from django.contrib import messages
from django.contrib.auth import get_user_model
from django.shortcuts import get_object_or_404
from django.urls import reverse, reverse_lazy
from django.utils.translation import gettext_lazy as _
from django.views.generic import DeleteView, TemplateView

from bds.autocomplete import bds_search
from bds.forms import ProfileForm, UserForm, UserFromClipperForm, UserFromScratchForm
from bds.mixins import MultipleFormView, StaffRequiredMixin
from bds.models import BDSProfile
from shared.views import AutocompleteView

User = get_user_model()


class BDSAutocompleteView(StaffRequiredMixin, AutocompleteView):
    template_name = "bds/search_results.html"
    search_composer = bds_search


class Home(StaffRequiredMixin, TemplateView):
    template_name = "bds/home.html"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["member_count"] = BDSProfile.objects.filter(is_member=True).count()
        return context


class UserUpdateView(StaffRequiredMixin, MultipleFormView):
    template_name = "bds/user_update.html"

    form_classes = {
        "user": UserForm,
        "profile": ProfileForm,
    }

    def dispatch(self, request, *args, **kwargs):
        self.user = get_object_or_404(User, pk=self.kwargs["pk"])
        return super().dispatch(request, *args, **kwargs)

    def get_user_instance(self):
        return self.user

    def get_profile_instance(self):
        return getattr(self.user, "bds", None)

    def get_success_url(self):
        return reverse("bds:user.update", args=(self.user.pk,))

    def form_valid(self, forms):
        user = forms["user"].save()
        profile = forms["profile"].save(commit=False)
        profile.user = user
        profile.save()
        messages.success(self.request, _("Profil mis à jour avec succès !"))

        return super().form_valid(forms)

    def form_invalid(self, forms):
        messages.error(self.request, _("Veuillez corriger les erreurs ci-dessous"))
        return super().form_invalid(forms)


class UserCreateView(StaffRequiredMixin, MultipleFormView):
    template_name = "bds/user_create.html"

    def get_form_classes(self):
        profile_class = ProfileForm

        if "clipper" in self.kwargs:
            user_class = UserFromClipperForm
        else:
            user_class = UserFromScratchForm

        return {"user": user_class, "profile": profile_class}

    def get_user_initial(self):
        if "clipper" in self.kwargs:
            clipper = self.kwargs["clipper"]
            email = self.request.GET.get("mail", "{}@clipper.ens.fr".format(clipper))
            fullname = self.request.GET.get("fullname", None)

            if fullname:
                # Heuristique : le premier mot est le prénom
                first_name = fullname.split()[0]
                last_name = " ".join(fullname.split()[1:])
            else:
                first_name = ""
                last_name = ""

            return {
                "username": clipper,
                "email": email,
                "first_name": first_name,
                "last_name": last_name,
            }
        else:
            return {}

    def get_success_url(self):
        return reverse("bds:user.update", args=(self.user.pk,))

    def form_valid(self, forms):
        # On redéfinit self.user pour get_success_url
        self.user = forms["user"].save()
        profile = forms["profile"].save(commit=False)
        profile.user = self.user
        profile.save()
        messages.success(self.request, _("Profil créé avec succès !"))

        return super().form_valid(forms)

    def form_invalid(self, forms):
        messages.error(self.request, _("Veuillez corriger les erreurs ci-dessous"))
        return super().form_invalid(forms)


class UserDeleteView(StaffRequiredMixin, DeleteView):
    model = User
    success_url = reverse_lazy("bds:home")
    success_message = "Profil supprimé avec succès !"

    def delete(self, request, *args, **kwargs):
        # SuccessMessageMixin does not work with DeleteView, see :
        # https://code.djangoproject.com/ticket/21926
        messages.success(request, self.success_message)

        return super().delete(request, *args, **kwargs)