name)

        if os.path.exists(pdf_path):
            try:
                tarstream.add(pdf_path, str(doc_name + ".pdf"))
                manifest.write("Included:  "+pdf_path+"\n")
            except Exception, e:
                manifest.write(("Failed (%s): "%e)+pdf_path+"\n")
        else:
            manifest.write("Not found: "+pdf_path+"\n")

    manifest.close()
    tarstream.add(mfn, "manifest.txt")
    tarstream.close()
    os.unlink(mfn)
    return response

def pdf_pages(file):
    try:
        infile = open(file, "r")
    except IOError:
        return 0
    for line in infile:
        m = re.match('\] /Count ([0-9]+)',line)
        if m:
            return int(m.group(1))
    return 0


def session_draft_pdf(request, num, session):
    drafts = session_draft_list(num, session);
    curr_page = 1
    pmh, pmn = mkstemp()
    os.close(pmh)
    pdfmarks = open(pmn, "w")
    pdf_list = ""

    for draft in drafts:
        pdf_path = os.path.join(settings.INTERNET_DRAFT_PDF_PATH, draft + ".pdf")
        if (not os.path.exists(pdf_path)):
            convert_to_pdf(draft)

        if (os.path.exists(pdf_path)):
            pages = pdf_pages(pdf_path)
            pdfmarks.write("[/Page "+str(curr_page)+" /View [/XYZ 0 792 1.0] /Title (" + draft + ") /OUT pdfmark\n")
            pdf_list = pdf_list + " " + pdf_path
            curr_page = curr_page + pages

    pdfmarks.close()
    pdfh, pdfn = mkstemp()
    os.close(pdfh)
    pipe("gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=" + pdfn + " " + pdf_list + " " + pmn)

    pdf = open(pdfn,"r")
    pdf_contents = pdf.read()
    pdf.close()

    os.unlink(pmn)
    os.unlink(pdfn)
    return HttpResponse(pdf_contents, content_type="application/pdf")

def week_view(request, num=None):
    meeting = get_meeting(num)
    timeslots = TimeSlot.objects.filter(meeting=meeting)

    template = "meeting/week-view.html"
    return render_to_response(template,
            {"timeslots":timeslots,"render_types":["Session","Other","Break","Plenary"]}, context_instance=RequestContext(request))

def ical_agenda(request, num=None, name=None, ext=None):
    meeting = get_meeting(num)
    schedule = get_schedule(meeting, name)
    updated = meeting_updated(meeting)

    if schedule is None:
        raise Http404

    q = request.META.get('QUERY_STRING','') or ""
    filter = set(urllib.unquote(q).lower().split(','))
    include = [ i for i in filter if not (i.startswith('-') or i.startswith('~')) ]
    include_types = set(["plenary","other"])
    exclude = []

    # Process the special flags.
    #   "-wgname" will remove a working group from the output.
    #   "~Type" will add that type to the output.
    #   "-~Type" will remove that type from the output
    # Current types are:
    #   Session, Other (default on), Break, Plenary (default on)
    # Non-Working Group "wg names" include:
    #   edu, ietf, tools, iesg, iab

    for item in filter:
        if item:
            if item[0] == '-' and item[1] == '~':
                include_types -= set([item[2:]])
            elif item[0] == '-':
                exclude.append(item[1:])
            elif item[0] == '~':
                include_types |= set([item[1:]])

    assignments = schedule.assignments.exclude(timeslot__type__in=['lead','offagenda']).filter(
        Q(timeslot__type__slug__in = include_types) |
        Q(session__group__acronym__in = include) |
        Q(session__group__parent__acronym__in = include)
        ).exclude(session__group__acronym__in = exclude).distinct()
        #.exclude(Q(session__group__isnull = False),
        #Q(session__group__acronym__in = exclude) |
        #Q(session__group__parent__acronym__in = exclude))

    return HttpResponse(render_to_string("meeting/agenda.ics",
        {"schedule":schedule, "assignments":assignments, "updated":updated},
        RequestContext(request)), content_type="text/calendar")

def meeting_requests(request, num=None) :
    meeting = get_meeting(num)
    sessions = Session.objects.filter(meeting__number=meeting.number, type__slug='session', group__parent__isnull = False).exclude(requested_by=0).order_by("group__parent__acronym","status__slug","group__acronym")

    groups_not_meeting = Group.objects.filter(state='Active',type__in=['WG','RG','BOF']).exclude(acronym__in = [session.group.acronym for session in sessions]).order_by("parent__acronym","acronym")

    return render_to_response("meeting/requests.html",
        {"meeting": meeting, "sessions":sessions,
         "groups_not_meeting": groups_not_meeting},
        context_instance=RequestContext(request))

def session_details(request, num, acronym, date=None, week_day=None, seq=None) :
    meeting = get_meeting(num)
    sessions = Session.objects.filter(meeting=meeting,group__acronym=acronym,type__in=['session','plenary','other'])

    if not sessions:
        sessions = Session.objects.filter(meeting=meeting,short=acronym) 

    if date:
        if len(date)==15:
            start = datetime.datetime.strptime(date,"%Y-%m-%d-%H%M")
            sessions = sessions.filter(scheduledsession__schedule=meeting.agenda,scheduledsession__timeslot__time=start)
        else:
            start = datetime.datetime.strptime(date,"%Y-%m-%d").date()
            end = start+datetime.timedelta(days=1)
            sessions = sessions.filter(scheduledsession__schedule=meeting.agenda,scheduledsession__timeslot__time__range=(start,end))

    if week_day:
        try:
            dow = ['sun','mon','tue','wed','thu','fri','sat'].index(week_day.lower()[:3]) + 1
        except ValueError:
            raise Http404
        sessions = sessions.filter(scheduledsession__schedule=meeting.agenda,scheduledsession__timeslot__time__week_day=dow)
        

    def sort_key(session):
        official_sessions = session.scheduledsession_set.filter(schedule=session.meeting.agenda)
        if official_sessions:
            return official_sessions.first().timeslot.time
        else:
            return session.requested

    sessions = sorted(sessions,key=sort_key)

    if seq:
        iseq = int(seq) - 1
        if not iseq in range(0,len(sessions)):
            raise Http404
        else:
            sessions= [sessions[iseq]]

    if not sessions:
        raise Http404

    if len(sessions)==1:
        session = sessions[0]
        scheduled_time = "Not yet scheduled"
        ss = session.scheduledsession_set.filter(schedule=meeting.agenda).order_by('timeslot__time')
        if ss:
            scheduled_time = ','.join([x.timeslot.time.strftime("%A %b-%d %H%M") for x in ss])
        # TODO FIXME Deleted materials shouldn't be in the sessionpresentation_set
        filtered_sessionpresentation_set = [p for p in session.sessionpresentation_set.all() if p.document.get_state_slug(p.document.type_id)!='deleted']
        return render(request, "meeting/session_details.html",
                      { 'session':sessions[0] ,
                        'meeting' :meeting ,
                        'acronym' :acronym,
                        'time': scheduled_time,
                        'filtered_sessionpresentation_set': filtered_sessionpresentation_set
                      })
    else:
        return render(request, "meeting/session_list.html",
                      { 'sessions':sessions ,
                        'meeting' :meeting ,
                        'acronym' :acronym,
                      })