from django.conf import settings


def canonical_url_processor(request):
    if settings.DEBUG:
        canonical_url = request.build_absolute_uri()
    else:
        current_host = request.get_host()
        canonical_host = settings.CANONICAL_HOST

        if current_host != canonical_host:
            canonical_url = f"{request.scheme}://{canonical_host}{request.get_full_path()}"
        else:
            canonical_url = request.build_absolute_uri()

    return {'canonical_url': canonical_url}