from django.contrib import messages
from django.contrib.messages.views import SuccessMessageMixin
from django.contrib.auth import authenticate, login
from django.contrib.auth.decorators import permission_required
from django.contrib.auth.models import Group, User
from django.core.urlresolvers import reverse_lazy
from django.db.models import Prefetch
from django.shortcuts import render
from django.utils.crypto import get_random_string
from django.views.generic.edit import CreateView, UpdateView

from django_cas_ng.views import logout as cas_logout_view

from kfet.decorators import teamkfet_required

from .forms import GroupForm
from .models import GenericTeamToken


@teamkfet_required
def login_genericteam(request):
    # Check si besoin de déconnecter l'utilisateur de CAS
    cas_logout = None
    if request.user.profile.login_clipper:
        # Récupèration de la vue de déconnexion de CAS
        # Ici, car request sera modifié après
        next_page = request.META.get('HTTP_REFERER', None)
        cas_logout = cas_logout_view(request, next_page=next_page)

    # Authentification du compte générique
    token = GenericTeamToken.objects.create(token=get_random_string(50))
    user = authenticate(username="kfet_genericteam", token=token.token)
    login(request, user)

    messages.success(request, "Connecté en utilisateur partagé")

    return cas_logout or render(request, "kfet/login_genericteam.html")


@permission_required('kfet.manage_perms')
def account_group(request):
    user_pre = Prefetch(
        'user_set',
        queryset=User.objects.select_related('profile__account_kfet'),
    )
    groups = (
        Group.objects
        .filter(name__icontains='K-Fêt')
        .prefetch_related('permissions', user_pre)
    )
    return render(request, 'kfet/account_group.html', {
        'groups': groups,
    })


class AccountGroupCreate(SuccessMessageMixin, CreateView):
    model = Group
    template_name = 'kfet/account_group_form.html'
    form_class = GroupForm
    success_message = 'Nouveau groupe : %(name)s'
    success_url = reverse_lazy('kfet.account.group')


class AccountGroupUpdate(SuccessMessageMixin, UpdateView):
    queryset = Group.objects.filter(name__icontains='K-Fêt')
    template_name = 'kfet/account_group_form.html'
    form_class = GroupForm
    success_message = 'Groupe modifié : %(name)s'
    success_url = reverse_lazy('kfet.account.group')