from django.contrib.auth.decorators import login_required
from django.core.exceptions import PermissionDenied
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.models import User
from django.contrib.auth.mixins import PermissionRequiredMixin
from django.contrib.auth.decorators import permission_required
from django.views.generic import ListView, DetailView, CreateView, UpdateView
from django.contrib.contenttypes.models import ContentType
from django.contrib import messages

from accounts.models import Profile
from accounts.forms import UserCreateForm, UserChangeForm, ProfileForm
#from banking.forms import PaymentForm

from .models import Adhesion, Corporation
from .forms import AdhesionForm


@login_required
def user(request):
    return render(request, 'adhesions/user.html', {
        'adherent': request.user,
        'adhesion': request.user.profile.adhesion,
    })

@login_required
def corporation(request, pk):
    corporation = get_object_or_404(Corporation, pk=pk)
    try:
        corporation.members.get(pk=request.user.pk)
    except User.DoesNotExist:
        raise PermissionDenied
    return render(request, 'adhesions/corporation.html', {
        'adherent': corporation,
        'adhesion': corporation.adhesion,
    })


class UserMixin(PermissionRequiredMixin):
    model = User
    permission_required = 'auth.change_user'


class UserList(UserMixin, ListView):
    template_name = 'adhesions/user_list.html'


class UserDetail(UserMixin, DetailView):
    template_name = 'adhesions/user_detail.html'


@permission_required('auth.change_user')
def user_edit(request, pk=None):
    if pk:
        user = get_object_or_404(User, pk=pk)
        user_form = UserChangeForm(request.POST or None, instance=user)
        profile = user.profile
    else:
        user = None
        user_form = UserCreateForm(request.POST or None)
        profile = None
    profile_form = ProfileForm(request.POST or None, instance=profile)
    forms = [user_form, profile_form]
    if not pk or not user.profile.adhesion:
        adhesion_form = AdhesionForm(request.POST or None)
        forms += [adhesion_form]
    else:
        adhesion_form = None
    if request.method == 'POST' and all([form.is_valid() for form in forms]):
        error = False
        if user: # update
            user_form.save()
            profile_form.save()
        else:
            user = user_form.save()
            # profile created by user post_save signal
            profile = Profile.objects.get(user__pk=user.pk)
            profile_form = ProfileForm(request.POST, instance=profile)
            if profile_form.is_valid():
                profile_form.save()
            else:
                # we need a new user form bind to user instance
                user_form = UserForm(request.POST or None, instance=user)
                forms[0] = user_form
                error = True
        if adhesion_form:
            if adhesion_form.is_valid():
                if adhesion_form.cleaned_data['adherent']:
                    Adhesion.objects.create(
                        adherent_type=ContentType.objects.get_for_model(User),
                        adherent_id=user.pk,
                    )
                    # TODO: contribution
            else:
                error = True
        if not error:
            messages.success(request, 'Utilisateur créé avec succès.')
            return redirect('user-detail', pk=user.pk)
        messages.warn(request, 'Utilisateur créé mais certaines informations du profil '
                               'n’ont pas été sauvegardé, veuillez les corriger.')
    return render(request, 'adhesions/user_form.html', {
        'forms': forms,
        'user': user,
    })


class CorporationMixin(PermissionRequiredMixin):
    model = Corporation
    permission_required = 'adhesions.change_corporation'


class CorporationList(CorporationMixin, ListView):
    pass


class CorporationDetail(CorporationMixin, DetailView):
    pass


class CorporationCreate(CorporationMixin, CreateView):
    fields = ('social_reason',)


class CorporationUpdate(CorporationMixin, UpdateView):
    fields = ('social_reason',)


class AdhesionMixin(PermissionRequiredMixin):
    model = Adhesion
    permission_required = 'adhesions.change_adhesion'


class AdhesionList(AdhesionMixin, ListView):
    pass


class AdhesionDetail(AdhesionMixin, DetailView):
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['show_adherent'] = True
        return context