# -*- coding: utf-8 -*-
import json

from django.core.urlresolvers import reverse_lazy
from django.db.models import Count
from django.views.generic import TemplateView, FormView
from django.http import HttpResponse
from django.shortcuts import redirect

from emencia.django.newsletter.forms import ContactForm
from emencia.django.newsletter.models import Contact, MailingList
from emencia.django.newsletter.forms import MailingSettingsForm
from accounts.views import GetUserMixin
from functions.http import JsonResponse
from city.models import City
from theme.models import Theme


class SubscribeView(GetUserMixin, FormView):
    """
    Представление для подписки не/авторизованных пользователей
    """
    template_name = 'client/newsletters/mailing_settings.html'
    form_class = MailingSettingsForm

    def get_object(self):
        return self.get_user()

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super(SubscribeView, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super(SubscribeView, self).post(request, *args, **kwargs)

    def form_valid(self, form):
        if self.request.POST.get('save'):
            contact = form.save()
            if not self.request.user.is_authenticated():
                contact.send_activation()

        if self.request.is_ajax():
            data = {'success': True}
            if self.request.POST.get('save'):
                data['redirect_url'] = str(self.get_success_url())
            return JsonResponse(data)

        return redirect(self.get_success_url())

    def form_invalid(self, form):
        if self.request.is_ajax():
            data = {
                'form_errors': form.errors,
            }
            return JsonResponse(data, status=400)
        return self.render_to_response(self.get_context_data(form=form))

    def get_initial(self):
        data = super(SubscribeView, self).get_initial()
        if self.request.GET.get('email'):
            data['email'] = self.request.GET['email']
        if self.request.GET.get('first_name'):
            data['first_name'] = self.request.GET['first_name']
        return data

    def get_form_kwargs(self):
        kwargs = super(SubscribeView, self).get_form_kwargs()
        if self.request.user.is_authenticated():
            kwargs.update({'instance': self.object})
        return kwargs

    def get_success_url(self):
        if not self.request.user.is_authenticated():
            return reverse_lazy('subscription_activation_send')
        return reverse_lazy('newsletter_subscription')

    def get_context_data(self, **kwargs):
        ctx = super(SubscribeView, self).get_context_data(**kwargs)
        ctx['object'] = self.object
        ctx['r_cities'] = self.get_russian_cities()
        ctx['checked_th'] = self.get_checked_th()
        ctx['popular_themes'] = self.get_popular_themes()

        if self.object is not None:
            if self.request.GET.get('unsibscribe') and self.object.subscriber:
                self.object.unsubscribe()
                ctx['unsubscribe_success'] = True
            elif not self.object.subscriber:
                ctx['unsubscribed'] = True

        return ctx

    def get_russian_cities(self):
        """
        :return: города России
        """
        return City.used.russia()

    def get_checked_th(self):
        """
        :return: выбранные пользователем темы
        """
        if self.object is not None:
            return self.object.themes.values_list('pk', flat=True)
        return []

    def get_popular_themes(self):
        """
        :return: 7 популярных тем (где больше всего подписчиков)
        """
        qs = Theme.objects.annotate(c=Count('contact'))\
                          .values('pk', 'c')\
                          .order_by('-c')[:7]
        return Theme.objects.language()\
                            .filter(pk__in=[x['pk'] for x in qs])\
                            .order_by('name')


class ActivationView(TemplateView):
    http_method_names = ['get']
    template_name = 'registration/activate.html'

    def get(self, request, *args, **kwargs):
        activated_contact = self.activate(request, *args, **kwargs)
        # add to announce list
        m = MailingList.objects.get(id=1)
        m.subscribers.add(activated_contact)
        if activated_contact:
            success_url = self.get_success_url(request, activated_contact)
            try:
                to, args, kwargs = success_url
                return redirect(to, *args, **kwargs)
            except ValueError:
                return redirect(success_url)
        return super(ActivationView, self).get(request, *args, **kwargs)

    def activate(self, request, activation_key):
        """
        Implement account-activation logic here.

        """
        activated_contact = Contact.objects.activate(activation_key)
        return activated_contact


    def get_success_url(self, request, user):
        return ('subscription_activation_complete', (), {})


def popup_validate(request):
    response = {'success': False}
    if request.GET:
        form = ContactForm(request.GET)
        if form.is_valid():
            contact = form.save()
            contact.send_activation()
            response['success'] = True
            response['redirect'] = True
            response['redirect_url'] = str(
                reverse_lazy('subscription_activation_send')
            )
        else:
            response['errors'] = form.errors

    return HttpResponse(json.dumps(response, indent=2), content_type='application/json')


def landing_partisipation_validate(request):
    response = {'success': False}
    if request.method == 'POST' and request.is_ajax():
        form = ContactForm(request.POST)
        if form.is_valid():
            contact = form.save()
            contact.send_activation()
            response['success'] = True
        else:
            response['errors'] = form.errors
    return HttpResponse(json.dumps(response), content_type='application/json')