import urllib
import urllib2
import json

from io import StringIO
from django.contrib import messages
from django.http import HttpResponseRedirect, HttpResponse, Http404
from django.http.response import HttpResponseNotAllowed
from django.core.urlresolvers import reverse
from django.shortcuts import get_object_or_404, render, render_to_response
from django.utils import timezone
from django.views import generic
from django.conf import settings
from django.core import serializers

from .forms import EventForm, PollForm, OptionFormset, QuestionFormset, OrganiserFormSet, TrusteeFormSet, VoteForm, EventSetupForm, EventEditForm, DecryptionFormset, DecryptionFormSetHelper
from .models import Event, Poll, PollOption, EmailUser, Ballot, TrusteeKey, Decryption
from allauthdemo.auth.models import DemoUser

from .tasks import email_trustees_prep, update_EID, generate_combpk, generate_enc, tally_results

from .utils.EventModelAdaptor import EventModelAdaptor

class EventListView(generic.ListView):

    model = Event

    def get_context_data(self, **kwargs):
        context = super(EventListView, self).get_context_data(**kwargs)
        #context['now'] = timezone.now()
        return context

class EventDetailView(generic.DetailView):
    template_name="polls/event_detail_details.html"
    model = Event

    def get_context_data(self, **kwargs):
        context = super(EventDetailView, self).get_context_data(**kwargs)
        context['is_organiser'] = ((not self.request.user.is_anonymous()) and (self.object.users_organisers.filter(email=self.request.user.email).exists()))

        #context['now'] = timezone.now()
        return context


class EventDetailPollsView(EventDetailView):
    template_name="polls/event_detail_polls.html"

class EventDetailOrganisersView(EventDetailView):
    template_name="polls/event_detail_organisers.html"

class EventDetailLaunchView(EventDetailView):
    template_name="polls/event_detail_launch.html"

class PollDetailView(generic.View):

    model = Poll

    def get_context_data(self, **kwargs):
        context = super(PollDetailView, self).get_context_data(**kwargs)
        #context['now'] = timezone.now()
        context['form'] = VoteForm(instance=self.object)
        context['poll_count'] = self.object.event.polls.all().count()
        return context

#my_value = self.kwargs.get('key', 'default_value')

def test_poll_detail(request, event_id, poll_num, key=None):
    context = {}
    context['form'] = VoteForm(instance=self.object)
    context['poll_count'] = self.object.event.polls.all().count()
    return render(request, "polls/event_setup.html", context)

def util_get_poll_by_event_index(event, poll_num):
    try:
        poll_num = int(poll_num)
        if ((poll_num < 1) or (poll_num > event.polls.all().count())):
            return None
        poll = event.polls.filter().order_by('id')[poll_num-1] # index field eventually
    except ValueError:
        return None
    return poll

def edit_poll(request, event_id, poll_num):
    event = get_object_or_404(Event, pk=event_id)
    event_poll_count = event.polls.all().count()
    poll = util_get_poll_by_event_index(event, poll_num)

    if (poll == None):
        raise Http404("Poll does not exist")

    form = PollForm(instance=poll, prefix="main")
    formset = OptionFormset(instance=poll, prefix="formset_options")
    return render(request, "polls/generic_form.html", {'form_title': "Edit Poll: " + poll.question_text, 'form': form, 'option_formset': formset})

