search_cache = get_cache('locmem:///')
_CACHE_TIMEOUT = 60*60*5 # 5 min

def search_cacheable(lang, query):
    key = urllib.quote(lang + query)
    if not search_cache.get(key):
        results4blogs = Entry.objects.all()
        results4pages = Page.objects.filter(language__exact=lang)
        results4photos = Photo.objects.all()
        results4comments = Comment.objects.all()
        for term in query.split():
            results4blogs = results4blogs.filter(Q(headline__icontains=term) | Q(body__icontains=term))
            results4pages = results4pages.filter(Q(title__icontains=term) | Q(content__icontains=term))
            results4photos = results4photos.filter(Q(title__icontains=term))
            results4comments = results4comments.filter(Q(headline__icontains=term) | Q(comment__icontains=term))

        rslt = list(set(results4blogs) | set(results4pages) | set(results4photos) | set(results4comments))
        search_cache.set(key, rslt, _CACHE_TIMEOUT)
        print 'cache created for "%s" in %s' % (query, lang.upper())
    else:
        rslt = search_cache.get(key)
        print 'cache hit for "%s" in %s' % (query, lang.upper())
    return rslt

def paginate_results(request):
    paginate_by = 5
    orphans = 1

    lang = request.LANGUAGE_CODE
    page = int(request.GET.get('page', '1'))
    query = urllib.unquote(request.GET.get('search_query', '')).lower()
    
    results = search_cacheable(lang, query)
    paginator = ObjectPaginator(results, paginate_by, orphans)
    
    try:
        collection = paginator.get_page(page - 1)
    except InvalidPage:
        raise Http404
    
    return render_to_response('results.html', 
                              {'results': collection,
                               'query':query,
                               'is_paginated': paginator.pages > 1,
                               'results_per_page': paginate_by,
                               'has_next': paginator.has_next_page(page - 1),
                               'has_previous': paginator.has_previous_page(page - 1),
                               'page': page,
                               'next': page + 1,
                               'previous': page - 1,
                               'pages': paginator.pages,
                               'hits' : paginator.hits,}, 
                               context_instance=RequestContext(request),)