from django.utils.decorators import method_decorator
from django.shortcuts import redirect
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.conf import settings

class SuperUserRequiredMixin:
    """
    View mixin which requires that the authenticated user is a super user
    (i.e. `is_superuser` is True).
    """

    @method_decorator(login_required)
    def dispatch(self, request, *args, **kwargs):
        if not request.user.is_superuser:
            messages.error(
                request,
                'You do not have the permission required to perform the '
                'requested operation.')
            return redirect(settings.LOGIN_URL)
        return super().dispatch(request, *args, **kwargs)


class LoginRequiredMixin:
    """
    View mixin which verifies that the user has authenticated.

    NOTE:
        This should be the left-most mixin of a view.
    """

    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        messages.info(self.request, "Um diese Seite anzuzeigen, musst du dich einloggen.")
        return super().dispatch(*args, **kwargs)