def view_poll(request, event_id, poll_num):
    #return HttpResponse(param("012345"))
    #return HttpResponse(combpk(param("012345"), "ABzqvL+pqTi+DNLLRcM62RwCoaZTaXVbOs3sk4fc0+Dc 0 AAaQd6S1x+bcgnkDp2ev5mTt34ICQdZIzP9GaqG4x5sy 0" "ABhQay9jI4pZvkAETNwfo8iwJ8eBMkjqplqAiu/FZxMy 0 ABPxj0jVj3rt0VW54iv4tV02gYtujnR41t5gf97asrPs 0 ABfoiW03bsYIUgfAThmjurmOViKy9L89vfkIavhQIblm 1 ABhQay9jI4pZvkAETNwfo8iwJ8eBMkjqplqAiu/FZxMy 0 ABPxj0jVj3rt0VW54iv4tV02gYtujnR41t5gf97asrPs 0 ABfoiW03bsYIUgfAThmjurmOViKy9L89vfkIavhQIblm 1 ABhQay9jI4pZvkAETNwfo8iwJ8eBMkjqplqAiu/FZxMy 0 ABPxj0jVj3rt0VW54iv4tV02gYtujnR41t5gf97asrPs 0 ABfoiW03bsYIUgfAThmjurmOViKy9L89vfkIavhQIblm 1"))
    #return HttpResponse(addec("ACMW70Yj3+mJ/FO+6VOSDGYPYHf7NoTXdpInbfzUqYpH 0 ABV4Mo496B0FW3AW/7gY6Fs+oz6BwfwilonMYeriUyV/ 0 AAg+bdGhs3sxSxAc/wcKdBNUy+el8A2b4yVYShNOb8uX 0 AAspJbn5V2AaY4CgLkzCkHwUWbC5nyxrBzw+o4Az8HVM 1 ABKI7o5Yhgi44XwpFnPpLnH0/czbXA8y5vM4ucV8vojo 1 AAwVrT9+dcQsqRZYoI7+QsJvWOgd7JaJpfI6envmC2jU 1 ABIZO0DK4OrdROD805of6iRk2RenonGYmo2qG2IB1sj/ 1 ACMUHQdjGN0wyCd2AgDHMk9u0TpnywNVtamHWopGho8L 0 ABNT5lbE4siC3QklQXRvTwSQPwtme91+UrIr9iXT3y84 1 ABib0mmQ9ZVCrErqFwDgoRp3jHPpjHGQR2vsMVlwM+vI 0 ABvf3cg1NSS8fn6EKJNnTomeoflcEY1WBxkPPKrBBFl+ 0 ACBUZAtolN4HNh+mw4jLZuHzD+/rYHKR5av16PUc6BJF 0", "2"))
    #return HttpResponse(tally("ACNQLLQlh+lNm1Dc+X+dEI0ECVLTkxRHjRnzX1OA+HtW 0 AAWOsUZK/G/cjhUee/gPAXop3Bc0CTVG3iDdQxD6+XqV 0", "ACNQLLQlh+lNm1Dc+X+dEI0ECVLTkxRHjRnzX1OA+HtW 0 0 2", "2"))
    event = get_object_or_404(Event, pk=event_id)
    if (not event.prepared):
        messages.add_message(request, messages.WARNING, "This Event isn\'t ready for voting yet.")
        return HttpResponseRedirect(reverse("user_home"))
    event_poll_count = event.polls.all().count()
    prev_poll_index, next_poll_index = False, False
    can_vote, has_voted, voter_email, vote_count = False, False, "", 0
    poll = util_get_poll_by_event_index(event, poll_num)

    if (poll == None):
        raise Http404("Poll does not exist")

    form = VoteForm(instance=poll)
    poll_num = int(poll_num) # now known to be safe as it suceeded in the util function

    if (poll_num > 1):
        prev_poll_index = (poll_num - 1)
    if (poll_num < event_poll_count):
        next_poll_index = (poll_num + 1)

    access_key = request.GET.get('key', None)
    email_key = event.keys.filter(key=access_key)
    vote_count = Ballot.objects.filter(poll=poll, cast=True).count()

    if (email_key.exists() and event.voters.filter(email=email_key[0].user.email).exists()):
        ballot = Ballot.objects.filter(voter=email_key[0].user, poll=poll)
        if (ballot.exists() and ballot[0].cast):
            has_voted = True

    if (access_key and email_key.exists()): #or (can_vote(request.user, event))
        voter_email = email_key[0].user.email
        can_vote = True

