import logging
import gobject

LOGGER = logging.getLogger("sugar.tutorius.dbustools")

def save_args(callable, *xargs, **xkwargs):
    def __call(*args, **kwargs):
        kw = dict()
        kw.update(kwargs)
        kw.update(xkwargs)
        return callable(*(xargs+args), **kw) 
    return __call

def ignore(*args):
    LOGGER.debug("Unhandled asynchronous dbus call response with arguments: %s", str(args))

def logError(error):
    LOGGER.error("Unhandled asynchronous dbus call error: %s", error)

def remote_call(callable, args, return_cb=None, error_cb=None, block=False):
    reply_cb = return_cb or ignore
    errhandler_cb = error_cb or logError
    if block:
        try:
            ret_val = callable(*args)
            LOGGER.debug("remote_call return arguments: %s", str(ret_val))
        except Exception, e:
            #Use the specified error handler even for blocking calls
            errhandler_cb(e)
            return

        #Return value signature might be :
        if ret_val is None:
            #Nothing
            return reply_cb()
        elif type(ret_val) in (list, tuple):
            #Several parameters
            return reply_cb(*ret_val)
        else:
            #One parameter
            return reply_cb(ret_val)
    else:
        callable(*args, reply_handler=reply_cb, error_handler=errhandler_cb)

class Future(object):
    def __init__(self):
        self._value = None

    def get(self):
        context = gobject.MainLoop().get_context()
        while self._value == None and context.iteration(True):
            pass
        return self._value

    def _set(self, value):
        self._value = value