# changing state and metadata and commenting on Internet Drafts for
# Area Directors and Secretariat

import re, os
from datetime import datetime, date, time, timedelta
from django.http import HttpResponse, HttpResponseRedirect, Http404
from django.shortcuts import render_to_response, get_object_or_404
from django.core.urlresolvers import reverse as urlreverse
from django.template.loader import render_to_string
from django.template import RequestContext
from django import forms
from django.utils.html import strip_tags
from django.db.models import Max
from django.conf import settings

from ietf.utils.mail import send_mail_text
from ietf.ietfauth.decorators import group_required
from ietf.idtracker.templatetags.ietf_filters import in_group
from ietf.ietfauth.decorators import has_role
from ietf.idtracker.models import *
from ietf.iesg.models import *
from ietf.idrfc.mails import *
from ietf.idrfc.utils import *
from ietf.idrfc.lastcall import request_last_call

from ietf.ietfworkflows.models import Stream
from ietf.ietfworkflows.utils import update_stream
from ietf.ietfworkflows.streams import get_stream_from_draft

from ietf.doc.models import *
from ietf.name.models import IntendedStdLevelName, DocTagName, StreamName
from ietf.person.models import Person, Email

class ChangeStateForm(forms.Form):
    pass

@group_required('Area_Director','Secretariat')
def change_state(request, name):
    pass

IESG_SUBSTATE_TAGS = ('point', 'ad-f-up', 'need-rev', 'extpty')

class ChangeStateFormREDESIGN(forms.Form):
    state = forms.ModelChoiceField(State.objects.filter(type="draft-iesg"), empty_label=None, required=True)
    substate = forms.ModelChoiceField(DocTagName.objects.filter(slug__in=IESG_SUBSTATE_TAGS), required=False)
    comment = forms.CharField(widget=forms.Textarea, required=False)

@group_required('Area_Director','Secretariat')
def change_stateREDESIGN(request, name):
    """Change state of Internet Draft, notifying parties as necessary
    and logging the change as a comment."""
    doc = get_object_or_404(Document, docalias__name=name)
    if (not doc.latest_event(type="started_iesg_process")) or doc.get_state_slug() == "expired":
        raise Http404()

    login = request.user.get_profile()

    if request.method == 'POST':
        form = ChangeStateForm(request.POST)
        if form.is_valid():
            state = form.cleaned_data['state']
            tag = form.cleaned_data['substate']
            comment = form.cleaned_data['comment'].strip()
            prev = doc.get_state("draft-iesg")

            # tag handling is a bit awkward since the UI still works
            # as if IESG tags are a substate
            prev_tag = doc.tags.filter(slug__in=('point', 'ad-f-up', 'need-rev', 'extpty'))
            prev_tag = prev_tag[0] if prev_tag else None

            if state != prev or tag != prev_tag:
                save_document_in_history(doc)
                
                doc.set_state(state)

                if prev_tag:
                    doc.tags.remove(prev_tag)

                if tag:
                    doc.tags.add(tag)

                e = log_state_changed(request, doc, login, prev, prev_tag)

                if comment:
                    c = DocEvent(type="added_comment")
                    c.doc = doc
                    c.by = login
                    c.desc = comment
                    c.save()

                    e.desc += "<br>" + comment
                
                doc.time = e.time
                doc.save()

                email_state_changed(request, doc, e.desc)
                email_owner(request, doc, doc.ad, login, e.desc)

                if state.slug == "lc-req":
                    request_last_call(request, doc)

                    return render_to_response('idrfc/last_call_requested.html',
                                              dict(doc=doc,
                                                   url=doc.get_absolute_url()),
                                              context_instance=RequestContext(request))
                
            return HttpResponseRedirect(doc.get_absolute_url())

    else:
        state = doc.get_state("draft-iesg")
        t = doc.tags.filter(slug__in=('point', 'ad-f-up', 'need-rev', 'extpty'))
        form = ChangeStateForm(initial=dict(state=state.pk if state else None,
                                            substate=t[0].pk if t else None))

    state = doc.get_state("draft-iesg")
    next_states = state.next_states.all() if state else None
    prev_state = None

    hists = doc.history_set.exclude(states=doc.get_state("draft-iesg")).order_by('-time')[:1]
    if hists:
        prev_state = hists[0].get_state("draft-iesg")