    if (request.method == "POST"):
        form = VoteForm(request.POST, instance=poll)
        if (email_key.exists()):
            #return HttpResponse(email_key[0].key)
            ballot = Ballot.objects.get_or_create(voter=email_key[0].user, poll=poll)[0]

        if (form.is_valid()):
            ballot.cipher_text_c1 = request.POST["cipher_text_c1"]
            ballot.cipher_text_c2 = request.POST["cipher_text_c2"]
            ballot.cast = True
            ballot.save()
            if (next_poll_index):
                return HttpResponseRedirect(reverse('polls:view-poll', kwargs={'event_id': event.id, 'poll_num': next_poll_index }) + "?key=" + email_key[0].key)
            else:
                return HttpResponse("Voted successfully!") # finished all polls in event

    return render(request, "polls/poll_detail.html",
        {"object": poll, "poll_num": poll_num , "event": event, "form": form, "poll_count": event.polls.all().count(),
            "prev_index": prev_poll_index , "next_index": next_poll_index,
            "can_vote": can_vote, "voter_email": voter_email, "has_voted": has_voted, "vote_count": vote_count
        })

def event_trustee_setup(request, event_id):
    # Obtain the event and the event preparation access key that's been supplied
    event = get_object_or_404(Event, pk=event_id)
    access_key = request.GET.get('key', None)

    # If the a_key is present, check it's valid and related to a trustee EmailUser instance for this event
    if access_key:
        email_key = event.keys.filter(key=access_key)
        if email_key.exists() and event.users_trustees.filter(email=email_key[0].user.email).exists():
            if TrusteeKey.objects.filter(event=event, user=email_key[0].user).exists():
                messages.add_message(request, messages.WARNING, 'You have already submitted your key for this event')
                return HttpResponseRedirect(reverse("user_home"))
            if request.method == "POST":
                form = EventSetupForm(request.POST)

                # If form data is valid, create a TrusteeKey object with the supplied public key
                if form.is_valid():
                    public_key = request.POST["public_key"]
                    key = TrusteeKey.objects.get_or_create(event=event, user=email_key[0].user)[0]
                    key.key = public_key
                    key.save()

                    # When all trustees have supplied their public key, we can combine them to create a master key
                    # The event will now be ready to receive votes on the various polls that have been defined -
                    # voters therefore need to be informed
                    if event.trustee_keys.count() == event.users_trustees.count():
                        generate_combpk.delay(event)
                        # TODO: Create Celery task that generates voting URLs for voters as well as creates the ballots

                    success_msg = 'You have successfully submitted your public key for this event'
                    messages.add_message(request, messages.SUCCESS, success_msg)

                    # This re-direct may not be appropriate for trustees that don't have logins
                    return HttpResponseRedirect(reverse("user_home"))
            else:
                form = EventSetupForm()
                return render(request, "polls/event_setup.html", {"event": event, "form": form})

    #if no key or is invalid?
    messages.add_message(request, messages.WARNING, 'You do not have permission to access: ' + request.path)
    return HttpResponseRedirect(reverse("user_home"))

def event_addec(request, event_id):
    event = get_object_or_404(Event, pk=event_id)
    for poll in event.polls.all():
        generate_enc.delay(poll)
    return HttpResponse("Generating enc.")

