from django.http import Http404
from django_scopes import scope

from scopedsites.models import Domain


class DomainScopeMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        d = Domain.get_from_request(request)  # technically does hit the db layer, but should get caught in memcache
        # TODO: performance testing

        with scope(domain=d):
            response = self.get_response(request)

            return response


class DomainAutoCreateMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
        self.cache = set()

    def ensure_exists(self, r):
        if (host := r.META.get("HTTP_HOST")) in self.cache:
            return

        try:
            Domain.get_from_request(r)
            self.cache.add(host)
        except Http404:
            Domain.objects.create(fqdn=r.META.get('HTTP_HOST'))

    def __call__(self, request):
        self.ensure_exists(request)
        return self.get_response(request)