    to_iesg_eval = None
    if not doc.latest_event(type="sent_ballot_announcement"):
        if next_states and next_states.filter(slug="iesg-eva"):
            to_iesg_eval = State.objects.get(type="draft-iesg", slug="iesg-eva")
            next_states = next_states.exclude(slug="iesg-eva")

    return render_to_response('idrfc/change_stateREDESIGN.html',
                              dict(form=form,
                                   doc=doc,
                                   prev_state=prev_state,
                                   next_states=next_states,
                                   to_iesg_eval=to_iesg_eval),
                              context_instance=RequestContext(request))

if settings.USE_DB_REDESIGN_PROXY_CLASSES:
    change_state = change_stateREDESIGN
    ChangeStateForm = ChangeStateFormREDESIGN

class ChangeStreamForm(forms.Form):
    stream = forms.ModelChoiceField(StreamName.objects.exclude(slug="legacy"), required=False)
    comment = forms.CharField(widget=forms.Textarea, required=False)

@group_required('Area_Director','Secretariat')
def change_stream(request, name):
    """Change the stream of a Document of type 'draft' , notifying parties as necessary
    and logging the change as a comment."""
    doc = get_object_or_404(Document, docalias__name=name)
    if not doc.type_id=='draft':
        raise Http404()

    login = request.user.get_profile()

    if request.method == 'POST':
        form = ChangeStreamForm(request.POST)
        if form.is_valid():
            new_stream = form.cleaned_data['stream']
            comment = form.cleaned_data['comment'].strip()
            old_stream = doc.stream

            if new_stream != old_stream:
                save_document_in_history(doc)
                
                doc.stream = new_stream

                e = DocEvent(doc=doc,by=login,type='changed_document')
                e.desc = u"Stream changed to <b>%s</b> from %s"% (new_stream,old_stream) 
                e.save()

                email_desc = e.desc

                if comment:
                    c = DocEvent(doc=doc,by=login,type="added_comment")
                    c.desc = comment
                    c.save()
                    email_desc += "\n"+c.desc
                
                doc.time = e.time
                doc.save()

                email_stream_changed(request, doc, old_stream, new_stream, email_desc)

            return HttpResponseRedirect(doc.get_absolute_url())

    else:
        stream = doc.stream
        form = ChangeStreamForm(initial=dict(stream=stream))

    return render_to_response('idrfc/change_stream.html',
                              dict(form=form,
                                   doc=doc,
                                   ),
                              context_instance=RequestContext(request))

class ChangeIntentionForm(forms.Form):
    intended_std_level = forms.ModelChoiceField(IntendedStdLevelName.objects.filter(used=True), empty_label="(None)", required=True, label="Intended RFC status")
    comment = forms.CharField(widget=forms.Textarea, required=False)

@group_required('Area_Director','Secretariat')
def change_intention(request, name):
    """Change the intended publication status of a Document of type 'draft' , notifying parties 
       as necessary and logging the change as a comment."""
    doc = get_object_or_404(Document, docalias__name=name)
    if not doc.type_id=='draft':
        raise Http404()

    login = request.user.get_profile()

    if request.method == 'POST':
        form = ChangeIntentionForm(request.POST)
        if form.is_valid():
            new_level = form.cleaned_data['intended_std_level']
            comment = form.cleaned_data['comment'].strip()
            old_level = doc.intended_std_level

            if new_level != old_level:
                save_document_in_history(doc)
                
                doc.intended_std_level = new_level

                e = DocEvent(doc=doc,by=login,type='changed_document')
                e.desc = u"Intended Status changed to <b>%s</b> from %s"% (new_level,old_level) 
                e.save()

                email_desc = e.desc

                if comment:
                    c = DocEvent(doc=doc,by=login,type="added_comment")
                    c.desc = comment
                    c.save()
                    email_desc += "\n"+c.desc
                
                doc.time = e.time
                doc.save()

                email_owner(request, doc, doc.ad, login, email_desc)

            return HttpResponseRedirect(doc.get_absolute_url())

    else:
        intended_std_level = doc.intended_std_level
        form = ChangeIntentionForm(initial=dict(intended_std_level=intended_std_level))

    return render_to_response('idrfc/change_intended_status.html',
                              dict(form=form,
                                   doc=doc,
                                   ),
                              context_instance=RequestContext(request))