def event_trustee_decrypt(request, event_id):
    event = get_object_or_404(Event, pk=event_id)
    access_key = request.GET.get('key', None)
    if (access_key):
        email_key = event.keys.filter(key=access_key)
        if (email_key.exists() and event.users_trustees.filter(email=email_key[0].user.email).exists()):
            if (Decryption.objects.filter(event=event, user=email_key[0].user).exists()):
                messages.add_message(request, messages.WARNING, 'You have already provided your decryptions for this event')
                #if (event.decryptions.count() == (event.polls.count() * event.users_trustees.count())):
                #    tally_results.delay(event) # all keys are in
                return HttpResponseRedirect(reverse("user_home"))
            elif (request.method == "GET"):
                initial = []
                for poll in event.polls.all():
                    initial.append({'text': poll.enc })
                formset = DecryptionFormset(initial=initial)
            else:
                formset = DecryptionFormset(request.POST)
                data = []
                for form in formset:
                    if form.is_valid():
                        data.append(form.cleaned_data.get('text'))
                if (len(data) == event.polls.count()):
                    for dec, poll in zip(data, event.polls.all()):
                        Decryption.objects.get_or_create(user=email_key[0].user, event=event, poll=poll, text=dec)
                    messages.add_message(request, messages.SUCCESS, 'Decryption complete.')
                    if (event.decryptions.count() == (event.polls.count() * event.users_trustees.count())):
                        tally_results.delay(event) # all keys are in
                else:
                    messages.add_message(request, messages.ERROR, 'You didn\'t provide decryptions for every poll. Please try again.')
                return HttpResponseRedirect(reverse("user_home"))
            return render(request, "polls/event_decrypt.html", {"event": event, "formset": formset, "helper": DecryptionFormSetHelper() })

    messages.add_message(request, messages.WARNING, 'You do not have permission to decrypt this Event.')
    return HttpResponseRedirect(reverse("user_home"))

def test_poll_vote(request, poll_id):
    poll = get_object_or_404(Poll, pk=poll_id)
    form = VoteForm(instance=poll)
    return render(request, "polls/vote_poll.html", {"vote_form": form, "poll": poll})

def manage_questions(request, event_id):

    event = get_object_or_404(Event, pk=event_id)

    if (request.user.is_anonymous()) or (not event.users_organisers.filter(email=request.user.email).exists()):
        messages.add_message(request, messages.WARNING, 'You do not have permission to access: ' + request.path)
        return HttpResponseRedirect(reverse("user_home"))

    poll = Poll()
    formset = OptionFormset(instance=poll, prefix="formset_organiser")

    if request.method == "POST":
        form = PollForm(request.POST, prefix="main")
        formset = OptionFormset(request.POST, prefix="formset_organiser") # incase form fails, we still want to retain formset data
        if form.is_valid():
            poll = form.save(commit=False)
            poll.event_id = event_id
            poll.save()
            formset = OptionFormset(request.POST, prefix="formset_organiser", instance=poll)
            if formset.is_valid():
                formset.save()
                #create_ballots.delay(poll)
                messages.add_message(request, messages.SUCCESS, 'Poll created successfully')
                return HttpResponseRedirect(reverse('polls:event-polls', args=[poll.event_id]))

        return render(request, "polls/create_poll.html", {"event": event, "question_form": form, "option_formset": formset})

    elif request.method == "GET":
        form = PollForm(prefix="main") #, instance=poll
        return render(request, "polls/create_poll.html", {"event": event, "question_form": form, "option_formset": formset})
    else:
        return HttpResponseNotAllowed()

def render_invalid(request, events, demo_users, invalid_fields):
    return render(request,
                  "polls/create_event.html",
                  {
                      "G_R_SITE_KEY": settings.RECAPTCHA_PUBLIC_KEY,
                      "user_email": request.user.email,
                      "events": events,
                      "demo_users": demo_users,
                      "invalid_fields": invalid_fields
                  })

def create_event(request):
    # Obtain context data for the rendering of the html template and validation
    events = Event.objects.all()
    demo_users = DemoUser.objects.all()

    if request.method == "POST":
        '''Perform Google reCAPTCHA validation'''
        recaptcha_response = request.POST.get('g-recaptcha-response')
        url = 'https://www.google.com/recaptcha/api/siteverify'
        values = {
            'secret': settings.RECAPTCHA_PRIVATE_KEY,
            'response': recaptcha_response
        }
        data = urllib.urlencode(values)
        req = urllib2.Request(url, data)
        response = urllib2.urlopen(req)
        result = json.load(response)

