"""Cache of Site related settings

Site IDs and urlconfs are such that are testd on *all* requests thus they need
to be cached.

"""

from django.conf import settings
from django.contrib.sites.models import Site

_CACHE_SITE_IDS = None
_CACHE_URLCONFS_BY_DOMAIN = getattr(settings, 'MULTIDOMAIN_URLCONFS', dict())


def get_urlconf(domain=""):
    """Get urlconf (by domain, if omitted the global ROOT_URLCONF)"""
    return _CACHE_URLCONFS_BY_DOMAIN.get(domain, settings.ROOT_URLCONF)


def get_site_id(domain=""):
    """Get site ID (by domain, if omitted the global SITE_ID is fetched)"""
    refresh_multidomain_sites()
    return _CACHE_SITE_IDS.get(domain, settings.SITE_ID)


def get_site(domain=""):
    """Get current Site (by domain, if omitted the global site is fetched)
    
    .. note: Site *objects* are not cached, only site ids.
    
    """
    site_id = get_site_id(domain)
    if site_id == settings.SITE_ID:
        return Site.objects.get_current()
    return Site.objects.get(pk=site_id)


def refresh_multidomain_sites(forced=False):
    """Refresh the cache of site IDs
    
    :param forced: Force refresh
    
    """
    global _CACHE_SITE_IDS
    if not _CACHE_SITE_IDS or forced:
        _CACHE_SITE_IDS = {}
        for s in Site.objects.all():
            _CACHE_SITE_IDS[s.domain] = s.id