def dehtmlify_textarea_text(s):
    return s.replace("<br>", "\n").replace("<b>", "").replace("</b>", "").replace("  ", " ")

class EditInfoForm(forms.Form):
    pass

def get_initial_state_change_notice(doc):
    # set change state notice to something sensible
    receivers = []
    if doc.group_id == Acronym.INDIVIDUAL_SUBMITTER:
        for a in doc.authors.all():
            # maybe it would be more appropriate to use a.email() ?
            e = a.person.email()[1]
            if e:
                receivers.append(e)
    else:
        receivers.append("%s-chairs@%s" % (doc.group.acronym, settings.TOOLS_SERVER))
        for editor in doc.group.ietfwg.wgeditor_set.all():
            e = editor.person.email()[1]
            if e:
                receivers.append(e)

    receivers.append("%s@%s" % (doc.filename, settings.TOOLS_SERVER))
    return ", ".join(receivers)

def get_new_ballot_id():
    return IDInternal.objects.aggregate(Max('ballot'))['ballot__max'] + 1
    
@group_required('Area_Director','Secretariat')
def edit_info(request, name):
    pass

class EditInfoFormREDESIGN(forms.Form):
    intended_std_level = forms.ModelChoiceField(IntendedStdLevelName.objects.filter(used=True), empty_label="(None)", required=True, label="Intended RFC status")
    area = forms.ModelChoiceField(Group.objects.filter(type="area", state="active"), empty_label="(None - individual submission)", required=False, label="Assigned to area")
    ad = forms.ModelChoiceField(Person.objects.filter(role__name="ad", role__group__state="active").order_by('name'), label="Responsible AD", empty_label="(None)", required=True)
    create_in_state = forms.ModelChoiceField(State.objects.filter(type="draft-iesg", slug__in=("pub-req", "watching")), empty_label=None, required=False)
    notify = forms.CharField(max_length=255, label="Notice emails", help_text="Separate email addresses with commas", required=False)
    note = forms.CharField(widget=forms.Textarea, label="IESG note", required=False)
    telechat_date = forms.TypedChoiceField(coerce=lambda x: datetime.datetime.strptime(x, '%Y-%m-%d').date(), empty_value=None, required=False, widget=forms.Select(attrs={'onchange':'make_bold()'}))
    returning_item = forms.BooleanField(required=False)

    def __init__(self, *args, **kwargs):
        super(self.__class__, self).__init__(*args, **kwargs)

        # if previous AD is now ex-AD, append that person to the list
        ad_pk = self.initial.get('ad')
        choices = self.fields['ad'].choices
        if ad_pk and ad_pk not in [pk for pk, name in choices]:
            self.fields['ad'].choices = list(choices) + [("", "-------"), (ad_pk, Person.objects.get(pk=ad_pk).plain_name())]
        
        # telechat choices
        dates = [d.date for d in TelechatDate.objects.active().order_by('date')]
        init = kwargs['initial']['telechat_date']
        if init and init not in dates:
            dates.insert(0, init)

        self.fields['telechat_date'].choices = [("", "(not on agenda)")] + [(d, d.strftime("%Y-%m-%d")) for d in dates]

        # returning item is rendered non-standard
        self.standard_fields = [x for x in self.visible_fields() if x.name not in ('returning_item',)]

    def clean_note(self):
        # note is stored munged in the database
        return self.cleaned_data['note'].replace('\n', '<br>').replace('\r', '').replace('  ', '&nbsp; ')


def get_initial_notify(doc):
    # set change state notice to something sensible
    receivers = []
    if doc.group.type_id in ("individ", "area"):
        for a in doc.authors.all():
            receivers.append(a.address)
    else:
        receivers.append("%s-chairs@%s" % (doc.group.acronym, settings.TOOLS_SERVER))
        for editor in Email.objects.filter(role__name="editor", role__group=doc.group):
            receivers.append(e.address)

    receivers.append("%s@%s" % (doc.name, settings.TOOLS_SERVER))
    return ", ".join(receivers)