        '''Perform form data validation'''
        adaptor = EventModelAdaptor(request.POST, request.user)
        form_data_valid = adaptor.isFormDataValid(events, demo_users)

        '''Process form data based on above results'''
        if result['success']:
            if form_data_valid:
                # Create the new event using the form data
                adaptor.extractData()
                new_event = adaptor.updateModel()

                # Update the EID to include the GP in its EID
                update_EID.delay(new_event)

                # Send an email to all trustees for event preparation
                trustees = new_event.users_trustees.all()
                email_trustees_prep.delay(trustees, new_event)

                adaptor.clear_data()

                return HttpResponseRedirect(reverse('polls:index'))
            else:
                invalid_fields = adaptor.getInvalidFormFields()
                adaptor.clear_data()
                return render_invalid(request, events, demo_users, invalid_fields)
        else:
            invalid_fields = adaptor.getInvalidFormFields()
            invalid_fields['recaptcha'] = {'error': 'The reCAPTCHA server validation failed, please try again.'}
            adaptor.clear_data()
            return render_invalid(request, events, demo_users, invalid_fields)

    elif request.method == "GET":
        # Render the template
        return render(request,
                      "polls/create_event.html",
                      {
                          "G_R_SITE_KEY": settings.RECAPTCHA_PUBLIC_KEY,
                          "user_email": request.user.email,
                          "events": events,
                          "demo_users": demo_users
                      })
    else:
        return HttpResponseNotAllowed()

def edit_event(request, event_id):
    event = get_object_or_404(Event, pk=event_id)
    if request.method == "GET":
        form = EventEditForm(instance=event, prefix="main")
        '''
        organiser_initial_data = [{'email': request.user.email}]
        trustee_initial_data = []
        for user in event.users_organisers.exclude(email=request.user.email):
            organiser_initial_data.append({'email': user.email})
        organiser_formset = OrganiserFormSet(prefix="formset_organiser", initial=organiser_initial_data)
        for trustee in event.users_trustees.all():
            trustee_initial_data.append({'email': trustee.email})
        trustee_formset = TrusteeFormSet(prefix="formset_trustee", initial=trustee_initial_data)
        '''
    elif request.method == "POST":
        form = EventEditForm(request.POST, instance=event, prefix="main")
        #trustee_formset = TrusteeFormSet(request.POST, prefix="formset_trustee")
        #organiser_formset = OrganiserFormSet(request.POST, prefix="formset_organiser") # incase form fails, we still want to retain formset data
        if form.is_valid():
            form.save()
            '''
            if organiser_formset.is_valid():
                event.users_organisers.clear()
                for oform in organiser_formset:
                    if (oform.cleaned_data.get('email')):
                        event.users_organisers.add(DemoUser.objects.get(email=oform.cleaned_data['email']))
                event.users_organisers.add(request.user) # always add editor/creator
                if trustee_formset.is_valid():
                    event.users_trustees.clear()
                    for tform in trustee_formset:
                        if (tform.cleaned_data.get('email')):
                            event.users_trustees.add(EmailUser.objects.get_or_create(email=tform.cleaned_data['email'])[0])
            '''
            return HttpResponseRedirect(reverse('polls:view-event', kwargs={'pk': event.id}))
    return render(request, "polls/generic_form.html", {"form_title": "Edit Event: " + event.title, "form": form}) #"organiser_formset": organiser_formset, "trustee_formset": trustee_formset})
        #trustee_formset = TrusteeFormSet(request.POST, prefix="formset_trustee", instance=event)

#class CreatePoll(generic.View):

def del_event(request, event_id):
    event = get_object_or_404(Event, pk=event_id)
    if request.method == "GET":
        return render(request, "polls/del_event.html", {"event_title": event.title, "event_id": event.id})
    elif request.method == "POST":
        event.delete()
        return HttpResponseRedirect(reverse('polls:index'))

def can_vote(user, event):
    if event.voters.filter(email=user.email).exists():
        return True
    return False