_filters = []


def apply_filters(ctx_msg):
    filters = sorted(_filters, key=lambda x: x[0], reverse=True)
    for f in filters:
        r = f[1](ctx_msg)
        if r is False:
            return False
    return True


def add_filter(func, priority=10):
    _filters.append((priority, func))


def as_filter(priority=10):
    def decorator(func):
        add_filter(func, priority)
        return func

    return decorator