@group_required('Area_Director','Secretariat')
def edit_infoREDESIGN(request, name):
    """Edit various Internet Draft attributes, notifying parties as
    necessary and logging changes as document events."""
    doc = get_object_or_404(Document, docalias__name=name)
    if doc.get_state_slug() == "expired":
        raise Http404()

    login = request.user.get_profile()

    new_document = False
    if not doc.get_state("draft-iesg"): # FIXME: should probably receive "new document" as argument to view instead of this
        new_document = True
        doc.notify = get_initial_notify(doc)

    e = doc.latest_event(TelechatDocEvent, type="scheduled_for_telechat")
    initial_telechat_date = e.telechat_date if e else None
    initial_returning_item = bool(e and e.returning_item)

    if request.method == 'POST':
        form = EditInfoForm(request.POST,
                            initial=dict(ad=doc.ad_id,
                                         telechat_date=initial_telechat_date))
        if form.is_valid():
            save_document_in_history(doc)
            
            r = form.cleaned_data
            if new_document:
                doc.set_state(r['create_in_state'])

                # fix so Django doesn't barf in the diff below because these
                # fields can't be NULL
                doc.ad = r['ad']

                replaces = Document.objects.filter(docalias__relateddocument__source=doc, docalias__relateddocument__relationship="replaces")
                if replaces:
                    # this should perhaps be somewhere else, e.g. the
                    # place where the replace relationship is established?
                    e = DocEvent()
                    e.type = "added_comment"
                    e.by = Person.objects.get(name="(System)")
                    e.doc = doc
                    e.desc = "Earlier history may be found in the Comment Log for <a href=\"%s\">%s</a>" % (replaces[0], replaces[0].get_absolute_url())
                    e.save()

                e = DocEvent()
                e.type = "started_iesg_process"
                e.by = login
                e.doc = doc
                e.desc = "IESG process started in state <b>%s</b>" % doc.get_state("draft-iesg").name
                e.save()
                    
            orig_ad = doc.ad

            changes = []

            def desc(attr, new, old):
                entry = "%(attr)s changed to <b>%(new)s</b> from <b>%(old)s</b>"
                if new_document:
                    entry = "%(attr)s changed to <b>%(new)s</b>"
                
                return entry % dict(attr=attr, new=new, old=old)
            
            def diff(attr, name):
                v = getattr(doc, attr)
                if r[attr] != v:
                    changes.append(desc(name, r[attr], v))
                    setattr(doc, attr, r[attr])

            # update the attributes, keeping track of what we're doing
            diff('intended_std_level', "Intended Status")
            diff('ad', "Responsible AD")
            diff('notify', "State Change Notice email list")

            if r['note'] != doc.note:
                if not r['note']:
                    if doc.note:
                        changes.append("Note field has been cleared")
                else:
                    if doc.note:
                        changes.append("Note changed to '%s'" % r['note'])
                    else:
                        changes.append("Note added '%s'" % r['note'])
                    
                doc.note = r['note']

            if doc.group.type_id in ("individ", "area"):
                if not r["area"]:
                    r["area"] = Group.objects.get(type="individ")

                if r["area"] != doc.group:
                    if r["area"].type_id == "area":
                        changes.append(u"Assigned to <b>%s</b>" % r["area"].name)
                    else:
                        changes.append(u"No longer assigned to any area")
                    doc.group = r["area"]

            for c in changes:
                e = DocEvent(doc=doc, by=login)
                e.desc = c
                e.type = "changed_document"
                e.save()

            update_telechat(request, doc, login,
                            r['telechat_date'], r['returning_item'])

            doc.time = datetime.datetime.now()

            if changes and not new_document:
                email_owner(request, doc, orig_ad, login, "\n".join(changes))
                
            doc.save()
            return HttpResponseRedirect(doc.get_absolute_url())
    else:
        init = dict(intended_std_level=doc.intended_std_level_id,
                    area=doc.group_id,
                    ad=doc.ad_id,
                    notify=doc.notify,
                    note=dehtmlify_textarea_text(doc.note),
                    telechat_date=initial_telechat_date,
                    returning_item=initial_returning_item,
                    )

        form = EditInfoForm(initial=init)

    # optionally filter out some fields
    if not new_document:
        form.standard_fields = [x for x in form.standard_fields if x.name != "create_in_state"]
    if doc.group.type_id not in ("individ", "area"):
        form.standard_fields = [x for x in form.standard_fields if x.name != "area"]

    return render_to_response('idrfc/edit_infoREDESIGN.html',
                              dict(doc=doc,
                                   form=form,
                                   user=request.user,
                                   login=login,
                                   ballot_issued=doc.latest_event(type="sent_ballot_announcement")),
                              context_instance=RequestContext(request))

if settings.USE_DB_REDESIGN_PROXY_CLASSES:
    EditInfoForm = EditInfoFormREDESIGN
    edit_info = edit_infoREDESIGN


@group_required('Area_Director','Secretariat')
def request_resurrect(request, name):
    """Request resurrect of expired Internet Draft."""
    doc = get_object_or_404(InternetDraft, filename=name)
    if doc.status.status != "Expired":
        raise Http404()

    if not doc.idinternal:
        doc.idinternal = IDInternal(draft=doc, rfc_flag=type(doc) == Rfc)

    login = IESGLogin.objects.get(login_name=request.user.username)

    if request.method == 'POST':
        email_resurrect_requested(request, doc, login)
        add_document_comment(request, doc, "Resurrection was requested")
        doc.idinternal.resurrect_requested_by = login
        doc.idinternal.save()
        return HttpResponseRedirect(doc.idinternal.get_absolute_url())
  
    return render_to_response('idrfc/request_resurrect.html',
                              dict(doc=doc,
                                   back_url=doc.idinternal.get_absolute_url()),
                              context_instance=RequestContext(request))

@group_required('Area_Director','Secretariat')
def request_resurrectREDESIGN(request, name):
    """Request resurrect of expired Internet Draft."""
    doc = get_object_or_404(Document, docalias__name=name)
    if doc.get_state_slug() != "expired":
        raise Http404()

    login = request.user.get_profile()

    if request.method == 'POST':
        email_resurrect_requested(request, doc, login)
        
        e = DocEvent(doc=doc, by=login)
        e.type = "requested_resurrect"
        e.desc = "Resurrection was requested"
        e.save()
        
        return HttpResponseRedirect(doc.get_absolute_url())
  
    return render_to_response('idrfc/request_resurrect.html',
                              dict(doc=doc,
                                   back_url=doc.get_absolute_url()),
                              context_instance=RequestContext(request))

if settings.USE_DB_REDESIGN_PROXY_CLASSES:
     request_resurrect = request_resurrectREDESIGN

@group_required('Secretariat')
def resurrect(request, name):
    """Resurrect expired Internet Draft."""
    doc = get_object_or_404(InternetDraft, filename=name)
    if doc.status.status != "Expired":
        raise Http404()

    if not doc.idinternal:
        doc.idinternal = IDInternal(draft=doc, rfc_flag=type(doc) == Rfc)

    login = IESGLogin.objects.get(login_name=request.user.username)

    if request.method == 'POST':
        if doc.idinternal.resurrect_requested_by:
            email_resurrection_completed(request, doc)
        add_document_comment(request, doc, "Resurrection was completed")
        doc.idinternal.resurrect_requested_by = None
        doc.idinternal.event_date = date.today()
        doc.idinternal.save()
        doc.status = IDStatus.objects.get(status="Active")
        doc.save()
        return HttpResponseRedirect(doc.idinternal.get_absolute_url())
  
    return render_to_response('idrfc/resurrect.html',
                              dict(doc=doc,
                                   back_url=doc.idinternal.get_absolute_url()),
                              context_instance=RequestContext(request))

@group_required('Secretariat')
def resurrectREDESIGN(request, name):
    """Resurrect expired Internet Draft."""
    doc = get_object_or_404(Document, docalias__name=name)
    if doc.get_state_slug() != "expired":
        raise Http404()

    login = request.user.get_profile()

    if request.method == 'POST':
        save_document_in_history(doc)
        
        e = doc.latest_event(type__in=('requested_resurrect', "completed_resurrect"))
        if e and e.type == 'requested_resurrect':
            email_resurrection_completed(request, doc, requester=e.by)
            
        e = DocEvent(doc=doc, by=login)
        e.type = "completed_resurrect"
        e.desc = "Resurrection was completed"
        e.save()
        
        doc.set_state(State.objects.get(type="draft", slug="active"))
        doc.expires = datetime.datetime.now() + datetime.timedelta(settings.INTERNET_DRAFT_DAYS_TO_EXPIRE)
        doc.time = datetime.datetime.now()
        doc.save()
        return HttpResponseRedirect(doc.get_absolute_url())
  
    return render_to_response('idrfc/resurrect.html',
                              dict(doc=doc,
                                   back_url=doc.get_absolute_url()),
                              context_instance=RequestContext(request))

if settings.USE_DB_REDESIGN_PROXY_CLASSES:
     resurrect = resurrectREDESIGN


class AddCommentForm(forms.Form):
    comment = forms.CharField(required=True, widget=forms.Textarea)

@group_required('Area_Director','Secretariat', 'IANA')
def add_comment(request, name):
    """Add comment to Internet Draft."""
    doc = get_object_or_404(InternetDraft, filename=name)
    if not doc.idinternal:
        raise Http404()

    login = IESGLogin.objects.get(login_name=request.user.username)

    if request.method == 'POST':
        form = AddCommentForm(request.POST)
        if form.is_valid():
            c = form.cleaned_data['comment']
            add_document_comment(request, doc, c)
            email_owner(request, doc, doc.idinternal.job_owner, login,
                        "A new comment added by %s" % login)
            return HttpResponseRedirect(doc.idinternal.get_absolute_url())
    else:
        form = AddCommentForm()
  
    return render_to_response('idrfc/add_comment.html',
                              dict(doc=doc,
                                   form=form,
                                   back_url=doc.idinternal.get_absolute_url()),
                              context_instance=RequestContext(request))

@group_required('Area_Director', 'Secretariat', 'IANA')
def add_commentREDESIGN(request, name):
    """Add comment to history of document."""
    doc = get_object_or_404(Document, docalias__name=name)

    login = request.user.get_profile()

    if request.method == 'POST':
        form = AddCommentForm(request.POST)
        if form.is_valid():
            c = form.cleaned_data['comment']
            
            e = DocEvent(doc=doc, by=login)
            e.type = "added_comment"
            e.desc = c
            e.save()

            if doc.type_id == "draft":
                email_owner(request, doc, doc.ad, login,
                            "A new comment added by %s" % login.name)
            return HttpResponseRedirect(urlreverse("doc_history", kwargs=dict(name=doc.name)))
    else:
        form = AddCommentForm()
  
    return render_to_response('idrfc/add_comment.html',
                              dict(doc=doc,
                                   form=form),
                              context_instance=RequestContext(request))

if settings.USE_DB_REDESIGN_PROXY_CLASSES:
     add_comment = add_commentREDESIGN

class NotifyForm(forms.Form):
    notify = forms.CharField(max_length=255, label="Notice emails", help_text="Separate email addresses with commas", required=False)


@group_required('Area_Director','Secretariat')
def edit_notices(request, name):
    """Change the set of email addresses document change notificaitions go to."""

    doc = get_object_or_404(Document, type="draft", name=name)

    if request.method == 'POST':

        if "save_addresses" in request.POST:
            form = NotifyForm(request.POST)
            if form.is_valid():

                doc.notify = form.cleaned_data['notify']
                doc.save()

                login = request.user.get_profile()
                c = DocEvent(type="added_comment", doc=doc, by=login)
                c.desc = "Notification list changed to : "+doc.notify
                c.save()

                return HttpResponseRedirect(urlreverse('doc_view', kwargs={'name': doc.name}))

        elif "regenerate_addresses" in request.POST:
            init = { "notify" : get_initial_notify(doc) }
            form = NotifyForm(initial=init)

        # Protect from handcrufted POST
        else:
            init = { "notify" : doc.notify }
            form = NotifyForm(initial=init)

    else:

        init = { "notify" : doc.notify }
        form = NotifyForm(initial=init)

    return render_to_response('idrfc/change_notify.html',
                              {'form':   form,
                               'doc': doc,
                              },
                              context_instance = RequestContext(request))

class TelechatForm(forms.Form):
    telechat_date = forms.TypedChoiceField(coerce=lambda x: datetime.datetime.strptime(x, '%Y-%m-%d').date(), empty_value=None, required=False)
    returning_item = forms.BooleanField(required=False)

    def __init__(self, *args, **kwargs):
        super(self.__class__, self).__init__(*args, **kwargs)

        dates = [d.date for d in TelechatDate.objects.active().order_by('date')]
        init = kwargs['initial'].get("telechat_date")
        if init and init not in dates:
            dates.insert(0, init)

        self.fields['telechat_date'].choices = [("", "(not on agenda)")] + [(d, d.strftime("%Y-%m-%d")) for d in dates]
        

@group_required("Area Director", "Secretariat")
def telechat_date(request, name):
    doc = get_object_or_404(Document, type="draft", name=name)
    login = request.user.get_profile()

    e = doc.latest_event(TelechatDocEvent, type="scheduled_for_telechat")
    initial_returning_item = bool(e and e.returning_item)

    initial = dict(telechat_date=e.telechat_date if e else None,
                   returning_item = initial_returning_item,
                  )
    if request.method == "POST":
        form = TelechatForm(request.POST, initial=initial)

        if form.is_valid():
            update_telechat(request, doc, login, form.cleaned_data['telechat_date'],form.cleaned_data['returning_item'])
            return HttpResponseRedirect(urlreverse('doc_view', kwargs={'name': doc.name}))
    else:
        form = TelechatForm(initial=initial)

    return render_to_response('idrfc/edit_telechat_date.html',
                              dict(doc=doc,
                                   form=form,
                                   user=request.user,
                                   login=login),
                              context_instance=RequestContext(request))


class IESGNoteForm(forms.Form):
    note = forms.CharField(widget=forms.Textarea, label="IESG note", required=False)

    def clean_note(self):
        # note is stored munged in the database
        return self.cleaned_data['note'].replace('\n', '<br>').replace('\r', '').replace('  ', '&nbsp; ')

@group_required("Area Director", "Secretariat")
def edit_iesg_note(request, name):
    doc = get_object_or_404(Document, type="draft", name=name)
    login = request.user.get_profile()

    initial = dict(note=dehtmlify_textarea_text(doc.note))

    if request.method == "POST":
        form = IESGNoteForm(request.POST, initial=initial)

        if form.is_valid():
            new_note = form.cleaned_data['note']
            if new_note != doc.note:
                if not new_note:
                    if doc.note:
                        log_message = "Note field has been cleared"
                else:
                    if doc.note:
                        log_message = "Note changed to '%s'" % new_note
                    else:
                        log_message = "Note added '%s'" % new_note

                doc.note = new_note
                doc.save()

                c = DocEvent(type="added_comment", doc=doc, by=login)
                c.desc = log_message
                c.save()

            return HttpResponseRedirect(urlreverse('doc_view', kwargs={'name': doc.name}))
    else:
        form = IESGNoteForm(initial=initial)

    return render_to_response('idrfc/edit_iesg_note.html',
                              dict(doc=doc,
                                   form=form,
                                   ),
                              context_instance=RequestContext(request))

class AdForm(forms.Form):
    ad = forms.ModelChoiceField(Person.objects.filter(role__name="ad", role__group__state="active").order_by('name'), 
                                label="Shepherding AD", empty_label="(None)", required=True)

    def __init__(self, *args, **kwargs):
        super(self.__class__, self).__init__(*args, **kwargs)

        # if previous AD is now ex-AD, append that person to the list
        ad_pk = self.initial.get('ad')
        choices = self.fields['ad'].choices
        if ad_pk and ad_pk not in [pk for pk, name in choices]:
            self.fields['ad'].choices = list(choices) + [("", "-------"), (ad_pk, Person.objects.get(pk=ad_pk).plain_name())]

@group_required("Area Director", "Secretariat")
def edit_ad(request, name):
    """Change the shepherding Area Director for this draft."""

    doc = get_object_or_404(Document, type="draft", name=name)

    if request.method == 'POST':
        form = AdForm(request.POST)
        if form.is_valid():

            doc.ad = form.cleaned_data['ad']
            doc.save()
    
            login = request.user.get_profile()
            c = DocEvent(type="added_comment", doc=doc, by=login)
            c.desc = "Shepherding AD changed to "+doc.ad.name
            c.save()

            return HttpResponseRedirect(urlreverse('doc_view', kwargs={'name': doc.name}))

    else:
        init = { "ad" : doc.ad_id }
        form = AdForm(initial=init)

    return render_to_response('idrfc/change_ad.html',
                              {'form':   form,
                               'doc': doc,
                              },
                              context_instance = RequestContext(request))